2001A&A...366..898C


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.18CEST11:10:44

2001A&A...366..898C - Astronomy and Astrophysics, volume 366, 898-912 (2001/2-2)

The stellar content of the Hamburg/ESO survey. I. Automated selection of DA white dwarfs.

CHRISTLIEB N., WISOTZKI L., REIMERS D., HOMEIER D., KOESTER D. and HEBER U.

Abstract (from CDS):

We describe automatic procedures for the selection of DA white dwarfs in the Hamburg/ESO objective-prism survey (HES). For this purpose, and the selection of other stellar objects (e.g., metal-poor stars and carbon stars), a flexible, robust algorithm for detection of stellar absorption and emission lines in the digital spectra of the HES was developed. Broad band (U-B, B-V) and intermediate band (Stroemgren c1) colours can be derived directly from HES spectra, with precisions of σU–B=0.092mag; σB–V=0.095mag; σc1=0.15mag. We describe simulation techniques that allow one to convert model or slit spectra to HES spectra. These simulated objective-prism spectra are used to determine quantitative selection criteria, and for the study of selection functions. We present an atlas of simulated HES spectra of DA and DB white dwarfs. Our current selection algorithm is tuned to yield maximum efficiency of the candidate sample (minimum contamination with non-DAs). DA candidates are selected in the B-V versus U-B and c1 versus Wλ(Hβ +Hγ+Hδ) parameter spaces. The contamination of the resulting sample with hot subdwarfs is expected to be as low as ∼8%, while there is essentially no contamination with main sequence or horizontal branch stars. We estimate that with the present set of criteria, ∼80% of DAs present in the HES database are recovered. A yet higher degree of internal completeness could be reached at the expense of higher contamination. However, the external completeness is limited by additional losses caused by proper motion effects and the epoch differences between direct and spectral plates used in the HES.

Abstract Copyright:

