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2018•AIP conference proceedingsRequires access

The fundamental parameters of two a-type stars HD 2924 and HD 4321

Şeyma Çalışkan, A. Elmaslı, Yahya Nasolo

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Abstract

We present atmospheric parameters for HD 2924 and HD 4321: effective temperature, surface gravity, microturbulence, and metallicity. The spectra were obtained at the TÜBİTAK National Observatory using the Coudé echelle spectrograph attached to the 1.5 m telescope. The model atmospheres were calculated by using the ATLAS9 code. We derived Teff and log g values using excitation and ionization equilibrium of iron lines and by fitting Hβ profiles of LTE model spectra to the observed ones. The metallicities and microturbulence velocities were measured from equivalent widths of the iron lines in the observed spectra.

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What this paper is about

We present atmospheric parameters for HD 2924 and HD 4321: effective temperature, surface gravity, microturbulence, and metallicity. The spectra were obtained at the TÜBİTAK National Observatory using the Coudé echelle spectrograph attached to the 1.5 m telescope. The model atmospheres were calculated by using the ATLAS9 code. We derived Teff and log g values using excitation and ionization equilibrium of iron lines and by fitting Hβ profiles of LTE model spectra to the observed ones. The metallicities and microturbulence velocities were measured from equivalent widths of the iron lines in the observed spectra.

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Available abstract

We present atmospheric parameters for HD 2924 and HD 4321: effective temperature, surface gravity, microturbulence, and metallicity. The spectra were obtained at the TÜBİTAK National Observatory using the Coudé echelle spectrograph attached to the 1.5 m telescope. The model atmospheres were calculated by using the ATLAS9 code. We derived Teff and log g values using excitation and ionization equilibrium of iron lines and by fitting Hβ profiles of LTE model spectra to the observed ones. The metallicities and microturbulence velocities were measured from equivalent widths of the iron lines in the observed spectra.

Key concepts: Microturbulence, Physics, Astrophysics, Metallicity, Spectral line, Stars, Observatory, Spectrograph

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