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Time-Series Spectroscopy of EC 14026 Stars: Preliminary Results

Published online by Cambridge University Press:  12 April 2016

Simon J. O’Toole ,
Teresa C. Teixeira ,
Timothy R. Bedding  and
Hans Kjeldsen
Simon J. O’Toole
Affiliation:
Chatterton Astronomy Department, School of Physics, University of Sydney, NSW 2006, Australia
Teresa C. Teixeira
Affiliation:
Institute of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus C, Denmark
Timothy R. Bedding
Affiliation:
Chatterton Astronomy Department, School of Physics, University of Sydney, NSW 2006, Australia
Hans Kjeldsen
Affiliation:
Theoretical Astrophysics Center, University of Aarhus, DK-8000 Aarhus C, Denmark

Abstract

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We have obtained time-series spectra for the pulsating hot subdwarf (sdB) PG1605+072. Previous time-series photometry of this star has shown maximum amplitude variations of ∼0.1 mag and at least 50 periods. The pulsator has the largest amplitude and longest periods of all the pulsating sdBs (or EC 14026 stars) discovered so far, and appears to be unusual in its class. Preliminary results of a search for velocity variations are presented here. With these variations, along with equivalent width measurements, oscillation mode identification should be possible.

Type
Part 7. Pulsating White Dwarfs and Subdwarfs
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 519 - 520
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Koen, C., O’Donoghue, D., Kilkenny, D., Lynas-Gray, A.E., Marang, F., & van Wyk, F. 1998, MNRAS, 296, 317 CrossRefGoogle Scholar