The high-field magnetic white dwarf LP790-29: Not a fast rotator

Free access article

Issue		A&A Volume 381, Number 2, January II 2002


Page(s)		487 - 490
Section		Formation, structure and evolution of stars
DOI		http://dx.doi.org/10.1051/0004-6361:20011478

A&A 381, 487-490 (2002)
DOI: 10.1051/0004-6361:20011478

The high-field magnetic white dwarf LP790-29: Not a fast rotator

K. Beuermann and K. Reinsch

Universitäts-Sternwarte, Geismarlandstr. 11, 37083 Göttingen, Germany

(Received 21 September 2001 / Accepted 18 October 2001 )

Abstract
We have investigated the nature of the magnetic white dwarf = LHS 2293 by polarimetric monitoring, searching for short-term variability. No periodicity was found and we can exclude rotation periods between 4 s and 1.5 hour with a high confidence. Maximum amplitudes of sinusoidal variations are $\Delta R < 0.009$ mag and $\Delta V_R < 0.7$ % for a mean value of the R-band circular polarization of $V_R = +9.1\pm0.3$ %. Combined with earlier results by other authors, our observation suggests that is, in fact, an extremely slowly rotating single white dwarf and not an unrecognized fast rotator and/or disguised cataclysmic variable.

Key words: stars: white dwarfs -- stars: rotation -- stars: individual: LP790-29

Offprint request: K. Beuermann, beuermann@uni-sw.gwdg.de

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