Discovery of the 10.6 HR orbital period of CAL 87 - an eclipsing low-mass X-ray binary in the Large Magellanic Cloud

Details Discovery of the 10.6 HR orbital period of CAL 87 - an eclipsing low-mass X-ray binary in the Large Magellanic Cloud Discovery of the 10.6 HR orbital period of CAL 87 - an eclipsing low-mass X-ray binary in the Large Magellanic Cloud

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.241p..37c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 241, Nov. 15, 1989, p. 37P-41P.

Astronomy and Astrophysics

Astronomy

22

Eclipsing Binary Stars, Magellanic Clouds, X Ray Binaries, Accretion Disks, Light Curve, Stellar Color, Stellar Mass, X Ray Spectra

Scientific paper

It is shown that the LMC low-mass X-ray binary CAL 87 is an eclipsing system with a period of 10.6 hr. The primary eclipse is color-dependent, and there is also a secondary dip in the light curve, interpreted as being due to occulation by a secondary bulge in the disk displaced about 0.5 in phase from the primary bulge. The optical properties of CAL 87 are similar to the dipping and eclipsing LMXB X1822 - 371, although the temperature of their X-ray spectra differ by a factor of about 100.

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