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New WET Observations of the δ Scuti Star CD-24 7599: amplitude variability and discovery of 13 pulsation modes

Published online by Cambridge University Press:  12 April 2016

G. Handler ,
D. O’Donoghue ,
D. A. H. Buckley ,
O. Giovannini ,
S. O. Kepler ,
J. L. Provencal ,
M. A. Wood ,
J. C. Clemens ,
M. S. O’Brien  and
S. J. Kleinman
...Show all authors
G. Handler
Affiliation:
Institut für Astronomie, Türkenschanzstraβe 17, A-1180 Wien, Austria
D. O’Donoghue
Affiliation:
Department of Astronomy, University of Cape Town, Rondebosch 7700, South Africa
D. A. H. Buckley
Affiliation:
South African Astronomical Observatory, P. O. Box 9, Observatory 7935, South Africa
O. Giovannini
Affiliation:
Instituto de Fisica, Universidade Federal do Rio Grande do Sul, 90049 Porto Alegre-RS, Brazil
S. O. Kepler
Affiliation:
Instituto de Fisica, Universidade Federal do Rio Grande do Sul, 90049 Porto Alegre-RS, Brazil
J. L. Provencal
Affiliation:
Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
M. A. Wood
Affiliation:
Department of Physics and Space Sciences, Florida Institute of Technology, 150 W. University Boulevard, Melbourne, FL 32901, USA
J. C. Clemens
Affiliation:
Department of Physics and Astronomy, Iowa State University, Ames, IA 50211, USA
M. S. O’Brien
Affiliation:
Department of Physics and Astronomy, Iowa State University, Ames, IA 50211, USA
S. J. Kleinman
Affiliation:
Department of Astronomy and McDonald Obs., University of Texas, Austin, TX 78712, USA
T. K. Watson
Affiliation:
Department of Astronomy and McDonald Obs., University of Texas, Austin, TX 78712, USA
R. E. Nather
Affiliation:
Department of Astronomy and McDonald Obs., University of Texas, Austin, TX 78712, USA
D. E. Winget
Affiliation:
Department of Astronomy and McDonald Obs., University of Texas, Austin, TX 78712, USA
A. Kanaan
Affiliation:
Department of Astronomy and McDonald Obs., University of Texas, Austin, TX 78712, USA
A. Nitta
Affiliation:
Department of Astronomy and McDonald Obs., University of Texas, Austin, TX 78712, USA
M. H. Montgomery
Affiliation:
Department of Astronomy and McDonald Obs., University of Texas, Austin, TX 78712, USA
E. Klumpe
Affiliation:
Department of Astronomy and McDonald Obs., University of Texas, Austin, TX 78712, USA
P. A. Bradley
Affiliation:
X-2 MS B-220, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
D. J. Sullivan
Affiliation:
Department of Physics, Victoria University of Wellington, New Zealand
K. Wu
Affiliation:
RCfTA, School of Physics, University of Sydney, NSW 2006, Australia
E. Leibowitz
Affiliation:
Department of Physics and Astronomy, University Tel Aviv, Tel Aviv 69978, Israel

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The variability of CD-24 7599 (V=11.48 mag) was discovered by JCC during observing run XCOV7 of the Whole Earth Telescope (WET, Nather et al. 1990) network in February, 1992. The star was observed as an additional target and 117 hours of high-quality temporal spectroscopic observations were obtained.

Our analysis of these data revealed the presence of 7 independent pulsation modes between 27.0 and 38.1 cycles per day (313 – 441 μHz) with semiamplitudes of 2.1 – 10.2 milli-modulation amplitudes (mma). We showed that peaks at linear combination frequencies detected in the power spectra were not due to eigenmodes excited to visible amplitude by resonant mode coupling.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 155: Astrophysical Applications of Stellar Pulsation , 1995 , pp. 331 - 332
Copyright
Copyright © Astronomical Society of the Pacific 1995

References

Handler, G., Breger, M., Sullivan, D.J., et al. 1995, A&A, submittedGoogle Scholar
Nather, R.E., Winget, D.E., Clemens, J.C., Hansen, C.J., & Hine, B.P. 1990, ApJ, 361, 309 Google Scholar