1998A&A...338..563H

Query : 1998A&A...338..563H

1998A&A...338..563H - Astronomy and Astrophysics, volume 338563-575 (1998/10-2)

An analysis of DA white dwarfs from the Hamburg Quasar Survey.

HOMEIER D., KOESTER D., HAGEN H.-J., JORDAN S., HEBER U., ENGELS D., REIMERS D. and DREIZLER S.

Abstract (from CDS):

Follow-up spectroscopy of several hundred hot stars detected by the Hamburg Quasar Survey (HQS) has been carried out between 1989 and 1996. We present the analysis of 80 DA white dwarfs using model atmospheres and theoretical cooling tracks to derive the atmospheric parameters Teff and logg, masses and absolute magnitudes. The HQS turned out to be sensitive to the detection of hydrogen-rich white dwarfs in a wide temperature range, from 10000K upwards. Star counts within four HQS fields for magnitudes B≤16.4mag exceed those from the Palomar Green survey by about 50%. The more recent observation campaigns emphasized the detection of very hot degenerates, yielding a large fraction of DA stars with Teff>50000K compared to other surveys. The mean mass of our DA sample is M=0.61M☉, with three massive DA stars exceeding 1M☉ and three DA stars with masses significantly below the assummed lower mass limit for single white dwarf evolution of 0.45M☉. Among the cool DA stars, thirteen are potential ZZ Ceti candidates because their effective temperatures lie close to the instability strip.

