Improved fundamental parameters and LTE abundances of the CoRoT solar-type pulsator HD49933 - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




Improved fundamental parameters and LTE abundances of the CoRoT solar-type pulsator HD49933 - Astrophysics > Solar and Stellar Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: The knowledge of accurate stellar parameters is a key stone in several fieldsof stellar astrophysics, such as asteroseismology and stellar evolution.Although the parameters can be derived both via spectroscopy and multicolorphotometry, the obtained results are sometimes affected by systematicuncertainties. In this paper we present a self-consistent spectral analysis ofthe solar-type star HD49933, which is a primary target for the CoRoT satellite.We used high-resolution and high signal-to-noise ratio spectra to carry out aconsistent parameter estimation and abundance analysis of HD49933. The LLmodelscode was employed for model atmosphere calculations, while Synth3 and Width9codes were used for line profile calculation and LTE abundance analysis. Inthis paper we provide a detailed description of the methodology adopted toderive the fundamental parameters and the abundances. Although the obtainedparameters differ from the ones previously derived by other authors, we showthat only the set obtained in this work is able to fit the observed spectrumaccurately. In particular, the surface gravity was adjusted to fitpressure-sensitive spectral features. We confirm the importance of a consistentanalysis of relevant spectroscopic features, application of advanced modelatmospheres, and the use of up-to-date atomic line data for the determinationof stellar parameters. These results are crucial for further studies, e.g.detailed theoretical modelling of the observed pulsation frequencies.



Author: T. Ryabchikova 1 and 2, L. Fossati 1, D. Shulyak 1 1 Institute of Astronomy, Vienna University, Austria, 2 Institute of Astronomy

Source: https://arxiv.org/







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