2005A&A...430..223L

Query : 2005A&A...430..223L

2005A&A...430..223L - Astronomy and Astrophysics, volume 430, 223-243 (2005/1-4)

Hot subdwarfs from the ESO Supernova Ia Progenitor Survey. I. Atmospheric parameters and cool companions of sdB stars.

LISKER T., HEBER U., NAPIWOTZKI R., CHRISTLIEB N., HAN Z., HOMEIER D. and REIMERS D.

Abstract (from CDS):

We present the analysis of a high-resolution, high-quality sample of optical spectra for 76 subdwarf B (sdB) stars from the ESO Supernova Ia Progenitor Survey (SPY, Napiwotzki et al., 2001AN....322..411N). Effective temperature, surface gravity, and photospheric helium abundance are determined simultaneously by fitting the profiles of hydrogen and helium lines using synthetic spectra calculated from LTE and NLTE model atmospheres. We perform a detailed comparison of our measurements with theoretical calculations, both for single star evolution and for binary population synthesis models of close binary evolution. The luminosity evolution given by the standard EHB evolutionary tracks from Dorman et al. (1993ApJ...419..596D) shows an overall agreement in shape with our observations, although a constant offset in luminosity exists. The various simulation sets for binary formation channels of sdB stars calculated by Han et al. (2003MNRAS.341..669H) are compared individually to our data for testing our current understanding of sdB formation processes and the physical effects involved. The best-matching sets manage to reproduce the observed sdB distribution in the temperature-gravity-plane well. However, they do not match the observed cumulative luminosity function, indicating that theoretical improvement is necessary. We also investigate composite-spectrum objects showing clear signatures of a cool companion with optical and infrared photometry. These stars have cool main sequence companions of spectral types F to K. Typical helium abundances of composite and non-composite sdB stars do not differ.

Abstract Copyright: ∼

Journal keyword(s): binaries: spectroscopic - stars: abundances - stars: atmospheres - stars: fundamental parameters - stars: horizontal-branch - subdwarfs

