Monday, July 13. 2009
The business meeting of the Working Group on Ap and Related Stars will take place during the General Assembly of the IAU - in Rio de Janeiro on :
* ** Friday, the 7th of August, from 11h00 to 12h30.
If you are attending the GA, then please join us during this meeting!
If you are not attending the GA, you can still contribute to the meeting by sending me your input with regards to possible names for the Organizing Committee of the WG.
Two members of the Organizing Committee will have to be elected during this meeting. They will replace Werner Weiss and Barry Smalley who have served for three or more terms in the WG.
How can you contribute?
Please send a list of two or three names of people that you think should be part of the Organizing committee of the WG. You can either do that by replying to this comment, or by sending me an e-mail to mcunha@astro.up.pt.
The agenda of the Business meeting follows below.
Thanks !
Margarida
--------------------------------------------------------------------------------------------------------
Agenda for the Business Meeting of the WG on Ap and related Stars
1) Report and balance of the Activities during the period 2006 - 2009;
2) Proposal of Activities for the period 2009 - 2012;
3) Election of new members for the OC for the period 2009 - 2012;
4) Election of Chair and Vice-Chair for the period 2009 - 2012;
Wednesday, March 11. 2009
**** Deadline for abstract submission for the Joint Discussion ****
Progress in understanding the physics of Ap and related stars
Rio de Janeiro, Brazil, 3-5 August 2009
Dear Colleague,
We would like to call your attention to the DEADLINE for the ABSTRACT submission
**15th of March 2009**
for the Joint Discussion 'Progress in understanding the physics of Ap and related stars'. Also, the deadline for Early REGISTRATION is the 1st of May.
For instructions on how to register and submit your abstract, please check the IAU-GA Website http://www.astronomy2009.com.br/index.html.
I would also like to call your attention to the detailed scientific programme of the Joint Discussion, which is now available at the JD4 webpage : http://www.astro.up.pt/investigacao/conferencias/iau2009-ApStars/index.php?opt=main
My best regards,
Margarida
Wednesday, February 11. 2009
Dear all,
At each General Assembly, the International Astronomical Union has to determine the continuation or discontinuation of Commissions and Working Groups. Consequently, I intend to prepare a short letter emphasizing the role of the IAU-Working Group on Ap and related stars in bringing together a community with a diversity of expertise and scientific interests, and describing our plans for the next three years.
Although our working group exits beyond the IAU, discussing about the role it may play in the CP community is always a good exercise. Thus, I would like to take this opportunity to suggest that we share some ideas in this respect. Here are some questions to trigger the discussion:
1) What should be our plans for the next triennium (generally speaking, and in terms of specific activities)?
2) Should the WG play other roles besides promoting the reunion and information exchange between its members? If yes, which roles?
3) Is this forum of any use for those working on CP stars? How could it be improved?
Thanks in advance for your participation!
Margarida
Friday, January 30. 2009
Hello all,
I am a graduate student at the University of Delaware writing my PhD on observations of magnetic massive stars, more specifically Sigma Ori E (HD 37479, B2Vp He-strong star). Photometry was taken in the 1970's, and from literature it appears not again until 2004. Thus, I am wondering if there are data out there of this star that were taken, but not reported in that time period from 1980-2000. We are trying to measure whether the period of this star has changed since the initial measurements in the 70's, however it is difficult to discern without any data in those two decades. If you have any data (photometric or otherwise) that was unpublished of HD 37479, please contact me at meo at udel dot edu.
Thank you,
Mary Oksala
Friday, November 14. 2008
Dear Colleagues,
This is a First Announcement of the Joint Discussion:
**Progress in understanding the physics of Ap and related stars**
Rio de Janeiro, Brazil, 3-5 August 2009
Key words
---------
Stellar: pulsations, convection, rotation, diffusion and magnetism.
