SIMBAD references

2009MNRAS.399.1534C - Mon. Not. R. Astron. Soc., 399, 1534-1538 (2009/November-1)

SY Cnc, a case for unstable mass transfer{quest}.


Abstract (from CDS):

Intermediate-resolution (0.5-1 Å) optical spectroscopy of the cataclysmic variable (CV) SY Cnc reveals the spectrum of the donor star. Our data enable us to resolve the orbital motion of the donor and provide a new orbital solution, binary mass ratio and spectral classification. We find that the donor star has spectral-type G8±2 V and orbits the white dwarf with P = 0.3823753 ±0.0000003 d, K2= 88.0±2.9 km/s and V sini = 75.5 ±6.5 km/s. Our values are significantly different from previous works and lead to q = M2/M1= 1.18±0.14. This is one of the highest mass ratios known in a CV and is very robust, because it is based on resolving the rotational broadening over a large number of metallic absorption lines. The donor could be a slightly evolved main sequence or descendant from a massive star which underwent an episode of thermal time-scale mass transfer.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): accretion, accretion discs - stars: individual: SY Cnc - novae, cataclysmic variables

Simbad objects: 14

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