VizieR on-line data: <Available at CDS (J/A+A/430/223): table1.dat>

Simbad objects: 78

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Number of rows : 78
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 HS 2357+2201 HS* 00 00 18.4044368064 +22 18 02.959056900   13.3       sdB 11 0
2 PG 2359+197 HS* 00 02 08.4740452488 +19 59 13.142278968   14.40       sdB 18 0
3 PHL 699 HS* 00 09 45.9076865640 -21 56 13.704627480   14.84 15.10     sdBHe0 11 0
4 HS 0016+0044 HS* 00 18 43.5160419600 +01 01 23.632082616   14.75 14.88 15.13   sdB1.5VIIHe2 21 0
5 JL 179 HS* 00 21 27.7220609592 -55 29 12.157363032   15.924 16.107 15.668   sdB 11 0
6 Ton S 155 HS* 00 23 59.3423963568 -23 09 53.796509928   16.00 15.94 16.04   sdB 17 0
7 Ton S 161 HS* 00 31 12.9491656392 -27 12 54.182178396   15.21 15.13 15.44   sdBHe0+F/G 24 0
8 Ton S 163 HS* 00 33 53.8940926200 -27 08 23.860938912   13.96 14.19 14.48   sdO6He1 37 0
9 GD 656 HS* 00 51 03.9222688464 -19 59 59.319419640   14.56 14.83 15.01   sdBHe0 32 0
10 PG 0057+155 HS* 00 59 56.6673699744 +15 44 13.740284580   12.02 12.32     sdB0.2VIIIpHe8 126 1
11 Ton S 185 HS* 01 03 43.7255136960 -26 51 53.553580668   15.059 15.280 15.299   sdBHe1 20 0
12 GD 687 HS* 01 10 18.6196714608 -34 00 25.710906636   13.89 14.08 14.39   sdBHe1 39 0
13 Ton S 201 HS* 01 12 11.6603448960 -26 13 27.659728416   13.09 13.71     sdBHe0 63 0
14 GD 1453 HS* 01 25 22.2863248176 -33 15 09.674055864   15.43 15.64 15.58   sdBHe1 14 0
15 HE 0135-6150 HS* 01 37 30.0320051160 -61 34 58.383423696   16.6   16.1   sdB 6 0
16 Ton S 225 HS* 01 39 14.4741216912 -27 43 21.871673832   16.6 16.17 16.0   sdBHe0 15 0
17 SB 774 HS* 01 53 11.1854953800 -39 04 18.240675816   14.13 14.29 14.51   sdB 15 0
18 PB 8949 HS* 01 56 42.4338931728 -06 55 40.150812828   15.90 16.04 15.72   sdB 14 0
19 PG 0207+005 HS* 02 10 14.9808193560 +00 45 02.229360804   15.27 15.43 15.91   sdB 16 0
20 HE 0230-4323 HS* 02 32 54.6772339416 -43 10 27.791218308     13.78     sdB 33 0
21 PG 0258+185 HS* 03 01 12.8738055840 +18 40 53.900691240   15.49 15.41 15.75   sdB+G8 17 1
22 PHL 1472 HS* 03 08 40.7486517408 -02 58 03.153561492   16.1 16.8     sdB 9 0
23 HE 0321-0918 HS* 03 23 45.8458532784 -09 08 15.476673552   15.2       sdB 10 0
24 HE 0415-2417 HS* 04 17 31.4162738640 -24 09 49.914414288 15.16 16.20 16.42 16.6   sdB 8 0
25 HE 0513-2354 HS* 05 15 15.3267036240 -23 51 08.965970352 15.00 16.090 16.116     sdB 8 0
26 HE 0532-4503 HS* 05 33 40.5164632128 -45 01 35.266985868 14.89 15.86 16.08     sdB 22 0
27 HE 0539-4246 HS* 05 41 06.6895089024 -42 45 31.855455504 13.73 14.62 14.85     sdB 11 0
28 EGB 5 HS* 08 11 12.7657907304 +10 57 17.099384400     14.2     sdB 53 1
29 HE 0929-0424 HS* 09 32 02.1130203840 -04 37 36.937709652   16.11 16.16     sdB 21 0
30 PG 1021-029 HS* 10 24 18.0069215952 -03 10 38.115886440   15.3       sdBO 12 0
31 HE 1033-2353 HS* 10 36 07.1192315400 -24 08 35.278081980   16.002 16.206     sdB 8 0
32 HE 1038-2326 HS* 10 40 36.8674785744 -23 42 39.592377972   15.80 15.77 16.03   sdB 11 0
33 PG 1047-046 HS* 10 50 26.8995243000 -04 52 35.718249540   14.68       sdB+D 26 0
34 PG 1050-065 HS* 10 53 26.4666255720 -06 46 14.681150868   14.0       sdB0.2VIIHe12 14 0
35 PG 1140-050 HS* 11 42 57.8414106648 -05 17 14.008752348   14.8       sdB+G1 14 0
36 PG 1200-095 HS* 12 03 21.7167460488 -09 48 05.443110756   16.31 16.43     sdB 8 0
37 PG 1207-033 HS* 12 09 36.0782209128 -03 33 07.573946148   12.49 12.64 13.79   sdB 25 1
38 HE 1221-2618 HS* 12 24 32.6652357000 -26 35 16.632901068   14.83 14.77 14.96   sdB 9 0
