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A&A 419, 713-723 (2004)
DOI: 10.1051/0004-6361:20034560
A chemical analysis of five hot stars towards the Galactic centre
K. E. Munn1, P. L. Dufton1, S. J. Smartt2 and N. C. Hambly31 Department of Pure & Applied Physics, The Queen's University of Belfast, BT7 1NN, Northern Ireland, UK
2 Institute for Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 OBA,UK
3 Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, Scotland, UK
(Received 21 October 2003 / Accepted 15 February 2004)
Abstract
High resolution echelle spectroscopy is presented for thirteen stars
lying in the direction of the Galactic centre which, on the basis of
photographic photometry and low dispersion spectroscopy, have been
classified as early-B-type. Eight of these stars have large
rotational
velocities which preclude a detailed analysis. The five stars with
moderate to low projected rotational velocities
have been analysed using model atmosphere techniques to
determine atmospheric parameters and chemical compositions. Two of
these stars appear to be evolved blue horizontal branch objects on the
basis of their chemical compositions and small projected rotational
velocity. The evolutionary status of a third is ambiguous but it is
probably a post-asymptotic-giant branch star. The remaining two
objects are probably young massive stars and show enhanced abundances
of N, C, Mg and Si, consistent with their formation in the inner part
of the Galactic disk. However their O abundances are normal,
confirming results found previously for other early-type stars, which
would imply a flat abundance gradient for this element in the inner
region of our Galaxy.
Key words: stars: early-type -- stars: atmospheres -- stars: abundances -- Galaxy: evolution -- Galaxy: center -- Galaxy: abundances
Offprint request: P. L. Dufton, p.dufton@qub.ac.uk
SIMBAD Objects
© ESO 2004
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