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V391 Peg: Identification of the two main pulsation modes from ULTRACAM u ' g ' r ' amplitudes
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Silvotti, R., Randall, S. K., Dhillon, V. S., Marsh, T. R., Savoury, C. D., Schuh, S., Fontaine, G. and Brassard, P. (2010) V391 Peg: Identification of the two main pulsation modes from ULTRACAM u ' g ' r ' amplitudes. In: 4th HELAS International Conference, Canary Islands, Spain, 1-05 Feb 2010. Published in: Astronomische Nachrichten, Vol.331 (No.9-10). pp. 1034-1037. doi:10.1002/asna.201011451 ISSN 0004-6337.
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Official URL: http://dx.doi.org/10.1002/asna.201011451
Abstract
V391 Peg (HS 2201+2610) is an extreme horizontal branch subdwarf B (sdB) star, it is an hybrid pulsator showing p- and g-mode oscillations, and hosts a 3.2/sin i M-Jup planet at an orbital distance of about 1.7 AU. In order to improve the characterization of the star, we measured the pulsation amplitudes in the u'g'r' Sloan photometric bands using ULTRACAM at the William Herschel 4.2m telescope and we compared them with theoretical values. The preliminary results presented in this article conclusively show that the two main pulsation periods at 349.5 and 354.1 s are a radial and a dipole mode respectively. This is the first time that the degree index of multiple modes has been uniquely identified for an sdB star as faint as V391 Peg (B = 14.4), proving that multicolor photometry is definitely an efficient technique to constrain mode identification, provided that the data have a high enough quality. C() 2010 WILEY-VCH Verlag GmbH&Co. KGaA, Weinheim
| Item Type: | Conference Item (Paper) | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Astronomische Nachrichten | ||||
| Publisher: | Wiley - V C H Verlag GmbH & Co. KGaA | ||||
| ISSN: | 0004-6337 | ||||
| Official Date: | December 2010 | ||||
| Dates: |
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| Volume: | Vol.331 | ||||
| Number: | No.9-10 | ||||
| Number of Pages: | 4 | ||||
| Page Range: | pp. 1034-1037 | ||||
| DOI: | 10.1002/asna.201011451 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Conference Paper Type: | Paper | ||||
| Title of Event: | 4th HELAS International Conference | ||||
| Type of Event: | Conference | ||||
| Location of Event: | Canary Islands, Spain | ||||
| Date(s) of Event: | 1-05 Feb 2010 |
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