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Discovery of eleven new ZZ Ceti stars
B. G. Castanheira, S. O. Kepler, F. Mullally +8
We report the discovery of eleven new ZZ Cetis using telescopes at OPD (Observatório do Pico dos Dias/LNA) in Brazil, the 4.1 m SOAR (Southern Astrophysical Research) telescope at…
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…
The Dust cloud around the White Dwarf G 29-38
William T. Reach, Marc J. Kuchner, Ted von Hippel +4
We present new observations of the white dwarf G 29-38 with the camera (4.5 and 8 microns), photometer (24 microns), and spectrograph (5.5-14 microns) of the Spitzer Space Telescop…
Discovery of fourteen new ZZ Cetis with SOAR
S. O. Kepler, B. G. Castanheira, M. F. O. Saraiva +5
We report the discovery of fourteen new ZZ Cetis with the 4.1m Southern Astrophysical Research telescope, at Cerro Pachon, in Chile. The candidates were selected from the SDSS (Slo…
Measuring the evolution of the most stable optical clock G 117-B15A
S. O. Kepler, J. E. S. Costa, B. G. Castanheira +7
We report our measurement of the rate of change of period with time dP/dt for the 215 s periodicity in the pulsating white dwarf G 117-B15A, the most stable optical clock known. Af…
Eleven New DAVs from the Sloan Survey
F. Mullally, S. E. Thompson, B. G. Castanheira +5
We report the discovery of eleven new variable DA white dwarf (ZZ Ceti) stars. Candidates were selected by deriving temperatures from model fits to spectra obtained from the Sloan…