Other
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242l.109m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 242, Dec. 1, 1980, p. L109-L113. Research supported by the Miller In
Other
43
Binary Stars, Companion Stars, Variable Stars, X Ray Stars, Gas Streams, Light Curve, Main Sequence Stars, Stellar Luminosity
Scientific paper
A periodic 5.57 hr modulation has been observed in the optical counterpart of the X-ray source 2S 1822-371. Two alternative periods are consistent with the data: P = 0.232114d and P = 0.232191d, with statistical uncertainties of 0.000015d in each case. Minimum light occurred at JD 2,444,105.668 + or - 0.005. The amplitude of the modulation is about 1 mag, independent of UBV color, and no variability exceeding the 2% level other than the 5.57 hr effect is found on time scales down to a few seconds. The light curve of the star can be understood in terms of a highly inclined close binary system which contains a relatively large, luminous accretion disk that is periodically occulted by a companion star and an associated gas stream. On the assumption that the companion is a main-sequence star, the distance of the system is found to be more than 600 pc, based on the absence of color variations commensurate with the 5.57 hr intensity cycle.
Hunt Leslie K.
Mason Keith O.
Middleditch John
Nelson Jerry E.
Seitzer Pat
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