1996A&A...307..149W

Query : 1996A&A...307..149W

1996A&A...307..149W - Astronomy and Astrophysics, volume 307149-161 (1996/3-1)

DA white dwarfs in pointed observations from the ROSAT archive.

WOLFF B., JORDAN S. and KOESTER D.

Abstract (from CDS):

87 pointed PSPC (Position Sensitive Proportional Counter) observations of hot DA white dwarfs, available in the ROSAT public archive until the end of 1994, have been analyzed together with Wide Field Camera (WFC) and EXOSAT data. From the 57 objects with a significant count rate half of the objects have a temperature below 38,000K and a virtually pure hydrogen atmosphere. At higher temperatures most (75%) objects emit a lower X-ray flux than predicted by hydrogen model atmospheres and must therefore contain heavier elements as absorbers. This is probably due to radiative acceleration which prevents these elements from sinking inwards. We also confirmed our previous result that the PSPC detector is a factor of two more sensitive to photons with energies below about 0.2keV.

Abstract Copyright: ∼

Journal keyword(s): X-rays: stars - white dwarfs

Simbad objects: 93

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Number of rows : 93
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 PG 2357+297 WD* 00 00 07.2553163280 +29 57 00.478163124   14.77 12.24 15.63   DA.9 28 0
2 GD 8 WD* 00 39 52.1658354768 +31 32 29.133060396 13.255 14.424 14.699 14.844 15.047 DA1.0 36 0
3 GD 659 WD* 00 53 17.4282107064 -32 59 56.523062760   13.14 13.36     DA1.4 140 0
4 Ton S 205 ** 01 18 37.185 -22 54 57.83   16.4 15.63 15.8 15.59 DA+M 22 0
5 PG 0134+181 WD* 01 37 23.1112389360 +18 22 40.523602080   17.7   17.4   DAO.8 25 0
6 PG 0136+251 WD* 01 38 52.9776840264 +25 23 22.640581464   15.83       DA1.2 91 0
7 GD 419 WD* 01 41 28.8010711152 +83 34 58.829219508   13.0   13.2   DA2.6 53 0
8 GD 421 WD* 01 51 10.2806808408 +67 39 31.251626352 13.133 14.201 14.414 14.509 14.572 DA1.6 62 0
9 V* FS Cet CV* 02 35 07.5939240480 +03 43 56.816311296 11.027 12.209 12.412 12.325 11.968 DA1+dM 379 0
10 LB 1663 WD* 03 22 14.8200931320 -53 45 16.473401928   14.88 14.9 15.51 15.21 DA1.5 78 0
11 GD 50 WD* 03 48 50.1859724280 -00 58 32.290187664 12.596 13.787 14.063 14.210 14.388 DA1.2 272 1
12 EGGR 25 WD* 03 52 11.3301458285 +24 55 48.797718780 15.42 16.32 16.52     DA1.5 93 0
13 LAWD 18 WD* 04 23 55.6973490528 +16 21 15.122076192   14.33 14.27 14.79   DA2.5 125 0
14 LAWD 19 WD* 04 28 39.4103640216 +16 58 12.094977036   13.96 14.03 14.51   DA2.0 135 0
15 HZ 7 WD* 04 33 44.9627622456 +12 42 40.357601928   14.15 14.24 14.49   DA2.3 140 0
16 HZ 14 WD* 04 41 01.7398379640 +10 59 40.001283528   13.68 13.86     DA1.8 133 0
17 SH 2-216 PN 04 43 21.2638228056 +46 42 05.835192876   12.50 12.87 13.04   DAO.6 175 2
18 MCT 0455-2812 WD* 04 57 13.3208333976 -28 07 52.750783812 12.44 13.65 13.92 14.23   DA.8 121 0
19 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1153 0
20 RX J0512.4-4145 WD* 05 12 23.0408828208 -41 45 26.035111800   16.7 16.5 17.1   DA1 28 0
21 RX J0521.3-1029 WD* 05 21 18.9703270488 -10 29 17.546990352   15.6 15.6 15.9   DA1.5 47 0
22 GD 257 WD* 05 50 37.5195849864 +00 05 52.623285612   14.80 15.10 15.1   DA1.1 72 0
