2019A&A...623A..46L


Query : 2019A&A...623A..46L

2019A&A...623A..46L - Astronomy and Astrophysics, volume 623A, 46-46 (2019/3-1)

Discovery of kilogauss magnetic fields on the nearby white dwarfs WD 1105-340 and WD 2150+591.

LANDSTREET J.D. and BAGNULO S.

Abstract (from CDS):

Magnetic fields are present in roughly 10% of white dwarfs. These fields affect the structure and evolution of such stars, and may provide clues about their earlier evolution history. Particularly important for statistical studies is the collection of high-precision spectropolarimetric observations of (1) complete magnitude-limited samples and (2) complete volume-limited samples of white dwarfs. In the course of one of our surveys we have discovered previously unknown kG-level magnetic fields on two nearby white dwarfs, WD 1105-340 and WD 2150+591. Both stars are brighter than mV=15. WD 2150+591 is within the 20pc volume around the Sun, while WD 1105-340 is just beyond 25pc in distance. These discoveries increase the small sample of such weak-field white dwarfs from 21 to 23 stars. Our data appear consistent with roughly dipolar field topology, but it also appears that the surface field structure may be more complex on the older star than on the younger one, a result similar to one found earlier in our study of the weak-field stars WD 2034+372 and WD 2359-434. This encourages further efforts to uncover a clear link between magnetic morphology and stellar evolution.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: magnetic field - white dwarfs - polarization - stars: individual: WD 1105-340 - stars: individual: WD 2150+591

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 LAWD 96 WD* 00 02 10.7241976499 -43 09 55.390578662   13.12 13.05     DAP5.8 112 0
2 LP 649-83 WD* 02 17 19.7317803263 -06 56 28.762501130     17.89     DAZ 14 0
3 SCR J1107-3420A WD* 11 07 47.8968723864 -34 20 51.486668844   13.788 13.633 13.926 13.79 DA3.6 18 0
4 EGGR 261 WD* 20 49 06.6996392736 +37 28 14.050387020   13.40   13.2   DA3.4 73 0
5 UCAC4 747-070768 WD* 21 51 40.1076922512 +59 17 34.854998748       14.51   DAH 11 1

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