Messages from the Core: Excited Gravity Modes in the Nearby Blue Supergiant Star Rigel (βOri)

Details Messages from the Core: Excited Gravity Modes in the Nearby Blue Supergiant Star Rigel (βOri) Messages from the Core: Excited Gravity Modes in the Nearby Blue Supergiant Star Rigel (βOri)

2011-09-28

arxiv.org/abs/1109.6071v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

2 pages, To appear in "Transiting planets, vibrating stars & their connection Proceedings of the 2nd CoRoT symposium (14 - 17

Scientific paper

Rigel is a bright nearby B8 Ia supergiant star. We observed Rigel for 27.7 days with the MOST satellite and monitored it's optical spectrum for over 6 years. Radial velocity (RV hereafter) curve manifestly calls for tens of modes for prewhitening. We conservatively report on the first 19 significant modes to avoid misdetection of aliases. The variability periods range from about 75 days down to a day. All radial modes are stable. We speculate the presence of gravity-dominated mixed-modes excited by \epsilon-mechanism from the Hydrogen burning shell on top of He burning core.

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