Period Study and Analysis of 2017 BVRI Observations of the Totally Eclipsing,Solar Type Binary, MT Camelopardalis

摘要

We report here on a period study and analysis of 2017 BVRI light curves of MT Camelopardalis (GSC03737-01085). It is a solar type (T?5500K) eclipsing binary. It was observed for six nights in December 2017 at Dark Sky Observatory (DSO) with the 0.81 -m reflector. Five times of minimum light were calculated from Terrell, Gross, and Cooney's (2016,IBVS6166) 2004 and 2016 observations (hereafter TGC). In addition, eleven more times were taken from the literature and six determined from the present observations. From these 15 years of observations a quadratic ephemeris was calculated: A BVRI filtered simultaneous Wilson-Devinney Program (wd) solution gives a mass ratio (0.3385 ± 0.0014),very nearly the same as TGC's (0.347 ± 0.003),and a component temperature difference of only ~140K. As with TGC, no spot was needed in the modeling. Our modeling (beginning with binary maker 3.0 fits) was done without prior knowledge of TGC's. This shows the agreement achieved when independent analyses are done with the Wilson code. The present observations were taken 1.8 years later than the last curves by TGC, so some variation is expected.