Compositional Differences among the A-Type Stars - Part One - Six Narrowlined Stars

Details Compositional Differences among the A-Type Stars - Part One - Six Narrowlined Stars Compositional Differences among the A-Type Stars - Part One - Six Narrowlined Stars

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276..142h&link_type=abstract

Astronomy and Astrophysics, Vol.276, NO. 1/SEPI, P. 142, 1993

Astronomy and Astrophysics

Astrophysics

54

Stars: Abundances - Stars: Chemically Peculiar - Stars: Individual: Sirius - Stars: Individual: Ο Peg

Scientific paper

We have determined abundances of up to 18 chemical elements using spectrum synthesis for half a dozen narrow-lined A-type stars. Except for Sirius (a hot Am star) and perhaps ο Peg all are classified as normal. Our results agree fairly well with those in the literature obtained using more traditional techniques. Considerable star-to-star abundance variations are present, even among the apparently normal stars. The abundance of iron varies over a range of about 0.7 dex and the abundances of most elements seem to vary at least roughly with those of iron. Our results are consistent with an approximately constant helium underabundance with respect to the Sun for all six stars; carbon exhibits an anti-correlation with iron.

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