Two new variable white dwarfs - G185-32 and G191-16
Citations Over Time
Abstract
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.
Related Papers
- → Fourier coefficients of variable stars. II - Light-curve analysis(1987)18 cited
- → Light curve analysis of rotating variable stars(1986)1 cited
- Asteroseismology of White Dwarf Stars(1997)
- → Comparison of Mean Light Curve Parameters of M, S and C Mira and Semi-Regular Variable Stars Using 75 Years of AAVSO Data(2000)
- Light Curve Analysis of Variable Stars in the SmallMagellanic System(2018)