Astronomy and Astrophysics – Astronomy
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85..549s&link_type=abstract
Astronomical Journal, vol. 85, May 1980, p. 549-554.
Astronomy and Astrophysics
Astronomy
32
Collimators, Heao 1, O Stars, Spaceborne Astronomy, Stellar Spectrophotometry, Supergiant Stars, Emission Spectra, H Alpha Line, Optical Measurement, Stellar Winds, X Ray Spectra
Scientific paper
The paper reports an optical identification of 4U1907 + 09 with a m(v) = 16.4 stellar object in the location determined by the scanning modulation collimator experiment on the first High Energy Astronomy Observatory (HEAO-1). The identification is based on the presence of very strong and broad H-alpha emission. The optical data constrain the distance to be 2-13 kpc, and this gives a range of uncertainty to the typical 2-10 keV luminosity of (1 x 10 to the 35th to 3 x 10 to the 36th) erg/s. The X-ray spectrum and variability is reported, and consideration is given to the hypothesis that the object is an OB supergiant, although its faintness in the blue makes precise spectral classification impossible. It is suggested that this system is an example of a luminous, massive primary emitting a stellar wind which is accreted on the compact object.
Bowyer Stuart
Charles Phil A.
Griffiths Richard E.
Schwartz Dana A.
Thorstensen John R.
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