1997A&AS..125..501J

Query : 1997A&AS..125..501J

1997A&AS..125..501J - Astron. Astrophys., Suppl. Ser., 125, 501-510 (1997/November-1)

The classification of helium-rich hot subdwarfs.

JEFFERY C.S., DRILLING J.S., HARRISON P.M., HEBER U. and MOEHLER S.

Abstract (from CDS):

Spectroscopy has been obtained of 23 subluminous stars, twenty of which had been classified as ``helium-rich subdwarf B stars'' from 10Å resolution spectra. From inspection of the HeII, HeI and Balmer lines, the sample clearly shows a wider range in HeII/HeI and He/H ratios than hitherto supposed for the class. We introduce a classification scheme for helium-rich hot subdwarfs based on 1.5Å spectra of high S/N, which can be extended to include all hot subdwarfs with spectra dominated by H, HeI or HeII. The aim of this classification scheme is to establish reference standards which would be suitable for subsequent fine analysis.

Abstract Copyright: ∼

Journal keyword(s): stars: fundamental parameters - stars: subdwarfs

Simbad objects: 26

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Number of rows : 26
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 US 1184 HS* 10 03 24.1005333816 +46 49 45.747845508   17.2       sdBC0.2VIIHe28 16 0
2 PG 1230+067 HS* 12 33 23.1938541024 +06 25 17.761785240   12.94 13.20 13.52   sdBN0VIIHe39 17 0
3 Ton 107 HS* 12 42 01.7342122248 +43 40 23.421902196   17.0 16.819 17.0   sdBC0.2VIIHe27 28 0
4 PG 1413+114 HS* 14 15 49.0544405496 +11 12 13.919058468 14.58 15.9 16.07 16.0   sdOC9.5VIIHe39 23 0
5 PG 1415+492 HS* 14 17 02.7630761088 +48 57 28.499041188   14.15 14.30 14.67   sdBC1VHe38 23 1
6 PG 1437+727 HS* 14 37 31.8874618464 +72 28 51.694551660   13.74 13.26 15.78   sdO7?He3 12 0
7 PG 1441+407 HS* 14 43 21.3407289240 +40 28 34.202637912   16.00 16.32 16.36   sdO7VIIHe40 18 0
8 PG 1526+440 HS* 15 28 02.5337136168 +43 50 16.562429304   15.39 15.64     sdBC0.2VIIHe26 15 0
9 PG 1544+488 HS* 15 46 11.6930203944 +48 38 37.228874928   12.52 12.79 13.08   sdBC1VIIpHe39 50 1
10 PG 1552+464 WD* 15 54 26.2667529432 +46 17 08.138617800   16.01       DBA 15 0
11 PG 1554+408 HS* 15 55 50.3925461112 +40 38 53.899274760   15.93       sdBN0.2VIIHe39 16 1
12 PG 1559+222 HS* 16 01 13.8144858384 +22 05 46.420001844   14.52       sdBN0.2VIIHe38 13 0
13 PG 1600+171 HS* 16 03 04.0754167728 +16 59 53.911924152   16.3   17.3   sdOC8VIIHe39 16 0
14 HD 144941 pA* 16 09 24.5513020968 -27 13 38.184011148 9.45 10.17 10.02     B8 88 1
15 PG 1607+174 HS* 16 09 54.9286272432 +17 14 57.169399920   11.80 11.64     sdB2VIIHe18 17 0
16 PG 1615+413 HS* 16 17 40.1146040448 +41 12 51.639387624   16.8   17.4   sdBN1VIIHe37 21 0
17 PG 1629+466 HS* 16 31 17.7248247576 +46 31 00.335239068   13.61 13.81 14.12   sdBN0.2VIIHe29 11 0
18 PG 1648+315 HS* 16 50 22.0474121856 +31 27 49.693468896   16.0   15.90   sdBC0.5VIIHe28 15 0
19 PG 1658+273 HS* 17 00 14.1171088704 +27 12 37.301499396   15.75 15.85 16.12   sdOC9.5VIIHe39 10 0
20 PG 1715+273 HS* 17 17 03.1531245432 +27 16 37.013596356   16.6   16.9   sdB1VIIHe35 20 1
21 LS IV +06 2 HS* 18 06 55.4522031744 +06 21 57.246453756   12.11 12.14 12.32   sdBC1VHe39 33 0
22 LS 5121 HS* 18 43 16.6073721048 -18 31 27.933194856 12.8 13.58 13.25 13.39   sdBC0IIHe40 18 0
23 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
24 BD+28 4211 HS* 21 51 11.0221915656 +28 51 50.367627468 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 798 0
25 PG 2215+151 HS* 22 17 48.2204437248 +15 20 57.376954320   14.34 14.53 14.79   sdOC9VIIHe40 20 0
26 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 636 1

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