2009A&A...506.1341K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:38:58

2009A&A...506.1341K - Astronomy and Astrophysics, volume 506, 1341-1350 (2009/11-2)

Analysis of hydrogen-rich magnetic white dwarfs detected in the Sloan Digital Sky Survey.

KUELEBI B., JORDAN S., EUCHNER F., GAENSICKE B.T. and HIRSCH H.

Abstract (from CDS):

A large number of magnetic white dwarfs discovered in the SDSS have so far only been analyzed by visual comparison of the observations with relatively simple models of the radiation transport in a magnetised stellar atmosphere. We model the structure of the surface magnetic fields of the hydrogen-rich white dwarfs in the SDSS. We calculated a grid of state-of-the-art theoretical optical spectra of hydrogen-rich magnetic white dwarfs (WDs) with magnetic field strengths of between 1 MG and 1200 MG for different angles between the magnetic field vector and the line of sight, and for effective temperatures between 7000K and 50000K. We used a least squares minimization scheme with an evolutionary algorithm to find the best-fit magnetic field geometry of the observed data. We used centered dipoles or dipoles that had been shifted along the dipole axis to model the coadded SDSS fiber spectrum of each object. We analyzed the spectra of all known magnetic hydrogen-rich (DA) WDs from the SDSS (97 previously published, plus 44 newly discovered) and also investigated the statistical properties of the magnetic field geometries of this sample.The total number of known magnetic white dwarfs has already been more than tripled by the SDSS and more objects are expected after more systematic searches. The magnetic fields have strengths of between ≃1 and 900MG. Our results further support the claims that Ap/Bp population is insufficient in generating the numbers and field strength distributions of the observed MWDs, and that of either another source of progenitor types or binary evolution is needed. Clear indications of non-centered dipoles exist in about ∼50%, of the objects which is consistent with the magnetic field distribution observed in Ap/Bp stars.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/506/1341): table3.dat>

