A radial velocity study of 4U 2129+47 - A low mass X-ray binary system

Details A radial velocity study of 4U 2129+47 - A low mass X-ray binary system A radial velocity study of 4U 2129+47 - A low mass X-ray binary system

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..756t&link_type=abstract

Astrophysical Journal, Part 1, vol. 253, Feb. 15, 1982, p. 756-759.

Astronomy and Astrophysics

Astrophysics

19

Binary Stars, Radial Velocity, Stellar Spectra, X Ray Sources, Balmer Series, Calcium, Helium Ions, Stellar Luminosity, Stellar Mass

Scientific paper

He II 4686 A line radial velocity variations that are in phase with the 5.25-hour binary period have been detected in the low-luminosity X-ray binary 4U 2129+47, where the observed K velocity of 216 + or - 70 km/sec implies a compact object mass of 0.53 solar masses. This low system mass suggests that the object may be a degenerate dwarf. While the 4686 A line is broad, and may originate in an accretion disk, the 4640 A feature is narrow and may originate at the heated face of the normal star, as is attested by its radial velocity.

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