SY Cnc, a case for unstable mass transfer?

Bibcode
2009MNRAS.399.1534C
DOI
10.1111/j.1365-2966.2009.15384.x
Casares, J.; Martínez-Pais, I. G.; Rodríguez-Gil, P.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 399, Issue 3, pp. 1534-1538.

Advertised on:
11
2009
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
3
IAC number of authors
3
Citations
6
Refereed citations
6
Description
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 kms-1 and V sini = 75.5 +/- 6.5 kms-1. 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.
Type
Refereed
Accretion
Novae

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