منابع مشابه
Simulations of superhumps and superoutbursts
We numerically study the tidal instability of accretion discs in close binary systems using a two-dimensional SPH code. We find that the precession rate of tidally unstable, eccentric discs does not only depend upon the binary mass ratio q. Although the (prograde) disc precession rate increases with the strength of the tidal potential, we find that increasing the shear viscosity ν also has a si...
متن کاملNew Interpretation of Superhumps
Received ABSTRACT Observational evidence is presented for periodically variable irradiation of secondary components. This results in strongly modulated mass outflow. Superhumps are then due to enhanced dissi-pation of the kinetic energy of the stream. Qualitative interpretation of superhump periods and their variations is also presented.
متن کاملSuperhumps: Confronting Theory with Observation
We review the theory and observations related to the “superhump” precession of eccentric accretion discs in close binary sytems. We agree with earlier work, although for different reasons, that the discrepancy between observation and dynamical theory implies that the effect of pressure in the disc cannot be neglected. We extend earlier work that investigates this effect to include the correct e...
متن کاملCounting Humps and Peaks in Generalized Dyck Paths
Let us call a lattice path in Z × Z from (0, 0) to (n, 0) using U = (1, k), D = (1,−1), and H = (a, 0) steps and never going below the x-axis a (k, a)-path (of order n). A super (k, a)-path is a (k, a)-path which is permitted to go below the x-axis. We relate the total number of humps in all of the (k, a)paths of order n to the number of super (k, a)-paths, where a hump is defined to be a seque...
متن کاملSuperhumps of CC Cancri Revisited
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 possibil...
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ژورنال
عنوان ژورنال: Nature
سال: 1984
ISSN: 0028-0836,1476-4687
DOI: 10.1038/309751a0