May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229.1079h&link_type=abstract
Astrophysical Journal, Part 1, vol. 229, May 1, 1979, p. 1079-1084. NSF-supported research.
Other
58
Astronomical Spectroscopy, Binary Stars, Early Stars, X Ray Sources, Emission Spectra, O Stars, Orbits, Stellar Luminosity
Scientific paper
Spectroscopic observations of Krzeminski's star at dispersions 25-60 A/mm are described. The primary is an evolved star of type O6-O8(f) with peculiarities, some of which are attributable to X-ray heating. Broad emission lines at 4640A (N III), 4686 A(He II) and H-alpha show self-absorption and do not originate entirely from the region near the X-ray star. The primary is not highly luminous (bolometric magnitude about -9) and does not show signs of an abnormally strong stellar wind. The X-ray source was 'on' at the time of optical observations. Orbital parameters are presented for the primary, which yield masses of 17 + or - 2 and 1.0 + or - 3 solar masses for the stars. The optical star is undermassive for its luminosity, as are other OB-star X-ray primaries. The rotation is probably synchronized with the orbital motion. The distance to Cen X-3 is estimated to be 10 + or - 1 kpc. Basic data for 12 early-type X-ray primaries are discussed briefly
Cowley Anne Pyne
Crampton David
Hutchings John B.
Paradijs Jan van
White Nicholas E.
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