Cygnus X-2 - A low-mass binary

Details Cygnus X-2 - A low-mass binary Cygnus X-2 - A low-mass binary

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207l.171c&link_type=abstract

Astrophysical Journal, vol. 207, Aug. 1, 1976, pt. 2, p. L171-L176. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

13

Binary Stars, Stellar Mass, Stellar Spectra, X Ray Sources, Emission Spectra, F Stars, Helium, Radial Velocity, Stellar Models

Scientific paper

Radial velocities of Cyg X-2 derived from Kitt Peak and Lick Observatory spectrograms are shown to fit a period near 0.86 days with a semiamplitude of 112 km/s. Both the apparent spectral type and the He II 4686-A emissionn vary with phase; the earliest type coincides with the strongest emission. The implied model is one in which an F star is strongly heated on the side facing the X-ray source (a neutron star). The most probable masses are 2 solar masses for the F star and 1 solar mass for the X-ray source, if no X-ray eclipses are present.

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