Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..739t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 739-742.
Astronomy and Astrophysics
Astronomy
27
Binary Stars, Black Holes (Astronomy), Orbital Elements, Stellar Spectrophotometry, Variable Stars, Visible Spectrum, Charge Coupled Devices, Light Curve, Mass Transfer, Radiant Heating, Roche Limit, Spectrum Analysis
Scientific paper
CCD photometric measurements of the optical counterpart of 4U 1957 + 11 show a roughly sinusoidal variation with a period of 0.3887 + or - 0.0005 days (= 9.329 + or - 0.011 hr); the cycle-count alias period at 0.2801 + or - 0.0003 days (= 6.722 + or - 0.008 hr) also fits the data but is very unlikely. The V-band light curve has an amplitude of about 0.23 mag peak to peak, but there is considerable random variation as well. It is argued by analogy with similar sources that the modulation is likely to be caused by X-ray heating of the normal companion star in an interacting binary system. If the mass transfer in the system is caused by Roche-lobe overflow, the period suggests that the companion is very nearly identical to the sun in mass and radius.
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