Behaviour of OI triplet 7773 A. II - AP stars

Details Behaviour of OI triplet 7773 A. II - AP stars Behaviour of OI triplet 7773 A. II - AP stars

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26as...81..127g&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 81, no. 1, Nov. 1989, p. 127-150.

Astronomy and Astrophysics

Astrophysics

28

A Stars, Oxygen, Peculiar Stars, Abundance, Dwarf Stars, Spectral Line Width, Stellar Atmospheres, Thermodynamic Equilibrium

Scientific paper

The behavior of the O I triplet at 7773 A in a sample of 74 Ap stars is analyzed and compared with the results derived for a set of 50 normal stars. These abundance determinations are made in the NLTE frame by introducing a correction to the LTE model atmosphere. Among the Ap stars, the oxygen abundance varies greatly from one group to another and shows a clear separation between the different classes of peculiarities. An underabundance of up to a factor 400 is found for the (Sr-Cr-Eu) stars.

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