RATJ0455+1305: a rare hybrid pulsating subdwarf B star

We present results on the second faintest pulsating subdwarf B (sdB) star, RATJ0455+1305, derived from photometric data obtained in 2009. It shows both short- and long-period oscillations, theoretically assigned as pressure and gravity modes. We identify six short-period frequencies (with one being...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2011-02, Vol.411 (2), p.776-780
Main Authors: Baran, A. S, Gilker, J. T, Fox-Machado, L, Reed, M. D, Kawaler, S. D
Format: Article
Language:English
Subjects:
Astronomical research
Stars & galaxies
Online Access:Get full text
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Summary:We present results on the second faintest pulsating subdwarf B (sdB) star, RATJ0455+1305, derived from photometric data obtained in 2009. It shows both short- and long-period oscillations, theoretically assigned as pressure and gravity modes. We identify six short-period frequencies (with one being a combination) and six long-period frequencies. This star is the fourth hybrid sdB star discovered so far which makes it of special interest as each type of mode probes a different part of the star. This star is similar to the sdB hybrid pulsator Balloon090100001 in that it exhibits short-period mode groupings, which can be used to identify pulsation parameters and constrain theoretical models. [PUBLICATION ABSTRACT]
ISSN:0035-8711
1365-2966
DOI:10.1111/j.1365-2966.2010.17718.x