SIMBAD references

2019A&A...628A.102K - Astronomy and Astrophysics, volume 628A, 102-102 (2019/8-1)

Carbon-rich (DQ) white dwarfs in the Sloan Digital Sky Survey.


Abstract (from CDS):

Context. Among the spectroscopically identified white dwarfs, a fraction smaller than 2% have spectra dominated by carbon lines, mainly molecular C2, but also a smaller group dominated by CI and CII lines. These are together called DQ white dwarfs.
Aims. We want to derive atmospheric parameters Teff, logg, and carbon abundances for a large sample of these stars and discuss implications for their spectral evolution.
Methods. Sloan Digital Sky Survey spectra and ugriz photometry were used, together with Gaia Data Release 2 parallaxes and G band photometry. These were fitted to synthetic spectra and theoretical photometry derived from model atmospheres. Results. We found that the DQ hotter than Teff∼10000K have masses ∼0.4M larger than the classical DQ, which have masses typical for the majority of white dwarfs (∼0.6M). We found some evidence that the peculiar DQ below 10000K also have significantly larger masses and may thus be the descendants of the hot and warm DQ above 10000K. A significant fraction of the hotter objects with Teff>14500K have atmospheres dominated by carbon.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: atmospheres - white dwarfs - stars: carbon

VizieR on-line data: <Available at CDS (J/A+A/628/A102): tablea1.dat tablea2.dat>

Simbad objects: 304

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