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SDSS J184037.78+642312.3: the First Pulsating Extremely Low Mass White Dwarf
(2012-05)
We report the discovery of the first pulsating extremely low mass (ELM) white dwarf (WD), SDSS J184037.78+642312.3 (hereafter J1840). This DA (hydrogen-atmosphere) WD is by far the coolest and the lowest-mass pulsating WD, ...
The Pulsation Modes Of The Pre-White Dwarf PG 1159-035
(2008-01)
Context. PG 1159-035, a pre-white dwarf with T-eff similar or equal to 140000 K, is the prototype of both two classes: the PG 1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-035 photometric ...