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Title: PG1325+101 and PG2303+019: Two new large amplitude subdwarf B pulsators
Authors: Silvotti, R ×
Ostensen, Roy
Heber, U
Solheim, JE
Dreizler, S
Altmann, M #
Issue Date: Feb-2002
Publisher: E d p sciences
Series Title: Astronomy & astrophysics vol:383 issue:1 pages:239-243
Abstract: We report the detection of short period oscillations in the sdB stars PG1325+101 (B = 13.8) and PG2303+019 (alias HS 2303+0152, B = 16.0) from time-series photometry made at the Nordic Optical Telescope of a sample of 21 candidates. Both stars are multi-mode pulsators with at least three distinct periods in the range 100-140 s, and relatively large amplitudes up to 2.6 and 1.6% respectively. Moreover PG1325+101 shows the shortest pulsation period ever registered among sdBV stars, 68.9 s, which corresponds to the first harmonic of the main signal. Following previous temperature and gravity determinations for PG1325+101 (T-eff = 34 500 K, log g = 6.1) and our NLTE model atmosphere analysis for PG2303+019 (T-eff = 35 200 K, log g = 5.7), both stars are well inside 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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