THE ELM SURVEY. II. TWELVE BINARY WHITE DWARF MERGER SYSTEMS

@article{Kilic2010THEES,
  title={THE ELM SURVEY. II. TWELVE BINARY WHITE DWARF MERGER SYSTEMS},
  author={Mukremin Kilic and Warren R. Brown and Carlos Allende Prieto and Marcel A. Agueros and Craig O. Heinke and Scott J. Kenyon},
  journal={The Astrophysical Journal},
  year={2010},
  volume={727}
}
We describe new radial velocity and X-ray observations of extremely low-mass white dwarfs (ELM WDs, ∼0.2 M☉) in the Sloan Digital Sky Survey Data Release 4 and the MMT Hypervelocity Star survey. We identify four new short period binaries, including two merger systems. These observations bring the total number of short period binary systems identified in our survey to 20. No main-sequence or neutron star companions are visible in the available optical photometry, radio, and X-ray data. Thus, the… 

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