Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.231..663s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 231, April 1, 1988, p. 663-671.
Astronomy and Astrophysics
Astronomy
24
Black Body Radiation, Neutron Stars, Orbital Velocity, Stellar Atmospheres, Stellar Mass, X Ray Binaries, High Temperature, Late Stars, Roche Limit, Telescopes
Scientific paper
From the analysis of more than 300 CCD frames of XB1636-536 obtained over a week of observing, the 3.8-hr orbital period suggested by Pedersen et al. (1982) is confirmed, and an ephemeris is found for the time of maximum light of HJD 244 6952.7510 + or - 0.0058+nx(0.15844 + or - 0.00057). The orbital modulation is sinusoidal, with a semiamplitude in V of 0.122 + or - 0.028 mag. The magnitude and mean color index (not dereddened) of the source are V = 17.82 + or - 0.05, B-V = 0.64 + or - 0.10. An upper limit of 0.08 mag (90 percent confidence) is placed on the full amplitude of modulation of B-V with phase. The observed orbital variations in V and the lack of B-V variability can be reproduced using a simple model for the optical emission, with a constant component originating in the accretion disc and an additional variable component due to the reprocessing of X-rays in the heated face of the secondary. Regardless of whether this variable component is represented by a blackbody or a 'normal' stellar atmosphere, the temperature of the heated region is found to be in the range 20000-35000 K. The present results suggest that a large fraction of the facing hemisphere of the secondary is directly illuminated by X-rays from the compact object.
Mukai Koji
Smale Alan P.
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