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Skylab ultraviolet stellar spectra - A new white dwarf, HD 149499 BThe letter reports the discovery of a cool star with excess brightness in the vacuum ultraviolet on an objective-prism photograph obtained during the second Skylab mission. This star, HD 149499, is of type K0 V and has a companion with an apparent magnitude of about 11.8; the relatively flat UV spectrum observed at the position of HD 149499 is characteristic of a 10th or 11th magnitude unreddened O- or early B-type star. It is shown that the excess VUV brightness is due to the companion, HD 149499B, which probably lies in the region of the H-R diagram occupied by the hot white dwarfs. Inspection of white dwarf lists indicates that this star is the sixth or seventh brightest white dwarf known. A maximum orbital motion of 0.025 arcsec/yr is estimated along with a period of just under 500 yr.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Parsons, S. B. (Centre National de la Recherche Scientifique Marseilles, France)
Wray, J. D. (Centre National de la Recherche Scientifique Marseilles, France)
Benedict, G. F. (Texas, University Austin, Tex., United States)
Henize, K. G. (Texas, University, Austin; NASA, Johnson Space Center Houston, Tex., United States)
Laget, M. (CNRS Laboratoire d'Astronomie Spatiale, Marseille, France)
Date Acquired
August 8, 2013
Publication Date
May 15, 1976
Publication Information
Publication: Astrophysical Journal
Volume: 206
Subject Category
Funding Number(s)
Distribution Limits