2019A&A...628A...1L


Query : 2019A&A...628A...1L

2019A&A...628A...1L - Astronomy and Astrophysics, volume 628A, 1-1 (2019/8-1)

A new weak-field magnetic DA white dwarf in the local 20 pc volume. The frequency of magnetic fields in DA stars.

LANDSTREET J.D. and BAGNULO S.

Abstract (from CDS):

We report the discovery of a new magnetic DA white dwarf (WD), WD 0011-s 721, which is located within the very important 20pc volume-limited sample of the closest WDs to the Sun. This star has a mean field modulus <|B|> of 343kG, and from the polarisation signal we deduce a line-of-sight field component of 75 kG. The magnetic field is sufficiently weak to have escaped detection in classification spectra. We then present a preliminary exploration of the data concerning the frequency of such fields among WDs with hydrogen-rich atmospheres (DA stars). We find that 20±5% of the DA WDs in this volume have magnetic fields, mostly weaker than 1MG. Unlike the slow field decay found among the magnetic Bp stars of the upper main sequence, the WDs in this sample show no evidence of magnetic field or flux changes over several Gyr.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: magnetic field - polarization - white dwarfs - stars: individual: WD 0011-721

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 LAWD 96 WD* 00 02 10.7241976499 -43 09 55.390578662   13.12 13.05     DAP5.8 112 0
2 EGGR 381 WD* 00 12 14.7449947981 +50 25 20.736275736   14.6   14.2   DA7.6 93 0
3 L 50-73 WD* 00 13 49.8915895301 -71 49 54.255953974           DA8.0 22 0
4 G 158-45 WD* 00 14 12.7919361867 -13 11 01.087005764   16.48 15.88     DC8H 56 0
5 LP 991-16 WD* 01 24 03.9865613559 -42 40 38.426729027     14.83 14.52 14.19 DA7H 27 0
6 LP 830-14 WD* 02 35 21.7949399589 -24 00 47.123038900   16.4       DC 30 0
7 EGGR 566 WD* 03 25 11.0474878302 -01 49 15.047041848   16.8 16.22     DZA9 76 0
8 LP 777-1 WD* 05 05 52.4599051681 -17 22 43.482694273   16.71 15.97     DAH9 51 0
9 EGGR 290 WD* 05 56 25.4599888487 +05 21 48.443176471   14.77 14.13 14.00   DA8P 152 0
10 EGGR 436 WD* 13 08 41.1944602216 +85 02 28.161666517   16.76   15.9   DA9P 52 0
11 PG 1350-090 WD* 13 53 15.5345099352 -09 16 33.374583634   14.81 14.60     DAP5.3 44 1
12 EGGR 372 WD* 17 48 07.9928195849 +70 52 35.922050086       13.5   DQ9P 137 0
13 EGGR 374 WD* 18 30 20.2711538874 +54 47 27.207896312   15.99   14.9   DQ7P 90 0
14 LAWD 73 WD* 19 00 10.2533239461 +70 39 51.416733790   13.24   13.5   DAP4.5 244 0
15 LAWD 79 WD* 19 56 29.2263375910 -01 02 32.671070269   13.89 13.56 13.73   DA6.4 137 0
16 EGGR 261 WD* 20 49 06.6996392736 +37 28 14.050387020   13.40   13.2   DA3.4 73 0
17 LAWD 83 WD* 21 13 16.8549349741 -81 49 12.878285501 13.28 13.82 13.59 13.6   DA4.8 103 0
18 L 570-26 WD* 21 41 57.5651598552 -33 00 29.801367360     14.47 14.30 14.16 DZ7 25 0
19 UCAC4 747-070768 WD* 21 51 40.1076922512 +59 17 34.854998748       14.51   DAH 11 1

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2023.09.27-17:23:41

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