Elemental abundance analysis with DAO spectrograms. XIII. The superficially normal early A-type stars 68 Tauri, 21 Lyncis and Alpha Draconis.
Abstract
Elemental abundances of three superficially normal, moderately sharp-lined early A stars, 68 Tau, 21 Lyn and a Dra, are derived consistently with previous studies of this series, using co-added photographic spectrograms supplemented by Reticon exposures. The first two stars are hot Am stars, while the third is slightly metal-poor. 68 Tau is relatively metal-rich compared to the Sun, with its abundance anomalies tending to increase with atomic number. The abundances of 21 Lyn are similar to those of a Dra for the light elements. its derived abundance anomalies increase with atomic number for the heavy elements. Key words: stars: abundances - stars: individual: 68 Tau - stars: individual: 21 Lyn - stars: individual - a Dra.
- Publication:
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Monthly Notices of the Royal Astronomical Society
- Pub Date:
- November 1994
- DOI:
- 10.1093/mnras/271.2.355
- Bibcode:
- 1994MNRAS.271..355A
- Keywords:
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- A Stars: Element Abundances