Elemental abundance analyses with DAO spectrograms. XXXIX. The am stars 2 UMa and 15 Vul

No Thumbnail Available




Çay, İpek
Teker Yelkenci, Ayşegül
Adelman, Saul J.

Journal Title

Journal ISSN

Volume Title


Iop Publishing Ltd, Temple Circus, Temple Way, Bristol Bs1 6Be, England

Research Projects

Organizational Units

Journal Issue


We derived the elemental abundances of the metallic-line stars 2 UMa (=HR 3354; spectral type A2m) and 15 Vul (=HR 7653; spectral type A4 III), using high-dispersion, high signal-to-noise ratio (>= 200) optical region spectrograms obtained with CCD detectors at the long Coude camera of the 1.22 m telescope of the Dominion Astrophysical Observatory (DAO) and Kurucz's ATLAS9 and WIDTH9 programs. The star 2 UMa has not been the subject of a modern detailed elemental abundances analysis. It is relatively sharp-lined and sufficiently hot (T-eff = 8050 K) that the continuum placement is not a major problem in the optical region. Comparison of the results of this new study of 15 Vul with the last complete study shows a 0.15 dex mean increase in the derived abundances and a reduction in the standard deviations of the mean values. The abundance anomalies of 2 UMa are usually larger than those of 15 Vul. The greater spectral coverage of 15 Vul compared with 2 UMa results in a larger number of abundances being derived. The abundances of 2 UMa are typical for those of classical Am stars that have similar effective temperatures and surface gravities. 15 Vul, characterized by a similar effective temperature and smaller surface gravity, is a more evolved star.



Stars, Abundances, Stars, Chemically Peculiar