Other
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200..563o&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 200, Aug. 1982, p. 563-583. Research supported by the University of Cap
Other
44
Astronomical Photometry, Stellar Oscillations, Variable Stars, White Dwarf Stars, Light Curve, Power Spectra
Scientific paper
Observations comprising 292 hr of high speed photometry of the low amplitude ZZ Ceti star L19-2 are reported. An adaptation of the method of power spectra of unequally-spaced data was devised to allow an efficient search for periodicities in the 105,000 data points. Five coherent oscillations were found, near 350, 192, 153, 118 and 113 sec periods; each of these has multiple components, the largest in each case have amplitudes of 1.0, 6.0, 0.55, 1.8 and 2.2 x 0.0022 mag, respectively. The 192 sec oscillation in the observations possesses three components equally separated in frequency. When combined with earlier observations, however, evidence is found for a small departure from equality, by an amount in accordance with recent calculations of the second-order rotational splitting of g-mode oscillations in white dwarfs. No period changes were detected over a 4.5 year baseline. This establishes L19-2 as another very stable pulsating white dwarf.
Odonoghue D. E.
Warner Brian
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