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Time Resolved Spectroscopy of the Pulsating sdB Star PG 1605+0721

Published online by Cambridge University Press:  12 April 2016

S.J. O’Toole ,
T.R. Bedding ,
H. Kjeldsen ,
T. Dall  and
D. Stello
S.J. O’Toole
Affiliation:
School of Physics, University of Sydney, Australia
T.R. Bedding
Affiliation:
School of Physics, University of Sydney, Australia
H. Kjeldsen
Affiliation:
Theoretical Astrophysics Center, Aarhus University, Denmark
T. Dall
Affiliation:
Institute of Physics and Astronomy, Aarhus University, Denmark
D. Stello
Affiliation:
Institute of Physics and Astronomy, Aarhus University, Denmark

Abstract

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We present analysis of rapid spectroscopy of PG 1605+072, a pulsating sdB star that is believed to have evolved off the extreme horizontal branch. Using a cross-correlation technique on five Balmer lines (Hβ to H8), we have been able to study the Doppler variations in this star over one year. Preliminary results for about 25% of the time-series were presented by O’Toole et al. (2000). We find evidence for amplitude variation between 1999 and 2000. We have also examined of equivalent widths of the Balmer lines looking for variation. Preliminary results are intriguing, with the amplitude of the equivalent width oscillations strongly dependent on wavelength.

Type
Part 2.5. Pulsations in Compact Objects
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 372 - 375
Copyright
Copyright © Astronomical Society of the Pacific 2002

Footnotes

1

Based on observations made with the Danish 1.54 m telescope at ESO, La Silla, Chile, and on observations made with the Nordic Optical Telescope, operated on the island of La Palma jointly by Denmark, Finland, Iceland, Norway and Sweden in the Spanish Observatorio del Roque de Los Muchachos of the Instituto de Astrofisica de Canarias.

References

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