New Progress on High Fill-Out, Extreme Mass Ratio Overcontact Binary Systems

摘要

High Fill-Out, Extreme Mass Ratio Overcontact Binary (HFEMOB) are a very important source to understand the structure and evolution of the late-type short-period close binary stars, because they are at the late evolutionary stage of these systems. Recently, the detail photometric studies of fifteen such HFEMOBs, including GR Vir, IK Per, FG Hya, TV Mus, CU Tau, V857 Her, GSC619-232, V410 Aur, XY Boo, AH Cnc, QX and, EM Psc, V345 Gem, XY LMi and V1191 Cyg were published. In the present paper, we summarize these results and give some new observations of some HFEMOB candidates.