The high-field magnetic white dwarf LP790-29: Not a fast rotator *
Universitäts-Sternwarte, Geismarlandstr. 11, 37083 Göttingen, Germany
Corresponding author: K. Beuermann, email@example.com
Accepted: 18 October 2001
We have investigated the nature of the magnetic white dwarf LP 790-29 = 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 mag and % for a mean value of the R-band circular polarization of %. Combined with earlier results by other authors, our observation suggests that LP 790-29 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
© ESO, 2002