Other
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..241w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Oct. 1981, p. 241-246.
Other
7
O Stars, Stellar Spectra, Stellar Spectrophotometry, Subdwarf Stars, Astronomical Photometry, H Lines, Stellar Magnitude, White Dwarf Stars
Scientific paper
Four stars which, from their photometry, would appear to be O subdwarfs are discussed. These stars (II + 18009, II + 22021, IV + 10009, and VI - 03019), having colors much bluer than other OB+ stars brighter than photographic magnitude 12, lie at the very tip of the locus for unreddened main sequence stars in the U-B, B-V diagram. The four stars have visual magnitudes between 10 and 13 and, since any main sequence or more luminous stars as faint as that would be noticeably reddened, they are expected to be O subdwarfs. Two of the stars, 18009, and 22021, lie in the galactic plane where distance can be estimated with reasonable accuracy from interstellar dust absorption.
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