Journal Article

RAT J0455+1305: a rare hybrid pulsating subdwarf B star

A. S. Baran, J. T. Gilker, L. Fox-Machado, M. D. Reed and S. D. Kawaler

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 2, pages 776-780
Published in print February 2011 | ISSN: 0035-8711
Published online February 2011 | e-ISSN: 1365-2966 | DOI:
RAT J0455+1305: a rare hybrid pulsating subdwarf B star

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We present results on the second faintest pulsating subdwarf B (sdB) star, RAT J0455+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 Balloon 090100001 in that it exhibits short-period mode groupings, which can be used to identify pulsation parameters and constrain theoretical models.

Keywords: astroseismology; subdwarfs

Journal Article.  3601 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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