AAS 204th Meeting, June 2004
Session 6 Stars: Winkin' and Blinkin'
Poster, Monday, May 31, 2004, 9:20am-6:30pm, Ballroom

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[6.07] First Spectroscopic Detection of Pulsational Modes in a Long Period Subdwarf B Star Variable

B.-Q. For, E.M. Green (Steward Observatory, University of Arizona), D. O'Donoghue (South African Astronomical Observatory), L. Kiss, T.R. Bedding (School of Physics, University of Sydney), E.A. Hyde (Steward Observatory, University of Arizona), S.J. O'Toole (School of Physics, University of Sydney)

During March--July 2003, we obtained 1.8A resolution time-series spectra of the subdwarf B star variable PG1627+017, as part of a multiple site spectroscopic campaign. This target was selected because it is the brightest and has the highest amplitude variations among the recently discovered long period subdwarf B pulsators. It is also the coolest known example of this new class of pulsators, which, as a group, are cooler than the previously discovered short period subdwarf B star pulsators (i.e. the EC14026 stars). We present preliminary radial velocity (RV) mode detections and wavelength dependent amplitude variations of PG1627+017. At least two modes have been detected in the RV power spectrum. This is the first spectroscopic detection of pulsational modes in a long period subdwarf B star.

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Bulletin of the American Astronomical Society, 36 #2
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