Chemical composition of B-type supergiants in the OB 8, OB 10, OB 48, OB 78 associations of M 31

  title={Chemical composition of B-type supergiants in the OB 8, OB 10, OB 48, OB 78 associations of M 31},
  author={Carrie Trundle and P. L. Dufton and Daniel Lennon and Steven J. Smartt and M. A. Urbaneja The Department of Pure and A. J. Coates Physics and The Queen's University of Belfast and Northern Ireland and The Isaac Newton Group of Telescopes and Santa Cruz de la Palma and Spain. and Institute of Radio Astronomy and University of Cambridge and Cambridge and UK. and I. Dominguez Cerdena Instituto de Astrofisica de Canarias and Tenerife},
  journal={Astronomy and Astrophysics},
Absolute and dierential chemical abundances are presented for the largest group of massive stars in M 31 studied to date. These results were derived from intermediate resolution spectra of seven B-type supergiants, lying within four OB asso- ciations covering a galactocentric distance of 5 12 kpc. The results are mainly based on an LTE analysis, and we additionally present a full non-LTE, unified model atmosphere analysis of one star (OB 78-277) to demonstrate the reliability of the dier… Expand
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