2023A&A...670A...2B

Query : 2023A&A...670A...2B

2023A&A...670A...2B - Astronomy and Astrophysics, volume 670A2 (2023/2-1)

Discovery of magnetic fields in five DC white dwarfs.

BERDYUGIN A.V., PIIROLA V., BAGNULO S., LANDSTREET J.D. and BERDYUGINA S.V.

Abstract (from CDS):

About half of white dwarfs (WDs) evolve to the DC state as they cool; the others become DQ or (temporarily?) DZ WDs. The recent magnetic survey of the local 20 pc volume has established a high frequency of magnetic fields among WDs older than 2-3 Gyr, demonstrating that in low- and average-mass WDs, the effects of magnetism become more common as they age, and the fields on average become stronger. However, the available statistics of WDs older than about 5 Gyr do not clearly establish how fields evolve beyond this age. We are carrying out a survey to clarify the occurrence of magnetism in DC-type WDs in order to better understand this late evolution. We use broadband filter polarimetry, arguably the most efficient way to detect magnetic fields in featureless WDs via continuum circular polarization. Here we report the discovery of a magnetic field in five DC WDs (of 23 observed), almost doubling the total sample of known magnetic WDs belonging to the DC spectral class.

Abstract Copyright: © The Authors 2023

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

Simbad objects: 34

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Number of rows : 34
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LP 240-30 WD* 00 07 54.1142958648 +39 47 32.181143127   17.4   16.2   DC 17 0
2 LSR J0013+5437 WD* 00 13 24.4525174836 +54 37 57.643179645   19.0   17.6   DC 15 0
3 PB 6002 WD* 00 30 47.7411416729 +03 46 57.931810615           DC 15 0
4 EGGR 428 WD* 07 59 59.5807976955 +43 35 21.102152499   16.39   16.0   DAH 51 0
5 EGGR 250 WD* 09 15 56.0774298887 +53 25 23.857612513   14.09   14.1   DCP7 157 0
6 LP 315-42 WD* 10 11 41.5774767696 +28 45 59.070596780   18.85   16.1   DQ 53 0
7 HD 107146 PM* 12 19 06.5018840304 +16 32 53.867731128   7.61   6.7   G2V 307 0
8 LP 267-311 WD* 12 54 11.5068014676 +36 20 58.445109887   18.1   16.7   DC 18 0
9 HD 115043 PM* 13 13 37.0081725552 +56 42 29.759356008   7.423 6.813     G1Va 274 0
10 LP 378-956 WD* 13 17 48.9698854800 +21 57 13.593525444   17.0   17.2   DC 26 0
11 HD 117860 PM* 13 33 11.3140750320 -08 26 36.051691992   8.00 7.36     G2V 75 0
12 LP 498-66 WD* 13 49 02.2993528741 +11 55 13.531742924   18.6   17.4   DC9 28 0
13 HD 122652 PM* 14 02 31.6383121656 +31 39 39.089147004   7.69 7.15     F8 98 0
14 HD 122676 SB* 14 02 56.8651424280 +14 58 31.244092716 8.150 7.860 7.140     G7V 62 0
15 HD 124694 PM* 14 13 51.3265850640 +46 19 30.600533604   7.703 7.160     F8V 61 0
16 CSO 649 WD* 14 26 59.4252386592 +49 21 00.455162400   17       DC 18 0
17 LP 857-45 WD* 14 30 15.3811257764 -24 03 26.122843680   19.1       DC 14 0
18 LP 221-217 WD* 14 36 42.8456058552 +43 32 34.611550878   18.1   17.2   DC9 26 0
19 HD 135891 SB* 15 16 21.3732061440 +37 04 10.213565088 7.750 7.700   6.7   F8 43 0
20 LP 176-60 WD* 15 34 51.1670637472 +46 49 48.768557268   19.2   17.8   DC?9 31 0
21 LP 684-16 WD* 16 04 15.0688159424 -07 26 58.019250076   19.4   18.0   DC 12 0
22 LSPM J1614+0906 WD* 16 14 24.6012448290 +09 06 03.906540808   18.4   17.0   DC 13 0
23 LP 626-29 WD* 17 05 02.8737551592 -01 45 02.702492892           DC 11 0
24 LP 24-66 WD* 17 33 34.2910522175 +79 49 16.647556506   18.0   16.0   DC 19 0
25 GD 366 WD* 17 48 26.8613524848 +45 03 27.851777280   15.79   15.6   DC6 24 0
26 LP 139-38 WD* 18 01 27.5196655272 +50 49 58.361329272   18.2   17.1   DC 17 0
27 LP 25-7 WD* 18 51 05.7225967872 +77 38 37.504164372   18.3   16.4   DC 18 0
28 LAWD 73 WD* 19 00 10.2533239461 +70 39 51.416733790   13.24   13.5   DAP4.5 264 0
29 LSR J2059+5517 WD* 20 59 44.8990021490 +55 17 30.022058840   18.7   17.0   DC11 18 0
30 MCT 2109-2934 WD* 21 12 40.6401654648 -29 22 17.960928708 14.48 15.30 15.21 15.41   DC 17 0
31 LP 930-61 WD* 21 55 00.6007203792 -27 50 38.153931360     16.26     DC 17 0
32 LP 287-35 WD* 22 14 08.9405670156 +37 27 13.332370417   16.6   16.5   DC?8 33 0
33 LP 287-39 WD* 22 17 47.6190906902 +37 07 50.922859738   17.7   16.2   DC 25 0
34 G 157-34 WD* 23 14 25.1848641615 -06 32 47.884151896 14.90 15.55 15.42     DC 52 0

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