Extended optical spectroscopy of the massive companion of 4U 1907+09

Details Extended optical spectroscopy of the massive companion of 4U 1907+09 Extended optical spectroscopy of the massive companion of 4U 1907+09

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...209..173v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 209, no. 1-2, Jan. 1989, p. 173-182.

Astronomy and Astrophysics

Astrophysics

26

Astronomical Spectroscopy, Companion Stars, Interstellar Gas, Light Curve, Supergiant Stars, X Ray Binaries, Absorption Spectra, Astronomical Models, B Stars, H Alpha Line, Helium, Stellar Envelopes, Stellar Winds

Scientific paper

A series of spectra of the optical counterpart of 4U 1907+09, taken in June 1986 and in June 1987, shows H-alpha in emission, and He I and interstellar lines in absorption. The H-alpha emission profile is found to be variable, possibly in correlation with orbital phase. Two models for the system are discussed, one in which the primary is a Be star with an extended disk, and one in which it is a supergiant with a strong stellar wind. On the basis of the observations presented in this paper and earlier observations taken from the literature, it is shown that the classification of the companion star as a supergiant is virtually certain.

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