Early-type stars towards the Galactic Center. II. (Dufton+, 2001)

Details Early-type stars towards the Galactic Center. II. (Dufton+, 2001) Early-type stars towards the Galactic Center. II. (Dufton+, 2001)

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ycat..33730608d&link_type=abstract

VizieR On-line Data Catalog: J/A+A/373/608. Originally published in: 2001A&A...373..608D

Physics

Stars: Early-Type, Stars: Blue, Photometry, Equivalent Widths

Scientific paper

We are searching for early-type stars towards the Galactic centre which are potentially young objects situated within the inner few kiloparsecs of the disk. Photographic photometry from the UK Schmidt Telescope has been used to identify the bluest candidates in nineteen Schmidt fields (centred close to the Galactic centre). We have previously obtained FLAIR low dispersion spectroscopy for three of these fields to estimate spectral types and here we present spectroscopy for an additional seven fields. Combining the results for all ten fields, 56 stars were initially classified as early-B type. Estimates of the equivalent widths of their Balmer and He I lines have been used to estimate atmospheric parameters and 32 targets have effective temperatures greater than or equal to 17000K (corresponding to a spectral type of B3 or earlier). The spectra of seven of these targets also have absorption lines due to O II and Si III and can be reliably classified as early-B type. Additionally 78 stars have estimated effective temperatures between 11000 and 16000K with a further 50 objects identified as late-B (or early-A) type. All but two of the early B-type candidates have magnitudes in the range 12.0<=V<=16.0, and our best estimates of their distance suggest that they could be close to (i.e. Rg<3kpc), or even beyond the Galactic centre. (8 data files).

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