Permanent Superhumps in EY Cyg?

Details Permanent Superhumps in EY Cyg? Permanent Superhumps in EY Cyg?

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.1906c&link_type=abstract

American Astronomical Society Meeting 205, #19.06; Bulletin of the American Astronomical Society, Vol. 36, p.1371

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We report spectroscopic observations of the low-inclination dwarf nova EY Cyg, spanning eleven years. The radial velocity curves for both the emission and absorption components are determined for the first time. The orbital period is found to be 0.45932448(9) days, a value much larger than previously reported. The system inclination and, hence, the mass of each stellar component are estimated within very tight limits. In particular, we conclude that the mass of the white dwarf must be near the Chandrasekhar limit.
We also performed photometric observations, some of them simultaneous to the spectroscopic runs. The light curve shows oscillations with a period of 0.494027 days. Its deference with the orbital period is statistically significant and similar to the so-called "permanent superhumps" observed in shorter period dwarf novae. The significance of this phenomenon is analyzed.

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