The orbital period of 4U/MXB 1636-53 (V801 Arae)

Details The orbital period of 4U/MXB 1636-53 (V801 Arae) The orbital period of 4U/MXB 1636-53 (V801 Arae)

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234..181v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 181-187.

Astronomy and Astrophysics

Astrophysics

26

Astronomical Photometry, Orbital Mechanics, Stellar Orbits, X Ray Binaries, Ephemerides, Light Curve, Periodic Variations

Scientific paper

The results of CCD photometry of the optical counterpart (V801 Arae) of the X-ray burst source 4U/MXB 1636-53, obtained between 1984 and 1988 are reported. From these data, and additional measurements discussed previously, a linear orbital ephemeris P(orb) = 3.803878 + or - 0.000022 h covering the interval between 1980 and 1988 is derived. The results confirm that substantial night-to-night variations occur in the shape of the light curve, superposed on the periodic brightness variations. No evidence is found for a relation between orbital phase and the delays of optical bursts relative to the coincident X-ray bursts. The variation with orbital phase of the corresponding ratios of optical to X-ray burst fluences and peak fluxes does not follow the average optical light curve. These results suggest that substantial long-term changes occur in the spatial distribution of reprocessing matter in the binary system.

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