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Time Resolved Spectroscopy of PG 1605+072: Lastest Results
S. J. O'Toole1, T. R. Bedding1, H. Kjeldsen2 and
M. A. S. G. Jorgensen3
1School of Physics, University of Sydney 2006, Australia
2Theoretical Astrophysics Center, Aarhus University, DK-8000, Aarhus C, Denmark 3Universtiy of Copenhagen, Astronomical Observatory, Juliane Maries Vej 30, DK-2100, Copenhageno, Denmark
We present the latest results from our analysis of time resolved spectroscopy of PG 1605+072, a high amplitude pulsating sdB star. The star is believed to have evolved off the extreme horizontal branch, and it is uncertain whether it pulsates in p- or g-modes. Previous studies of PG 1605+072 have found amplitude variation and/or very closely spaced frequencies. We compare our velocity measurements with new simultaneous spectrophotometric measurements and analyse phase differences for the 8 frequencies found in velocity. Phase differences between velocity, spectrophotometry and equivalent width are discussed. Finally, a possible explanation for the unusual equivalent width variations in the Balmer lines is also presented.
Last changed: 2002/Jun/25
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