1999A&A...352..619B


Query : 1999A&A...352..619B

1999A&A...352..619B - Astronomy and Astrophysics, volume 352, 619-622 (1999/12-2)

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

BERDYUGIN A.V. and PIIROLA V.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): stars: magnetic fields - stars: rotation - stars: white dwarfs - stars: individual: GD 229 - stars: individual: G 240-72

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* CL Oct WD* 03 17 15.8468594712 -85 32 25.558244556   13.78 13.66 15.19   DAP 153 1
2 LB 9802 WD* 03 17 19.1282833488 -85 32 31.288377552   13.78 13.66 14.43   DA 125 1
3 EGGR 535 WD* 10 38 55.5700182462 -20 40 56.834110426   15.9 16.28 15.54 15.34 DQ10P 80 0
4 EGGR 372 WD* 17 48 07.9928195849 +70 52 35.922050086       13.5   DQ9P 130 0
5 EGGR 374 WD* 18 30 20.2711538874 +54 47 27.207896312   15.99   14.9   DQ7P 84 0
6 LAWD 73 WD* 19 00 10.2533239461 +70 39 51.416733790   13.24   13.5   DAP4.5 233 0
7 GD 229 WD* 20 12 22.2670866408 +31 13 48.884861856 13.62 14.77 14.85     DXP2 124 0
8 HD 204827 SB* 21 28 57.7592315784 +58 44 23.238427956 8.63 8.74 7.94 7.25 6.76 O9.5IV 325 0
9 KUV 23162+1220 WD* 23 18 45.1023093816 +12 36 02.772571752   15.54 15.38     DAP4 52 0

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2022.05.22-22:58:25

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