Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326..763s&link_type=abstract
Astronomy and Astrophysics, v.326, p.763-779
Astronomy and Astrophysics
Astrophysics
23
B-Stars, Supergiants, Abundances, The Galaxy: Centre
Scientific paper
High resolution optical spectra of four blue supergiants (HD 148422 B0.5Ib; HD 178487 B0.5Ib; HD 179407 B1Ib, HD 163522 B1Ib) which lie within 4.5kpc of the Galactic centre are presented. Careful differential LTE model atmosphere analyses are used to quantify the differences in photospheric metal abundances between these stars and MK spectral standards in the solar neighborhood. A detailed non-LTE model atmosphere analysis of one star (HD 163522) confirms that the LTE differential abundances should be reliable, provided we use a comparison star with similar atmospheric parameters. One star (HD 148422; R_g_=4.5kpc) has a chemical composition similar to normal nearby B-type stars while HD 178487 (R_g_=4.1kpc) shows a mild but consistent pattern of a metal enhanced atmosphere (with elements up by 0.1-0.3dex). The other two stars HD 163522 (R_g_=4.1kpc) and HD 179407 (R_g_=3.5kpc) have significantly higher metal compositions than their standard comparison stars with abundances enhanced by 0.30-0.40dex and 0.20-0.5dex respectively. All of the stars lie outside the Galactic plane (with distances in the range 0.5
Dufton Philip L.
Lennon Daniel J.
Smartt Stephen J.
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