Time Resolved Spectroscopy of the Pulsating sdB Star PG 1605+072

Abstract 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 yea...

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Bibliographic Details
Published in:International Astronomical Union Colloquium 2002, Vol.185, p.372-375
Main Authors: O’Toole, S.J., Bedding, T.R., Kjeldsen, H., Dall, T., Stello, D.
Format: Article
Language:English
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Summary:Abstract 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.
ISSN:0252-9211
DOI:10.1017/S0252921100016535