SIMBAD references

2012MNRAS.421.2310A - Mon. Not. R. Astron. Soc., 421, 2310-2315 (2012/April-2)

Two photometric periods in the AM CVn system CP Eridani.

ARMSTRONG E., PATTERSON J. and KEMP J.

Abstract (from CDS):

We report photometric periodicities in the AM CVn system CP Eridani (CP Eri) of 1716.2±0.2 and 1701.4±0.2 s, obtained while the system was in quiescence. From a second observation obtained during superoutburst, we interpret the 1716-s signal as a superhump period (Psh) and the 1701-s signal as the orbital period (Porb) of the binary. The derived fractional superhump period excess ε adds CP Eri to a small collection of AM CVn stars with ε measured via time-series photometry of superhump and orbital periods. Plotting ε(Porb) for these systems, we find that AM CVn systems may, as expected, be evolving towards longer Porb. We discuss a technique of using ε to determine the degree of degeneracy of the donor star in a contact binary, and we show that for the AM CVn systems, the donor stars are well described by mass–radius relations of partially-degenerate objects.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): accretion, accretion discs - binaries: close - stars: individual: CP Eridani - novae, cataclysmic variables - white dwarfs

Simbad objects: 10

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