GJ 841B - The Second DQ White Dwarf with Polarized CH Molecular Bands

Details GJ 841B - The Second DQ White Dwarf with Polarized CH Molecular Bands GJ 841B - The Second DQ White Dwarf with Polarized CH Molecular Bands

2010-08-23

arxiv.org/abs/1008.3903v1

Astrophysical Journal Letters 720 (2010) L52-L55

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 3 figures

Scientific paper

We report a discovery of the circularly polarized CH $A^2\Delta-X^2\Pi$ and $B^2\Sigma^- -X^2\Pi$ molecular bands in the spectrum of the DQ white dwarf GJ 841B. This is only the second such object since the discovery of G99-37 in the 1970s. GJ 841B is also the first WD to unambiguously show polarization in the C_2 Swan bands. By modeling the intensity and circular polarization in the CH bands we determine the longitudinal magnetic field strength of 1.3 +- 0.5 MG and the temperature of 6100 +- 200 K in the absorbing region. We also present new observations of G99-37 and obtain estimates of the magnetic field strength 7.3 +- 0.3 MG and temperature 6200 +- 200 K, in good agreement with previous results.

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