1994A&A...290..834J

Query : 1994A&A...290..834J

1994A&A...290..834J - Astronomy and Astrophysics, volume 290834-844 (1994/10-3)

Analysis of ROSAT pointed observations of 15 hot DA white dwarfs.

JORDAN S., WOLFF B., KOESTER D. and NAPIWOTZKI R.

Abstract (from CDS):

We present the results of pointed observations of hot white dwarfs with the ROSAT PSPC detector, and through the P1 filter of the Wide Field Camera. Model atmospheres containing hydrogen and helium, either homogeneously mixed or chemically stratified, are used to analyze the new data together with observations of the same objects by EXOSAT and the ROSAT all-sky survey. We confirm the results of previous studies, that objects between about 20000 and 40000 K have almost pure hydrogen atmospheres while additional absorbers are present in all three objects at higher temperatures. As a by-product we found evidence that the ROSAT PSPC detector is a factor 2.0±0.3 more sensitive to very soft X-ray photons compared to the standard calibration.

Abstract Copyright: ∼

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

Simbad objects: 22

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Number of rows : 22
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 Ton S 163 HS* 00 33 53.8940926200 -27 08 23.860938912   13.96 14.19 14.48   sdO6He1 38 0
2 GD 659 WD* 00 53 17.4282107064 -32 59 56.523062760   13.14 13.36     DA1.4 140 0
3 GD 419 WD* 01 41 28.8010711152 +83 34 58.829219508   13.0   13.2   DA2.6 53 0
4 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
5 LB 1663 WD* 03 22 14.8200931320 -53 45 16.473401928   14.88 14.9 15.51 15.21 DA1.5 78 0
6 SH 2-216 PN 04 43 21.2638228056 +46 42 05.835192876   12.50 12.87 13.04   DAO.6 175 2
7 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
8 GD 257 WD* 05 50 37.5195849864 +00 05 52.623285612   14.80 15.10 15.1   DA1.1 72 0
9 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
10 GD 148 WD* 12 34 56.2208679504 +47 37 33.365659908   14.58   14.9   DA3.3 50 0
11 PG 1234+482 WD* 12 36 45.1436139768 +47 55 22.218366900     14.38     DA.9 98 2
12 HZ 43A WD* 13 16 21.8532409720 +29 05 55.411186877   12.52 12.66     DAwk 477 0
13 PG 1335+701 WD* 13 36 19.0313336808 +69 49 42.803644836   14.84 15.05 15.42   DA1.6 41 0
14 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
15 Feige 91 HS* 14 08 32.2307108736 +59 40 25.466557728   13.199 13.418 13.777   sdB 36 0
16 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
17 GD 222 WD* 19 38 28.2019965216 +32 53 19.688709192   13.46   13.9   DA2.3 55 0
18 MCT 1950-4314 WD* 19 53 47.7634442088 -43 07 13.922601528 13.68 14.77 15.00 14.7   DA1.2 30 0
19 1RXS J200425.2-560301 WD* 20 04 18.2561571528 -56 02 47.934832056       15.716   DA 40 0
20 L 210-114 WD* 20 18 54.6880579032 -57 21 32.761860984 12.56 13.58 13.73 13.9   DA1.8 71 0
21 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
22 GD 561 WD* 23 45 02.2994571480 +80 56 59.720782524   14.32 14.59 14.87   DAO.7 50 0

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