Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-06-14
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
18 pages, 6 figures, accepted for publication in the Astronomical Journal
Scientific paper
We report the discovery of oscillations in the hot subdwarf B star JL 166 from time-series photometry using the Goodman Spectrograph on the 4.1-m Southern Astrophysical Research Telescope. Previous spectroscopic and photometric observations place the star near the hot end of the empirical sdB instability strip and imply the presence of a cool companion. Amplitude spectra of the stellar light curve reveal at least 10 independent pulsation modes with periods ranging from 97 to 178 s and amplitudes from 0.9 to 4 mma. We adopt atmospheric parameters of T_eff = 34350 K and log g = 5.75 from a model atmosphere analysis of our time-averaged, medium-resolution spectrum.
Barlow Brad N.
Clemens James Christopher
Dunlap Bart H.
Lynas-Gray Anthony E.
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