A search for pulsations among low-mass DAO white dwarfs

Details A search for pulsations among low-mass DAO white dwarfs A search for pulsations among low-mass DAO white dwarfs

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...339..170h&link_type=abstract

Astronomy and Astrophysics, v.339, p.170-172 (1998)

Astronomy and Astrophysics

Astrophysics

8

White Dwarfs, Stars: Oscillations

Scientific paper

We performed a search for periodic light variations among low-mass DAO white dwarfs. These objects have theoretically been predicted to exhibit low-order g-mode pulsations due to a potent epsilon mechanism in hydrogen-burning shells according to model calculations of Charpinet et al. (1997). No pulsations were detected in any of our nine candidate stars. This can be attributed to the very narrow instability strip predicted or to the fact that pulsationally unstable modes are not necessarily excited, a common phenomenon among pulsating stars. It may also be the case that hydrogen-burning shells in the stars are too small to drive pulsations or not present.

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