The effect of a readily ionized element on stellar atmospheres

Details The effect of a readily ionized element on stellar atmospheres The effect of a readily ionized element on stellar atmospheres

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982afz....18..423l&link_type=abstract

(Astrofizika, vol. 18, July-Sept. 1982, p. 423-438) Astrophysics (ISSN 0571-7132), vol. 18, no. 3, Jan. 1983, p. 257-266. Transl

Astronomy and Astrophysics

Astrophysics

1

Abundance, Ionization Potentials, Peculiar Stars, Stellar Atmospheres, Stellar Models, A Stars, Absorption Spectra, Chemical Composition, Line Spectra, Silicon, Stellar Temperature

Scientific paper

The influence of an increased abundance of elements with low ionization potentials on the atmospheres of stars is investigated. Theoretical model atmospheres are calculated in the temperature range of 7000-14,000 K for stars with a normal chemical composition and with an increased abundance of a readily ionized element, which is taken to be silicon. It is found that the dependences Te-(B-V) are different for the normal and the enhanced silicon models. Thus, the determination of Te for these enhanced silicon stars of the class A from the dependence Te-(B-V) obtained for normal stars may lead to an underestimation of T for cold and hot Ap stars and an overestimation of it for Ap stars of intermediate spectral classes. It is determined that the distribution of the parameters which characterize the atmosphere with the optical depth for the enhanced silicon models differs from their distribution for the corresponding normal models. These differences are shown to be due to changes in the absorption coefficient in the continuum. It is concluded that the spectral anomalies often observed in the spectra of stars of the spectral classes of B7-FO could be due to a silicon abundance enhanced by two or three orders of magnitude.

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