Simbad objects: 139

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Number of rows : 139

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 SDSS J002128.59+150223.8 WD* 00 21 28.5972580044 +15 02 23.908817488           DC+M 9 0
2 SDSS J004248.19+001955.3 ** 00 42 48.191 +00 19 55.35           DA 8 0
3 PB 6723 WD* 02 11 16.3584362440 +00 31 28.276528779   18       DAH:+M 10 0
4 SDSS J021148.22+211548.2 WD* 02 11 48.1781899408 +21 15 48.424889342           DAP 8 0
5 SDSS J023420.62+264801.6 WD* 02 34 20.6290621803 +26 48 01.739613757           DAH 6 0
6 PB 6994 WD* 03 04 07.4049985147 -00 25 41.969585686   18.2       DAH 19 0
7 SDSS J031824.20+422650.9 WD* 03 18 24.1854649170 +42 26 51.199110684           DAH 6 0
8 SDSS J032628.17+052136.3 WD* 03 26 28.1727891930 +05 21 36.308306949           DAH 6 0
9 KUV 03292+0035 WD* 03 31 45.6925250796 +00 45 16.987155238     16.7     DAH 29 0
10 HE 0330-0002 WD* 03 33 20.3684629702 +00 07 20.654770414   16.8       DBH 20 0
11 SDSS J034308.18-064127.3 WD* 03 43 08.1786817560 -06 41 27.337622572           DAH 8 0
12 SDSS J034511.09+003444.1 WD* 03 45 11.1033991932 +00 34 44.222815371           DAH 12 0
13 SDSS J074853.07+302543.5 WD* 07 48 53.075 +30 25 43.56           DAH 14 0
14 SDSS J074924.91+171355.3 WD* 07 49 24.9229424709 +17 13 55.446164976           DAH 6 0
15 SDSS J075234.95+172525.0 WD* 07 52 34.9747436135 +17 25 25.120993831           DAH 6 0
16 SDSS J075819.57+354443.5 WD* 07 58 19.5793576479 +35 44 43.684096439           DAH 9 0
17 EGGR 428 WD* 07 59 59.5808561774 +43 35 21.103164938   16.39   16.0   DAH 31 0
18 SDSS J080359.93+122943.9 WD* 08 03 59.9351975010 +12 29 44.095141142           DAH 5 0
19 SDSS J080440.35+182731.0 WD* 08 04 40.3565674902 +18 27 30.995847878           DAP 7 0
20 SDSS J080502.28+215320.5 WD* 08 05 02.2870927679 +21 53 20.541231893           DAP 8 0
21 SDSS J080743.33+393829.2 WD* 08 07 43.3352783424 +39 38 29.189582279           DAP 6 0
22 SDSS J080938.10+373053.8 WD* 08 09 38.1088376328 +37 30 53.863843723           DAP 6 0
23 SDSS J081648.70+041223.5 WD* 08 16 48.7091681303 +04 12 23.593083888           DAP 6 0
24 SDSS J081716.39+200834.8 WD* 08 17 16.4014045297 +20 08 35.038249294           DAH 5 0
25 SDSS J082835.82+293448.7 WD* 08 28 35.8278777403 +29 34 48.743231096           DAP 5 0
26 SDSS J083448.63+821059.1 WD* 08 34 48.6828925581 +82 10 58.963972655           DAH 6 0
27 EGGR 59 WD* 08 39 45.5747083834 +20 00 15.822917406   18.01 17.85 18.4   DAH 41 0
28 EGGR 61 WD* 08 40 28.0939553309 +19 43 34.488028020   17.6 17.66 17.7   DA 45 0
29 SDSS J084155.73+022350.5 WD* 08 41 55.7368320135 +02 23 50.712847934           DAH 9 0
30 HS 0848+1213 Ro* 08 51 06.1613336995 +12 01 57.999795603 16.624 17.216 17.041     DA3.4 13 0
31 WD 0853+169 WD* 08 55 23.8836119758 +16 40 59.059897534   19.01 19.03     DAH 10 0
32 SDSS J085550.67+824905.3 WD* 08 55 50.7468670869 +82 49 05.409408840           DAH 5 0
33 US 2035 WD* 08 58 30.8689366565 +41 26 35.747814056   17.0   16.6   DAH 14 0
34 SDSS J090632.65+080715.9 WD* 09 06 32.6468079670 +08 07 16.157204817           DAP 7 0
