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Paper: The Near-Synchronous Polar Candidate V4633 Sgr (Nova Sagittarii 1998)
Volume: 315, Magnetic Cataclysmic Variables (IAU Colloquium 190)
Page: 176
Authors: Lipkin, Y.; Leibowitz, E.M.
Abstract: The classical nova V4633 Sgr (1998) exhibits two photometric periodicities. The shorter period (P1=3.01 hr) is stable, while the other one, longer by ∼2.5%, has decreased monotonically since shortly after the nova eruption, with dP2/dt ≈ -10-6 (Lipkin et al. 2001).

Here we report on results of photometric monitoring of the star in 2001 and 2002. During our observations, the longer period decreased more, and in 2002 it was only 1.8% longer than P1. The decrease rate (dP2/dt) in 2001-2002 was an order of magnitude smaller than in 1998-2000.

These new results support the Near-Synchronous Polar classification which was suggested for V4633 Sgr (Lipkin et al. 2001). In this model, the longer period of V4633 Sgr is the spin of the white dwarf, and its variation since 1998 reflects changes in the moment of inertia of the white dwarf, and angular momentum transfer in the system following the nova eruption.
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