On the origin and evolutionary state of RZ Cas, KO Aql and S Equ

Details On the origin and evolutionary state of RZ Cas, KO Aql and S Equ On the origin and evolutionary state of RZ Cas, KO Aql and S Equ

2008-02-07

arxiv.org/abs/0802.0944v3

A&A 486, 919--921 (2008)

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, accepted for publication in A&A; accepted version

Scientific paper

10.1051/0004-6361:200809530

Aims. Determination of the present evolutionary state and the restrictions on the initial mass ratios of RZ Cas, KO Aql and S Equ. Methods. Comparison of mass gaining stars with evolutionary models of single stars with the same mass and subsequent comparison with accretion tracks from simultaneous conservative binary evolution. Results. The gainers are in an early main sequence stage (Xc greater than 0.5), with KO Aql being almost unevolved (assuming quasi-thermal equilibrium). The initial donor/gainer mass ratios Mdi/Mgi must be larger than three to obtain the present mass and luminosity of the gainers.

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