23 GD 71 WD* 05 52 27.6198591816 +15 53 13.228887444 11.675 12.783 13.032 13.169 13.337 DA1.5 407 0
24 LAWD 21 WD* 06 15 18.6800032191 +17 43 40.327416245   13.25   13.4   DA1.9 97 0
25 RX J0623.2-3741 WD* 06 23 12.6177525552 -37 41 28.043049264   11.88 12.42 12.6   DA.8 114 0
26 KPD 0631+1043 WD* 06 33 50.2953950856 +10 41 18.057493176 12.60 13.65 13.82 14.00   DA1.8 47 0
27 * alf CMa B WD* 06 45 09.3041925037 -16 43 00.724740067   8.41 8.44     DA1.9 563 1
28 LAWD 23 WD* 06 47 37.9897150309 +37 30 57.066665144   11.97 12.07 12.26   DA2.3 182 0
29 GD 80 WD* 06 54 13.8072319632 -02 09 20.598940836   14.61 14.79 15.05   DA1.5 60 0
30 RX J0715.3-7025 WD* 07 15 16.5785943888 -70 25 05.616247620   13.97 14.178 14.12   DA1 58 0
31 GD 86 WD* 07 34 27.4665127560 +48 41 15.279543528   14.87   14.9   DA3.4 39 0
32 PG 0805+655 ** 08 09 45.435048 +65 18 17.70912   16.22 16.25     DA1.1 13 0
33 PG 0824+289 ** 08 27 05.0512752687 +28 44 02.778910836   14.391 14.204 14.454   DA+dC 71 0
34 TK 1 PN 08 27 05.5323013248 +31 30 08.311631292   15.379 15.725 15.890 16.105 DAO.7 76 0
35 PG 0834+501 WD* 08 37 37.3382291952 +49 52 27.883471980   15.054 15.323 15.761   DAO.8 35 0
36 LB 5893 WD* 08 39 36.4894448736 +19 30 43.660631664 16.70 17.57 17.63   18.00 DA2.5 56 0
37 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
38 PG 1010+065 WD* 10 13 28.1651586672 +06 12 07.314084252   16.30       DA1.1 35 0
39 HE 1013-0505 WD* 10 16 28.6043334312 -05 20 35.222859276     14.1     DAO.9 108 0
40 PG 1026+454 WD* 10 29 45.2951675832 +45 07 04.926948312   16.1 16.13 16.4   DA1.4 58 0
41 SBSS 1029+537 WD* 10 32 09.9865348944 +53 29 35.373072660   14.095 14.453 14.831   DA1.1 90 0
42 EGGR 70 WD* 10 33 42.7629604320 -11 41 38.340637314 11.851 12.847 13.012 13.138 13.278 DA1.9 123 0
43 GD 123 ** 10 36 25.2556059000 +46 08 30.695862156   13.70 13.15     DA+M3 59 1
44 SBSS 1040+493 WD* 10 43 11.4236321376 +49 02 23.528957028           DA1.0 56 0
45 PG 1041+580 WD* 10 44 45.8784815184 +57 44 35.998561716   14.43 14.62 14.82   DA1.6 63 0
46 PG 1058-129 WD* 11 01 12.2408647608 -13 14 42.227355444   15.11 14.93 14.8   DA2.0 37 0
47 PG 1121+145 HS* 11 24 15.1708085928 +14 13 46.248640824   16.37 16.51 16.49   sdO 24 0
48 PG 1123+189 CV* 11 26 19.095480 +18 39 16.56900   13.94 14.10 14.31   A0III 68 0
49 GD 140 WD* 11 37 05.1041466528 +29 47 58.288741080 11.47 12.42 12.45 12.73 12.714 DA2.2 257 0
50 LB 2 WD* 12 16 35.0216372520 +26 29 34.825417440   15.24 15.63     DAO.7 35 0
51 PG 1218+497 ** 12 21 05.3559978624 +49 27 20.459595060   16.12 16.24     DA+dMe 37 0
52 PG 1223+478 WD* 12 25 58.6759037040 +47 32 45.749064588   15.84       DA1.6 20 0
53 GD 148 WD* 12 34 56.2208679504 +47 37 33.365659908   14.58   14.9   DA3.3 50 0
54 PG 1232+238 WD* 12 35 16.3336086552 +23 34 23.877334056   15.66       DA1.1 35 0
55 PG 1234+482 WD* 12 36 45.1436139768 +47 55 22.218366900     14.38     DA.9 98 2
56 L 147-11 WD* 12 51 48.6525880656 -61 18 38.636957808   15.76 15.93 16.05   DA2.0 20 0
57 GD 153 WD* 12 57 02.3224909560 +22 01 52.634778240 11.883 13.060 13.349 13.488 13.669 DA1.2 380 0
58 PG 1305-017 WD* 13 08 15.2126933712 -01 59 04.415410896   16.25 16.0     DAO1.1 37 0
59 HZ 43A WD* 13 16 21.8532409720 +29 05 55.411186877   12.52 12.66     DAwk 477 0
