Polarization variability in magnetic white dwarfs GD 229 and G 240-72

Details Polarization variability in magnetic white dwarfs GD 229 and G 240-72 Polarization variability in magnetic white dwarfs GD 229 and G 240-72

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...352..619b&link_type=abstract

Astronomy and Astrophysics, v.352, p.619-622 (1999)

Astronomy and Astrophysics

Astrophysics

8

Stars: Magnetic Fields, Stars: Rotation, Stars: White Dwarfs, Stars: Individual: Gd 229, Stars: Individual: G 240-72

Scientific paper

GD 229 and G 240-72 belong to the group of strongly polarized magnetic (B >= 108) white dwarfs which do not show apparent polarization variability. New polarimetric observations obtained in November 1996 and 1997 at the Nordic Optical Telescope clearly confirmed a previously reported detection of long-term variations in polarization of GD 229 and have given for the first time an evidence of similar variations in G 240-72. As this variability can be seen only on the time scale of >= 10 years, the rotational periods of these objects must be about or longer than 100 years. Such an extremely slow rotation is probably a result of magnetic braking.

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