Other
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.257..225a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 257, no. 2, July 15, 1992, p. 225-239.
Other
70
A Stars, Astronomical Spectroscopy, Blue Stars, Galactic Structure, Horizontal Branch Stars, Variable Stars, Astronomical Photometry, Balmer Series, Galactic Evolution, Halos, Main Sequence Stars, Milky Way Galaxy
Scientific paper
Results are presented of spectroscopic observations at 2-A resolution of 44 stars in two fields. A total of 39 are identified as blue horizontal branch (BHB) stars, RR Lyrae, or main-sequence A stars. The candidates were selected by color from digitized UK Schmidt direct plates and by the presence of a strong Balmer discontinuity in their objective prism spectra. Velocities and distances are measured for each of the BHB candidates. At moderate spectral dispersion the distinction between main-sequence A stars and horizontal branch stars cannot be made on the basis of hydrogen linewidths alone. Four stars at a distance of 30 kpc in one field are found to have a velocity dispersion of less than 12 km/s, and a systematic velocity of 70 km/s with respect to the Galactic rest frame. These stars are not bound to each other but may be the stellar remnants of a recently disrupted halo cluster.
Arnold Richard
Gilmore Gerard
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