| Issue |
A&A
Volume 557, September 2013
|
|
|---|---|---|
| Article Number | A38 | |
| Number of page(s) | 4 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361/201220619 | |
| Published online | 23 August 2013 | |
Research Note
Spectropolarimetric observations of cool DQ white dwarfs
1 Department of Physics and Astronomy, University of Turku, Vaisalantie 20, 21500 Piikkio, Finland
e-mail: tommi.vornanen@utu.fi
2 Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, 79104 Freiburg, Germany
3 NASA Astrobiology Institute, Institute for Astronomy, University of Hawaii, HI, USA
4 Finnish Center for Astronomy with ESO, University of Turku, Vaisalantie 20, 21500 Piikkio, Finland
Received: 24 October 2012
Accepted: 16 July 2013
Aims. 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.
Methods. We use high signal-to-noise spectropolarimetric data to search for magnetic fields in a sample of 11 objects.
Results. 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 signal-to-noise ratio and spectral resolution of these data make more observations necessary to reveal the true nature of this object.
Key words: molecular processes / white dwarfs / magnetic fields
© ESO, 2013
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