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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 witheffective temperatures below 20,000 K and surface gravities between 5.5 <log(g) < 6.5. They classified these objects as cool subdwarfs -- sdA -- andspeculated that many may be extremely low-mass (ELM) white dwarfs (helium-corewhite dwarfs with masses below 0.3 Msun). We present evidence -- using radialvelocities, photometric colors, and reduced proper motions -- that the vastmajority (>99%) of these objects are unlikely to be ELM white dwarfs. Theirtrue identity remains an interesting question.

sdA in SDSS DR12 are Overwhelmingly Not Extremely Low-Mass (ELM) White Dwarfs