Other
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279l..15w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 279, April 1, 1984, p. L15-L17.
Other
21
Light Curve, Stellar Oscillations, Variable Stars, White Dwarf Stars, Stellar Spectrophotometry
Scientific paper
It has been found that the DB white dwarf PG 1654+160 is a pulsating variable star, and thereby the second member of the class of pulsating DB white dwarfs. The photometric properties of PG 1654+160 resemble those of the other variable in the class, GD 358: the light curve is at least quasi-periodic, with a typical pulse interval of about 560 s; the maximum amplitude reached is nearly 0.2 mag; and power spectra of its light curve show many periods between 148.5 s and 851 s. As with GD 358, the power is concentrated at low frequencies, in particular near 578 s and 851 s. PG 1654+160 was selected from DB white dwarfs in the Palomar-Green survey on the basis of the unusually strong and broad He I lines present in its optical spectrum. The success of this selection criterion strongly suggests that the variability of the pulsating DB white dwarfs is associated with the helium opacity maximum as predicted by theory.
Balachandran Shankar
Edward Nather R.
Robinson Emma L.
Winget Don E.
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