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Additional info for Close binaries in the 21st century : new opportunities and challenges
J. V. 2006 Abstract The formations of the blue straggler stars and the FK Com-type stars are unsolved problems in stellar astrophysics. One of the possibilities for their formations is from the coalescence of W UMa-type overcontact binary systems. 25) overcontact binary stars are a very important source to understand the phenomena of Blue Straggler/FK Com-type stars. Recently, 12 W UMa-type binary stars, FG Hya, GR Vir, IK Per, TV Mus, CU Tau, V857 Her, V410 Aur, XY Boo, SX CrV, QX And, GSC 619-232, and AH Cnc, were investigated photometrically.
The new time of minimum ﬁts well to the forecast of the O − C curve published by Mayer et al. (1994); also minima published by Gorda (2000) ﬁt the forecast. , 1998). The O − C graphs for this and the other stars are presented in Fig. 2. FZ CMa. New times of minima ﬁt the LITE elements of Zasche (2005) quite well. 5 min. QZ Car. 53, as was observed for data by ASAS Springer 38 Astrophys Space Sci (2006) 304:37–39 Table 1 New times of minimum light System V1182 Aql LY Aur SZ Cam FZ CMa LZ Cen V606 Cen AH Cep TU Mus Fig.
1994)). UBV observations obtained by MW during 6 nights in 2004 with the 50 cm telescope at SAAO. Fluxes from IUE spectra, which were also used for RV determination by Stickland et al. (1996) and Penny et al. (1999). 2. Spectroscopic solution In the binary spectra the He I and He II lines of both components are of nearly equal strength. This conﬁnes the light curve solution: both temperatures should not differ by more than about 2000 K. Using the temperature scale by Springer 46 Astrophys Space Sci (2006) 304:45–47 Fig.