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• W2031387940 abstract "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. U1, the ratio of the transferred luminosity to the surface luminosity of the primary, and U2, the ratio of the transferred luminosity to the nuclear luminosity of the secondary. The theoretical curves(U1 versus q and U2 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 U1 and U2 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 U2: the higher U2, 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 U1 and decreases with increasing U1. 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." @default.
• W2031387940 created "2016-06-24" @default.
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• W2031387940 date "2009-07-11" @default.
• W2031387940 modified "2023-10-16" @default.
• W2031387940 title "Energy transfer and its effects on the secondaries in W Ursae Majoris type contact binaries" @default.
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• W2031387940 doi "https://doi.org/10.1111/j.1365-2966.2009.14852.x" @default.
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