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Two New Variable Hot DQ Stars
B. N. Barlow, B. H. Dunlap, R. Rosen +1
We have discovered periodic variations in the light curves of two hot DQ stars from the Sloan Digital Sky Survey, SDSS J220029.08-074121.5 and SDSS J234843.30-094245.3. These are t…
Deciphering the Pulsations of G 29-38 with Optical Time Series Spectroscopy
Susan E. Thompson, M. H. van Kerkwijk, J. C. Clemens
We present optical time series spectroscopy of the pulsating white dwarf star G29-38 taken at the Very Large Telescope (VLT). By measuring the variations in brightness, Doppler shi…
A Quantitative Non-radial Oscillation Model for the Subpulses in PSR B0943+10
R. Rosen, J. Christopher Clemens
In this paper, we analyze time series measurements of PSR B0943+10 and fit them with a non-radial oscillation model. The model we apply was first developed for total intensity meas…
The pulsation modes of the pre-white dwarf PG 1159-035
J. E. S. Costa, S. O. Kepler, D. E. Winget +74
PG 1159-035, a pre-white dwarf with T_eff=140,000 K, is the prototype of both two classes: the PG1159 spectroscopic class and the DOV pulsating class. Previous studies of PG 1159-0…
Mean ZZ Ceti pulsation period gauges stellar temperature
Anjum S. Mukadam, M. H. Montgomery, A. Kim +3
The mean pulsation period of ZZ Ceti stars increases with decreasing effective temperature as we traverse from the blue to the red edge of the instability strip. This well-establis…
Mode Identification from Combination Frequency Amplitudes in ZZ Ceti Stars
Celeste M. Yeates, J. Christopher Clemens, S. E. Thompson +1
The lightcurves of variable DA stars are usually multi-periodic and non-sinusoidal, so that their Fourier transforms show peaks at eigenfrequencies of the pulsation modes and at su…