Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt.........8v&link_type=abstract
PhD Dissertation, Louisiana State Univ. Baton Rouge, LA United States
Astronomy and Astrophysics
Astronomy
1
B Stars, O Stars, Stellar Spectra, Galactic Structure, Cosmic Dust, Milky Way Galaxy, Star Clusters, Astronomical Photometry, Spectrum Analysis, Stellar Systems, Astronomical Spectroscopy, Sky Surveys (Astronomy), Spectral Signatures, Early Stars
Scientific paper
We present here the results of an analysis of spectroscopic and photometric observations of OB(+) stars. These mostly luminous young stars were selected from a survey of the Milky Way that is complete to the 12th B magnitude and covers 360 deg of galactic longitude and +/- 10 deg of galactic latitude. We determined the MK spectral types of 291 OB(+) stars; a detailed discussion of the MK system and the process of spectral classification are given. Using the MK types and UBV photometry, we derived the distances to these stars and to other OB(+) stars that had published MK spectral types. We thus have distances to nearly all of the non-emission OB(+) stars in the Milky Way down to the 12th B magnitude. We derive the space distribution of these stars and compare it with previous studies of galactic structure. The color excesses derived from these data are plotted to show the distribution of dust in the galactic plane out to several kpc. As is often the case in surveys of this nature, several astrophysically interesting peculiar spectra were observed, and these too are described.
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