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Paper: sdA in SDSS DR12 are Overwhelmingly Not Extremely Low-Mass (ELM) White Dwarfs
Volume: 509, 20th European Workshop on White Dwarfs (EuroWD16)
Page: 453
Authors: Hermes, J. J.; Gänsicke, B. T.; Breedt, E.
Abstract: In a search for new white dwarfs in DR12 of the Sloan Digital Sky Survey, Kepler et al. 2016 found atmospheric parameters for thousands of objects with effective temperatures below 20,000 K and surface gravities between 5.5 < log g < 6.5. They classified these objects as cool subdwarfs – sdA – and speculated that many may be extremely low-mass (ELM) white dwarfs (helium-core white dwarfs with masses below 0.3 M). We present evidence – using radial velocities, photometric colors, and reduced proper motions – that the vast majority (>99%) of these objects are unlikely to be ELM white dwarfs. Their true identity remains an interesting question.
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