2013A&A...557A.122G

Query : 2013A&A...557A.122G

2013A&A...557A.122G - Astronomy and Astrophysics, volume 557A122-122 (2013/9-1)

Hot subdwarf stars in close-up view. IV. Helium abundances and the 3He isotopic anomaly of subdwarf B stars.

GEIER S., HEBER U., EDELMANN H., MORALES-RUEDA L., KILKENNY D., O'DONOGHUE D., MARSH T.R. and COPPERWHEAT C.

Abstract (from CDS):

Atmospheric parameters and helium abundances of 44 bright subdwarf B stars have been determined. More than half of our sample consists of newly discovered stars from the Edinburgh Cape survey. We showed that effective temperatures and surface gravities can be derived from high resolution echelle spectra with sufficient accuracy. Systematic uncertainties have been determined by comparing the parameters derived from the high resolution data with the ones derived from medium resolution spectra. Helium abundances have been measured with high accuracy. Besides the known correlation of helium abundance with temperature, two distinct sequences in helium abundance have been confirmed. Significant isotopic shifts of helium lines due to an enrichment in 3He have been found in the spectra of 8 subluminous B stars (sdBs). Most of these stars cluster in a small temperature range between 27000K and 31000K very similar to the known 3He-rich main sequence B stars, which also cluster in such a small strip, but at different temperatures. Both the helium sequences and the isotopic anomaly are discussed.

Abstract Copyright: ∼

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

CDS comments: Table 1 BPS CS 23431-0044 is a pisprint for BPS CS 29491-0044.

