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 - 2022
#notes
1 HS 2357+2201 HS* 00 00 18.4044368064 +22 18 02.959056900   13.3       sdB 6 0
2 PG 2359+197 HS* 00 02 08.4740452488 +19 59 13.142278968   14.40       sdB 12 0
3 PHL 699 HS* 00 09 45.9076865640 -21 56 13.704627480   14.84 15.10     sdBHe0 8 0
4 HE 0016+0044 HS* 00 18 43.5160419600 +01 01 23.632082616   14.75 14.88 15.13   sdB1.5VIIHe2 16 0
5 JL 179 HS* 00 21 27.7220609592 -55 29 12.157363032   15.92 16.11     sdB 8 0
6 Ton S 155 HS* 00 23 59.3423963568 -23 09 53.796509928   16.00 15.94 16.04   sdB 14 0
7 Ton S 161 HS* 00 31 12.9491656392 -27 12 54.182178396   15.21 15.13 15.44   sdBHe0+F/G 20 0
8 Ton S 163 HS* 00 33 53.8940926200 -27 08 23.860938912   13.96 14.19 14.48   sdO6He1 34 0
9 GD 656 HS* 00 51 03.9222688464 -19 59 59.319419640   14.56 14.83 15.01   sdBHe0 28 0
10 PG 0057+155 HS* 00 59 56.6673699744 +15 44 13.740284580   12.02 12.32     sdB0.2VIIIpHe8 119 1
11 Ton S 185 HS* 01 03 43.7255136960 -26 51 53.553580668   15.059 15.280 15.299   sdBHe1 16 0
12 GD 687 HS* 01 10 18.6196714608 -34 00 25.710906636   13.89 14.08 14.39   sdBHe1 31 0
13 Ton S 201 HS* 01 12 11.6603448960 -26 13 27.659728416   13.09 13.71     sdBHe0 58 0
14 GD 1453 HS* 01 25 22.2863248176 -33 15 09.674055864   15.43 15.64 15.58   sdBHe1 10 0
15 HE 0135-6150 HS* 01 37 30.0320051160 -61 34 58.383423696   16.6   16.1   sdB 4 0
16 Ton S 225 HS* 01 39 14.4741216912 -27 43 21.871673832   16.6 16.17 16.0   sdBHe0 13 0
17 SB 774 HS* 01 53 11.1854953800 -39 04 18.240675816   14.13 14.29 14.51   sdB 11 0
18 KUV 01542-0710 HS* 01 56 42.4338931728 -06 55 40.150812828   15.90 16.04 15.72   sdB 12 0
19 PG 0207+005 HS* 02 10 14.9808193560 +00 45 02.229360804   15.27 15.43 15.91   sdB 13 0
20 HE 0230-4323 HS* 02 32 54.6772339416 -43 10 27.791218308     13.78     sdB 25 0
21 PG 0258+185 HS* 03 01 12.8738055840 +18 40 53.900691240   15.49 15.41 15.75   sdB+G8 13 1
22 PHL 1472 HS* 03 08 40.7486517408 -02 58 03.153561492   16.1 16.8     sdB 7 0
23 HE 0321-0918 HS* 03 23 45.8458532784 -09 08 15.476673552   15.2       sdB 7 0
24 HE 0415-2417 HS* 04 17 31.4162738640 -24 09 49.914414288 15.16 16.20 16.42 16.6   sdB 6 0
25 HE 0513-2354 HS* 05 15 15.3267036240 -23 51 08.965970352 15.00 16.09 16.16     sdB 5 0
26 HE 0532-4503 HS* 05 33 40.5164632128 -45 01 35.266985868 14.89 15.86 16.08     sdB 18 0
27 HE 0539-4246 HS* 05 41 06.6895089024 -42 45 31.855455504 13.73 14.62 14.85     sdB 7 0
28 EGB 5 HS* 08 11 12.7657907304 +10 57 17.099384400     14.2     sdB 49 1
29 HE 0929-0424 HS* 09 32 02.1130203840 -04 37 36.937709652   16.11 16.16     sdB 19 0
30 PG 1021-029 HS* 10 24 18.0069215952 -03 10 38.115886440   15.3       sdBO 10 0
31 HE 1033-2353 HS* 10 36 07.1192315400 -24 08 35.278081980   16.00 16.21     sdB 6 0
32 HE 1038-2326 HS* 10 40 36.8674785744 -23 42 39.592377972   15.80 15.77 16.03   sdB 6 0
33 PG 1047-046 HS* 10 50 26.8995243000 -04 52 35.718249540   14.68       sdB+D 22 0
34 PG 1050-065 HS* 10 53 26.4666255720 -06 46 14.681150868   14.0       sdB0.2VIIHe12 12 0
35 PG 1140-050 HS* 11 42 57.8414106648 -05 17 14.008752348   14.8       sdB+G1 10 0
36 PG 1200-095 HS* 12 03 21.7167460488 -09 48 05.443110756   16.31 16.43     sdB 6 0
37 PG 1207-033 HS* 12 09 36.0782209128 -03 33 07.573946148   12.49 12.64 13.79   sdB 20 1
38 HE 1221-2618 HS* 12 24 32.6652357000 -26 35 16.632901068   14.83 14.77 14.96   sdB 7 0
39 HE 1254-1540 HS* 12 57 19.3528862544 -15 56 22.666658172   15.47 15.62 15.81   sdB+G0 7 0
