Twins: The Two Shortest Period Non-Interacting Double Degenerate White Dwarf Stars (2009)
Mullally, F., Badenes, Carles, Thompson, Susan E., Lupton, Robert
We report on the detection of the two shortest period non-interacting white dwarf binary systems. These systems, SDSS J143633.29+501026.8 and SDSS J105353.89+520031.0, were identified by searching...
Badenes, Carles, Mullally, Fergal, Thompson, Susan E., Lupton, Robert H.
We present the first results from SWARMS (Sloan White dwArf Radial velocity data Mining Survey), an ongoing project to identify compact white dwarf (WD) binaries in the spectroscopic catalog of the...
New Pulsating DB White Dwarf Stars from the Sloan Digital Sky Survey (2008)
Nitta, A., Kleinman, S. J., Krzesinski, J., Kepler, S. O., Metcalfe, T. S., Mukadam, Anjum S., ...
We are searching for new He atmosphere white dwarf pulsators (DBVs) based on the newly found white dwarf stars from the spectra obtained by the Sloan Digital Sky Survey. DBVs pulsate at hotter...
Deciphering the Pulsations of G 29-38 with Optical Time Series Spectroscopy (2008)
Thompson, Susan E., Van Kerkwijk, M. H., Clemens, J. C.
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 shift, and line shape...
Discovery of Photospheric Calcium Line Strength Variations in the DAZd White Dwarf G29-38 (2007)
Von Hippel, Ted, Thompson, Susan E.
Metals in the photospheres of white dwarfs with Teff between 12,000 and 25,000 K should gravitationally settle out of these atmospheres in 1-2 weeks. Temporal variations in the line strengths of...
The Peculiar Pulsations of PY Vul (2004)
Thompson, Susan E., Clemens, J. C., Van Kerkwijk, M. H., O'Brien, M. Sean, Koester, D.
The pulsating white dwarf star PY Vul (G~185-32) exhibits pulsation modes with peculiar properties that set it apart from other variable stars in the ZZ Ceti (DAV) class. These peculiarities include...
High Resolution Spectroscopy of the Pulsating White Dwarf G29-38 (2003)
Thompson, Susan E., Clemens, J. C., Van Kerkwijk, M. H., Koester, D.
We present the analysis of time-resolved, high resolution spectra of the cool white dwarf pulsator, G29-38. From measuring the Doppler shifts of the H-alpha core, we detect velocity changes as large...