The Pulsation Properties of the Double-Mode RR Lyrae Variable
V79
in Messier 3
pdf ps
Christine M. Clement
Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON,
M5S 3H8, Canada
Mike Thompson
725 Ridgecrest Drive, Colfax, CA 95713
Received March 5, 2007; revised March 21, 2007; accepted March 22, 2007
Abstract: The double-mode RR Lyrae variable V79 in M3 was observed on seven
nights in April 2006 with a 14-inch Schmidt-Cassegrain telescope. A total of 275 CCD
frames were obtained. An analysis of these observations indicates that the first-
overtone period P1 was 0.3590 day, the fundamental period P0 was 0.4834 day, and
the amplitude ratio A1/A0 was 1.00 +/- 0.22. These results imply that the fundamental
period increased and that the strength of the fundamental mode oscillations relative
to the first-overtone may have increased since 1998 when the star was previously
observed. The data also indicate that the periods may fluctuate from cycle to cycle.
