Other
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..937t&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 194, Mar. 1981, p. 937-946.
Other
61
B Stars, Normality, O Stars, Stellar Spectra, Stellar Spectrophotometry, Balmer Series, H Lines, Helium, Main Sequence Stars, Stellar Evolution, Stellar Luminosity, Stellar Magnitude, Stellar Rotation, Subdwarf Stars
Scientific paper
Results of a search for subluminosity or other peculiarities in the spectra of apparently normal OB stars located at large distances from the galactic plane are presented. Photographic spectrograms were compared for stars of type B5 and earlier located within 0.5 kpc of and further than 1.5 kpc from the galactic plane, and for three subdwarf stars. Values of the projected axial rotation, surface gravity, absolute magnitude and the strengths of certain He I and Balmer lines determined for both groups of OB stars are found to be similar, and distinct from the spectral characteristics of the subdwarfs. The results suggest that, unless the normality of the distant OB stars is illusory, either OB stars can be formed outside the galactic plane, or a mechanism must exist to eject them from the plane with large velocities, unless their main sequence lifetimes are substantially longer than currently believed.
Kilkenny Dave
Tobin William
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