Spectropolarimetric observations of cool DQ white dwarfs
arXiv:1308.4505 · doi:10.1051/0004-6361/201220619
Abstract
Following our recent discovery of a new magnetic DQ white dwarf (WD) with CH molecular features, we report the results for the rest of the DQ WDs from our survey. We use high signal-to-noise spectropolarimetric data to search for magnetic fields in a sample of 11 objects. One object in our sample, WD1235+422, shows the signs of continuum circular polarization that is similar to some peculiar DQs with unidentified molecular absorption bands, but the low S/N and spectral resolution of these data make more observations necessary to reveal the true nature of this object.
4 pages, 4 figures. Accepted for publication in Astronomy & Astrophysics
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- Searching for the weakest detectable magnetic fields in white dwarfs. Highly-sensitive measurements from first VLT and WHT surveys
- The evolution of carbon-polluted white dwarfs at low effective temperatures
- Broad-band spectral energy distribution of 3000 Angstroem break quasars from the Sloan Digital Sky Survey
- Spectrophotometric analysis of magnetic white dwarf II: Helium-rich compositions
- Equation-of-motion coupled-cluster variants in combination with perturbative triples corrections in strong magnetic fields
- Detection of a weak magnetic field in the Balmer emission line white dwarf WDJ1653-1001