Superhumps of CC Cancri Revisited
نویسندگان
چکیده
We observed the 2001 November superoutburst of CC Cnc. This observation makes the first detailed coverage of a superoutburst of this object. The best-determined mean superhump period is 0.075518±0.000018 d, which is 2.7% longer than the reported orbital period. This fractional superhump excess is a quite typical value for a normal SU UMa-type dwarf nova, excluding the previously raised possibility that CC Cnc may have an anomalously large fractional superhump excess. During the superoutburst plateau, the object showed a decrease of the superhump period at Ṗ /P = −10.2±1.3 × 10, which is one of the largest negative period derivative known in all SU UMa-type dwarf novae.
منابع مشابه
High level Ab inito bench mark computaions on weak interactions (H2)2 dimer revisited
The Potential Energy Surface PES of (H2)2 dimer has been investigated, using five simple rigid rotor models. These models are called: head to head, symmetric side to side, L , steplike and T model. All calculations were done at two levels of ab initio methods: MP2(Full) and QCISD (T,Full) using cc-pVTZ basis set at singlet state of spin multiplicity. The results of scanning PES were then fitte...
متن کاملSuperhumps Behavior during Normal Outbursts in ER UMa: Spectroscopy and Photometry
We have taken a 4-day spectroscopic observation and have been conducting a 13-day photometric study of the SU UMa-type dwarf nova, ER Ursae Majoris. The mean K-amplitude for the emission lines is 54± 8 km s and γ velocity is 8±4 km s from our spectroscopic results. A phase shift of 0.22 is also obtained. Our photometric observation confirms superhumps in normal outbursts of ER UMa and reconcile...
متن کاملUnusual Phase Reversal of Superhumps in ER Ursae Majoris
We studied the evolution of superhumps in the peculiar SU UMa-type dwarf nova, ER UMa. Contrary to the canonical picture of the SU UMa-type superhump phenomena, the superhumps of ER UMa show an unexpected phase reversal during the very early stage (∼5 d after the superoutburst maximum). We interpret that a sudden switch to so-called late superhumps occurs during the very early stage of a supero...
متن کاملFloquet analysis of disk instabilities and superhumps in Cataclysmic Variables
We analyze the dynamical stability of hydrodynamical flows in the equatorial plane of a thin axisymmetric accretion disk in close binary systems. The periodic tidal forces of the companion star induce parametric instabilities, which are characterized by the Floquet exponent. We propose that the onset of superhumps can be understood in this context. Comparing our model with well-known systems le...
متن کاملar X iv : a st ro - p h / 06 06 15 1 v 1 7 J un 2 00 6 Superhumps in Binary Systems and Their Connection to Precessional Spiral Density Waves
We consider a mechanism for the formation of superhumps in the TV Col system, based on the possible existence of a precessional spiral wave in the accretion disk of the system. This mechanism can act in binaries with arbitrary component-mass ratios, and our precessional spiral wave model can be applied to explain observed superhumps of all types.
متن کامل