Energy transfer and its effects on the secondaries in W Ursae Majoris type contact binaries
Energy transfer and its effects on the secondaries in W Ursae Majoris type contact binaries
复制标题
W Ursae Majoris 型接触双星中的能量转移及其对次级星的影响
DOI：
10.1111/j.1365-2966.2009.14852.x
复制
发表时间：
2009-04
影响因子：
4.8
通讯作者：
Jiang, Dengkai
中科院分区：
文献类型：
--
作者：
Jiang, Tianyu;Li, Lifang;Han, Zhanwen;Jiang, Dengkai
Based on the physical parameters of 133 W Ursae Majoris (W UMa) type contact binaries, energy transfer and its effects on the secondaries in W UMa contact binaries are investigated. Relations are given between the mass ratio (q) for W UMa contact binaries and the relative energy transfer rates, i.e. U(1), the ratio of the transferred luminosity to the surface luminosity of the primary, and U(2), the ratio of the transferred luminosity to the nuclear luminosity of the secondary. The theoretical curves(U(1) versus q and U(2) versus q) are derived based on various assumptions: that the two components in each W UMa system are nearly identical in effective temperature and just fill their inner Roche lobes, and the primaries are zero-age main-sequence stars. Although these curves can reflect the distribution of U(1) and U(2) versus q, some observational systems deviate significantly from these curves. This results mainly from the difference in effective temperatures of the components of W UMa systems. The radius and the density of the secondary are related to the relative energy transfer rate U(2): the higher U(2), the greater the expansion and the lower the density of the secondary in a W UMa system. In addition, it is found that the temperature difference of W UMa binary components is correlated with the relative energy transfer rate U(1) and decreases with increasing U(1). This might suggest that there is a thermal coupling between the two components in W UMa contact binaries, and that the classification of W UMa contact binaries into A or W types depends on the energy transfer from the primary to the secondary. The temperature difference of W UMa binary components is poorly correlated with the mass of the primary. This suggests that the properties of the common envelope of a W UMa contact binary might not have a significant effect on the energy transfer between the two components.
登录
查看更多内容
影响因子：
8.7
作者：
C. Lacy
通讯作者：
C. Lacy
影响因子：
6.5
作者：
S. Zoła;P. Niarchos;V. Manimanis;A. Dapergolas
通讯作者：
S. Zoła;P. Niarchos;V. Manimanis;A. Dapergolas
DOI：
10.1111/j.1365-2966.2005.08609.x
发表时间：
2004-11
影响因子：
4.8
作者：
S. Bilir;Y. Karataş;O. Demircan;Z. Eker
通讯作者：
S. Bilir;Y. Karataş;O. Demircan;Z. Eker
DOI：
10.1086/503871
发表时间：
2006-01
期刊：
The Astronomical Journal
影响因子：
--
作者：
T. Pribulla;S. Rucinski
通讯作者：
T. Pribulla;S. Rucinski
DOI：
10.1111/j.1365-2966.2004.07761.x
发表时间：
2004-03
影响因子：
4.8
作者：
Lifang Li;Zhanwen Han;Fenghui Zhang
通讯作者：
Lifang Li;Zhanwen Han;Fenghui Zhang