Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-07-07
Astronomy and Astrophysics
Astrophysics
4 pages in emulateapj, 1 figure, accepted for publication in the ApJ Letters
Scientific paper
10.1086/591672
We report the discovery of a strong magnetic field in the unique pulsating carbon-atmosphere white dwarf SDSS J142625.71+575218.3. From spectra gathered at the MMT and Keck telescopes, we infer a surface field of B_s ~1.2 MG, based on obvious Zeeman components seen in several carbon lines. We also detect the presence of a Zeeman-splitted He I 4471 line, which is an indicator of the presence of a non-negligible amount of helium in the atmosphere of this Hot DQ star. This is important for understanding its pulsations, as nonadabatic theory reveals that some helium must be present in the envelope mixture for pulsation modes to be excited in the range of effective temperature where the target star is found. Out of nearly 200 pulsating white dwarfs known today, this is the first example of a star with a large detectable magnetic field. We suggest that SDSS J142625.71+575218.3 is the white dwarf equivalent of a roAp star.
Dufour Patrick
Fontaine Gérard
Lai David K.
Liebert James
Williams Karina
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