35 SDSS J090746.83+353821.4 WD* 09 07 46.8431438916 +35 38 21.540117858           DAP 6 0
36 SDSS J091005.44+081512.2 WD* 09 10 05.4498421680 +08 15 12.313015630           DA 8 0
37 SDSS J091124.68+420255.8 WD* 09 11 24.6909562892 +42 02 55.849213208           DAP 8 0
38 SDSS J091437.35+054453.2 WD* 09 14 37.3547458194 +05 44 53.309736636     17.84     DAP 10 2
39 SDSS J091833.32+205536.8 WD* 09 18 33.3211039653 +20 55 36.905429016           DAH 6 0
40 SDSS J092527.47+011328.7 WD* 09 25 27.4641422925 +01 13 28.663791151           DAH 10 0
41 SDSS J093356.39+102215.6 WD* 09 33 56.3891936554 +10 22 15.826994543           DAP 8 0
42 SDSS J093409.90+392759.3 WD* 09 34 09.9105988894 +39 27 59.275983054           DA 7 0
43 SDSS J093447.90+503312.2 WD* 09 34 47.8834236683 +50 33 12.170997463     19.07     DAP 8 1
44 SDSS J094235.01+205208.3 WD* 09 42 35.0267266681 +20 52 08.225250523           DAH 6 0
45 SDSS J094458.92+453901.2 WD* 09 44 58.9271490298 +45 39 01.195666161           DAP 5 0
46 SDSS J100005.67+015859.0 WD* 10 00 05.672 +01 58 59.08   19.97       DA 10 0
47 SDSS J100356.31+053825.6 WD* 10 03 56.3026988583 +05 38 25.653783491           DAP 9 0
48 SDSS J100657.51+303338.0 WD* 10 06 57.5295628350 +30 33 38.181047485           DAH 6 0
49 SDSS J100715.55+123709.5 WD* 10 07 15.5530458770 +12 37 09.497732980           DAP 8 0
50 SDSS J100759.80+162349.6 WD* 10 07 59.8485152033 +16 23 49.781746239   18.14 18.05     DAH 5 1
51 SDSS J101428.09+365724.4 WD* 10 14 28.0849740361 +36 57 24.642519092   19.31 19.24     DAH 7 1
52 SDSS J101529.62+090703.7 WD* 10 15 29.6187102095 +09 07 03.708215746           DAP 8 0
53 SDSS J101618.37+040920.5 WD* 10 16 18.3695138075 +04 09 20.708578110           DA 7 0
54 PG 1015+014 WD* 10 18 05.0426551840 +01 11 23.527722053   16.33 16.3     DAH 61 0
55 SDSS J102220.69+272539.8 WD* 10 22 20.7011207463 +27 25 39.832019042           DAH 4 0
56 SDSS J102239.06+194904.3 WD* 10 22 39.0912418919 +19 49 04.360232759           DAH 4 0
57 LP 372-41 WD* 10 35 32.5952933669 +21 26 04.530380492   17.7   16.2   DAH 9 0
58 SDSS J105404.39+593333.4 WD* 10 54 04.3881238683 +59 33 33.272925373           DA_H: 7 0
59 SDSS J105628.49+652313.5 WD* 10 56 28.4779359038 +65 23 13.451937140           DAH 8 1
60 LSPM J1057+0411 WD* 10 57 09.8288534731 +04 11 30.399591373       17.9   DA 8 0
61 SBSS 1107+603 WD* 11 10 10.5115970289 +60 01 41.398322253   18.0       DAH 14 0
62 SDSS J111812.67+095241.3 WD* 11 18 12.6754717052 +09 52 41.524239939           DAP 8 0
63 SDSS J112030.34-115051.1 WD* 11 20 30.3397244983 -11 50 51.153792062           DAH 6 0
64 SDSS J112257.10+322327.7 WD* 11 22 57.0967183962 +32 23 27.823139941           DAH 4 0
65 SDSS J112328.49+095619.3 WD* 11 23 28.5005584485 +09 56 19.354590472           DA 7 0
66 SDSS J112852.87-010540.7 WD* 11 28 52.8798178925 -01 05 40.826247528           DA 8 0
67 SDSS J112926.23+493931.8 WD* 11 29 26.2265593934 +49 39 31.892098270           DAP 8 1
68 PB 2880 WD* 11 32 15.4228073776 +28 09 34.195519464   17.3       DAH 11 0
69 SBSS 1131+521 WD* 11 33 57.6642498071 +51 52 04.689776045   17.0       DAH 12 0
70 SDSS J113756.50+574022.4 WD* 11 37 56.5093713147 +57 40 22.712349411           DAP 10 0