Simbad objects: 52

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Number of rows : 52
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Ton S 140 HS* 00 06 46.2800590152 -27 20 53.242037196   13.68 13.97     sdO7He1 26 0
2 CD-38 222 HS* 00 42 58.3063027488 -38 07 37.291406772   10.19 10.26     sdB 67 0
3 JL 236 HS* 01 14 06.6944062536 -52 44 02.168480580   13.18 13.46     sdB 17 0
4 PG 0133+114 HS* 01 36 26.1919824456 +11 39 32.100292692   10.74       sdB1.5VIIHe4 48 0
5 Ton S 290 HS* 02 56 22.9457786112 -30 06 59.120311644   13.514 13.743 14.203   sdB 12 0
6 EC 03263-6403 HS* 03 27 10.0604472936 -63 52 54.326750232 12.31 13.26 13.48     sdB 14 0
7 PHL 1548 HS* 03 29 07.4100448416 -11 42 20.449002024   12.5 12.7     sdOB 16 0
8 BPS CS 22190-0034 HS* 03 43 09.6214548216 -13 06 00.597681360 12.34 13.39 13.64 13.5   sdB 17 0
9 PG 0342+026 HS* 03 45 34.5760235952 +02 47 52.714095360   10.844 10.926 11.186   sdB3VIIHe4 51 0
10 LB 1695 HS* 03 48 30.8245641120 -50 30 04.813206192 12.41 13.36 13.57 13.84   sdB 12 0
11 CD-32 1567 HS* 04 01 05.3124586656 -32 23 46.025705904 10.03 11.02 11.24     sdB 20 0
12 HE 0447-3654 HS* 04 49 15.6277550808 -36 49 28.681694040 13.30 14.32 14.58     sdB 12 0
13 [CW83] 0512-08 HS* 05 14 43.9316872560 -08 48 06.372157464   10.97 11.34     sdO 33 0
14 EC 05479-5818 HS* 05 48 45.3192430368 -58 17 24.362915064 11.81 12.852 13.039 13.322   sdB 14 0
15 PG 0909+164 HS* 09 12 07.2920816328 +16 13 20.453857752   13.88 13.851     sdO8VIIHe1 23 0
16 PG 0909+276 HS* 09 12 51.6607835328 +27 20 31.396804260   11.92 12.10 12.62   sdB0.5VIIHe19 48 1
17 GD 108 HS* 10 00 47.2462375824 -07 33 30.773994012 12.406 13.349 13.563 13.662 13.781 sdB 150 1
18 EC 10189-1502 HS* 10 21 21.7555680888 -15 17 17.384825832   13.49 13.76     sdB 7 0
19 Feige 36 HS* 11 04 31.6443383808 +24 39 42.687580896   12.87 12.78     sdB 59 0
20 Feige 38 HS* 11 16 49.3630906272 +06 59 33.203109948   12.871 13.096 13.231   sdB1.5VIIHe3 40 1
21 EC 12234-2607 HS* 12 26 06.1906451568 -26 24 12.167938008   13.58 13.77     sdB 14 0
22 Feige 65 HS* 12 35 51.1437498960 +42 22 39.720230508   11.78 12.046     sdB2 72 1
23 PG 1303+097 HS* 13 06 03.8836777488 +09 24 31.268045124   14.34       sdB 24 0
24 EC 13047-3049 HS* 13 07 31.0220916312 -31 05 01.920479028   12.56 12.83     sdB 13 0
25 BD+30 2431 HB* 13 38 24.7651989120 +29 21 56.007255024   9.89 10.02     B5Vp 127 0
26 V* V361 Hya HS* 14 05 33.018072 -27 01 34.01328   15.446 15.258 15.161   sdB+ 129 0
27 EC 14248-2647 HS* 14 27 47.3778238176 -27 01 08.750052732   11.67 11.46     sdOB 15 0
28 EC 14338-1445 HS* 14 36 33.7171565280 -14 58 00.887231172   13.47 13.57 13.85   sdB 12 0
29 PG 1505+074 HS* 15 08 21.0455212416 +07 13 14.851306956   12.00 11.92 12.95   sdB 19 0
30 PG 1519+640 HS* 15 20 31.3676002152 +63 52 08.251179924   12.03 12.18     sdB1.5VIIHe5 43 0
31 PG 1616+144 HS* 16 18 23.0938386048 +14 16 12.892149840   13.48       sdB 22 0
32 PG 1653+131 HS* 16 55 42.8181034632 +13 01 48.511897788   14.18 14.42 14.57   sdB 20 0
33 PG 1710+490 HS* 17 12 18.7556895624 +48 58 35.782284900   12.56 13.03     sdB1.5VIIHe3 39 0
34 PG 1716+426 HS* 17 18 03.8584522800 +42 34 12.562847292   13.69 13.97     sdB2VIIHe3 122 0
35 [CW83] 1758+36 HS* 18 00 18.8640522672 +36 28 56.335373724 10.04 11.17 11.39 11.38   sdB0 38 1
36 BD+48 2721 HS* 18 34 09.1968898200 +48 27 39.864764700   10.50 10.70     sdB4 27 0
37 HD 188112 HS* 19 54 31.4191828536 -28 20 20.679710640   10.01 10.22     sdB 101 0
38 EC 20106-5248 HS* 20 14 25.9484491032 -52 39 23.680127664 11.46 12.09 12.30     sdB 19 0
39 EC 20229-3716 HS* 20 26 13.7352932400 -37 06 29.835656208 10.22 11.11 11.33 11.828   sdB 12 0
40 [DP70] 58 HS* 21 07 31.6822897752 -40 05 47.832831564 11.39 12.63 12.85     sdB 15 0
41 PHL 25 HS* 21 32 04.6241025696 -17 18 39.585252816   11.547 10.979     sdB 24 0
42 PHL 44 HS* 21 35 13.3327203264 -13 33 22.555121148 11.77 12.86 13.16     sdB 23 0
43 PG 2151+100 HS* 21 53 57.3047674800 +10 17 35.067185592   12.07 12.34     sdB0VIIHe0 15 0
44 PG 2205+023 HS* 22 08 00.6431350584 +02 33 43.529204628   13.96 14.10 14.32   sdB2VIIIpHe0 25 0
45 EC 22081-1916 HS* 22 10 52.8672227976 -19 01 49.632538512   12.82 12.94 13.30   sdB 19 0
46 Ton S 61 HS* 22 36 16.6338641856 -31 42 13.008803472   12.905 13.145 13.463   sdO 18 0
47 LB 1516 HS* 23 01 56.1476771616 -48 03 48.474964296   12.74 13.02     sdB 33 0
48 Feige 109 HS* 23 17 26.8819938360 +07 52 04.910534364       14.166   sdB1.5VIIIpHe0 38 0
49 GD 1110 HS* 23 19 24.4299110400 -08 52 37.936761780   12.778 12.947 13.265 13.179 sdB 43 0
50 PG 2317+046 HS* 23 19 55.3509680256 +04 52 34.659100740 11.493 12.630 12.876 12.950 12.994 sdO8VIIHe1 39 0
51 CD-35 15910 HS* 23 44 22.0084841208 -34 27 00.387634032   10.71 11.00 11.255   sdBHe1 59 0
52 PG 2349+002 HS* 23 51 53.2310316864 +00 28 17.655587688 12.165 13.086 13.277 13.380 13.496 sdB2VIIHe0 30 0

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