EDP Sciences
Free access
Issue
A&A
Volume 399, Number 1, February III 2003
Page(s) 365 - 372
Section Physical and chemical processes
DOI http://dx.doi.org/10.1051/0004-6361:20021676


A&A 399, 365-372 (2003)
DOI: 10.1051/0004-6361:20021676

A search for period changes in $\delta$ Scuti stars with the super-LOTIS sky patrol system

C. Blake1, 2, D. W. Fox1, H. S. Park3 and G. G. Williams4

1  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

(Received 17 September 2002 / Accepted 5 November 2002 )

Abstract
We have observed a sample of $\delta$ 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: $\delta$ Scuti -- techniques: photometric

Offprint request: C. Blake, Cblake@princeton.edu

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