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PG 1456 + 103 - A new pulsating DB white dwarf

1988; Institute of Physics; Volume: 95; Linguagem: Inglês

10.1086/114684

1538-3881

A. D. Grauer, Howard E. Bond, Richard F. Green, James Liebert,

Gamma-ray bursts and supernovae

High-speed photometry presented in this paper demonstrates that the helium-rich white dwarf PG 1456 + 103 is a pulsating star. The three or four major periodicities present in its light curves range from 423 to 854 s, with amplitudes between 8.5 and 21 millimag. Upper amplitude limits for periods outside of this range (60-2000 s) are calculated to be on the order of 4 millimag from the data. PG 1456 + 103 is the fifth member of the DBV class of variable white dwarfs. It has been shown based on the IUE energy distribution to have a temperature (approximately 24,000 K) consistent with the temperature range for members of this group.