40 HE 1309-1102 HS* 13 12 02.3719847664 -11 18 15.161493492   16.1       sdB+G9 5 0
41 HE 1352-1827 HS* 13 55 26.5613874720 -18 42 09.219280032   16.18 16.12 16.11   sdB+G3 6 0
42 LB 721 HS* 14 10 20.7201461808 +00 18 54.848494764   15.5 15.660     sdB 12 1
43 HE 1415-0309 HS* 14 18 20.9257079448 -03 22 53.992919352   16.6   16.3   sdB 9 0
44 HE 1419-1205 HS* 14 22 02.1351352392 -12 19 29.392075560   16.2   16.7   sdB 5 0
45 PG 1421-121 HS* 14 24 08.7743935896 -12 20 20.221592100   15.4   15.77   sdB 12 0
46 HE 1422-1851 HS* 14 24 48.5594394384 -19 05 00.521511576   16.39 16.26     sdB+F9 6 0
47 CBS 275 WD* 14 34 32.7196298904 +45 42 35.523781740   17       DA 11 0
48 HE 1441-0558 HS* 14 44 12.1048056864 -06 10 44.703412824   14.4       sdB+G5 5 0
49 PG 1448-052 HS* 14 51 13.1204893176 -05 23 16.874665800   14.96       sdO8VIIHe0 15 0
50 HE 1450-0957 HS* 14 53 24.1992983688 -10 09 21.837230352   15.10 15.27     sdB 8 0
51 PG 1459-026 HS* 15 02 12.1260326424 -02 45 57.765318336   15.03 15.14     sdB+F2:kA2 16 0
52 PG 1519-071 HS* 15 21 53.1343888872 -07 19 22.586960532   15.6       sdB 8 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 18 0
54 PG 1536+097A HS* 15 38 42.8622621672 +09 34 42.355775604   15.6       sdB+K0 11 0
55 PG 1549-001 HS* 15 52 02.7941520792 -00 04 39.318186396   15.11 15.20 15.73   sdB 15 0
56 HS 1710+1614 HS* 17 13 03.1470866016 +16 10 42.867291432   16.11 16.44     sdB 5 0
57 NGC 6752 GlC 19 10 52.11 -59 59 04.4   6.96 6.28     ~ 1894 0
58 HS 2033+0821 HS* 20 35 29.3361362184 +08 31 51.333663288   14.4       sdB 7 0
59 HS 2043+0615 HS* 20 46 20.7938414832 +06 26 25.336612716   16.9   16.20   sdB 10 0
60 PG 2122+158 HS* 21 24 54.8935500576 +15 59 03.644712528   14.60 14.48 14.71   sdB 10 1
61 HS 2125+1105 HS* 21 27 32.1684818232 +11 18 16.829735040   15.9   16.4   sdB 8 0
62 HE 2135-3749 HS* 21 38 44.1996638736 -37 36 14.997662460 12.66 13.68 13.9     sdB 17 0
63 HE 2150-0238 HS* 21 52 35.5115148504 -02 24 29.523285216   15.8   16.2   sdB 13 0
64 HE 2151-1001 HS* 21 54 31.5037631664 -09 47 30.184971324   15.6       sdB 8 0
65 HE 2156-1732 HS* 21 59 30.1512110160 -17 18 21.624780528 13.90 14.84 15.07     sdB+F 6 0
66 HE 2156-3927 HS* 21 59 35.5062919224 -39 13 15.015645264     15.06     sdB+K3 6 0
67 HE 2201-0001 HS* 22 04 18.2798373096 +00 12 36.310044060   16.4   16.4   sdB 9 0
68 PG 2208+014 HS* 22 10 45.4719596592 +01 41 35.592852012   15.67 15.74 16.21   sdB 13 0
69 HS 2216+1833 HS* 22 18 30.5893725120 +18 48 08.815445244   13.96 13.90 13.94   sdB+G1 7 0
70 HE 2222-3738 HS* 22 24 56.4847227576 -37 23 30.359844672     14.89     sdB 10 0
71 PG 2237+018 HS* 22 40 14.2630639896 +02 06 32.184061740   15.78 15.71     sdB 8 0
72 PHL 374 HS* 22 41 38.2312230456 -14 39 38.885529420   16.0 16.8     sdB 7 0
73 PHL 412 HS* 23 10 24.0455833440 -03 24 01.233394344   15.8 16.1     sdB 9 0
74 HE 2322-4559 HS* 23 25 08.9659312272 -45 43 05.482553880   15.5       sdB+G4 4 0
75 PHL 508 HS* 23 25 31.8649619304 -06 01 11.502462648 14.62 14.41 13.64     sdB+G9 12 0
76 Ton S 102 HS* 23 31 49.9502075568 -28 52 52.997322000   13.65 13.86 14.26   sdB 28 0
77 GD 1237 HS* 23 45 26.7041029416 -15 28 38.615838816   15.89 15.86 15.76   sdB 9 0
78 Ton S 124 HS* 23 51 43.6505330328 -31 18 52.943400720   15.63 15.87 16.22   sdBHe0 10 0

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2022.05.22-00:46:47

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