Close binary systems in regions of OB associations. VI. V498 Cyg in Cyg OB9
M. M. ZakirovUzbekistan National University, Vuzgorodok, Tashkent, 100174, UzbekistanM. U. EshankulovaAstronomical Institute, Academy of Sciences of Uzbekistan, ul. Astronomicheskaya 33, Tashkent, 100052, Uzbekistan
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Abstract
New photoelectric UBVR observations of the early-type eclipsing variable V498 Cyg were carried out in 1999–2002. New moments of minima were obtained and the ephemeris of the binary was improved: Min I = HJD 2442633.3955(90) + 3.4848437(34)E. All observations were grouped into two seasons, 1999-2001 and 2002, according to the light curve shape. The light curves were solved by Lavrov’s direct method, and the photometric orbit elements were calculated. Our estimates of the fundamental parameters of the binary components allowed us to class them with the B1 III and B3 III stars. Judging from the distance modulus, proper motion, and age of the binary, it can be assigned to the physical members of the Cyg OB9 association.
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