Motivation
----------
Chemically Peculiar (CP) stars are stage to a diversity of physical phenomena, such as pulsations, convection, rotation, accretion, diffusion or magnetism. As a consequence, they offer unique and colorful laboratory for examining and studying these phenomena simultaneously, competitively and in parallel, ultimately enriching the whole gamut of stellar physics.
During this Joint Discussion many new results from high-quality data of CP stars and sophisticated theoretical models will be presented. The techniques used to infer the data, and the ingredients of the models with which the data is compared will be discussed. Future challenges, expected in the context of new ground-based instrumentation, and of space missions recently launched or in preparation, will give the final tone to the Joint Discussion.
Scientific Organizing Committee
-------------------------------
Margarida Cunha (Portugal)
Natalia Drake (Russia)
Mike Dworetsky (UK)
Oleg Kochukhov (Sweden)
Friedrich Kupka (Germany)
Francis Leblanc (Canada)
Lyudmila Mashonkina (Russia)
Richard Monier (France)
Ernst Paunzen (Austria)
Nikolai Piskunov (Sweden)
Hiromoto Shibahashi (Japan)
Barry Smalley (UK)
Werner Weiss (Austria)
Jozef Ziznovsky (Slovakia)
The Joint Discussion will take place during the ** XXVII IAU General Assembly** and is organized by the IAU Working Group on Ap and Related Stars and coordinated by IAU Division IV, Stars. With the participation of Division V (Variable Stars) and Commissions 14 (Atomic and Molecular Data), 27 (Variable Stars), 29 (Stellar Spectra), 35 (Stellar Constitution) and 36 (Theory of Stellar Atmospheres).
Invited Speakers
----------------
Saul Aldman (The Citadel, USA)
John Lanstreet (University of Western Ontario, Canada)
Lyudmila Mashonkina (Institute of Astronomy, Moscow, Russia)
Jaymie Matthews (University of British Columbia, Canada)
Georges Michaud (Universite de Montreal, Canada)
David Moss (tbc) (University of Manchester, UK)
Tanya Ryabchikova (Institute of Astronomy, Moscow, Russia)
Denis Shulyak (University of Vienna, Austria)
Gregg Wade (Royal Military College of Canada)
Werner Weiss (University of Vienna , Austria)
Jean-Paul Zahn (Observatoire Paris, France)
Scientific Programme
--------------------
The meeting will be organized in three sessions, each including invited talks, oral Contributions and a discussion.
Session 1 - Pushing the limit of instrument capabilities
Session 2 - A 3-D look into the atmosphere?
Session 3 - CP and related phenomena in the context of Stellar Evolution
For the detailed scientific programme and additional information on this Joint Discussion, please have a look at the Joint Discussion page
If you would like to receive future announcements of this Joint Discussion please follow this link
Best regards,
Margarida Cunha
Wednesday, September 3. 2008
Applications are invited for a Postdoctoral Research Position at the Institute
of Astronomy and Astrophysics (IAA) of the Universite libre de Bruxelles,
Belgium.
We are looking for candidates having a good background in radiative transfer in
stellar atmospheres, preferably with expertise in non-LTE and/or
three-dimensional radiative hydrodynamical modeling.
The successful candidate will participate in a research project entitled "Heavy
elements in the universe: stellar evolution, nucleosynthesis and abundance
determinations". This research group involves a dozen researchers, with a broad
but coherent range of expertise, including derivation of surface abundances in low-
and solar-metallicity cool stars - studied through high-resolution spectroscopy
and dedicated model atmospheres - as well as nuclear astrophysics,
nucleosynthesis, stellar evolution, mixing processes and hydrodynamical modeling.
The team has a priviledged access to the HERMES high-resolution spectrograph
(first light: early 2009).
Within the team, the successful candidate will pursue a research program
aiming at understanding abundance patterns in stars with peculiar abundances.
Depending on the candidate's expertise, his research will focus on one or more
stellar classes among the following: low- and solar-metallicity cool stars
(Miras, S and C stars, carbon-enriched metal-poor stars), as well as Ap stars.
