Orbital period changes in cataclysmic variables?

Details Orbital period changes in cataclysmic variables? Orbital period changes in cataclysmic variables?

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136..250b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 2, July 1984, p. 250-254.

Astronomy and Astrophysics

Astrophysics

34

Cataclysmic Variables, Dwarf Novae, Eclipsing Binary Stars, Orbital Elements, Accretion Disks, Stellar Mass Ejection, Stellar Spectrophotometry

Scientific paper

The authors report observations of times of minima for four eclipsing cataclysmic variables: U Gem, EM Cyg, T Aur, and V2051 Oph. For all systems, no secular changes of the orbital period P were detected. The authors derived 3σ lower limits to the time constant τ = P/Pfor such changes of 1.4×108 years, 7.5×106 yr, 4.4×106 yr and 7.6×105 yr for U Gem, EM Cyg, T Aur, and V2051 Oph, respectively. The corresponding upper limits on the mean mass-transfer rate Mderived on the assumption of mass and angular momentum being conserved are still significantly above independent estimates of M, using accretion disk models. For U Gem the existence of quasiperiodic O-C variations with a time scale of ≡18 yr is confirmed.

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