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B-type supergiants in M 31
Published online by Cambridge University Press: 26 May 2016
Abstract
We present the spatial distribution of chemical species in M 31, as derived from intermediate resolution spectra of seven B-type supergiants, lying within four OB associations, covering a galactocentric distance of 5 – 12 kpc. We do not detect any systematic oxygen gradient across this galactocentric range. We find that the inner regions of M 31 are not, as previously thought, very ‘metal-rich’. Our abundances of C, N, O, Mg, Si, Al, S and Fe in the M 31 supergiants are very similar to those of massive stars in the solar neighbourhood.
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- Part 1. Atmospheres of Massive Stars
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- Copyright © Astronomical Society of the Pacific 2003