This ambitious research program will require the use and/or development of
efficient tools (non-LTE, dynamical atmospheres, stratified atmospheres).
The position is available from october 2008 on and is for 2 years initially,
with the possibility of extension to a third year.
Further information is available from:
Alain Jorissen: ajorisse@astro.ulb.ac.be
Sophie Van Eck: svaneck@astro.ulb.ac.be
Institut d'Astronomie et d'Astrophysique (IAA): http://www.astro.ulb.ac.be/
IAA Staff: http://www.astro.ulb.ac.be/Html/staff.html
HERMES spectrograph: http://hermes.ster.kuleuven.ac.be/
Universite Libre de Bruxelles: http://www.ulb.ac.be/
Interested applicants should send (by electronic or regular mail) a curriculum
vitae, a list of publications, a one-page maximum statement of research
interests and contact information for three references to:
Alain Jorissen
ajorisse@astro.ulb.ac.be
Institut d'Astronomie et d'Astrophysique
Universite libre de Bruxelles
Campus Plaine C.P. 226
Boulevard du Triomphe
B-1050 Bruxelles
Belgium
Applications will be considered until the position is filled. All applications
received by Sept. 30th, 2008 will receive equal consideration.
Monday, July 21. 2008
Dear all,
It is my pleasure to inform you that our proposal for a Joint Discussion on the ' Progress in understanding the Physics of Ap and related stars' has been approved and will take place during the next IAU General Assembly in Rio de Janeiro, in August 2009.
A webpage for the JD has been set up. Please have a look at it at:
http://www.astro.up.pt/investigacao/conferencias/iau2009-ApStars
The information on the webpage will be updated as the details of the workshop are organized.
Once more, thank you all for your cooperation.
Best wishes,
Margarida
Saturday, May 31. 2008
Dear colleagues,
I am about to close the 'first issue' of the 'Wish list for Atomic and Molecular data'. So far we had the following 'requests' (please, see comments to my first entrance on this subject -- on October 26.2007 -- for the details).
1) A new analysis of Xe II for wavelengths, and better transition probabilities for transitions in the 3500-4800 A wavelength range;
2) Improvement in the wavelengths of iron peak elements, in particular for CrI and CrII;
3) More lines of rare earths elements, for model calculations;
4) Better data in the red and infrared;
5) Improvements in the gf values of Cr II, especially those lines near H-beta. Recent work has improved the values of two lines of multiplet 30 and it would be nice to have better values for the rest of these lines.
6) Oscillator strengths and classifications are lacking for a number of lines found in the Re II spectrum of the star HD 65949 (between 3731 and 4904 AA). Also, of fourteen lines attributed wholly or partially to Os II in the same star, only one has an entry in the VALD database. There are no Te II lines in the VALD database. Also, f-values are lacking for lines of Ru II in the visible.
If you want to add any requests to this list before I write a brief document to send to the president of the Commission on Atomic and Molecular data, please send your requests before June 16, 2008. If possible, use this forum to make your requests. If you cannot do so, you can write to me on mcunha@astro.up.pt.
Best wishes,
Margarida
Friday, May 30. 2008
Dear Colleagues,
It is time to write the triennial report of the working group. The report will appear in the Transactions of the IAU 2006-2009.
In the manuscript we are asked to report over the period September 2006 - June 2008, and project our activities over the period June 2008 - August 2009. Also, our views about the future developments in the field of the WG, and the role WG therein, will be a very important item of the report.
