Gamma Doradus Stars: Defining a New Class of Pulsating Variables

Details Gamma Doradus Stars: Defining a New Class of Pulsating Variables Gamma Doradus Stars: Defining a New Class of Pulsating Variables

1999-05-05

arxiv.org/abs/astro-ph/9905042v1

Astronomy and Astrophysics

Astrophysics

15 pages, 1 ps figure. Accepted for publication in PASP

Scientific paper

10.1086/316399

In this paper we describe a new class of pulsating stars, the prototype of which is the bright, early, F-type dwarf, Gamma Doradus. These stars typically have between 1 and 5 periods ranging from 0.4 to 3 days with photometric amplitudes up to 0.1 in Johnson V. The mechanism for these observed variations is high-order, low-degree, non-radial, gravity-mode pulsation. Gamma Doradus stars exhibit variability on a time scale that is an order of magnitude slower than Delta Scuti stars. They may offer additional insight into stellar physics when they are better understood (e.g., they may represent the cool portion of an "iron opacity instability strip" currently formed by the Beta Cephei stars, the SPB stars, and the subdwarf B stars; they may also offer insight into the presence of g-modes in solar-like stars).

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