71 LBQS 1136-0132 WD* 11 38 39.5174485133 -01 49 03.019853995           DAH 23 0
72 SDSS J114006.37+611008.2 WD* 11 40 06.3893837171 +61 10 08.152191357           DAP 6 0
73 SDSS J114829.00+482731.2 WD* 11 48 28.9892773513 +48 27 31.243629681           DAP 7 0
74 UM 466 WD* 11 54 18.1452114927 +01 17 11.547669546   16.6   18.5   DAH 14 0
75 SDSS J115917.39+613914.3 WD* 11 59 17.3926557447 +61 39 14.250549414           DAH 9 0
76 SDSS J120150.10+614257.0 WD* 12 01 50.1359676830 +61 42 56.864006474   18.79 18.80     DAP 11 1
77 SDSS J120609.80+081323.7 WD* 12 06 09.8344402222 +08 13 23.721341748           DAP 7 0
78 SDSS J120728.96+440731.6 WD* 12 07 28.9501704370 +44 07 31.618192197           DAP 7 0
79 SDSS J121209.30+013627.7 No* 12 12 09.3084841458 +01 36 27.771074225           DAH+dL8 41 0
80 SDSS J121635.37-002656.2 WD* 12 16 35.3671699187 -00 26 56.336163201           DAH 12 0
81 2QZ J122209.4+001533 WD* 12 22 09.4396460684 +00 15 34.159004942           DAH 10 0
82 SDSS J122249.13+481133.1 WD* 12 22 49.1348460572 +48 11 33.079297124           DAP 8 0
83 SDSS J122401.48+415551.9 WD* 12 24 01.4659190238 +41 55 52.003918770           DAP 6 0
84 RMB 90 WD* 12 34 14.1071116020 +12 48 29.648581799   17.0       DAH+DA: 17 0
85 SDSS J124806.37+410427.1 WD* 12 48 06.3756339317 +41 04 27.157073789           DAP 8 0
86 A2 42 WD* 12 48 36.3506767505 +29 42 31.847045493   17.5       DAH 7 0
87 2QZ J124851.3-022925 WD* 12 48 51.3110340414 -02 29 24.754693345           DAH 12 0
88 PM J12507+1549 AM* 12 50 44.4474810051 +15 49 57.604260865     18.28     DAH+dM8 13 0
89 SDSS J125416.00+561204.6 WD* 12 54 15.9929246386 +56 12 04.681452820           DAP 6 0
90 [B68b] 104 WD* 12 54 34.6472637349 +37 10 00.139092101   16.32 16.61     DAH 9 0
91 HS 1254+3440 WD* 12 57 15.5374145201 +34 14 39.528157367   17.21 17.08     DAH 28 1
92 SDSS J132002.47+131901.5 WD* 13 20 02.4859152742 +13 19 01.486515564           DAP 6 0
93 SDSS J133340.33+640627.3 WD* 13 33 40.3454421212 +64 06 27.352031539           DAH 12 0
94 SDSS J134043.10+654349.2 WD* 13 40 43.1082060217 +65 43 49.279202438           DAH 12 0
95 SDSS J134820.79+381017.2 WD* 13 48 20.8030336789 +38 10 17.148004743           DAH 6 0
96 SBSS 1349+545 WD* 13 51 41.1714566714 +54 19 47.223981937   15.9 16.4     DAP 26 0
97 SBSS 1405+501 WD* 14 07 16.6598814433 +49 56 13.776125077   19.0       DAH 6 0
98 SDSS J141906.19+254356.5 WD* 14 19 06.2082624972 +25 43 56.590532294           DA 7 0
99 CSO 453 WD* 14 27 03.3684669168 +37 21 10.581964060   17       DAP 8 0
100 PB 3660 WD* 14 30 19.0648981844 +28 11 01.051886127   18       DAH 7 0
101 SDSS J143218.25+430126.7 WD* 14 32 18.2584849042 +43 01 26.747032048           DAP 7 0
102 SDSS J143235.46+454852.5 WD* 14 32 35.4689561325 +45 48 52.574533332           DAP 6 0
103 SDSS J144614.00+590216.7 WD* 14 46 14.0075369147 +59 02 16.621903230           DAH 8 0
104 SDSS J145415.00+432149.5 WD* 14 54 14.9979044664 +43 21 49.495598012           DAP 6 0
105 CBS 229 WD* 15 08 13.2565168963 +39 45 04.760759003           DAP 14 0
106 SDSS J151130.17+422023.0 WD* 15 11 30.1583924187 +42 20 22.919534571           DAP 10 1
