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A new look at the pulsating DB white dwarf GD 358:Line-of-sight velocity measurements and constraints on model atmospheres
Rubina Kotak, Marten H. van Kerkwijk, J. C. Clemens +1
We report on our findings of the bright, pulsating, helium atmosphere white dwarf GD 358, based on time-resolved optical spectrophotometry. We identify 5 real pulsation modes and a…
Pulsating or not? A search for hidden pulsations below the red edge of the ZZ instability strip
Rubina Kotak, Marten H. van Kerkwijk, J. Christopher Clemens +1
The location of the red edge of the ZZ Ceti instability strip is defined observationally as being the lowest temperature for which a white dwarf with a H-rich atmosphere (DA) is kn…
Time-resolved optical spectroscopy of the pulsating DA white dwarf HS 0507+0434B: New constraints on mode identification and pulsation properties
Rubina Kotak, Marten H. van Kerkwijk, J. Christopher Clemens
We present a detailed analysis of time-resolved optical spectra of the ZZ Ceti white dwarf, HS 0507+0434B. Using the wavelength dependence of observed mode amplitudes, we deduce th…