2007A&A...462.1097J


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.22CEST06:10:08

2007A&A...462.1097J - Astronomy and Astrophysics, volume 462, 1097-1101 (2007/2-2)

The fraction of DA white dwarfs with kilo-Gauss. magnetic fields.

JORDAN S., AZNAR CUADRADO R., NAPIWOTZKI R., SCHMID H.M. and SOLANKI S.K.

Abstract (from CDS):

Weak magnetic fields have been searched for on only a small number of white dwarfs. Current estimates find that about 10% of all white dwarfs have fields in excess of 1MG; according to previous studies this number increases up to about 25% in the kG regime. Our aim is to improve on these statistics by a new sample of ten white dwarfs in order to determine the ratio of magnetic to field-free white dwarfs. Mean longitudinal magnetic fields strengths were determined by means of high-precision circular polarimetry of Hβ and Hγ with the FORS1 spectrograph of the VLT ``Kueyen'' 8m telescope. In one of our objects (LTT7987), we detected a statistically significant (97% confidence level) longitudinal magnetic field varying between (-1±0.5)kG and (+1±0.5)kG. This would be the weakest magnetic field ever found in a white dwarf, but systematic errors cannot completely be ruled out at this level of accuracy. We also observed the sdO star EC11481-2303 but could not detect a magnetic field. VLT observations with uncertainties typically of 1000G or less suggest that 15-20% of WDs have kG fields. Together with previous investigations, the fraction of kG magnetic fields in white dwarfs amounts to about 11-15%, which is close to the current estimations for highly magnetic white dwarfs (>1MG).

Abstract Copyright:

Journal keyword(s): stars: white dwarfs - stars: magnetic fields

CDS comments: Paragraph 4. L 362-434 is a misprint for L 362-81

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 LAWD 10 WD* 01 37 59.3936600367 -04 59 44.670036387   13.20 12.83 12.8   DA+D1 162 0
2 * omi02 Eri B WD* 04 15 21.786 -07 39 29.22 9.147 9.83 9.53     DA2.9 311 0
3 WG 47 WD* 04 43 46.4260691288 -78 51 50.182806484 12.36 13.32 13.47 14.1   DA2.1 36 0
4 Feige 34 HS* 10 39 36.7377085527 +43 06 09.209752646 9.613 10.91 11.14 11.319 11.464 sdOp 583 0
5 EGGR 76 WD* 11 07 59.9504082308 -05 09 26.033453412 12.397 13.093 13.057 13.141 13.215 DA3 139 0
6 CD-22 9142 HS* 11 50 38.8491644822 -23 20 34.598440877   11.57 11.79     sdOB 22 0
7 LP 852-7 WD* 12 05 26.6739742867 -23 33 12.140186272   13.04 12.90 12.66 12.52 DA5.7 39 0
8 BD-07 3632 WD* 13 30 13.6369525883 -08 34 29.470861983 11.803 12.398 12.340 12.39 12.436 DA3.5 168 0
9 CD-38 10980 WD* 16 23 33.8384178546 -39 13 46.160032569 9.916 10.885 11.029 10.936 10.841 DA2 427 1
10 CD-38 10989 * 16 25 17.0249691878 -38 53 21.005742429   12.23 10.17     ~ 1 0
11 Lan 18 WD* 18 47 39.0285643340 +01 57 35.440019889 11.68 12.73 12.94 13.1 12.3 DA1.7 70 0
12 GD 219 WD* 19 21 40.4180173962 +14 40 41.402969332   13.07 13.01 13.3   DA3.3 66 0
13 CD-30 17706 WD* 20 10 56.8485174654 -30 13 06.629141494 11.654 12.286 12.242 12.311 12.381 DA3.1 213 0
14 L 210-114 WD* 20 18 54.6879678120 -57 21 32.761793423 12.56 13.58 13.73 13.9   DA1.8 55 0
15 EGGR 141 WD* 20 42 34.7515357829 -20 04 35.936006222 11.511 12.315 12.396 12.488 12.602 DA2.5 88 0
16 EGGR 150 WD* 21 52 25.3788480672 +02 23 19.576520492 11.942 12.732 12.743 12.839 12.938 DA2.8 162 0
17 RX J2214.1-4918 WD* 22 14 11.9174871148 -49 19 27.217191655   11.28 11.57 11.7   DA.7 106 0

    Equat.    Gal    SGal    Ecl

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2019.08.22-06:10:08

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