Time-resolved spectroscopy and spectrophotometry of the pulsating sdB star PG 1605+072

Details Time-resolved spectroscopy and spectrophotometry of the pulsating sdB star PG 1605+072 Time-resolved spectroscopy and spectrophotometry of the pulsating sdB star PG 1605+072

2002-10-17

arxiv.org/abs/astro-ph/0210395v1

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, to appear in "Asteroseismology Across the HR Diagram" (Porto, July 2002), Eds. Thompson M.J., Cunha M.S. a

Scientific paper

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.

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