Atmospheric abundances of classical metallic-line A stars - The visual spectral region

Details Atmospheric abundances of classical metallic-line A stars - The visual spectral region Atmospheric abundances of classical metallic-line A stars - The visual spectral region

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apjs...65..137l&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 65, Sept. 1987, p. 137-160. Research supported by the University

Astronomy and Astrophysics

Astrophysics

27

A Stars, Metallic Stars, Stellar Atmospheres, Stellar Composition, Visible Spectrum, Abundance, Line Spectra, Stellar Gravitation, Stellar Temperature, Tables (Data)

Scientific paper

Line-blanketed model atmospheres, with effective temperatures and surface gravities determined from ultraviolet and visual energy distributions, are used to derive abundances of 25 elements for six classical metallic-line A stars and three control stars. Each spectral line is examined for blending by spectral synthesis, and the equivalent widths of the uncontaminated lines are analyzed with critically evaluated oscillator strengths. The neutral and ionized species of several elements give different abundances, an effect that is attributed to departures from LTE ionization balance. The microturbulent velocities range from 3 to 4 km/s, compared with about 2 km/s for the standard stars. Calcium and scandium are systematically deficient, and the elements heavier than zinc are enhanced by up to about 1.0 dex compared with the standards. Iron-peak elements are not enhanced and do not exhibit a trend of increased abundance with increasing T(eff).

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