On the masses and the evolution of cataclysmic binaries

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Mass Ratios, Stellar Evolution, Stellar Mass, White Dwarf Stars, Angular Momentum, Giant Stars, Main Sequence Stars, Mass Transfer, Momentum Transfer, Roche Limit, Tables (Data)

Scientific paper

Masses of catacylsmic binaries (CB's) are derived from published observational data and a theoretical relation between the secondary's mass and the period. It is found that the mass ratios of CB's having a relatively massive main sequence secondary are not far from unity. The assumption of a mass ratio near unity throughout for CB's removes the discrepancy between the mean mass of single white dwarfs and the mean mass of white dwarfs in CB's. An evolutionary scheme for CB's based on present stellar evolution theories is sketched. According to this scheme, WUMa systems have probably to be excluded as possible progenitors of CB's. However, the typical configuration of a CB could easily be understood as the result of an evolution of type C of a close binary undergoing mass exchange during the primary's red giant phase, connected with substantial losses of mass and angular momentum from the system.

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