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The EC 14026 stars -- X. A multi-site campaign on the sdBV star PG 1605+072

Citation

Kilkenny, D and Koen, C and O'Donoghue, D and van Wyk, F and Larson, KA and Shobbrook, R and Sullivan, DJ and Burleigh, MR and Dobbie, PD and Kawaler, SD, The EC 14026 stars -- X. A multi-site campaign on the sdBV star PG 1605+072, Royal Astronomical Society. Monthly Notices, 303, (3) pp. 525-534. ISSN 0035-8711 (1999) [Refereed Article]


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Copyright Statement

Copyright 1999 Royal Astronomical Society

DOI: doi:10.1046/j.1365-8711.1999.02256.x

Abstract

Results are reported from a multi-site photometric campaign on PG 1605+072, a member of the recently discovered class of pulsating hot subdwarfs, or EC 14026 stars. The main part of the campaign covered two weeks and produced ~ 180 h of photoelectric photometry from the five sites involved. Periodogram analysis shows that the light curve is dominated by five frequencies in the range 1.89-2.74 mHz (periods 529-365 s) with the main frequency at 2.075 76 mHz (481.75 s), though there appear to be more than 50 frequencies identifiable down to a semi-amplitude of 0.0007 (in fractional intensity) in the range 1.74-4.84 mHz (573-206 s). Compared with other pulsating sdB stars, the low gravity (log g = 5.25) and long periods indicate that the star has evolved away from the core helium-burning horizontal branch. A preliminary model of a post-horizontal-branch star with appropriate parameters yields many pulsation periods in the range 300-600 s, but detailed mode identification is not possible at present.

Item Details

Item Type:Refereed Article
Keywords:stars: individual: PG 1605+072; stars: oscillations; stars: variables: other
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Stellar Astronomy and Planetary Systems
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:81193
Year Published:1999
Web of Science® Times Cited:69
Deposited By:Mathematics and Physics
Deposited On:2012-11-26
Last Modified:2013-06-26
Downloads:0

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