A UBV photometric study of the 5.2 hour X-ray binary 4U 2129+47

Details A UBV photometric study of the 5.2 hour X-ray binary 4U 2129+47 A UBV photometric study of the 5.2 hour X-ray binary 4U 2129+47

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..900m&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Feb. 1, 1981, p. 900-910.

Astronomy and Astrophysics

Astrophysics

41

Binary Stars, Electrophotometry, Light Curve, Stellar Spectrophotometry, Ubv Spectra, X Ray Stars, Companion Stars, Early Stars, Main Sequence Stars, Radial Velocity, Stellar Luminosity, Stellar Mass

Scientific paper

The paper presents results derived from UBV photometric observations of the 5.2 X-ray binary 4U 2129+47 which were made on 11 nights between 1978 October and 1979 August. The light curves observed during this period are relatively stable in shape and amplitude (Delta B = 1.5 mag) and are a surprisingly close match to the time-averaged light curves observed for HZ Her. There is a significant asymmetry in their shape which is independent of color and varies in amplitude by a factor of approximately 2. The UBV colors at minimum light suggest a considerably earlier spectral type (G or earlier) than is inferred by assuming that the star fills its Roche lobe (late K or early M). Optical pulsations were studied, and a 3 sigma limit of 0.5% was set on the fraction of the flux which is pulsed for periods between 60 ms and 300 s. Assuming that the optical companion is a normal main-sequence star filling its Roche lobe, its mass is approximately 0.65 solar mass. Assuming also that the compact object has a mass of 1.3 solar masses and that the orbital inclination of the system is approximately 90 deg, it is found that the orbital separation is approximately 1.9 solar radii and K-opt is approximately 300 km/s.

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