A Survey for Pulsating Hot B Subdwarfs in the Northern Hemisphere

Details A Survey for Pulsating Hot B Subdwarfs in the Northern Hemisphere A Survey for Pulsating Hot B Subdwarfs in the Northern Hemisphere

Oct 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...578..515b&link_type=abstract

The Astrophysical Journal, Volume 578, Issue 1, pp. 515-522.

Astronomy and Astrophysics

Astronomy

21

Stars: Interiors, Stars: Oscillations, Stars: Subdwarfs

Scientific paper

We present the final results of a survey to search for pulsating hot B subdwarf (sdB) stars. We picked our candidates on the basis of their values of Teff and logg, as estimated from available quantitative optical spectroscopy. With the help of a three-channel photometer, we gathered ``white-light'' light curves using a uniform sampling time of 10 s for a total of 74 stars. Our survey had a yield of ~5.4%, leading to the discovery of detectable luminosity variations in four objects: PG 1047+003, KPD 2109+4401, KPD 1930+2752, and PG 0014+067. For the light curves of the other 70 stars, we derive upper limits on the amplitudes of possible periodic signals (in the period window 20-1000 s) that range from ~0.05% of the mean brightness of the star at an apparent magnitude of y~12 to ~0.20% at y~15. We use our survey results as well as those of others to discuss the location and extent of the empirical instability ``strip'' for pulsating sdB stars in the logg-Teff diagram. We also address the question of the coexistence of pulsators and nonvariable stars in the same region of that diagram. Based in part on observations gathered at the Canada-France-Hawaii Telescope, operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique de France, and by the University of Hawaii.

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