Two new variable white dwarfs - G185-32 and G191-16

Details Two new variable white dwarfs - G185-32 and G191-16 Two new variable white dwarfs - G185-32 and G191-16

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..349m&link_type=abstract

Astrophysical Journal, Part 1, vol. 250, Nov. 1, 1981, p. 349-354. Research supported by the Natural Sciences and Engineering R

Astronomy and Astrophysics

Astrophysics

35

Stellar Spectrophotometry, Variable Stars, White Dwarf Stars, Light Curve, Periodic Variations, Power Spectra, Stellar Spectra, Stellar Structure, Stellar Temperature

Scientific paper

The discovery of two new ZZ Ceti variables, originally selected as candidates for variability on the basis of their (G-R) colors is reported. The star G191-16 is a stable, large-amplitude variable showing several periods and significant nonlinear effects in its light curve. The star G185-32 is a much smaller amplitude multiply periodic variable. The period structures of both stars act as counter-examples to the accepted correlation for the ZZ Ceti variables between pulsation amplitude and period-structure complexity. Thus far, 10 ZZ Ceti stars are found in the range between -0.45 and -0.38, and no constant DA dwarfs have yet been discovered in this interval. This implies that the ratio of constant to variable DA stars in the temperature range in which the variables occur is very much smaller than indicated by previous surveys.

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