Volume 399, Number 1, February III 2003
|Page(s)||365 - 372|
|Published online||05 February 2003|
A search for period changes in δ Scuti stars with the super-LOTIS sky patrol system
Division of Physics, Mathematics and Astronomy, 105-24, California Institute of Technology, Pasadena, CA 91125, USA
2 Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA
3 Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA
4 Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
Corresponding author: C. Blake, Cblake@princeton.edu
Accepted: 5 November 2002
We have observed a sample of δ Scuti stars discovered by the ROTSE collaboration in 1999 with Super-LOTIS in order to characterize changes in their pulsation periods over a time baseline of roughly three years. Achieving these goals required the creation of an automated astrometric and photometric data reduction pipeline for the Super-LOTIS camera. Applying this pipeline to data from a June 2002 observing campaign, we detect pulsations in 18 objects, and find that in two cases the periods have changed significantly over the three years between the ROTSE and Super-LOTIS observations. Since theory predicts that evolutionary period changes should be quite small, sources of non-evolutionary period changes due to the interactions of pulsations modes are discussed.
Key words: stars: oscillations / stars: variables: δ Scuti / techniques: photometric
© ESO, 2003
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