DEAD LINE TO SEND YOUR INFORMATION : 10th of June 2008
HOW TO SEND YOUR INFORMATION : use the 'comments' entrance to respond to my message. Then add a comment with your information. If that fails, you can send an e-mail to me at mcunha@astro.up.pt
INFORMATION REQUESTED
Here is the kind of information that I would like from you (please feel free to send any additional information that you may find relevant for the report)
1) Any meetings, workshops, etc (besides the Vienna CP star meeting last year) related to the field of CP stars, that took or will take place during the period Sept 2006 - Jun 2009;
2) Instruments relevant to the field that became available or will become available during the same period. You can also add their importance to the future development of the field (3 or 4 of lines);
3) Instruments relevant to the field that having become available prior to Sept 2006, have played a major role in the highlight of this research field during the period considered;
4) Major scientific results published in the period from Sep 2006 to date. Please include a brief (two or three lines) description of the result, references, and, when applicable, mention the instruments/techniques that allowed for the new discoveries/results.
Thanks in advance for your cooperation.
Best wishes,
Margarida
Tuesday, November 13. 2007
The Proceedings of last year's meeting "Physics of Magnetic Stars" are now ready, and available for public access at:
http://w0.sao.ru/Doc-en/Science/Public/Conf/
The proceedings booklet contains 40 papers presented at the conference, All participants will get paper copy of this book.
Friday, October 26. 2007
Dear all,
During the CP#AP workshop in Vienna, it has been suggested that a 'Wish List' concerning needed atomic and related data, should be collected by the community.
With this entry, I would like to ask all of you with interest in this issue, to share, via this forum, your own 'requests', i.e., to let us know what additional data would you like to see provided by the community working on Atomic data.
At the end of the discussion, if enough material is collected, I shall prepare the 'Wish List' based on your contributions and send it to the president of commission 14.
Thank you in advance for your collaboration.
Margarida
Dear all,
As many of you may remember, during the AP#CP workshop in Vienna, last September, we have discussed the proposal for a Joint Discussion that we hope can be approved by the IAU, to be held during the next IAU General Assembly, in Rio, 2009. As agreed, the proposal was submitted to the IAU, in response to the call issued for letters of intent, with the deadline of September, 15. You can download the proposal at:
http://www.astro.up.pt/~mcunha/documents.
The deadline for submitting the final version of the proposal is December, 1st. If you have additional comments/suggestions to its format and/or content, please let me know.
Suggestions already received, which shall be implemented, concern:
1) A stronger highlight of rotation, in the scientific rational;
2) A stronger highlight of atomic data, in the actual programme.
Thank you in advance for your interest.
Best wishes,
Margarida
Tuesday, April 10. 2007
CP#AP Workshop 2007
10-14 September 2007
Institute for Astronomy
University of Vienna
Vienna, Austria
http://www.univie.ac.at/cpworkshop2007/
Call for registration
During the pre-registration phase we received a lot of positive
feedback, we therefore want to invite you to participate at the
forthcoming workshop. We are also strongly encourage the
attendance and presentation of young researchers.
Fortunately, there are many researchers, spread all over the world,
who are active in this research field. Stellar astrophysics is not
dead. In contrary, new theoretical as well as observational efforts
strongly support our community.
The workshop should serve as a platform to present new results but
also to discuss the construction/reactivation of a powerful
international working group. We therefore encourage the community to
allocate topics of conversation in this regard.
We are looking forward to a constructive and enlightening workshop.
Scientific Organizing Committee
Stefano Bagnulo, Fiorella Castelli, Mike Dworetsky, Ilian Kh. Iliev,
Oleg Kochukhov, John Landstreet, Hans M. Maitzen, Gautier Mathys, Georges
Michaud, Tanya Ryabchikova, Martin Stift, Gregg Wade, Werner Weiss, Jozef
Ziznovsky
Local Organizing Committee
Maria L. Alvear, Hubert Baum, Gerald Handler, Theresa Lüftinger,
Hans M. Maitzen, Nicole Nesvacil, Martin Netopil (Co-Chair), Marlene
Obbrugger, Ernst Paunzen (Chair), Monika Rode-Paunzen, Werner W. Weiss,
Konstanze Zwintz
Ernst Paunzen
Institute for Astronomy, University of Vienna
Türkenschanzstr. 17
A-1180 Vienna, Austria
email: ernst.paunzen@univie.ac.at
===============================================================================
SCIENTIFIC PROGRAMME
Workshop Agenda includes the following sessions (preliminary)
- Stellar atmospheres of CP#AP stars
- CP#AP stars in open clusters
- Evolutionary status
- Calibration of fundamental parameters
- (Non)-magnetic fields
- CP#AP stars from Space
- Theoretical insights
- CP#AP stars - reviews and overviews
Contributed papers and posters are solicited. Authors will be
notified whether their contribution is scheduled.
