1999ApJ...525..995V

Query : 1999ApJ...525..995V

1999ApJ...525..995V - Astrophys. J., 525, 995-1008 (1999/November-2)

Properties of hot white dwarfs in Extreme-Ultraviolet/Soft X-ray Surveys.

VENNES S.

Abstract (from CDS):

Intermediate-dispersion spectroscopy (Δ∼6 Å) of 38 ultrasoft X-ray sources (ROSAT PSPC/WFC and EUVE)–27 H-rich white dwarfs (DA), one magnetic white dwarf (DAp), eight active galactic nuclei, a new cataclysmic variable, and an active late-type star–is presented. Atmospheric (Teff, log g) and stellar (age, mass) parameters of the DA white dwarfs are determined, for the first time in the case of 12 objects. Adding the present sample to the EUV-selected sample of previous studies by Vennes et al., I define an enlarged population of 141 hot white dwarfs and redetermine the DA white dwarf mass distribution taking into account improved mass measurements for ultramassive white dwarfs. High-dispersion spectroscopy (Δ∼1.0-1.4 Å) of the Hα line core in a representative collection of white dwarfs (the ultramassive DA GD 50, two hot DAs, and the low-mass DA EUVE J0512-006) indicate low projected rotation velocity vrot sin i≤30-65 km.s–1 and no perceptible radial velocity variations in the low-mass white dwarf EUVE J0512-006. Questions on the origin and evolution of hot white dwarf stars are examined in light of these results.

Abstract Copyright: ∼

Journal keyword(s): Stars: Fundamental Parameters - Stars: Magnetic Fields - Stars: White Dwarfs - X-Rays: Galaxies - X-Rays: Stars

