Discovery and optical identification of 2S0921-630

Details Discovery and optical identification of 2S0921-630 Discovery and optical identification of 2S0921-630

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.276..799l&link_type=abstract

Nature, vol. 276, Dec. 21-28, 1978, p. 799. NASA-supported research.

Other

15

Binary Stars, Stellar Magnitude, Visual Observation, X Ray Sources, Emission Spectra, Galactic Rotation, H Beta Line, Helium, Sas-3, X Ray Binaries, X Ray Stars

Scientific paper

The discovery of a faint X-ray source at approximately 282 deg galactic longitude, -9 deg galactic latitude with the rotation modulation collimator X-ray detectors aboard SAS 3 is reported. The source is designated 2S 0921-630 and is tentatively identified, on the basis of an optical search, with a 17th magnitude star exhibiting the He II line at 4686 A and H-beta in emission. The optical spectrum of this star is shown to be similar to those of the optical counterparts of Sco X-1 and other such galactic X-ray sources. It is suggested that 2S 0921-630 may belong to the class of low-luminosity galactic X-ray binaries.

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