A new magnetic white dwarf : PG2329+267

Details A new magnetic white dwarf : PG2329+267 A new magnetic white dwarf : PG2329+267

1998-05-06

arxiv.org/abs/astro-ph/9805060v1

Astronomy and Astrophysics

Astrophysics

5 pages, with 2 encapsulated postscipts figures included

Scientific paper

10.1046/j.1365-8711.1998.01763.x

We have discovered that the white dwarf PG 2329+267 is magnetic, and assuming a centered dipole structure, has a dipole magnetic field strength of approximately 2.3MG. This makes it one of only approximately 4% of isolated white dwarfs with a detectable magnetic field. Linear Zeeman splitting as well as quadratic Zeeman shifts are evident in the hydrogen Balmer sequence and circular spectropolarimetry reveals 10% circular polarisation in the two displaced sigma components of Halpha. We suggest from comparison with spectra of white dwarfs of known mass that PG 2329+267 is more massive than typical isolated white dwarfs, in agreement with the hypothesis that magnetic white dwarfs evolve from magnetic chemically peculiar Ap and Bp type main sequence stars.

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