2017MNRAS.464.1294Z


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.14CEST11:23:08

2017MNRAS.464.1294Z - Mon. Not. R. Astron. Soc., 464, 1294-1305 (2017/January-2)

Optical linear polarization of 74 white dwarfs with the RoboPol polarimeter.

ZEJMO M., SLOWIKOWSKA A., KRZESZOWSKI K., REIG P. and BLINOV D.

Abstract (from CDS):

We present the first linear polarimetric survey of white dwarfs (WDs). Our sample consists of WDs of DA and DC spectral types in the SDSS r magnitude range from 13 to 17. We performed polarimetric observations using the RoboPol polarimeter attached to the 1.3-m telescope at Skinakas Observatory. We have 74 WDs in our sample, of which almost all are low-polarized WDs with a polarization degree (PD) lower than 1 per cent; only two have a PD higher than 1 per cent. There is evidence that on average isolated DC-type WDs have a higher PD (with a median PD of 0.78 per cent) than isolated DA-type WDs (with a median PD of 0.36 per cent). On the other hand, the median PD of isolated DA-type WDs is almost the same (i.e. 0.36 per cent) as the median PD of DA-type WDs in binary systems with red dwarfs (dM type; i.e. 0.33 per cent). This shows, as expected, that there is no contribution to the PD from the companion if the WD companion is a red dwarf, which is the most common situation for WD binary systems. We do not find differences in the PD between magnetic and non-magnetic WDs. Because 97 per cent of WDs in our sample have a PD lower than 1 per cent, they can be used as faint zero-polarized standard stars in the magnitude range from 13 to 17 of the SDSS r filter. They cover the Northern sky between 13h and 23h in right ascension and between -11° and 78° in declination. In addition, we found that for low extinction values (<0.04), the best model that describes the dependence of the PD on E(B - V) is given by the equation PD_max, ISM_[per cent] = 0.65 E(B - V)0.12.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): standards - polarization - instrumentation: polarimeters - techniques: polarimetric - white dwarfs - white dwarfs

