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**Session 27 - Variable Stars, Novae, & Supernovae.**

*Display session, Tuesday, June 10*

*South Main Hall, *

## [27.02] A Light Curve Analysis of the Cataclysmic Variable AR Cancri

*H. J. Leckenby, J. B. Rafert (Michigan Technological U.)*
Photometric data (Howell 1989) for the cataclysmic
variable AR Cnc were analyzed using the Wilson-Devinney
differential corrections program. The three light curves
(two in B and one in V) were studied to find a consistent
set of geometrical and astrophysical parameters which
provided the best weighted least-squares fit to the data.
Free parameters included inclination (i), the temperature
of the secondary (T2), potential of the primary (omega 1),
mass ratio (q), luminosity of the primary (L1), and third
light (l3). Lack of definitive spectroscopy for the primary
component further complicated the solution as it was
necessary to assume a primary temperature of 20,000K based
on limitations cited for similar systems such as DV UMa.
Nonetheless, calculated temperatures for the secondary
(which are correlated to the assumed temperature of the
primary) lay in the expected range for the cited M$ spectral
classification of the secondary component. Physical
conditions of the system such as the faintness of the
system, and hence the rms variations in the observations,
and the narrowness and depth of primary eclipse strongly
controlled the selection of parameter subsets in the
differential corrections sequence. This is also discussed
with the light curve analysis.

References: Howell, S. et al, 1989 PASP, 102, 758-772

The author(s) of this abstract have provided an email address for comments about the abstract: hjlecken@mtu.edu

**Program
listing for Tuesday**