摘要
短周期食双星Ｖ３６１Ｌｙｒ（Ｐ＝０．３０９６天）可能是观测到的最短周期的由非简并天体组成的近相接双星，本文采用Ｋａｌｕｚｎｙｌ９８９年观测到的Ｖ和Ｉ光变曲线进行了详细的测光分析。考虑到次子星上由于吸积而引起的热斑在径度方向的可能延伸效应，而采用了多热斑模型近似，结果取得了对观测到的畸变光变曲线的很好的拟合，测光解表明，Ｖ３６１Ｌｙｒ是一颗近相接的不接双星；测光质比ｑ＝０．６９６±０．００５；次子星是演化了的亚巨星；三个热斑的平均温度约７３４０Ｋ。本文估计了双星的绝对质量和半径，得到热斑的吸积光度约１．０７×１０３２ｅｒｇ·ｓ－１，相当于可能的质量交流率约７．０×１０－７Ｍ⊙ｙｒ－１。并对已知的１５个Ａ－Ｋ型近相接不接双星的统计性质作了讨论。
The eclipsing binary star V361 Lyr may be one observed with the shortest orbital period in near-contact systems with non-degenerate components.The 1989 V and I light curves of Kaluzny(1991) are secured to carry out a detailed photometric analysis.We used a multi-spot model to approach the hot spot area which probably stretched in longitude on the secondary caused by mass accretion from the primary.As a result,the theoretical light curves of our solution show much better for fitting the observations than that of Kaluzny's solution based on one-spot model.The new solution reveals that V361 Lyr is a near-contact detached binary system with photometric mass ratio about q=m2/m1=0.696±0.005 and the secondary component appears to be an evolved subgiant star with oversized and hence overluminosity for its ZAMS mass.The parameters for each of three hot spots are determined by using the differential correction adjustment, and the average spot temperature is found to be～7340 K.The total accretion luminosity amounts to 1.07×1032 erg S-1,indicating a mass transfer rate of 7.0×10-7 M⊙ yr-1 from the primary.15A-K type near-contact detached binary systems are collected and a discussion about the statistical characteristics of them is also presented.
出处
《天文学报》
CSCD
北大核心
1995年第1期37-46,共10页
Acta Astronomica Sinica
