A UKST survey of blue objects towards the galactic centre - a search for early-type stars

Details A UKST survey of blue objects towards the galactic centre - a search for early-type stars A UKST survey of blue objects towards the galactic centre - a search for early-type stars

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..139..231d&link_type=abstract

Astronomy and Astrophysics Supplement, v.139, p.231-244

Astronomy and Astrophysics

Astrophysics

3

Stars: Early-Type, Stars: Fundamental Parameters, Stars: Imaging, Galaxy: Center

Scientific paper

We have begun a search for early-type stars towards the galactic centre which are potentially young objects situated within the inner few kiloparsecs of the disk. U and V (or I) band photographic photometry from the UK Schmidt Telescope has been obtained to identify the bluest candidates in nineteen Schmidt fields (centred close to the galactic centre). We have spectroscopically observed these targets for three fields with the FLAIR multi-fibre system to determine their spectral types. In particular, ten early B-type stars have been identified and equivalent width measurements of their Balmer and He i lines have been used to estimate atmospheric parameters. These early-type objects have magnitudes in the range 11.5<= V<= 16.0, and our best estimates of their distance (given probable highly variable reddening in this direction together with errors in the plate photometry) suggest that some of them originated close to (i.e R_g<3 kpc), or even beyond the galactic centre. Future high-resolution spectroscopy of these stars will provide reliable atmospheric parameters and element abundances, in order to map the current chemical composition of the inner galaxy.

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