Optical studies of transient low-mass X-ray binaries in quiescence. I - Centaurus X-4: Orbital period, light curve, spectrum and models for the system

Details Optical studies of transient low-mass X-ray binaries in quiescence. I - Centaurus X-4: Orbital period, light curve, spectrum and models for the system Optical studies of transient low-mass X-ray binaries in quiescence. I - Centaurus X-4: Orbital period, light curve, spectrum and models for the system

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...210..114c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 210, no. 1-2, Feb. 1989, p. 114-126.

Astronomy and Astrophysics

Astrophysics

79

K Stars, Neutron Stars, Stellar Models, Stellar Spectra, Visible Spectrum, X Ray Binaries, Charge Coupled Devices, Light Curve, Stellar Color, Stellar Luminosity, Stellar Magnitude, Stellar Mass Accretion

Scientific paper

The results of CCD photometry of the Centaurus X-4 soft X-ray transient source are presented. Analysis of the observations shows that the brightness of the system in the quiescent state is modulated with a period of 15.1 hours. The mean brightness of the system is variable between V of about 18.5 and V = 18.35. In April 1986 an active state was found where the object was bluer, brighter by about 0.5 mag in V, and varying rapidly in an erratic fashion, the quiescent light curve having disappeared even in the I-band. The amplitude and general shape of the quiescent light curve seem to be independent of the mean brightness. A rather stable minimum appears at phi of about 0.4, but significant variability is seen in the phi interval from about 0.4 to 0.8. Low-dispersion spectra taken in the quiescent state reveal that the cool companion is a dwarf of spectral type close to K7V. A classical interpretation of the system involving a Roche lobe-filling K star is discussed.

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