60 PG 1333+498 WD* 13 35 20.9399237760 +49 31 06.494545200   15.626 15.647 15.943   DA1.7 28 0
61 PG 1335+701 WD* 13 36 19.0313336808 +69 49 42.803644836   14.84 15.05 15.42   DA1.6 41 0
62 LAWD 52 WD* 13 38 50.4780906644 +70 17 07.640657534 11.807 12.54 12.60 13.01 12.979 DA2.4 234 0
63 PG 1403-077 WD* 14 06 04.8463136448 -07 58 31.006552260   15.19   15.9   DA1.0 30 0
64 Feige 93 XB* 14 17 40.2189155424 +13 01 48.585467568   15.08 15.29     DA1+dM 57 0
65 PG 1513+442 WD* 15 14 47.1472498584 +44 01 36.763390128   15.22 15.32 15.53   DA1.7 34 0
66 PG 1525+422 HS* 15 27 02.2223932008 +42 04 07.150374156   16.05 16.22     sdBO 22 0
67 PG 1547+016 WD* 15 49 44.9551858584 +01 25 54.777724212   15.73 15.93 16.05   DA.6 23 0
68 PG 1548+406 WD* 15 50 35.2094904864 +40 25 58.634598576   15.61 15.89     DA.9 40 0
69 PG 1603+432 WD* 16 05 21.1618424160 +43 04 35.934912660     15.32     DA1.3 40 0
70 CD-38 10980 WD* 16 23 33.8380498896 -39 13 46.161043572 9.916 10.885 11.029 10.936 10.841 DA2 526 0
71 RX J1629.0+7804 WD* 16 29 10.278576 +78 04 39.91620   12.74 12.95 13.03   DA1.2 86 0
72 PG 1636+351 WD* 16 38 26.3184985560 +35 00 11.890614960 13.585 14.65 14.902 15.013 15.157 DA1.4 89 0
73 PG 1642+386 WD* 16 44 24.2419117104 +38 28 30.530846136   16.03       DA1.1 31 0
74 PG 1657+344 WD* 16 58 51.1124739360 +34 18 53.321336856   16.12       DA.9 70 0
75 PG 1658+441 WD* 16 59 48.4241073768 +44 01 04.038522204   14.3 14.6     DAP1.6 156 0
76 RX J1820.5+5805 WD* 18 20 29.7868783008 +58 04 40.963525860   13.8 14.23     DA1.0 41 0
77 Lan 18 WD* 18 47 39.0288030792 +01 57 35.449794216 11.68 12.73 12.94 13.1 12.3 DA1.7 81 0
78 KPD 1914+0929 WD* 19 16 50.4350464128 +09 34 47.345961900 14.10 15.18 15.21 15.73   DA1.5 20 0
79 GD 222 WD* 19 38 28.2019965216 +32 53 19.688709192   13.46   13.9   DA2.3 55 0
80 MCT 1950-4314 WD* 19 53 47.7634442088 -43 07 13.922601528 13.68 14.77 15.00 14.7   DA1.2 30 0
81 1RXS J200425.2-560301 WD* 20 04 18.2561571528 -56 02 47.934832056       15.716   DA 40 0
82 EC 20048-6034 WD* 20 09 05.6036730480 -60 25 42.533556924 11.94 13.11 13.39 13.69   DA1.2 74 0
83 L 210-114 WD* 20 18 54.6880579032 -57 21 32.761860984 12.56 13.58 13.73 13.9   DA1.8 71 0
84 GD 391 WD* 20 29 56.1796812432 +39 13 32.199117348 12.243 13.218 13.373 13.481 13.623 DA2.0 85 1
85 HD 340611 WD* 20 34 21.8847019255 +25 03 49.750446346 10.687 11.471 11.546 11.648 11.728 DA2.4 329 0
86 GD 394 WD* 21 12 44.0371201584 +50 06 17.887239540 11.70 12.85 13.09     DA1.3 188 1
87 LAWD 88 WD* 21 33 43.3099095824 +83 03 32.431592039   13.00   13.5   DA2.8 67 0
88 RX J2214.1-4918 WD* 22 14 11.9175658032 -49 19 27.216388524   11.28 11.57 11.7   DA.7 123 0
89 GD 246 WD* 23 12 21.6158334024 +10 47 04.257295476 11.578 12.772 13.090 13.238 13.418 DA.9 224 0
90 GD 405 WD* 23 16 43.8787736328 +47 27 15.504431616 15.774 16.585 16.751 17.268 8.731 DA3.5 28 0
91 EC 23216-5458 WD* 23 24 30.8622650808 -54 41 35.509543332   14.91 15.13 15.72   DA1.1 58 0
92 GD 561 WD* 23 45 02.2994571480 +80 56 59.720782524   14.32 14.59 14.87   DAO.7 50 0
93 PG 2349+286 WD* 23 51 56.7446891832 +28 55 12.390241296   15.9 16.26 16.38   DA1.3 23 0

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