An investigation of the micro variations of highly luminous OBA type stars (Alpha Cygni variables). VII - The two interacting O type eclipsing binaries UW CMa = HD 57060 and HD 167971

Details An investigation of the micro variations of highly luminous OBA type stars (Alpha Cygni variables). VII - The two interacting O type eclipsing binaries UW CMa = HD 57060 and HD 167971 An investigation of the micro variations of highly luminous OBA type stars (Alpha Cygni variables). VII - The two interacting O type eclipsing binaries UW CMa = HD 57060 and HD 167971

Sep 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26as...74..467v&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 74, no. 3, Sept. 1988, p. 467-473.

Astronomy and Astrophysics

Astrophysics

11

Astronomical Photometry, Early Stars, Eclipsing Binary Stars, O Stars, Stellar Luminosity, Variable Stars, Cygnus Constellation, Light Curve, Stellar Temperature, Supergiant Stars

Scientific paper

VBLUW photometry of two interacting O type binaries UW CMa and HD 167971 are presented and discussed. The light and colour curves of UW CMa (P = 4d.39336) show evidence of plasma streams in the system. The light amplitude of the optical micro variations likely originating mainly on the O8.5 I component, is about twice as large as for non distorted stars of the same temperature. The micro variations superimposed on the light curve of HD 167971 (P = 3d.3218), likely originating on the more distant component of this triple system, are of a normal size. Convincing colour variations during the binary revolution are detected. The size of these amplitudes are corrected for the light of the companion(s).

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