Abstract Copyright: ∼

Journal keyword(s): white dwarfs - stars: statistics - surveys

Simbad objects: 87

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Number of rows : 87
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 HS 0008+3302 WD* 00 10 58.8442604304 +33 19 34.415514516   17.0   18.0   DA 8 0
2 LB 411 WD* 00 12 19.3974259224 +16 38 17.940501420   16.9 17.4 17.6   DA 9 0
3 HS 0026+3114 WD* 00 28 41.4883780416 +31 31 09.177837744           DA 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 PB 6177 WD* 00 50 14.2978461768 +07 32 37.660752024           DA 17 0
6 PHL 1019 WD* 01 32 13.1781512880 +05 26 32.997248916   15.8   15.9   DA 17 0
7 PHL 1026 WD* 01 32 57.3645221760 +02 11 33.070054596   16.0   16.2   DA 11 0
8 PHL 1028 WD* 01 33 23.3773261080 +08 16 04.496678904   17.2 17.4     DA 12 0
9 PHL 7591 WD* 01 40 51.5384463960 +05 06 50.586020964   17.4   17.6   DA 4 0
10 HS 0146+0723 WD* 01 49 32.0337607008 +07 38 22.887907620           DA 10 0
11 Feige 17 WD* 01 57 41.1532047120 +07 12 05.560594020   15.1 15.22 15.3   DA2.2 46 0
12 Feige 20 WD* 02 12 04.8543806520 +08 46 50.889500292   13.7 13.84 14.2   DA1.4 49 0
13 GD 24 WD* 02 13 05.3882485536 +16 43 12.484075620   16.0       DA 15 0
14 HS 0235+0514 WD* 02 38 25.1429898840 +05 27 01.781787060   16.9   17.0   DA 9 0
15 HS 0235+0655 WD* 02 38 33.1076288016 +07 08 09.350693736           DA 20 0
16 Feige 31 WD* 03 04 37.3224484032 +02 56 58.037363484   14.68   15.2   DA1.4 68 0
17 HS 0348+2803 WD* 03 52 00.3078509256 +28 12 06.017685336   17.5   17.3   DA 8 0
18 KUV 03520+0500 WD* 03 54 40.1519919504 +05 08 46.290699456   16.0 16.2 16.3   DA1.4 18 0
19 KUV 03561+0807 WD* 03 58 47.9328141408 +08 15 44.556243588   16.5 16.7     DA1.1 12 0
20 HS 0401+0001 WD* 04 04 33.1136981760 +00 09 51.084546048   16.8   16.9   DA 7 0
21 HS 0421+0342 WD* 04 24 16.1211825240 +03 48 52.422489648   16.5   16.9   DA 8 0
22 HS 0424+0141 WD* 04 26 52.3911717168 +01 47 48.932335176   16.0   16.8   DA 12 0
23 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
24 HS 0503+0154 WD* 05 05 39.2077455048 +01 58 29.085875868   15.1 15.3 15.7   DA 16 0
25 HS 0507+0434B WD* 05 10 13.5215260416 +04 38 55.135549140   15.52 15.31 15.63   DA2.3 77 0
26 HS 0507+0434A WD* 05 10 13.9441357968 +04 38 38.436217584   14.14 14.22 14.46   DA4.1 41 0
27 HS 0615+6535 WD* 06 20 30.1179606912 +65 34 21.196971552           DA.6 26 0
28 GD 442 WD* 06 46 31.2773173488 +65 25 39.549824688   16.5       DA 14 0
29 HS 0704+6153 WD* 07 09 32.4965901360 +61 48 19.458822312   17.3   17.1   PG1159 43 0
30 HS 0727+6915 WD* 07 32 51.1263830616 +69 09 33.744544380   16.5   16.9   DA 12 0
31 HS 0742+2306 WD* 07 45 32.8986579864 +22 59 14.332583472           DA 18 0
32 PG 0824+289 ** 08 27 05.0512752687 +28 44 02.778910836   14.391 14.204 14.454   DA+dC 71 0
33 GD 93 WD* 08 44 57.8129895984 +45 36 32.931026928   16.19   15.7   DA 33 0
34 US 950 WD* 09 46 58.8075643272 +47 10 24.556354176   17.6       DA 19 0
35 HS 0943+4852 WD* 09 47 11.1973952976 +48 38 19.424600484   18.5   19.3   DA 7 0
36 HS 0946+4848 ** 09 49 35.5144780272 +48 34 05.224813284   17.4   17.6   DA+M 20 0
37 SBSS 0946+501B WD* 09 50 05.2895939736 +49 55 48.956070900   17.0       DA1.6 23 0
38 SBSS 0949+495 WD* 09 52 47.0714936400 +49 20 53.713273128           DA 21 0
39 HS 0951+3620 WD* 09 54 37.8199447416 +36 06 17.110546344   17.1   18.3   DA 14 0
40 HS 1001+4651 WD* 10 04 33.8335835400 +46 36 24.049436616           DA 12 0
41 HS 1002+4518 WD* 10 06 05.2971468432 +45 04 04.245507588           DA 18 0
42 HS 1003+4852 WD* 10 06 58.0179903840 +48 37 56.213775012           DA 17 0
43 Feige 34 HS* 10 39 36.7358839104 +43 06 09.212615280 9.613 10.91 11.14 11.319 11.464 sdOp 731 0
44 HS 1110+2150 WD* 11 13 05.6436216120 +21 34 20.293303332   16.9   17.6   DA 8 0