Simbad objects: 82

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Number of rows : 82

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 1008 0
2 HD 94851 * 10 56 44.2558631737 -20 39 52.614977525   9.47 9.29     A5V 30 0
3 GD 319 SB* 12 50 04.5262298 +55 06 01.800186   12.40 12.26 12.15   sdB+? 73 0
4 Wolf 457 WD* 13 00 09.0636207040 +03 28 41.063269863 16.356 16.452 15.808 15.429 15.044 DAQZ8 92 0
5 GD 322 WD* 13 00 35.1997663267 +59 04 15.593610477 14.81 15.44 15.31 15.93   DA3.3 30 0
6 GD 484 WD* 13 01 21.1269906960 +67 13 07.348604580   16   15.4   DA 12 0
7 PG 1310+583 WD* 13 12 57.9030802260 +58 05 11.287961628   13.89   14.2   DA4.7 35 0
8 EGGR 188 WD* 13 19 13.7222973484 +45 05 09.808706255   14.16   14.3   DA3.6 56 0
9 PG 1319+466 WD* 13 21 15.1029088208 +46 23 23.651395237   14.55   14.7   DA3.5 31 0
10 HS 1334+0701 WD* 13 36 33.6796492987 +06 46 26.743500526   15.1   15.6   DA 11 0
11 PG 1344+573 WD* 13 46 02.0575671224 +57 00 32.792768499   13.4   13.5   DA3.6 47 0
12 EGGR 360 WD* 13 47 24.3695836668 +10 21 38.011535761   15.49   14.8   DA7.1 87 0
13 PG 1349+144 WD* 13 51 53.9034400121 +14 09 45.464525941   15.40 14.77 15.0   DA2.9 27 1
14 PG 1401+006 WD* 14 03 45.3097563509 +00 21 35.921316063   17.03       DA.8 11 0
15 FBS 1402+649 WD* 14 03 53.4747110518 +64 39 53.895924735     17.2     DC 12 0
16 SDSS J140923.26+371048.5 ** 14 09 23.2699474703 +37 10 48.743889948           DA+M0 9 0
17 PG 1407+425 WD* 14 09 45.2394502852 +42 16 00.654922169     14.98     DA5.0 36 0
18 GD 163 WD* 14 10 26.9532829846 +32 08 35.848482257   13.96   14.3   DA2.6 53 0
19 Feige 93 XB* 14 17 40.2191097798 +13 01 48.578693414   15.08 15.29     DA1+dM 51 0
20 PG 1420+518 ** 14 22 41.8910190162 +51 35 37.622345606   15.75       DA+dK 16 0
21 Ton 197 WD* 14 23 40.7247081421 +31 34 59.844316970   15.23 15.34     DA1.8 35 0
22 CSO 645 SB* 14 24 40.5262314790 +49 29 58.052954522   16       DA+dK 16 0
23 CSO 649 WD* 14 26 59.4253382882 +49 21 00.454804754   17       DC 7 0
24 PG 1428+374 WD* 14 30 42.6127365853 +37 10 15.315129457   14.90 15.6     DA3.4 39 0
25 GD 336 WD* 14 31 56.6367406896 +37 06 30.180302968 13.864 15.013 15.283 15.430 15.649 DA1.4 51 0
26 SDSS J143649.61+323734.2 ** 14 36 49.5995887540 +32 37 34.190206183           DA+M1 9 0
27 LBQS 1440-0231 ** 14 43 35.0541803214 -02 43 52.186632335           DA+Me 5 0
28 Ton 214 WD* 14 48 14.0785387103 +28 25 11.639912031     14.71     DA2.1 31 0
29 HS 1447+0454 WD* 14 50 09.8450963953 +04 41 45.628962827   15.2   15.6   DA 10 0
30 PG 1449+168 WD* 14 52 11.3899593348 +16 38 03.665425170   15.6 15.39 15.5   DA2.2 24 0
31 EC 15036-0918 WD* 15 06 19.4335258742 -09 30 20.891473385   15.29 15.15 15.1   DA3.4 13 0
32 GD 176 WD* 15 10 29.0413266718 -10 45 19.417437958   15.65 15.42 15.2   DA4.9 28 0
33 PG 1515+669 WD* 15 15 52.9058891369 +66 42 42.883844617   15.59       DA4.8 17 0
34 HE 1518-0020 WD* 15 21 30.8323364700 -00 30 55.802761743   15.3 15.2 15.5   DA3 17 0
35 LP 135-438 WD* 15 25 42.9438286529 +56 29 08.611735960   17.61   16.3   DC9 16 0
36 Ton 235 WD* 15 27 36.6442551407 +25 35 03.350848320   15.69 15.73 15.14   DA2.2 20 0
37 PG 1527+091 WD* 15 29 50.4041052335 +08 55 46.305966260   13.44 14.72 14.5   DA2.3 25 0
38 GD 347 WD* 15 36 15.8311186163 +50 13 50.983557983   15.97   15.6   DA5.6 40 0
39 Ton 245 HS* 15 40 23.4584728304 +26 48 29.782790077   13.65 13.83     sdB 40 0
40 GD 187 WD* 15 40 33.3577516789 +33 08 52.505353198   16.0   15.0   DA 18 0
41 PG 1548+149 WD* 15 51 15.4169398298 +14 46 59.257685150   14.95   15.2   DA2.4 25 0
42 PG 1553+354 WD* 15 55 01.9914977912 +35 13 28.647650996   14.71 14.79 15.04   DA1.9 30 0
