2004AJ....127..477C

Query : 2004AJ....127..477C

2004AJ....127..477C - Astron. J., 127, 477-480 (2004/January-0)

Hard X-ray emission associated with white dwarfs. II.

CHU Y.-H., GUERRERO M.A., GRUENDL R.A. and WEBBINK R.F.

Abstract (from CDS):

We have previously conducted a search for X-ray sources coincident with white dwarfs using the white dwarf catalog compiled by McCook & Sion and the ROSAT sources in the WGA Catalog (Paper I). To include the white dwarfs discovered since 1999 and to include the X-ray sources detected in ROSAT Position Sensitive Proportional Counter (PSPC) observations made with a boron filter, we have carried out another search using an updated list of white dwarfs and the final catalogs of the ROSAT PSPC observations with and without a boron filter. Forty-seven new X-ray sources convincingly coincident with white dwarfs are found and reported in this paper. Among these, only five show hard X-ray emission: three possess confirmed or suggested late-type companions, one is apparently single, and the other is likely a misclassified BL Lac object. The apparently single white dwarf with hard X-ray emission, KPD 0005+5106, was discussed extensively in Paper I. Photospheric origin for the hard X-ray emission from hot DO and DQZO white dwarfs remains a tantalizing possibility, but high-quality near-IR spectroscopic observations and monitoring of the Hα emission line are needed to rule out the existence of a faint dMe companion.

Abstract Copyright: ∼

Journal keyword(s): Stars: Binaries: General - Stars: Coronae - Stars: Late-Type - Stars: White Dwarfs - X-Rays

VizieR on-line data: <Available at CDS (J/AJ/127/477): table1.dat>

Nomenclature: Table 1: 2RXF JHHMMSS.s+DDMMSS N=22.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 67