39 HE 1254-1540 HS* 12 57 19.3528862544 -15 56 22.666658172   15.47 15.62 15.81   sdB+G0 10 0
40 HE 1309-1102 HS* 13 12 02.3719847664 -11 18 15.161493492   16.1       sdB+G9 7 0
41 HE 1352-1827 HS* 13 55 26.5613874720 -18 42 09.219280032   16.18 16.12 16.11   sdB+G3 8 0
42 LB 721 HS* 14 10 20.7201461808 +00 18 54.848494764   15.5 15.660     sdB 14 1
43 HE 1415-0309 HS* 14 18 20.9257079448 -03 22 53.992919352   16.6   16.3   sdB 14 0
44 HE 1419-1205 HS* 14 22 02.1351352392 -12 19 29.392075560   16.2   16.7   sdB 7 0
45 PG 1421-121 HS* 14 24 08.7743935896 -12 20 20.221592100   15.4   15.77   sdB 14 0
46 HE 1422-1851 HS* 14 24 48.5594394384 -19 05 00.521511576   16.39 16.3     sdB+F9 9 0
47 CBS 275 WD* 14 34 32.7196298904 +45 42 35.523781740   17       DA 16 0
48 HE 1441-0558 HS* 14 44 12.1048056864 -06 10 44.703412824   14.4       sdB+G5 7 0
49 PG 1448-052 HS* 14 51 13.1204893176 -05 23 16.874665800   14.96       sdO8VIIHe0 17 0
50 HE 1450-0957 HS* 14 53 24.1992983688 -10 09 21.837230352   15.10 15.27     sdB 10 0
51 PG 1459-026 HS* 15 02 12.1260326424 -02 45 57.765318336   15.03 15.14     sdB+F2:kA2 20 0
52 PG 1519-071 HS* 15 21 53.1343888872 -07 19 22.586960532   15.6       sdB 10 0
53 PG 1530+057 HS* 15 33 10.7388809784 +05 32 26.849612508 13.573 14.362 14.211 14.049 14.012 sdB 20 0
54 PG 1536+097A HS* 15 38 42.8622621672 +09 34 42.355775604   15.6       sdB+K0 19 0
55 PG 1549-001 HS* 15 52 02.7941520792 -00 04 39.318186396   15.11 15.20 15.73   sdB 17 0
56 HS 1710+1614 HS* 17 13 03.1470866016 +16 10 42.867291432   16.106 16.438     sdB 11 0
57 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2000 0
58 HS 2033+0821 HS* 20 35 29.3361362184 +08 31 51.333663288   14.4       sdB 9 0
59 HS 2043+0615 HS* 20 46 20.7938414832 +06 26 25.336612716   16.9   16.20   sdB 13 0
60 PG 2122+158 HS* 21 24 54.8935500576 +15 59 03.644712528   14.596 14.485 14.710   sdB+F5V 15 1
61 HS 2125+1105 HS* 21 27 32.1684818232 +11 18 16.829735040   15.9   16.4   sdB 10 0
62 BPS CS 30343-0091 HS* 21 38 44.1996638736 -37 36 14.997662460 12.66 13.68 13.9     sdB 21 0
63 HE 2150-0238 HS* 21 52 35.5115148504 -02 24 29.523285216   15.8   16.2   sdB 15 0
64 HE 2151-1001 HS* 21 54 31.5037631664 -09 47 30.184971324   15.6       sdB 10 0
65 HE 2156-1732 HS* 21 59 30.1512110160 -17 18 21.624780528 13.90 14.84 15.07     sdB+F 8 0
66 HE 2156-3927 HS* 21 59 35.5062919224 -39 13 15.015645264     15.06     sdB+K3 11 0
67 PB 5056 HS* 22 04 18.2798373096 +00 12 36.310044060   16.4   16.4   sdB 17 0
68 PG 2208+014 HS* 22 10 45.4719596592 +01 41 35.592852012   15.67 15.74 16.21   sdB 18 0
69 HS 2216+1833 HS* 22 18 30.5893725120 +18 48 08.815445244   13.96 13.90 13.94   sdB+G1 12 0
70 KK 345-30 HS* 22 24 56.4847227576 -37 23 30.359844672     14.89     sdB 13 0
71 PG 2237+018 HS* 22 40 14.2630639896 +02 06 32.184061740   15.78 15.71     sdB 14 0
72 PHL 374 HS* 22 41 38.2312230456 -14 39 38.885529420   16.0 16.8     sdB 9 0
73 PHL 412 HS* 23 10 24.0455833440 -03 24 01.233394344   15.8 16.1     sdB 11 0
74 HE 2322-4559 HS* 23 25 08.9659312272 -45 43 05.482553880   15.5       sdB+G4 9 0
75 LB 1193 HS* 23 25 31.8649619304 -06 01 11.502462648 14.62 14.41 13.64     sdB+G9 14 0
76 Ton S 102 HS* 23 31 49.9502075568 -28 52 52.997322000   13.65 13.86 14.26   sdB 32 0
77 GD 1237 HS* 23 45 26.7041029416 -15 28 38.615838816   15.89 15.86 15.76   sdB 12 0
78 Ton S 124 HS* 23 51 43.6505330328 -31 18 52.943400720   15.63 15.87 16.22   sdBHe0 13 0

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