White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14. (arXiv:1904.01626v1 [astro-ph.SR])

White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14. (arXiv:1904.01626v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Kepler_S/0/1/0/all/0/1">S. O. Kepler</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pelisoli_I/0/1/0/all/0/1">Ingrid Pelisoli</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Koester_D/0/1/0/all/0/1">Detlev Koester</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Reindl_N/0/1/0/all/0/1">Nicole Reindl</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Geier_S/0/1/0/all/0/1">Stephan Geier</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Romero_A/0/1/0/all/0/1">Alejandra D. Romero</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ourique_G/0/1/0/all/0/1">Gustavo Ourique</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Oliveira_C/0/1/0/all/0/1">Cristiane de Paula Oliveira</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Amaral_L/0/1/0/all/0/1">Larissa A. Amaral</a>

White dwarfs carry information on the structure and evolution of the Galaxy,
especially through their luminosity function and initial-to-final mass
relation. Very cool white dwarfs provide insight into the early ages of each
population. Examining the spectra of all stars with $3sigma$ proper motion in
the Sloan Digital Sky Survey Data Release 14, we report the classification for
20 327 spectroscopically confirmed white dwarfs, plus 414 hot subdwarfs, and
340 cataclysmic variables. We obtain Teff, log g and mass for hydrogen
atmosphere white dwarf stars (DAs), warm helium atmosphere white dwarfs (DBs),
hot subdwarfs (sdBs and sdOs), and estimate photometric Teff for white dwarf
stars with continuum spectra (DCs). We find 15855 sdAs and 447 dCs between the
white dwarf cooling sequence and the main sequence, especially below Teff=
10000 K; most are likely low-mass metal-poor main sequence stars, but some
could be the result of interacting binary evolution.

White dwarfs carry information on the structure and evolution of the Galaxy,
especially through their luminosity function and initial-to-final mass
relation. Very cool white dwarfs provide insight into the early ages of each
population. Examining the spectra of all stars with $3sigma$ proper motion in
the Sloan Digital Sky Survey Data Release 14, we report the classification for
20 327 spectroscopically confirmed white dwarfs, plus 414 hot subdwarfs, and
340 cataclysmic variables. We obtain Teff, log g and mass for hydrogen
atmosphere white dwarf stars (DAs), warm helium atmosphere white dwarfs (DBs),
hot subdwarfs (sdBs and sdOs), and estimate photometric Teff for white dwarf
stars with continuum spectra (DCs). We find 15855 sdAs and 447 dCs between the
white dwarf cooling sequence and the main sequence, especially below Teff=
10000 K; most are likely low-mass metal-poor main sequence stars, but some
could be the result of interacting binary evolution.

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