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


Query : 2001A&A...366..898C

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 - 2022
#notes
1 JL 158 PM* 00 06 40.4558737416 -53 46 55.300711548   16.0       ~ 4 0
2 HE 0059-5701 WD* 01 00 43.7296986458 -56 46 31.368528062   17.5 17.44 16.8   DA 8 0
3 HE 0252-3501 WD* 02 54 37.1081514846 -34 49 54.213039843     15.89 15.8   DA2.9 17 0
4 HE 0358-5127 WD* 03 59 38.1855083784 -51 18 39.833690652 14.70 15.68 15.72 16.07   DA 16 0
5 HE 0409-5154 WD* 04 11 10.3228636440 -51 46 51.045394296 15.03 15.99 16.04 17.2   DA 12 0
6 HE 0412-4744 * 04 13 -47.6           ~ 1 0
7 HE 0418-5326 WD* 04 19 24.7117186968 -53 19 17.093338464 15.29 16.28 16.50 16.1   DA 14 0
8 PG 0953+024 HS* 09 55 34.5945403344 +02 12 48.685093740   14.79 15.00 15.49   sdOHe 14 0
9 PG 0956+021 WD* 09 58 50.5157308008 +01 47 24.166179060   16.05   16.1   DA3.0 32 0
10 PG 0958-119 HS* 10 00 42.5868055272 -12 05 59.230105008   13.84 14.05 14.28   sdO8VIIHe39 15 0
11 HE 1008-1757 HS* 10 10 33.4059194640 -18 11 47.615736012   14.89 15.15 15.59   sdO 8 0
12 HE 1012-0049 WD* 10 15 11.7123856584 -01 04 16.235121432   15.6 15.66     DA2 19 0
13 HE 1017-1618 WD* 10 19 42.7094008056 -16 33 37.933265952   16.1 16.18 16.2   DA1.9 7 0
14 HE 1017-1352 WD* 10 19 52.3625938032 -14 07 34.251584988   14.37 14.58 14.8   DA1.6 41 0
15 V* UZ Sex ** 10 28 34.8776549016 -00 00 29.394837900   13.89   13.9   DA3+dM 76 0
16 HE 1033-2353 HS* 10 36 07.1192315400 -24 08 35.278081980   16.00 16.21     sdB 6 0
17 HE 1038-2326 HS* 10 40 36.8674785744 -23 42 39.592377972   15.80 15.77 16.03   sdB 6 0
18 PG 1047-046 HS* 10 50 26.8995243000 -04 52 35.718249540   14.68       sdB+D 22 0
19 PG 1047-066 HS* 10 50 28.7935274352 -06 53 25.969327980   14.51 14.77 15.11   sdO 8 0
20 HE 1049-1552 WD* 10 52 20.5326933528 -16 08 04.185917016   14.32 14.59 14.0   DA2.5 18 0
21 PG 1053-092 WD* 10 55 45.3491129928 -09 30 58.478543424   16.47   16.4   DA2.1 16 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 12.2408647608 -13 14 42.227355444   15.11 14.93 14.8   DA2.0 25 0
24 HE 1059-2735 HS* 11 01 24.8687002296 -27 51 41.914393668   15.21 15.56     sdO 9 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 41.5864573608 -06 36 52.766853516   16.2   16.0   sdO 12 0
27 HE 1136-2504 HS* 11 39 10.2231003744 -25 20 55.561030836   13.89 14.10 14.67   sdOHe 9 0
28 HE 1142-2311 HS* 11 44 50.1480166440 -23 28 18.466147488   15.40 15.52 15.66   sdOHe 6 0
29 HE 1152-1244 WD* 11 54 34.8166037664 -13 01 16.275935820   15.8   15.4   DA 12 0
30 Feige 54 HS* 12 02 40.0889106504 -19 41 07.945079712   14.15 14.45     sdOHe 6 0
