Accurate Period Determination of an Eclipsing Binary X-Ray Source in M33

Details Accurate Period Determination of an Eclipsing Binary X-Ray Source in M33 Accurate Period Determination of an Eclipsing Binary X-Ray Source in M33

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...418l..67s&link_type=abstract

Astrophysical Journal Letters v.418, p.L67

Astronomy and Astrophysics

Astronomy

12

Galaxies: Individual Messier Number: M33, Stars: Binaries: Eclipsing, Stars: Individual Alphanumeric: M33 X-7, X-Rays: Galaxies, X-Rays: Stars

Scientific paper

We have analyzed the time variability of one of the X-ray sources in M33 observed by both the ROSAT and Einstein Observatory telescopes. The light curve of M33 X-7 exhibits a variability pattern of high and low states, suggesting an eclipsing binary X-ray source. The data suggest a binary period P = 1.78572 days (very close to that of Her X-1) and an eclipse duration of ~0.4 days. The low phase lasts about one-fourth of the period as in Cen X-3.

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