O-C Analysis of the Intermediate Polar BG CMi

Details O-C Analysis of the Intermediate Polar BG CMi O-C Analysis of the Intermediate Polar BG CMi

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..335..355a&link_type=abstract

The Light-Time Effect in Astrophysics, Proceedings of ASP Conference Series, Vol. 335, held in Brussels 19-22 July 2004. Edited

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

Based on 1066 CCD observations obtained in 2002--2004 at the 1.8-m telescope of the Korean Astronomy observatory, the 15-min variability of BG CMi is analyzed. Moments and brigtness at 58 maxima and 63 minima are tabulated. The maxima correspond better to the cubic polynomial ephemeris of Garlick et al. (1994) then to the more recent quadratic model of Pych et al. (1996). The mean phase of maxima, according to the cubic ephemeris, is only 0.109±0.18, whereas the maxima for seasons 2002 and 2004 are in anti-phase, if computed using the quadratic ephemeris. A cycle miscount is possible, producing more complicated (e.g. cyclic) variations of the period. An apparent acceleration of the spin-up may be the result from changes of the equilibrium period, which are caused by variations of the magnetic field strength and/or orientation.

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