45 Ton 82 WD* 12 33 26.6801205648 +46 13 26.820240564   15.2       DA2.1 20 0
46 GD 148 WD* 12 34 56.2208679504 +47 37 33.365659908   14.58   14.9   DA3.3 50 0
47 PG 1234+482 WD* 12 36 45.1436139768 +47 55 22.218366900     14.38     DA.9 98 2
48 HS 1241+4821 WD* 12 43 41.7498493176 +48 05 34.458771696           DA 29 0
49 GD 348 WD* 15 37 44.4366919464 +65 01 48.746398008   14.83   14.6   DA5.1 45 0
50 V* KX Dra WD* 15 41 44.8895982744 +64 53 52.977685920   15.562 15.523 15.658   DA4.2 60 1
51 HS 1556+6025 WD* 15 56 56.0307789408 +60 16 55.580154456           DA 12 0
52 HS 1610+6149 WD* 16 11 37.7755925448 +61 41 32.352972900   16.37 16.36 16.12   DA 13 0
53 PG 1620+648 WD* 16 20 21.5044678032 +64 36 00.098289900   15.36 15.59 16.01   DA1.6 28 0
54 GD 510 WD* 16 26 39.5843702424 +74 30 17.395638840   16   15.7   DA3.6 21 0
55 HS 1641+7132 WD* 16 40 59.9690895048 +71 26 57.520438728   16.5   17.1   DA3.1 14 0
56 HS 1650+7229 WD* 16 49 16.2705374688 +72 24 11.139952032   16.8 16.77 17.4   DA 10 0
57 HS 1653+7753 WD* 16 50 53.9949222024 +77 48 44.874562824   14.70 15.06 15.46   DA 14 0
58 HS 1703+6315A WD* 17 03 27.6160530816 +63 11 23.491493268           DA 12 0
59 HS 1729+7735 WD* 17 26 38.6334519624 +77 33 35.527120128   16.9   16.1   DA 12 0
60 HS 1730+7844 WD* 17 27 18.6509244192 +78 42 06.948103212       16.05   DA 16 0
61 HS 1745+6043 WD* 17 45 53.8873011240 +60 42 11.856664800   15.0 16.3     DA1.4 16 0
62 HS 1749+7145 WD* 17 49 04.2807235272 +71 45 10.209930300           DA.7 13 0
63 HS 1817+7852 WD* 18 14 24.1375448544 +78 54 02.899488348           DA 25 0
64 RX J1820.5+5805 WD* 18 20 29.7868783008 +58 04 40.963525860   13.8 14.23     DA1.0 41 0
65 HS 1822+7452 WD* 18 20 37.2481730520 +74 54 02.868587712   17.10 16.42 16.25   DA 12 0
66 HS 1827+7753 WD* 18 25 09.2620639008 +77 55 35.294437452           DA.7 30 0
67 KUV 18453+6819 WD* 18 45 09.3271391712 +68 22 34.865250132   15.24 15.00 15.65   DA1.4 43 0
68 LB 342 WD* 19 18 23.8680922200 +59 59 54.640997340   14.60 14.91 15.09   DA 35 0
69 HS 1936+6902 WD* 19 38 19.5807052752 +69 09 11.382174000   16.2   16.5   DA 7 0
70 HS 2058+0823 WD* 21 01 13.3731983280 +08 35 09.444941232           DA1.3 17 0
71 PG 2120+055 WD* 21 22 34.8825182184 +05 42 39.612925260   16.23 16.38 16.4   DA1.4 31 0
72 BD+28 4211 HS* 21 51 11.0221915656 +28 51 50.367627468 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 837 0
73 HS 2157+8152 WD* 21 55 48.2039602656 +82 07 21.583289136           DA 13 0
74 HS 2210+1139 WD* 22 13 25.4904345408 +11 45 14.517152064   16.6   15.7   DA 15 0
75 PG 2220+134 WD* 22 23 13.8474496224 +13 38 56.870736036   15.54 15.61 16.09   DA2.1 44 0
76 HS 2234+8352 WD* 22 33 17.3205639552 +84 08 14.528729832           DA 11 0
77 PG 2235+082 WD* 22 37 35.4352202472 +08 28 48.772963524   15.34 15.47 15.84   DA1.4 23 0
78 HS 2236+3118 WD* 22 38 22.7479256880 +31 34 18.361357536     14.75     DA 13 0
79 PG 2239+082 WD* 22 41 43.4370183624 +08 25 11.165682540   16.33 16.21 16.4   DA2.1 16 0
80 HS 2240+1234B WD* 22 42 30.3361463472 +12 50 02.413102452   15.64 16.85 16.65 16.66 DA3.6 24 0
81 HS 2240+1234A WD* 22 42 31.1464949328 +12 50 04.993693332   16.6       DA3.1 31 0
82 PG 2244+031 WD* 22 47 22.2458635560 +03 21 46.927863072   16.1   16.2   DA.8 20 0
83 HS 2246+0640 WD* 22 49 25.2937376928 +06 56 46.593855456   17.1   16.8   DA.4 20 0
84 PG 2308+051 WD* 23 11 17.9166730632 +05 19 28.719529932   15.66   16.2   DA1.4 21 0
85 V* V409 And WD* 23 27 15.9353097240 +40 01 23.429781408   14.1 15.41     DO 89 0
86 PB 5439 WD* 23 33 05.3725527888 +06 13 10.178475708   17.0   16.9   DA 11 0
87 PG 2353+027 WD* 23 56 27.6927573888 +02 57 05.600554632   15.83 15.830 16.1   DA.8 30 0

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