Journal keyword(s): surveys - methods: data analysis - white dwarfs

Simbad objects: 58

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Number of rows : 58

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 JL 158 PM* 00 06 40.4555997150 -53 46 55.301534350   16.0       ~ 3 0
2 HE 0059-5701 WD* 01 00 43.7297739531 -56 46 31.369359715   17.5 17.44 16.8   DA 7 0
3 HE 0252-3501 WD* 02 54 37.1071203979 -34 49 54.214450702     15.89 15.8   DA2.9 13 0
4 HE 0358-5127 WD* 03 59 38.1854966605 -51 18 39.834330285 14.70 15.68 15.72 16.07   DA 14 0
5 HE 0409-5154 WD* 04 11 10.3229588127 -51 46 51.045002527 15.03 15.99 16.04 17.2   DA 10 0
6 HE 0412-4744 * 04 13 -47.6           ~ 1 0
7 HE 0418-5326 WD* 04 19 24.7120200348 -53 19 17.097610106 15.29 16.28 16.50 16.1   DA 12 0
8 PG 0953+024 HS* 09 55 34.5944013000 +02 12 48.685671756   14.79 15.00 15.49   sdOHe 13 0
9 PG 0956+021 WD* 09 58 50.5159748587 +01 47 24.166427820   16.05   16.1   DA3.0 29 0
10 PG 0958-119 HS* 10 00 42.5869028362 -12 05 59.231088457   13.84 14.05 14.28   sdOHe 13 0
11 HE 1008-1757 HS* 10 10 33.4058206779 -18 11 47.616227317   14.89 15.15 15.59   sdO 6 0
12 HE 1012-0049 WD* 10 15 11.7124003732 -01 04 16.237224922   15.6 15.66     DA2 16 0
13 HE 1017-1618 WD* 10 19 42.7099163658 -16 33 37.930685190   16.1 16.18 16.2   DA1.9 6 0
14 HE 1017-1352 WD* 10 19 52.3622790921 -14 07 34.262693016   14.37 14.58 14.8   DA1.6 39 0
15 V* UZ Sex WD* 10 28 34.8776752831 -00 00 29.394108221   13.89   13.9   DA3+dM 75 0
16 HE 1033-2353 HS* 10 36 07.1193518726 -24 08 35.281511490   16.00 16.21     sdB 5 0
17 HE 1038-2326 HS* 10 40 36.8566339583 -23 42 39.539659425   15.80 15.77 16.03   sdB 6 0
18 PG 1047-046 HS* 10 50 26.8999812762 -04 52 35.718535422   14.68       sdB+D 21 0
19 PG 1047-066 HS* 10 50 28.7933072279 -06 53 25.968650715   14.51 14.77 15.11   sdO 7 0
20 HE 1049-1552 WD* 10 52 20.5328561073 -16 08 04.183029266   14.32 14.59 14.0   DA2.5 16 0
21 PG 1053-092 WD* 10 55 45.3491138065 -09 30 58.477451069   16.47   16.4   DA2.1 13 0
22 HE 1058-1334 * 10 59 57.48 -13 47 39.7   17.5   18.1   ~ 1 0
23 PG 1058-129 WD* 11 01 12.2407212447 -13 14 42.227595902   15.11 14.93 14.8   DA2.0 23 0
24 HE 1059-2735 HS* 11 01 24.8685849184 -27 51 41.914369709   15.21 15.56     sdO 8 0
25 GD 135 WD* 11 19 34.60008 -02 39 03.1932   14.56 14.48 14.68   DA 17 0
26 PG 1130-063 HS* 11 32 41.5865487797 -06 36 52.766442878   16.2   16.0   sdO 10 0
27 HE 1136-2504 HS* 11 39 10.2231069120 -25 20 55.562985112   13.89 14.10 14.67   sdOHe 7 0
28 HE 1142-2311 HS* 11 44 50.1476455560 -23 28 18.464669924   15.40 15.52 15.66   sdOHe 5 0
29 HE 1152-1244 WD* 11 54 34.8167315145 -13 01 16.274579654   15.8   15.4   DA 10 0
30 Feige 54 HS* 12 02 40.0887065351 -19 41 07.944621226   14.15 14.45     sdOHe 5 0
31 HE 1204-3217 WD* 12 06 47.6143162101 -32 34 33.112355104   15.5 15.68 15.2   DA2.2 15 0
32 HE 1221-2618 HS* 12 24 32.6651495222 -26 35 16.631069910   14.83 14.77 14.96   sdB 5 0
33 PG 1225-079 WD* 12 27 47.3585973005 -08 14 37.972964044   14.86 14.74 15.15   DZA4 57 0
34 HE 1225+0038 WD* 12 28 07.7274384270 +00 22 19.624696701   15.2   15.1   DAZ 21 1
35 PG 1229-013 WD* 12 31 34.5018439039 -01 32 08.522496654   14.44 13.79 14.5   DA2.5 33 0
36 PG 1237-141 HS* 12 39 56.5407708748 -14 24 47.727838930   16.13 16.31     sdO 7 0
37 HE 1238-1745 HS* 12 41 01.1117028566 -18 01 57.242824893   14.36 14.58 15.21   sdOHe 9 0
38 HE 1247-1738 WD* 12 50 22.0731640839 -17 54 46.561124536   16.32 16.19 15.7   DA3+dM 18 0
39 HE 1256-2738 HS* 12 59 01.3945642122 -27 54 18.770482218   16.9 16.46 16.2   sdOHe 13 0
40 HE 1257-2021 WD* 13 00 27.1448436784 -20 37 29.383578375   16.4   16.4   DO 4 0
41 PG 1258+012 HS* 13 00 59.2055058036 +00 57 11.770689604   16.6   16.7   sdOHe 20 0
42 HE 1258+0123 WD* 13 01 10.5152611639 +01 07 39.931497593   16.5 16.26 16.5   DA4.3 32 0
43 HE 1309-1102 HS* 13 12 02.3726057062 -11 18 15.158531201   16.1       sdB+G9 4 0
44 HE 1310-2733 HS* 13 12 50.5863267783 -27 49 01.842815976   14.24 14.45 14.75   sdOHe 9 0
45 PG 1314+003 WD* 13 17 24.7479077595 +00 02 37.376582009   15.97       DO 26 1
46 HE 1315-1105 WD* 13 17 47.2437026737 -11 21 06.029306163   15.8   15.6   DAZ 19 0
47 HE 1318-2111 HS* 13 21 15.6370872757 -21 27 17.630329433   14.57 14.77     sdO 10 0
48 HE 1325-0854 WD* 13 28 23.9169332981 -09 09 52.979046930   15.2   15.1   DA 11 0
49 HE 1333-0622 WD* 13 36 19.6297009089 -06 37 58.584955290   16.2   15.9   DA2+dM 5 0
50 HE 1349-2320 HS* 13 52 14.8436545703 -23 34 57.582123691   15.26 15.51 15.91   sdO 4 0
51 HE 1352-1827 HS* 13 55 26.5619161319 -18 42 09.216547859   16.18 16.12 16.11   sdB+G3 5 0
52 PG 1355-064 HS* 13 57 54.2609296473 -06 37 31.923502914   13.38 13.68 14.10   sdO2VIIIHe40 10 0
53 HE 1356-1613 HS* 13 59 12.5114211880 -16 28 01.804527556   16.1   16.3 16.79 sdO 3 0
54 HE 1419-1205 HS* 14 22 02.1349967042 -12 19 29.396184439   16.2   16.7   sdB 4 0
55 PG 1502-103 HS* 15 05 22.6986648981 -10 31 26.014358668   15.56 15.53 15.66   sdB 7 0
56 PG 1511-048 HS* 15 14 12.9637843914 -04 59 33.316062740   15.16 15.42 15.84   sdB 13 0
57 PG 1511-110 HS* 15 14 16.9965600829 -11 14 12.484653526   14.80 14.97 15.23   sdOHe 8 0
58 PG 1512-035 HS* 15 14 50.0514999977 -03 42 49.898227469   16.16 16.37 16.20   sdOB 7 0

    Equat.    Gal    SGal    Ecl

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2020.09.18-11:10:44

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