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

Blake, C. and Fox, D. W. and Park, H. S. and Williams, G. G. (2003) A search for period changes in δ Scuti stars with the super-LOTIS sky patrol system. Astronomy & Astrophysics, 399 (1). pp. 365-372. ISSN 0004-6361.

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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.

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Fox, D. W.0000-0002-3714-672X
Additional Information:© 2003 ESO. Received: 17 September 2002. Accepted: 5 November 2002. The authors would like to acknowledge Professor Shri Kulkarni's crucial role in enabling this collaboration and his financial support. The authors would also like to thank Edo Berger and Alicia Soderberg for assistance with the multi-color observations of ROTSE 4861, and the referee, Torben Arentoft, for his careful reading of the original manuscript and his detailed comments. CB would like to acknowledge the support of the Caltech SURF program during the completion of this work. Support for this work was provided through Professor Kulkarni via NSF grant AST-0098676 and STSCI grant HST-GO-09180.01-A under NASA Contract NAS5-26555. This work was performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under contract No. W-7405-ENG-48 and NASA contract S-03975G. The Guide Star Catalog-II is a joint project of the Space Telescope Science Institute and the Osservatorio Astronomico di Torino. Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, for the National Aeronautics and Space Administration under contract NAS5-26555. The participation of the Osservatorio Astronomico di Torino is supported by the Italian Council for Research in Astronomy. Additional support is provided by European Southern Observatory, Space Telescope European Coordinating Facility, the International GEMINI project and the European Space Agency Astrophysics Division.
Funding AgencyGrant Number
Department of Energy (DOE)W-7405-ENG-48
Italian Council for Research in AstronomyUNSPECIFIED
European Southern Observatory (ESO)UNSPECIFIED
Space Telescope European Coordinating FacilityUNSPECIFIED
International GEMINI projectUNSPECIFIED
European Space Agency (ESA)UNSPECIFIED
Subject Keywords:stars: oscillations - stars: variables: δ Scuti - techniques: photometric
Issue or Number:1
Record Number:CaltechAUTHORS:20180228-105422824
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Official Citation:A search for period changes in δ Scuti stars with the super-LOTIS sky patrol system C. Blake, D. W. Fox, H. S. Park and G. G. Williams A&A, 399 1 (2003) 365-372 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85008
Deposited By: Ruth Sustaita
Deposited On:28 Feb 2018 20:03
Last Modified:03 Oct 2019 19:25

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