43 PG 1601+581 WD* 16 02 41.9794562575 +57 58 15.317141637   13.98 13.75 13.95   DA3.3 19 0
44 EGGR 116 WD* 16 08 22.1888382580 +42 05 43.437369514   13.91   13.7   DA3.8 39 0
45 GD 196 WD* 16 13 02.2928878600 +16 31 55.185673871   15.86   15.7   DA3.3 36 0
46 PG 1614+160 WD* 16 17 08.7453505426 +15 54 38.497737294   16.08   15.7   DA2.8 24 0
47 G 138-38 WD* 16 32 33.1686144555 +08 51 22.672863948   15.26   14.6   DA8 15 0
48 KUV 16319+3937 WD* 16 33 39.3081444691 +39 30 53.433325500   14.2 13.88     DA2.8 23 0
49 PG 1632+177 WD* 16 34 41.8478397930 +17 36 34.088663717   13.36 13.14 13.34   DA4.9 36 0
50 PG 1636+351 WD* 16 38 26.3185101380 +35 00 11.891030711 13.585 14.65 14.902 15.013 15.157 DA1.4 77 0
51 GD 202 WD* 16 38 40.4040910150 +15 54 16.665916861   15.74 15.60     DA3.8 22 0
52 EGGR 120 WD* 16 39 27.8216532682 +33 25 22.241769713   14.83   14.6   DA4.9 63 0
53 GD 356 WD* 16 40 57.1484593189 +53 41 09.319793049   15.39   15.1   DAEH6.5 107 0
54 GD 357 WD* 16 43 02.2595836629 +38 41 17.210591697   14.69   15.0   DA3.1 41 0
55 PG 1643+144 ** 16 45 39.137880 +14 17 46.04712   15.82 15.36     DA2+dM 25 0
56 PG 1647+376 WD* 16 49 20.2993955424 +37 28 21.248151942   14.90 14.98     DA2.2 39 0
57 GD 515 WD* 16 54 29.0574681303 +63 39 21.175483186   15.5   15.9   DA3.2 33 0
58 EGGR 197 WD* 16 57 09.8598913902 +21 26 48.662290058   14.32   14.1   DA5.4 81 0
59 PG 1658+441 WD* 16 59 48.4241733860 +44 01 04.041324412   14.3 14.6     DAP1.6 133 0
60 PG 1659+303 WD* 17 01 08.0171594912 +30 15 35.584002858   15.11 15.23     DA3.6 15 0
61 HD 154892 PM* 17 07 41.3074528189 +15 12 37.614338046   8.36 7.88     F8V 44 0
62 EGGR 198 WD* 17 08 52.0483898275 +33 12 58.483877773   16.09 15.92     DA3.7 41 0
63 EGGR 370 WD* 17 13 06.0908279458 +69 31 25.507743445   13.4   13.6   DA3.2 52 0
64 G 170-27 WD* 17 14 30.4915843566 +21 27 10.445508256   16.83   16.5   DC7 14 0
65 SDSS J172406.14+562003.1 CV* 17 24 06.1346953976 +56 20 03.083652104   15.65 16.24     DA+dMe 30 0
66 SDSS J173513.29+573011.5 WD* 17 35 13.2877489169 +57 30 11.478051255           DA 14 0
67 TK 2 PN 17 38 02.5443390317 +66 53 47.604306740   14.21 14.53 14.89   DA.6 72 1
68 HS 1827+7753 WD* 18 25 09.2618172959 +77 55 35.295391858           DA.7 21 0
69 KUV 18332+6429 ** 18 33 29.2012688845 +64 31 51.972780237   17.0 16.9     DA+M2 16 0
70 SDSS J184412.58+412029.4 ** 18 44 12.6278552008 +41 20 29.425739575           DA+M6 9 0
71 LP 105-557 WD* 20 06 54.8760845338 +61 43 10.267854932   17.5   16.2   DA 8 0
72 HD 331891 * 20 12 02.1493609779 +32 47 43.690280981   9.53 9.31     A0 52 0
73 GD 229 WD* 20 12 22.2671811253 +31 13 48.884997524 13.62 14.77 14.85     DXP2 121 0
74 HS 2058+0823 WD* 21 01 13.3731369432 +08 35 09.446645594           DA1.3 10 0
75 G 263-3 WD* 21 26 57.6568975270 +73 38 44.664588151 12.15 12.80 12.83 13.30   DA3.1 96 0
76 EGGR 582 WD* 21 38 46.1926338680 +23 09 21.490041640   15.39   14.6   DA4.9 45 0
77 BD+28 4211 HS* 21 51 11.0220905905 +28 51 50.366090892 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 750 0
78 EGGR 150 WD* 21 52 25.3788480672 +02 23 19.576520492 11.942 12.732 12.743 12.839 12.938 DA2.8 170 0
79 LP 343-34 WD* 22 15 06.8963749814 +31 58 39.133666660   17.5 17.00 16.8   DA6.8 12 0
80 HD 212311 * 22 21 58.5829693701 +56 31 52.713825596   8.20 8.12     A0 50 0
81 HS 2236+3118 WD* 22 38 22.7479048004 +31 34 18.362246303     14.75     DA 8 0
82 PG 2306+125 WD* 23 08 34.9890507698 +12 45 40.280161934   15.23 15.23 15.2   DA2.4 30 0

    Equat.    Gal    SGal    Ecl

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2021.06.14-11:23:08

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