Discovery of two cool magnetic white dwarfs

Details Discovery of two cool magnetic white dwarfs Discovery of two cool magnetic white dwarfs

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400..315b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 400, no. 1, p. 315-320.

Astronomy and Astrophysics

Astrophysics

23

Cool Stars, Magnetic Stars, Stellar Magnetic Fields, White Dwarf Stars, Infrared Photometry, Signal To Noise Ratios, Visual Photometry

Scientific paper

We report the discovery of magnetism in two cool white dwarfs, LHS 1044 and LHS 1734. Optical and infrared photometry, as well as high signal-to-noise spectroscopy, are presented for both objects. The observed energy distributions along with the measured trigonometric parallaxes are used to derive the effective temperatures and surface gravities. LHS 1734, with T(eff) = 5230 K, becomes the coolest observed magnetic white dwarf. The strength of each magnetic field is estimated from a detailed line profile analysis. Offset dipole models with dipole strengths of 16.7 and 7.3 MG, for LHS 1044 and LHS 1734, respectively, are shown to reproduce successfully the observed line profiles. In both objects, the dipole needs to be offset away from the observer by an amount equal to nearly one-fifth of the stellar radius.

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