Abstract
UTRAVIOLET objects detected by the S2/68 UV sky-survey telescope1 aboard the TD-1 satellite consist primarily of known early-type stars. In addition, there is a substantial subgroup of unidentified and/or untyped ultraviolet stars including some new hot subdwarfs2,3 and a small subgroup of known late-type objects including the 20 stars of types F and G listed in the Ultraviolet Bright-Star Spectrophotometric Catalogue4. Selection of those objects whose ultraviolet colours suggest that they are earlier than an unreddened B5 V star ought to eliminate the latter category entirely, but several apparently late-type anomalies persist. If these objects cannot be discarded on grounds of blending, misidentification, inaccurate ultraviolet colours (objects with low flux or few orbital passes), or erroneous prior spectral types taken from thp literature, then one is confronted with the possibility of genuine duplicity. UV0246–37, taken from the UCL Catalogue of Ultraviolet Objects soon to be published, is just such an object: a binary system consisting of a previously unrecognised hot ultraviolet star and a cooler G-type primary which wholly dominates in the visible region.
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DARIUS, J., WHITELOCK, P. An ultraviolet subdwarf companion to HD17576. Nature 275, 428–429 (1978). https://doi.org/10.1038/275428a0
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DOI: https://doi.org/10.1038/275428a0
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