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

Details RAT J0455+1305: A rare hybrid pulsating subdwarf B star RAT J0455+1305: A rare hybrid pulsating subdwarf B star

2011-03-08

arxiv.org/abs/1103.1600v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

published in MNRAS

Scientific paper

We present results on the second-faintest pulsating subdwarf B (sdB) star known, RAT J0455+1305, derived from photometric data obtained in 2009. It shows both short and long periods 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.

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