2003A&A...402..335A

Query : 2003A&A...402..335A

2003A&A...402..335A - Astronomy and Astrophysics, volume 402, 335-342 (2003/4-4)

Physical parameters of helium-rich subdwarf B stars from medium resolution optical spectroscopy.

AHMAD A. and JEFFERY C.S.

Abstract (from CDS):

Most subdwarf B (sdB) stars have spectra that show helium (He) abundances depleted to a lesser or greater extent. This has been attributed to diffusion and gravitational settling. However a small but significant number of stars with similar temperatures and gravities show relatively strong helium spectra. The question is how these helium-rich sdB (He-sdB) stars are related to their He-deficient counterparts. We present physical parameters for sample of He-sdB stars using line-blanketed LTE models. From the analysis we show that the He-sdB stars are quite distinct from the He-poor sdB. We also explore the idea of a possible link between some extreme helium (EHe) stars and He-rich subdwarf O (He-sdO) stars.

Abstract Copyright: ∼

Journal keyword(s): stars: chemically peculiar - stars: early-type - subdwarfs - stars: atmospheres - stars: fundamental parameters

CDS comments: Table 1: HS 1000+471 is HS 1000+4704 in SIMBAD and HS 1844+637 is NAME HS 1844+637 in SIMBAD (because of the too short format). Paragr.4: D10763 = [MSL2002] J132535.57-472745.1 in SIMBAD.

Simbad objects: 23

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Number of rows : 23
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 PG 0229+064 HS* 02 32 36.3241519488 +06 38 52.138153824   11.97 12.29 12.37   sdB3VHe13 29 0
2 PG 0240+046 HS* 02 43 22.7759776704 +04 50 36.322903536           sdBC0.2VIIHe24 27 0
3 PG 0902+057 HS* 09 05 05.3568844320 +05 33 01.013354316   13.81 14.03     sdBN0VIIHe38 20 0
4 US 1184 HS* 10 03 24.1005333816 +46 49 45.747845508   17.2       sdBC0.2VIIHe28 16 0
5 PG 1127+019 HS* 11 30 03.7029891192 +01 37 37.249820904   13.01 13.853     sdOC9VIIHe40 25 1
6 Ton 107 HS* 12 42 01.7342122248 +43 40 23.421902196   17.0 16.819 17.0   sdBC0.2VIIHe27 28 0
7 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3425 0
8 V* BX Cir Pu* 14 01 36.4829811264 -66 09 56.163698820 11.79 12.62 12.58 12.75   OB+ 59 0
9 PG 1415+492 HS* 14 17 02.7630761088 +48 57 28.499041188   14.15 14.30 14.67   sdBC1VHe38 23 1
10 PG 1544+488 HS* 15 46 11.6930203944 +48 38 37.228874928   12.52 12.79 13.08   sdBC1VIIpHe39 50 1
11 PG 1554+408 HS* 15 55 50.3925461112 +40 38 53.899274760   15.93       sdBN0.2VIIHe39 16 1
12 PG 1600+171 HS* 16 03 04.0754167728 +16 59 53.911924152   16.3   17.3   sdOC8VIIHe39 16 0
13 PG 1615+413 HS* 16 17 40.1146040448 +41 12 51.639387624   16.8   17.4   sdBN1VIIHe37 21 0
14 V* V652 Her pA* 16 48 04.6934854032 +13 15 42.420402252   10.31 10.51     ~ 137 0
15 PG 1658+273 HS* 17 00 14.1171088704 +27 12 37.301499396   15.75 15.85 16.12   sdOC9.5VIIHe39 10 0
16 PG 1715+273 HS* 17 17 03.1531245432 +27 16 37.013596356   16.6   16.9   sdB1VIIHe35 20 1
17 LS IV +06 2 HS* 18 06 55.4522031744 +06 21 57.246453756   12.11 12.14 12.32   sdBC1VHe39 33 0
18 GALEX J184359.8+634652 HS* 18 43 59.8076684664 +63 46 51.698278452   16.3   16.9   sdB1VIIHe39 9 0
19 LS IV -14 116 HS* 20 57 38.8746228912 -14 25 43.991016852 11.63 12.73 13.02 13.28   sdB0.5VIIHe18 79 0
20 Cl* NGC 7078 MHD 2-2 HS* 21 29 34.67 +12 09 19.2   19.2 19.983 20.2   sdBHe 3 0
21 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3138 0
22 PG 2258+155 HS* 23 00 57.7424130816 +15 48 40.451383800   15.03   15.6   sdB0.2VIIHe39 19 0
23 PG 2321+214 HS* 23 24 27.4677335040 +21 38 51.320825304   12.89       sdBN0VIIHe37 23 0

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