On The Detection Of Periodic Variable Stars In The Explore II Database

Details On The Detection Of Periodic Variable Stars In The Explore II Database On The Detection Of Periodic Variable Stars In The Explore II Database

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.4408c&link_type=abstract

American Astronomical Society Meeting 208, #44.08; Bulletin of the American Astronomical Society, Vol. 38, p.119

Astronomy and Astrophysics

Astronomy

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Scientific paper

The EXPLORE (Extrasolar Planet Occulation Research) series of transit surveys uses 4m class telescopes to look for planetary transits in the Galactic plane (Mallen-Ornelas et al. 2003, ApJ, 582, 1123). The EXPLORE II search was carried out at the CFHT on 16 consecutive nights in December 2001-January 2002. Approximately 80,000 stars were identified in a field centered on the Galactic plane at l=203 degrees and b=0.85 degrees. Our investigation is based on an analysis of the observations of approximately 5500 of these stars on a total of 1950 frames.We used two period search methods (Fourier transform analysis and phase dispersion minimization) to identify periodic variable stars and derive their periods. As a result, 23 new variable stars have been discovered. This includes three binaries, three delta Scuti stars, one pulsating B star and sixteen variables of uncertain classification. Some of the unclassified variables are probably rotating stars that exhibit photometric variability because they have asymmetrically distributed starspots.To check on the success of our period searches, we inspected the individual light curve data for the 5500 stars and found that both methods were effective. In the future, we will apply these period search techniques to the remaining stars in the EXPLORE II database.Support from Science and Engineering research Canada (NSERC) and from a Clay Fellowship is gratefully acknowledged.

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