G185-32: Velocity and Vexation

Susan E. Thompson1 and J. C. Clemens1
1 Department of Physics and Astronomy,
University of North Carolina, Chapel Hill, USA

 

Understanding the DA white dwarf G185-32 has proven to be difficult given the atypical nature of some of its pulsations. Overall, the amplitdues of its modes are much lower than expected for a DAV with its mean period. Plus, it has a mode whose amplitude is smaller than its harmonic and does not increase in the ultraviolet as expected. Adding to these observations, we introduce time-resolved spectroscopy of the Hydrogen Balmer lines. Preliminary results show significant line-of-sight velocities, making it the first low-amplitude DAV whose pulsation velocities have been measured. We will present this detection along with new insight toward understanding the perplexing nature of G185-32's pulsations.

 
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