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Number of rows : 67
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 KPD 0005+5106 WD* 00 08 18.1703149584 +51 23 16.598370912 11.80 13.04 13.32 13.53   DOZ1 126 0
2 NGC 246 PN 00 47 03.3420341616 -11 52 18.971126076 10.15 11.52 11.76 12.18   PG1159 489 0
3 2RXP J005724.6-274323 X 00 57 24.6 -27 43 23           ~ 1 0
4 FOCAP SGP4:46 WD* 00 57 28.4394533952 -27 43 03.847904580   19.98       DA 7 0
5 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
6 GD 1104 WD* 02 05 49.0453427640 -13 38 27.401175096   15.7       DA1.0 23 0
7 EGGR 18 WD* 02 23 36.0793120872 +22 27 29.051674848   15.90 15.83 15.46   DA3.1 49 0
8 FOCAP QSF1:14 WD* 03 41 44.3359480560 -45 13 34.243662900   18.4   20.0   DA 9 0
9 2RXP J034144.5-451341 X 03 41 44.5 -45 13 41           ~ 1 0
10 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
11 V* RR Cae WD* 04 21 05.5631820426 -48 39 07.061113433 14.50 14.92 14.40     DA7.8 168 1
12 MCT 0455-2812 WD* 04 57 13.3208333976 -28 07 52.750783812 12.44 13.65 13.92 14.23   DA.8 121 0
13 HS 0503+0154 WD* 05 05 39.2077455048 +01 58 29.085875868   15.1 15.3 15.7   DA 16 0
14 RX J0512.4-4145 WD* 05 12 23.0408828208 -41 45 26.035111800   16.7 16.5 17.1   DA1 28 0
15 * 14 Aur B XB* 05 15 23.6000866920 +32 41 05.232329700   8.25 7.88     F2V+DA1.3 85 1
16 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
17 KPD 0631+1043 WD* 06 33 50.2953950856 +10 41 18.057493176 12.60 13.65 13.82 14.00   DA1.8 47 0
18 * alf CMa B WD* 06 45 09.3041925037 -16 43 00.724740067   8.41 8.44     DA1.9 563 1
19 Cl* NGC 2516 RK 2 WD* 07 57 50.6471208768 -60 49 54.810631056   16.5 19.55 19.5   DA 30 0
20 2RXP J075756.5-605029 X 07 57 56.5 -60 50 29           ~ 1 0
21 PG 0814+569 WD* 08 18 26.6442945528 +56 45 04.080240828   16.13       DA1.3 18 0
22 EGGR 250 WD* 09 15 56.0774298887 +53 25 23.857612513   14.09   14.1   DCP7 157 0
23 2RXP J091605.3+532626 X 09 16 05.3 +53 26 26           ~ 1 0
24 2RXP J095243.0+492015 X 09 52 43.0 +49 20 15           ~ 1 0
25 SBSS 0949+495 WD* 09 52 47.0714936400 +49 20 53.713273128           DA 21 0
26 HE 1013-0505 WD* 10 16 28.6043334312 -05 20 35.222859276     14.1     DAO.9 108 0
27 PG 1026+454 WD* 10 29 45.2951675832 +45 07 04.926948312   16.1 16.13 16.4   DA1.4 58 0
28 GD 123 ** 10 36 25.2556059000 +46 08 30.695862156   13.70 13.15     DA+M3 59 1
29 PG 1034+001 HS* 10 37 03.8002625256 -00 08 19.118365188 11.589 12.863 13.228 13.383 13.587 sdB/sdO 131 0
30 PG 1038+634 WD* 10 41 57.2390461800 +63 07 01.670817648   15.49 15.3     DA2.0 52 0
31 SBSS 1040+493 WD* 10 43 11.4236321376 +49 02 23.528957028           DA1.0 56 0
32 PG 1041+580 WD* 10 44 45.8784815184 +57 44 35.998561716   14.43 14.62 14.82   DA1.6 63 0
33 2RXP J110548.0+381239 X 11 05 48.0 +38 12 39           ~ 1 0
34 PG 1103+385 WD* 11 05 50.6316120816 +38 13 03.372822264   16.93 17.20     DA1.9 27 0
35 * bet Crt SB* 11 11 39.4787167248 -22 49 33.052973988   4.475 4.449     A1V 162 0
36 PG 1113+413 WD* 11 15 53.6523055656 +41 02 59.128845972   15.21 15.38     DA1.9 33 0
37 PG 1120+439 WD* 11 22 55.0219080264 +43 42 57.837007224   14.2   15.6   DA1.8 42 0
38 PG 1123+189 CV* 11 26 19.095480 +18 39 16.56900   13.94 14.10 14.31   A0III 68 0
39 V* GW Vir WD* 12 01 45.9731868264 -03 45 40.628670300   14.87 15.04     DOQZ1 505 0
40 PG 1223+478 WD* 12 25 58.6759037040 +47 32 45.749064588   15.84       DA1.6 20 0
41 2RXP J122853.4+135950 X 12 28 53.4 +13 59 50           ~ 1 0
42 LP 495-122 WD* 12 28 55.1158821288 +13 59 37.550488164   18.5   18.4   DC 4 0
43 PG 1232+238 WD* 12 35 16.3336086552 +23 34 23.877334056   15.66       DA1.1 35 0
44 GD 150 WD* 12 52 17.1458812728 +15 44 43.466109396   14.36 14.63 14.9   DA1.9 43 0
45 PG 1333+498 WD* 13 35 20.9399237760 +49 31 06.494545200   15.626 15.647 15.943   DA1.7 28 0
46 PG 1335+701 WD* 13 36 19.0313336808 +69 49 42.803644836   14.84 15.05 15.42   DA1.6 41 0
47 2RXP J141038.9-474552 X 14 10 38.9 -47 45 52           ~ 1 0
48 WG 26 WD* 14 10 39.0726246072 -47 44 39.406977780   14.24 14.31     DA2.2 30 0
49 Ton 193 WD* 14 15 43.1060755200 +22 56 45.037931748   16.31   16.2   DA2.1 44 0
50 2RXP J141547.6+225705 X 14 15 47.6 +22 57 05           ~ 1 0
51 Feige 93 XB* 14 17 40.2189155424 +13 01 48.585467568   15.08 15.29     DA1+dM 57 0
52 PG 1513+442 WD* 15 14 47.1472498584 +44 01 36.763390128   15.22 15.32 15.53   DA1.7 34 0
53 PG 1520+525 PN 15 21 46.5635130432 +52 22 03.867341340   15.56 16.6     PG1159 118 1
54 PG 1548+406 WD* 15 50 35.2094904864 +40 25 58.634598576   15.61 15.89     DA.9 40 0
55 2RXP J162824.6+404831 X 16 28 24.6 +40 48 31           ~ 1 0
56 PG 1626+409 WD* 16 28 30.4869526200 +40 48 37.140087348   16.02 16.7     DA2.2 30 0
57 RX J1820.5+5805 WD* 18 20 29.7868783008 +58 04 40.963525860   13.8 14.23     DA1.0 41 0
58 KUV 18453+6819 WD* 18 45 09.3271391712 +68 22 34.865250132   15.24 15.00 15.65   DA1.4 43 0
59 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
60 1RXS J200425.2-560301 WD* 20 04 18.2561571528 -56 02 47.934832056       15.716   DA 40 0
61 EC 20048-6034 WD* 20 09 05.6036730480 -60 25 42.533556924 11.94 13.11 13.39 13.69   DA1.2 74 0
62 BPS CS 29493-0071 WD* 21 54 53.4012426504 -30 29 18.667362696   14.8 15.05 14.9   DA1.7 45 0
63 EC 21529-5452 WD* 21 56 21.2576687736 -54 38 23.017341192 13.11 14.29 14.58     DA1 59 0
64 BPS CS 22881-0031 WD* 22 02 28.5780973944 -41 14 31.560216000 14.29 15.57 15.81 15.97   DA 21 0
65 NGC 7293 PN 22 29 38.5454047152 -20 50 13.747242408 11.894 13.158 13.524 13.689 13.898 DAO.5 983 1
66 LB 1526 WD* 23 34 02.1941290399 -47 14 26.645931358   13.131 13.422 13.762   DA.9 79 0
67 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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