Cool DZ white dwarfs in the SDSS
D. Koester, J. Girven, B. T. G\"ansicke, P. Dufour

TL;DR
This paper identifies and analyzes 26 cool DZ white dwarfs from SDSS data, extending the known DZ sequence to cooler temperatures and providing detailed atmospheric compositions.
Contribution
The study presents 21 new cool DZ white dwarf discoveries and models their atmospheres, filling a temperature gap and analyzing metal abundances in these stars.
Findings
Extended the DZ sequence to cooler temperatures around 6500 K.
Determined atmospheric parameters and metal abundances for the sample.
Found metal masses comparable to large asteroids in the solar system.
Abstract
We report the identification of 26 cool DZ white dwarfs that lie across and below the main sequence in the Sloan Digital Sky Survey (SDSS) u-g vs. g-r two-color diagram; 21 of these stars are new discoveries. The sample was identified by visual inspection of all spectra of objects that fall below the main sequence in the two-color diagram, as well as by an automated search for characteristic spectral features over a large area in color space that included the main sequence. The spectra and photometry provided by the SDSS project are interpreted with model atmospheres, including all relevant metals. Effective temperatures and element abundances are determined, while the surface gravity has to be assumed and was fixed at the canonical value of log g = 8. These stars represent the extension of the well-known DZ sequence towards cooler temperatures and fill the gap around Teff = 6500 K…
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