Discovery of a Magnetic DZ White Dwarf with Zeeman-Split Lines of Heavy Elements

Details Discovery of a Magnetic DZ White Dwarf with Zeeman-Split Lines of Heavy Elements Discovery of a Magnetic DZ White Dwarf with Zeeman-Split Lines of Heavy Elements

2000-12-12

arxiv.org/abs/astro-ph/0012274v2

Astronomy and Astrophysics

Astrophysics

7 pages, Astrophysical Journal (Letters), in press

Scientific paper

10.1086/319481

A spectroscopic survey of previously-unstudied Luyten Half Second proper motion stars has resulted in the discoveries of two new cool magnetic white dwarfs. One (LHS 2273) is a routine DA star, T= 6,500K, with Zeeman-split H alpha and H beta, for which a simple model suggests a polar field strength of 18.5 MG viewed close to equator-on. However, the white dwarf LHS 2534 proves to be the first magnetic DZ showing Zeeman-split Na I and Mg I components, as well as Ca I and Ca II lines for which Zeeman components are blended. The Na I splittings result in a mean surface field strength estimate of 1.92 MG. Apart from the magnetic field, LHS 2534 is one of the most heavily-blanketed and coolest DZ white dwarfs at T ~ 6,000K.

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