Discovery of a Highly Magnetic White Dwarf with Strong Carbon Features

Details Discovery of a Highly Magnetic White Dwarf with Strong Carbon Features Discovery of a Highly Magnetic White Dwarf with Strong Carbon Features

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...512..916s&link_type=abstract

The Astrophysical Journal, Volume 512, Issue 2, pp. 916-919.

Astronomy and Astrophysics

Astronomy

27

Polarization, Stars: Individual (Lhs 2229), Stars: Magnetic Fields, Stars: White Dwarfs

Scientific paper

Systematic follow-up of high proper-motion stars has identified a new cool magnetic white dwarf that displays a series of spectacular absorption bands in the range 4200-6500 Å. The spectrum bears a striking resemblance to that of LP 790-29, a magnetic DQ star dominated by what are apparently Zeeman-shifted Swan bands of C_2. However, key differences in the detailed spectra, polarization, and temperature of the two stars indicate that instead LHS 2229 may represent the first case of a magnetic ``peculiar'' DQ white dwarf, where absorption in the optical is produced by C_2H or another carbon-hydrogen compound. Crude arguments suggest that the field strength on LHS 2229 is in the neighborhood of 10^8 G. BVI photometry proves to be effective in identifying such peculiar stars, since they lie well outside the main white dwarf sequence in a color-color diagram.

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