Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.294..725p&link_type=abstract
Nature, vol. 294, Dec. 24-31, 1981, p. 725-727. Research supported by the Nederlandse Organisatie voor Zuiver-Wetenschappelijk O
Astronomy and Astrophysics
Astronomy
36
Binary Stars, Bursts, Orbital Elements, X Ray Astronomy, X Ray Sources, Companion Stars, Galactic Bulge, Light Curve, Optical Properties, Stellar Spectra, X Ray Binaries
Scientific paper
The characterization of X-ray burst sources and other, non-bursting galactic bulge X-ray sources as low-mass close binary systems is generally accepted. The companion stars of the transient burst sources Aql X-1 and Cen X-4 are of spectral types G7-K3V and K3-7V, respectively. If these stars fill their Roche lobe, their orbital periods are in the range of 5-8 hr. X-ray observations offer evidence for a Cen X-4 orbital period of about 8 hr. An analysis of average optical properties yields values for the typical companion star masses and orbital periods of this class of low-mass X-ray binaries of about 0.6 solar masses and 6 hr, respectively.
Lewin Walter H. G.
Paradijs Jan van
Pedersen Holger
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