31 HE 1204-3217 WD* 12 06 47.6142331512 -32 34 33.113135028   15.5 15.68 15.2   DA2.2 17 0
32 HE 1221-2618 HS* 12 24 32.6652357000 -26 35 16.632901068   14.83 14.77 14.96   sdB 7 0
33 PG 1225-079 WD* 12 27 47.3585913504 -08 14 37.972720428   14.86 14.74 15.15   DZA4 63 0
34 HE 1225+0038 WD* 12 28 07.7276728272 +00 22 19.623383832   15.2   15.1   DAZ 25 1
35 PG 1229-013 WD* 12 31 34.5018809808 -01 32 08.523532428   14.44 13.79 14.5   DA2.5 37 0
36 PG 1237-141 HS* 12 39 56.5402601160 -14 24 47.723882508   16.13 16.31     sdO 8 0
37 HE 1238-1745 HS* 12 41 01.1118607776 -18 01 57.242438220   14.36 14.58 15.21   sdOHe 11 0
38 HE 1247-1738 ** 12 50 22.0733116080 -17 54 46.559601540   16.32 16.19 15.7   DA3+dM 18 0
39 HE 1256-2738 HS* 12 59 01.3945837008 -27 54 18.765895284   16.9 16.46 16.2   sdOHe 17 0
40 HE 1257-2021 WD* 13 00 27.1442495544 -20 37 29.377288380   16.4   16.4   DO 4 0
41 PG 1258+012 HS* 13 00 59.2051279416 +00 57 11.766735576   16.6   16.7   sdOHe 22 0
42 HE 1258+0123 WD* 13 01 10.5155376720 +01 07 39.926449092   16.5 16.26 16.5   DA4.3 34 0
43 HE 1309-1102 HS* 13 12 02.3719847664 -11 18 15.161493492   16.1       sdB+G9 5 0
44 HE 1310-2733 HS* 13 12 50.5865006472 -27 49 01.842181464   14.24 14.45 14.75   sdOHe 11 0
45 PG 1314+003 WD* 13 17 24.7478552856 +00 02 37.381355736   15.97       DO 28 1
46 HE 1315-1105 WD* 13 17 47.2436645472 -11 21 06.028259904   15.8   15.6   DAZ 20 0
47 HE 1318-2111 HS* 13 21 15.6370363200 -21 27 17.629351236   14.57 14.77     sdO 13 0
48 HE 1325-0854 WD* 13 28 23.9168564352 -09 09 52.979686596   15.2   15.1   DA 13 0
49 HE 1333-0622 ** 13 36 19.6297039176 -06 37 58.578794868   16.2   15.9   DA2+dM 6 0
50 HE 1349-2320 HS* 13 52 14.8434471264 -23 34 57.581319252   15.26 15.51 15.91   sdO 5 0
51 HE 1352-1827 HS* 13 55 26.5613874720 -18 42 09.219280032   16.18 16.12 16.11   sdB+G3 6 0
52 PG 1355-064 HS* 13 57 54.2609548056 -06 37 31.924474572   13.38 13.68 14.10   sdO2VIIIHe40 12 0
53 HE 1356-1613 HS* 13 59 12.5110775616 -16 28 01.792106796   16.1   16.3 16.79 sdO 5 0
54 HE 1419-1205 HS* 14 22 02.1351352392 -12 19 29.392075560   16.2   16.7   sdB 5 0
55 PG 1502-103 HS* 15 05 22.6981844280 -10 31 26.007996468   15.56 15.53 15.66   sdB 8 0
56 PG 1511-048 HS* 15 14 12.9635009088 -04 59 33.314891352   15.16 15.42 15.84   sdB 14 0
57 PG 1511-110 HS* 15 14 16.9962679704 -11 14 12.482699604   14.80 14.97 15.23   sdOHe 9 0
58 PG 1512-035 HS* 15 14 50.0513833920 -03 42 49.896045468   16.16 16.37 16.20   sdOB 9 0

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2022.05.26-19:25:05

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