Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..539c&link_type=abstract
Astrophysical Journal, Part 1, vol. 231, July 15, 1979, p. 539-550. NSF-supported research.
Astronomy and Astrophysics
Astrophysics
127
Astronomical Spectroscopy, Binary Stars, Halos, X Ray Sources, Astronomical Photometry, Graphs (Charts), Light Curve, Orbital Elements, Radial Velocity, Stellar Spectra, Tables (Data)
Scientific paper
Spectroscopic observations show the orbital period of V1341 Cyg (Cyg X-2) to be 9.843 days. Published photometric data, phased on this period, give a classical ellipsoidal (double-peaked) light curve with minima at the two conjunctions, implying the star is distorted to approximately its Roche lobe. The observed mass function, lack of X-ray eclipses, and analysis of the light curve restrict the masses to between 1.3 and 1.8 solar masses for the X-ray star and between 0.5 and 1.1 solar masses for the optical star. A new distance determination shows the system to be at about 8 kpc in the direction of galactic rotation (galactic longitude = 87 deg) and about 1.5 kpc above the plane. The large systemic velocity (-222 km/s), small mass, and possibly weak metals lines suggest the source is a halo object which, like the globular clusters, does not rotate with the galactic disk. Spectroscopic and photometric data show there may be variable X-ray heating on the optical star.
Cowley Anne Pyne
Crampton David
Hutchings John B.
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