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The EC 14026 stars - V. The pulsation periods of PB 8783

O'Donoghue, D. and Koen, C. and Solheim, J.-E. and Barstow, M. A. and Dobbie, P. D. and O'Brien, M. S. and Clemens, J. C. and Sullivan, D. J. and Kawaler, S. D. (1998) The EC 14026 stars - V. The pulsation periods of PB 8783. Monthly Notices of the Royal Astronomical Society, 296 (2). pp. 296-305. ISSN 0035-8711. doi:10.1046/j.1365-8711.1998.01449.x.

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PB 8783 is a member of the newly discovered class of pulsating sdB stars, the EC 14026 stars. The potential of the pulsations of these stars as diagnostic probes of their interiors can only be realized fully by intensive campaigns of multisite time series photometry. To this end we have undertaken a campaign spanning 2 weeks and involving data from five different sites. 183 h of data were obtained. Frequency analysis yielded at least 11 pulsation periods in seven discrete groups between 94 and 136 s. Three of the periods in one specific group are equally spaced in frequency, with a spacing of 0.94 μHz. The frequency spacings amongst the members of other groups are similar to this. A rotation period of ~ 12 d is implied. A general scheme for identifying the observed modes is suggested. The periods from a detailed model are in good overall agreement with the observed periods, but some difficulties remain. Three additional periods in the range 61–63s, and with very low amplitude, were also found. No convincing interpretation of these could be devised.

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Additional Information:© 1998 RAS. Accepted 1998 January 5. Received 1997 October 7; in original form 1997 April 7. MAB and PPD acknowledge the support of the Particle Physics and Astronomy Research Council (PPARC). JES and MAB acknowledge the support of European Union grant CHRXCT 94-034 used to upgrade the La Palma photometer from two to three channels. JES thanks the European Union for travel and subsistance grants while observing. DJS thanks Mt John Observatory for the allocation of telescope time. SDK acknowledges support through the NASA Astrophysics Theory Program and the NSF Young Investigator Programs.
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Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
European UnionCHRXCT 94-03
Subject Keywords:binaries: close — stars: individual: PB 8783 — stars: oscillations
Issue or Number:2
Record Number:CaltechAUTHORS:20170408-200720076
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Official Citation:D. O'Donoghue, C. Koen, J.-E. Solheim, M. A. Barstow, P. D. Dobbie, M. S. O'Brien, J. C. Clemens, D. J. Sullivan, S. D. Kawaler; The EC 14026 stars — V. The pulsation periods of PB 8783, Monthly Notices of the Royal Astronomical Society, Volume 296, Issue 2, 11 May 1998, Pages 296–305,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76378
Deposited By: 1Science Import
Deposited On:30 Mar 2018 21:38
Last Modified:15 Nov 2021 16:59

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