CAL 83 - A 1-day period low-mass X-ray binary in the LMC

Details CAL 83 - A 1-day period low-mass X-ray binary in the LMC CAL 83 - A 1-day period low-mass X-ray binary in the LMC

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.233...51s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 233, July 1, 1988, p. 51-63. Research supported by the

Astronomy and Astrophysics

Astronomy

67

Astronomical Photometry, Charge Coupled Devices, Magellanic Clouds, Visual Photometry, X Ray Binaries, Accretion Disks, Astronomical Spectroscopy, Helium, Line Spectra, Neutron Stars, Power Spectra

Scientific paper

From the analysis of extensive V-band CCD photometry obtained in an international campaign in December, 1984 the orbital period of CAL 83 is unambiguously determined to be 1.0436 + or - 0.0044 day, with a sinusoidal modulation of full amplitude 0.22 mag about a mean of V = 16.87. Superimposed on this modulation evidence for occasional variability on a shorter time-scale of about 2 hr is found. Data obtained in August, 1984 showed that the source was in a brighter state at this time, with a mean brightness of V = 16.32 and a maximum of V = 16.20; overall CAL 83 has been observed over a brightness range of 0.9 mag. Optical spectroscopy obtained contemporaneously from AAO and ESO is consistent with the photometric period, with a probable K-velocity of about 40 km/s. No evidence is found for an X-ray photoionized nebula surrounding CAL 83. The low L(x)/L(opt) ratio of CAL 83 indicates that it contains an accretion disc corona, and the intensity of its He II line implies a luminosity in X-rays which intrinsically is extremely high; therefore CAL 83 and LMC X-2 are the two most luminous loss mass X-ray binaries known at both optical and X-ray energies.

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