CONTRIBUTED PAPERS AND PROCEEDINGS
It is the aim of the workshop organizers to give every participant the
opportunity to present their work in the form of an oral presentation,
if possible. Space for poster presentations has been allocated.
The proceedings will be published as separate issue of the Contributions
of the Astronomical Observatory Skalnaté Pleso. Details on the
format and submission date of the contributions will be given later.
REGISTRATION
The registration is now open until the 31 June 2007 and can be done via
the form
http://www.univie.ac.at/cpworkshop2007/final_reg.html
Later registrations, if there are still free places, will be accepted.
REGISTRATION FEE
The registration fee is 100 Euro until the end of the final registration
deadline (31 June 2007). After that, 120 Euros (if there are still free
places) will be charged. Your registration is fixed with receipt of
the conference fee. Additional donation is welcome, which will be used
as grants for students among the participants.
The registration fee includes one printed copy of the conferences
proceedings, a welcome reception on the first evening, a "typical
Viennese" social event dinner and all refreshments during the coffee
breaks.
The registration fee should be paid to the following account:
Österreichische Verkehrskreditbank
Dr. Ernst Paunzen
BIC (SWIFT): OVERATWW
IBAN: AT081819049090000000
You have also the possibility to pay using Paypal
(Account: Ernst.Paunzen@univie.ac.at)
Since the money transaction fees in some countries are rather high
compared to the conference fee, there is also the possibility to pay
in cash at the registration desk in Vienna as last resort. (For all EU
countries the fees should be the same as for domestic bank transfers.)
Please indicate the method of payment in the registration form.
LOCATION AND VENUE
The conference will be held at the main lecture room of the Institute
of Astronomy, University of Vienna. We have collected several interesting
links
http://www.univie.ac.at/cpworkshop2007/venue.html
HOTEL INFORMATION
Rooms have been reserved in a number of hotels of different category at
special rates. Details about the hotels and hotel booking instructions
are provided in
. http://www.univie.ac.at/cpworkshop2007/accommodation.html
The hotels are reserved until Mid May. In case of problems or questions,
please contact us.
Tuesday, March 20. 2007
Hi Everyone,
We are looking for a high-resolution, wide wavelength coverage observation of 21 Peg (HD 209459). We use this star extensively as a standard for abundance analyses and to derive astrophysical oscillator strengths. Unfortunately, its spectra in Elodie archive are of too low quality for precise spectroscopic work, and we couldn't find any other observations.
Thanks in advance for any help or hints!
Thursday, March 15. 2007
Does anyone have low/medium resolution spectra of alpha Cir in the visible, calibrated in flux?
I have a master student that would like to have such data to use in her work, but she could only find one spectra, calibrated in flux, for alpha Cir in archive data. If you have that kind of data and do not mind her to use it, please let us know.
Cheers!
