EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 506/1 Article
Free access article

Issue A&A
Volume 506, Number 1, October IV 2009
The CoRoT space mission: early results
Page(s) 203 - 211
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361/200911871
Published online 15 June 2009

A&A 506, 203-211 (2009)
DOI: 10.1051/0004-6361/200911871

Improved fundamental parameters and LTE abundances of the CoRoT solar-type pulsator HD 49933

T. Ryabchikova1, 2, L. Fossati1, and D. Shulyak1

1  Institut für Astronomie, Universität Wien, Türkenschanzstrasse 17, 1180 Wien, Austria
    e-mail: [ryabchik;fossati]@astro.univie.ac.at;denis.shulyak@gmail.com
2  Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, 119017 Moscow, Russia
    e-mail: ryabchik@inasan.ru

Received 18 February 2009 / Accepted 7 May 2009

Abstract
Aims. The knowledge of accurate stellar parameters is a key stone in several fields of stellar astrophysics, such as asteroseismology and stellar evolution. Although the parameters can be derived both from spectroscopy and multicolour photometry, the results obtained are sometimes affected by systematic uncertainties. In this paper, we present a self-consistent spectral analysis of the solar-type star HD 49933, which is a primary target for the CoRoT satellite.
Methods. We used high-resolution and high signal-to-noise ratio spectra to carry out a consistent parameter estimation abundance analysis of HD 49933. The LLMODELS code was employed for model atmosphere calculations, while SYNTH3 and WIDTH9 codes were used for line profile calculation and LTE abundance analysis.
Results. We provide a detailed description of the methodology adopted to derive the fundamental parameters and the abundances. Although the parameters obtained differ from the ones previously derived by other authors, we show that only the set obtained in this work is able to fit the observed spectrum accurately. In particular, the surface gravity was adjusted to fit pressure-sensitive spectral features.
Conclusions. We confirm the importance of a consistent analysis of relevant spectroscopic features, application of advanced model atmospheres, and the use of up-to-date atomic line data for the determination of stellar parameters. These results are crucial for further studies, e.g., detailed theoretical modelling of the observed pulsation frequencies.


Key words: stars: abundances -- stars: fundamental parameters -- stars: individual: HD 49933



© ESO 2009


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.