Period stability of the pulsating white dwarf R548 /=ZZ Ceti/

Details Period stability of the pulsating white dwarf R548 /=ZZ Ceti/ Period stability of the pulsating white dwarf R548 /=ZZ Ceti/

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...240..865s&link_type=abstract

Astrophysical Journal, Part 1, vol. 240, Sept. 15, 1980, p. 865-870.

Astronomy and Astrophysics

Astrophysics

29

Periodic Variations, Stellar Spectrophotometry, Variable Stars, White Dwarf Stars, Amplitudes, Colorimetry, Light Curve, Prediction Analysis Techniques, Time Response

Scientific paper

R548 is a pulsating DA white dwarf and the prototype of the ZZ Ceti class of variable stars. R548 is pulsating in four pulsation modes simultaneously, the pulsations having periods of212.77, 213.13, 274.25, and 274.77 s. We have combined all of the high-speed photometry of R548 acquired at McDonald and Cerro Tololo Inter-American Observatories. The data, which now cover the years from 1970 to 1978, demonstrate that the properties of the pulsations have remained remarkably constant during this time. There have been no detectable changes in either the pulsation periods or the amplitudes. The upper limit on the rate of change of the period of the 213.13 s pulsation is 2 × 10-13 s s-1, which gives this pulsation the most stable period ever measured for a variable star at visual wavelengths.

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