Monday, February 12. 2007
Dear colleagues,
The progress in helio- and asteroseismology as well as
in the theory of hydromagnetic instabilities led to the
idea of a conference on the connections between flows
and fields. The fifth in a series of Potsdam ThinkShops
will be dedicated to "Meridional flow, differential
rotation, solar and stellar activity" and takes place
in the
Astrophysical Institute Potsdam (AIP),
on June 24-29, 2007,
http://www.aip.de/thinkshop5/
A sequence of sessions is drafted below. If you are
interested, we would like to encourage you to register
for the Thinkshop at
http://www.aip.de/thinkshop5/registration.html
The following list of topics gives plenty of oppor-
tunities for discussing observational results versus
theoretical models:
Session 1: Solar flow pattern
: helioseismology
: photospheric flows and fields
: convection simulations
Session 2: Solar tachocline
: geometry
: stability
: mixing
Session 3: Stellar differential rotation and meridional flow
: photometry
: spectroscopy
: modeling
Session 4: Magnetic stability problems
: flux-tube dynamics
: magnetorotational instability
: current-driven instabilities
Session 5: Ap stars
: magnetic field configurations
: element distribution
: evolution to Ap stars
Session 6: Solar and stellar activity
: spots
: flip-flops
: cycle statistics
Session 7: Dynamo theory
: simulations
: flux transport
: activity forecast
We are looking forward seeing you at the 5th Potsdam
ThinkShop in June.
On behalf of the SOC and the LOC,
Sincerely,
Guenther Ruediger
Klaus G. Strassmeier
Alexander Kosovichev
Friday, February 2. 2007
There are still a few places available for the Non-LTE Workshop in Nice.
See the thread posted by Richard Monier on Thursday, January 25. 2007
Friday, January 26. 2007
On the right panel there is a place where all the existing categories are listed (above the big GO! button).
We have created a category called Announcements.
All the announcements will belong to this category.
To see all the announcements just click on the category.
We have also removed the specific page related to the announcements to keep only the category.
Thursday, January 25. 2007
A workshop entitled, "Non-LTE line formation for trace elements in stellar atmospheres" will take place in Nice (France) from 30 July to 04
August 2007.
This workshop/school is intended to provide a gentle and progressive introduction to semi-consistent Non-LTE modelling of
stellar atmospheres (ie. based on an underlying LTE model atmosphere). Lectures will be given in the mornings and practical exercises using current NLTE codes
will be carried out on computers in the afternoon. Lectures will address a general introduction to Non-LTE, microscopic processes, atomic data and the Non-LTE analysis of stellar spectra.
A detailed programme can be found at:
http://www.graal.univ-montp2.fr/workshop/accueil.html
where an application form is also available.
The number of participants is limited to about 30 and deadline for registration is 28 February 2007.
Best wishes,
Richard Monier, Chair
Tuesday, January 23. 2007
With the new ApN format, we no longer accepted submission of abstracts. Rather, you must cause your article to appear on the NASA ADS, using 1 of three routes:
1. Your article is accepted and published by a journal or conference proceeding. In that case, it should be automatically added to the ADS. Of course, this requires that you wait until publication.
2. Your article is accepted, and you submit it to the Arxiv astro-ph server. It will then be automatically added to the ADS after a day or two. THIS IS THE PRINCIPAL ROUTE FOR APN SUBSCRIBERS TO SUBMIT ABSTRACTS BEFORE PUBLICATION.
3. Your article is not part of a journal or proceedings that will be included in ADS, and cannot be added to astro-ph. In that case, you can still submit the title, authors and abstract to ADS. WE FORESEE THIS AS THE PRINCIPAL MECHANISM FOR SUBMITTING THESIS ABSTRACTS.
Stay tuned for additional "How To" posts.
I am writing a paper on HD 101065, and I need to establish its effective temperature with the best possible precision. Is there anybody out there who can help me?
Monday, January 22. 2007
The two links called "Related papers of the last N months" (below on the left) open an ADS page.
This ADS page is the result of a search, in abstracts of published papers, with selected keywords, related to Ap stars.
The keywords and the ADS settings used for this search are shown clicking on the link "Paper search info" (below on the left)
If you have any comment or suggestion concerning this feature of the web page, please comment to this thread.
Please use this thread to experiment and comment the new version of A peculiar Newsletter.
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