Simbad objects: 64

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Number of rows : 64
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 6dFGS gJ000729.2-450222 Sy1 00 07 29.1645059880 -45 02 22.006314852   18.51 17.20 17.34   ~ 7 0
3 2MASS J00390147-1229120 Sy1 00 39 01.4750730960 -12 29 12.205696596   18.14   17.00   ~ 9 0
4 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
5 JL 217 WD* 00 55 56.7911653512 -51 13 54.626949876   17.4   17.1   DA 9 0
6 PG 0102+096 WD* 01 04 41.3013650616 +09 49 42.383758152   13.8 14.1     DA2.0 40 0
7 [VV2006] J013517.0-220336 QSO 01 35 17.0 -22 03 36           ~ 5 0
8 PG 0136+251 WD* 01 38 52.9776840264 +25 23 22.640581464   15.83       DA1.2 91 0
9 GD 1104 WD* 02 05 49.0453427640 -13 38 27.401175096   15.7       DA1.0 23 0
10 V* CL Oct WD* 03 17 15.8468594712 -85 32 25.558244556   13.78 13.66 15.19   DAP 180 1
11 LB 9802 WD* 03 17 19.1282833488 -85 32 31.288377552   13.78 13.66 14.43   DA 141 1
12 MCT 0333-3500 WD* 03 35 33.6931561080 -34 50 01.738125240   15.541 15.686 16.1   DA1.5 16 0
13 MCT 0335-4205 WD* 03 37 15.1696297608 -41 55 23.795637600           DA1.0 16 0
14 [VV2006] J034108.8-363459 QSO 03 41 08.5378237008 -36 35 15.033840684           ~ 6 1
15 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
16 KUV 03520+0500 WD* 03 54 40.1519919504 +05 08 46.290699456   16.0 16.2 16.3   DA1.4 18 0
17 1RXP J041535.7-114028 WD* 04 15 35.6420752176 -11 40 28.579477404   17.6 17.6 17.3   DA.96 5 0
18 MCT 0413-4029 WD* 04 15 39.7969479552 -40 22 32.685067200 14.70 15.90 16.23 16.0   DA1.2 18 0
19 LAWD 19 WD* 04 28 39.4103640216 +16 58 12.094977036   13.96 14.03 14.51   DA2.0 135 0
20 RX J0443.1-0346 WD* 04 43 07.1639093832 -03 46 49.791898632   16.7 16.0 16.8   DA.8 41 0
21 WG 47 WD* 04 43 46.4273702112 -78 51 50.182236864 12.36 13.304 13.418 13.764   DA2.1 53 1
22 1RXS J044550.1-385537 WD* 04 45 50.7656239728 -38 55 38.247370212   16.4 17.5 17.0   DA1.0 9 0
23 HS 0503+0154 WD* 05 05 39.2077455048 +01 58 29.085875868   15.1 15.3 15.7   DA 16 0
24 RX J0512.0-0042 WD* 05 12 06.3899357400 -00 42 05.956344036   13.5 13.8 13.9   DA1.6 46 0
25 1RXS J055701.2-163507 WD* 05 57 01.2992920392 -16 35 12.227842572   17.8   18.1   DA1 14 0
26 RX J0616.8-6457 WD* 06 16 51.8029331520 -64 57 31.963896828   17.6   18.4 18.42 DA 23 0
27 1RXS J061907.3-082825 WD* 06 19 06.9249870384 -08 28 07.150138212   15.57 15.83 16.14   DA.66 9 0
28 HS 0615+6535 WD* 06 20 30.1179606912 +65 34 21.196971552           DA.6 26 0
29 RX J0623.2-3741 WD* 06 23 12.6177525552 -37 41 28.043049264   11.88 12.42 12.6   DA.8 114 0
30 EUVE J0653-56.4 WD* 06 53 55.0291999968 -56 24 47.164755924   16.44   15.41 16.96 DA 17 0
31 SCR J0740-4257 PM* 07 40 11.8071717612 -42 57 40.291971331   15.5 13.835 12.36 10.50 M4.5 41 0
32 1RXS J080024.2-474601 WD* 08 00 24.0177702720 -47 46 01.613482608   17.7       DA 11 0
33 RX J0823.6-2525 WD* 08 23 34.6655665968 -25 25 14.953058544   16.7   15.9   DA1.2 37 1
34 RE J090217-040712 WD* 09 02 17.2992480648 -04 06 55.483329744   13.2 12.4 13.5   DA2.1 52 0
35 HD 80170 * 09 16 57.0762015552 -39 24 05.536849500   6.473 5.304     K2III 75 0
36 1RXS J091657.6-194613 WD* 09 16 57.7063571088 -19 46 25.052161512       16.9   DA.8 31 0
37 RX J0959.6-2605 WD* 09 59 37.2573922032 -26 04 25.939610508   15.3 16.4 15.95   DA.97 9 0
38 V* V381 Vel CV* 10 16 59.0108380392 -41 03 44.236207872   18.25       DC: 19 0
39 RX J1024.7-3021 WD* 10 24 44.1809970768 -30 21 00.427633956   16.7 15.8 16.3   DA1.4 36 0
40 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
41 1RXS J120055.5-363013 WD* 12 00 55.3515130200 -36 30 04.396184100   14.57 14.37 15.31   DA 10 0
42 HZ 43A WD* 13 16 21.8532409720 +29 05 55.411186877   12.52 12.66     DAwk 477 0
43 PG 1353+409 WD* 13 55 56.7078810816 +40 40 55.088069988   15.41 15.55     DA2.1 45 0
44 PG 1403-077 WD* 14 06 04.8463136448 -07 58 31.006552260   15.19   15.9   DA1.0 30 0
45 Feige 93 XB* 14 17 40.2189155424 +13 01 48.585467568   15.08 15.29     DA1+dM 57 0
46 HS 1440+7518 WD* 14 40 05.1341163672 +75 05 33.787957776   15.1 15.3 15.2   DA1 59 0
47 1RXS J153545.2-772439 WD* 15 35 45.3102171624 -77 24 44.132506092   16.6   17.3 17.09 DA1 27 0
48 RX J161419.1-083327 WD* 16 14 19.1263900080 -08 33 26.607175920     13.43     DA1.2 38 0
49 PG 1614+137 WD* 16 16 52.2976937880 +13 34 20.926222860   15.16 15.24 15.4   DA2.2 46 0
50 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
51 PG 1658+441 WD* 16 59 48.4241073768 +44 01 04.038522204   14.3 14.6     DAP1.6 156 0
52 RX J1727.6-3559 WD* 17 27 37.8466377264 -36 00 14.497536312   15.35 15.42 15.83   DA1.5 31 0
53 TK 2 PN 17 38 02.5440465696 +66 53 47.602684320   14.21 14.53 14.89   DA.6 80 1
54 1RXS J174614.9-703902 WD* 17 46 13.8238125504 -70 38 57.824268360   16.6 16.0 16.1   DA1.0 36 0
55 GD 222 WD* 19 38 28.2019965216 +32 53 19.688709192   13.46   13.9   DA2.3 55 0
56 MCT 2031-2745 WD* 20 34 54.5831600616 -27 34 49.200257388 13.61 14.81 15.28 15.53   DA.9 14 0
57 HS 2058+0823 WD* 21 01 13.3731983280 +08 35 09.444941232           DA1.3 17 0
58 1RXS J210958.5-491440 G 21 09 58.5 -49 14 40           ~ 3 0
59 RX J2207.7+2520 WD* 22 07 45.0051959952 +25 20 22.045074144     14.4 14.88   DA1.9 31 0
60 RX J2214.1-4918 WD* 22 14 11.9175658032 -49 19 27.216388524   11.28 11.57 11.7   DA.7 123 0
61 1RXS J221829.6-291135 QSO 22 18 29.6 -29 11 35           ~ 3 0
62 HS 2246+0640 WD* 22 49 25.2937376928 +06 56 46.593855456   17.1   16.8   DA.4 20 0
63 2MASS J23141987-5259012 Sy1 23 14 19.8764439072 -52 59 01.069382220           ~ 9 0
64 1RXS J232503.9-455159 Sy1 23 25 05.6 -45 52 08     19.52     ~ 5 0

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