Detection of Photometric Variations in the sdBV Star JL 166
B.N Barlow, B.H. Dunlap, A.E. Lynas-Gray, J.C. Clemens
TL;DR
This paper reports the discovery of multiple pulsation modes in the hot subdwarf B star JL 166 through time-series photometry, revealing its oscillatory behavior and contributing to understanding sdB star variability.
Contribution
The study presents the first detection of oscillations in JL 166, identifying at least 10 pulsation modes, which enhances knowledge of pulsations in hot subdwarf B stars.
Findings
At least 10 pulsation modes detected
Pulsation periods range from 97 to 178 seconds
Amplitudes from 0.9 to 4 mma
Abstract
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.
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