Resolving the pulsations of subdwarf B stars: PG 0154+182, HS 1824+5745, and HS 2151+0857

Abstract

We continue our programme of extended single-site observations of pulsting subdwarf B (sdB) stars and present the results of extensive time series photometry to resolve the pulsation spectra for use in asteroseismological analyses. PG 0154+182, HS 1824+5745, and HS 2151+0857 were observed at the MDM Observatory during 2004 and 2005. Our observations are sufficient to resolve the pulsations of all three target stars. We extend the number of known frequencies for PG 0154+182 from one to six, confirm that HS 1824+5745 is a mono-periodic pulsator, and extend the number of known frequencies to five for HS 2151+0857. We perform standard tests to search for multiplet structure, measure amplitude variations as pertains to stochastic excitation, and examine the mode density to constrain the mode degree l.

arXiv comment10 pages; acceptable for publication in MNRAS

References in corpus (5)

• Structural Parameters of the Hot Pulsating B Subdwarf PG 1219+534 from Asteroseismology
• Internal rotation of subdwarf B stars: limiting cases and asteroseismological consequences
• Observations of the pulsating subdwarf B star Feige 48: Constraints on evolution and companions
• Detection of a companion to the pulsating sdB Feige 48
• Resolving the pulsations of the subdwarf B star KPD 2109+4401

Cited by in corpus (5)

• First Kepler results on compact pulsators I. Survey target selection and the first pulsators
• A survey for pulsating subdwarf B stars with the Nordic Optical Telescope
• First Kepler results on compact pulsators II: KIC 010139564, a new pulsating subdwarf B (V361 Hya) star with an additional low-frequency mode
• Resolving the pulsations of subdwarf B stars: HS 0039+4302, HS 0444+0458, and an examination of the group properties of resolved pulsators
• Time-series Spectroscopy and Photometry of the Pulsating Subdwarf B Star PG 1219+534 (KY UMa)