107 SDSS J151415.65+074446.4 WD* 15 14 15.6755113105 +07 44 46.745528113           DAH 10 0
108 SDSS J151745.17+610543.6 WD* 15 17 45.1918669641 +61 05 43.647791615           DA_H: 7 0
109 SDSS J152401.59+185659.2 WD* 15 24 01.6138555055 +18 56 58.989331454   18.62 18.57     DAH 7 1
110 SDSS J153532.25+421305.5 WD* 15 35 32.2550377501 +42 13 05.487945228           DA 7 0
111 SDSS J153829.30+530604.6 WD* 15 38 29.2918827694 +53 06 04.648823879           DAH 7 0
112 SDSS J153843.10+084238.2 WD* 15 38 43.1039145365 +08 42 38.505762358   18.34 18.21     DAH 6 1
113 SDSS J154213.47+034800.4 WD* 15 42 13.4759026439 +03 48 00.389579903           DAH 10 0
114 SDSS J154305.67+343223.6 WD* 15 43 05.6757755846 +34 32 23.662103448   17.93 18.55     DAH 11 0
115 SDSS J160437.36+490809.2 WD* 16 04 37.3517705982 +49 08 09.131181792           DAH 10 0
116 SDSS J164357.02+240201.3 WD* 16 43 57.0231419174 +24 02 01.351036973           DAP 6 0
117 SDSS J164703.23+370910.2 WD* 16 47 03.2394875085 +37 09 10.234768492           DAP 8 0
118 SDSS J165029.90+341125.4 WD* 16 50 29.9130926493 +34 11 25.528610707           DAP 8 0
119 SDSS J165203.67+352815.7 WD* 16 52 03.6764343702 +35 28 15.808955559   18.9   18.8   DAH 9 1
120 SDSS J165249.09+333444.9 WD* 16 52 49.0851682253 +33 34 44.982277365           DA 6 0
121 SDSS J170400.01+321328.6 WD* 17 04 00.0046551470 +32 13 28.597967099           DAP 6 0
122 SDSS J171556.29+600643.9 WD* 17 15 56.2786289189 +60 06 43.714907058           DAP 8 0
123 SDSS J172045.37+561214.9 WD* 17 20 45.3602709004 +56 12 14.847305395           DAH 12 0
124 SDSS J172329.15+540755.8 WD* 17 23 29.1445277391 +54 07 55.788787054           DAH 12 0
125 SDSS J172932.48+563204.1 WD* 17 29 32.4923425163 +56 32 04.009693878           DAH 8 0
126 SDSS J202501.10+131025.6 WD* 20 25 01.1035752158 +13 10 25.714489488           DAH 6 0
127 SDSS J204626.15-071037.0 WD* 20 46 26.1491829627 -07 10 36.884470770           DAH 12 0
128 SDSS J205233.51-001610.6 WD* 20 52 33.5140416103 -00 16 10.731136101           DAH 8 0
129 SDSS J214900.86+004842.7 WD* 21 49 00.8661982566 +00 48 42.769318806           DAP 5 0
130 SDSS J214930.74-072812.0 WD* 21 49 30.7424371923 -07 28 11.892974750           DAH 11 0
131 SDSS J215148.31+125525.5 WD* 21 51 48.3006033417 +12 55 24.873409020           DAH 9 0
132 SDSS J220435.05+001242.9 WD* 22 04 35.0460650540 +00 12 42.940885937           DA 5 0
133 PB 5130 WD* 22 18 28.5833873538 -00 00 12.173760588   18       DAH 10 0
134 SDSS J224741.45+145638.7 WD* 22 47 41.4582563778 +14 56 38.844646202   17.6   17.4   DAH 14 1
135 G 28-27 WD* 22 57 26.1170479343 +07 55 42.597100060   17.20   17.0   DAH 27 0
136 SDSS J231951.72+010909.0 WD* 23 19 51.72072 +01 09 09.4212   19.2   18.8 18.37 DAP 10 0
137 SDSS J232248.21+003900.9 WD* 23 22 48.2143644435 +00 39 01.005581589           DAH 11 0
138 SDSS J234605.44+385337.7 WD* 23 46 05.4464159465 +38 53 37.726548074           DAP 8 0
139 PB 7920 WD* 23 46 23.6818797631 -10 23 56.962256231   19       DAP 9 0

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2020.07.04-21:38:58

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