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Title:
Discovery of two cool magnetic white dwarfs
Authors:
Bergeron, P.; Ruiz, Maria-Teresa; Leggett, S. K.
Affiliation:
AA(Montreal Univ., Canada), AB(Univ. de Chile, Santiago), AC(U.S. Naval Observatory, Flagstaff, AZ; Universities Space Research Association, Columbia, MD)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 400, no. 1, p. 315-320. (ApJ Homepage)
Publication Date:
11/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Cool Stars, Magnetic Stars, Stellar Magnetic Fields, White Dwarf Stars, Infrared Photometry, Signal To Noise Ratios, Visual Photometry
DOI:
10.1086/171997
Bibliographic Code:
1992ApJ...400..315B

Abstract

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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