Title: Four new subdwarf B pulsators
Authors: Ostensen, Roy ×
Heber, U
Silvotti, R
Solheim, JE
Dreizler, S
Edelmann, H #
Issue Date: Nov-2001
Publisher: E d p sciences
Series Title: Astronomy & astrophysics vol:378 issue:2 pages:466-476
Abstract: We report the detection of short period oscillations in the sdB stars HS 0039+4302, HS 0444+0408, HS 1824+5745 and HS 2151+0857 from time-series photometry made at the Nordic Optical Telescope (NOT) of a sample of 55 candidates. Hence these four hot subdwarfs are new members of the EC 14026 class of pulsating sdB stars. HS 0039+4302 is a multi-mode pulsator with at least four distinct periods in the range between 182 and 234 s, and amplitudes up to 8 mma. HS 0444+0408 shows one dominant pulsation at 137 s (A similar to 12 mma) and a second weaker pulsation at 170 s (A similar to 3 mma). For HS 1824+5745 we find a single period of 139 s with an amplitude of about 5 mma. HS 2151+0857 shows four periods in the range 129-151 s with amplitudes between 2 and 5 mma. Our NLTE model atmosphere analysis of the time-averaged optical spectra place all stars well within the theoretical sdBV instability strip.
ISSN: 0004-6361
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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