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


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET20:19:58

2013A&A...557A.122G - Astronomy and Astrophysics, volume 557A, 122-122 (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 - 2021
#notes
1 Ton S 140 HS* 00 06 46.2797778977 -27 20 53.242413364   13.68 13.97     sdO7He1 21 0
2 CD-38 222 HS* 00 42 58.3082180389 -38 07 37.297565959   10.19 10.26     sdB 48 0
3 JL 236 HS* 01 14 06.6942679012 -52 44 02.167513710   13.18 13.46     sdB 12 0
4 PG 0133+114 HS* 01 36 26.1919154277 +11 39 32.098577898   10.74       sdB1.5VIIHe4 36 0
5 Ton S 290 HS* 02 56 22.9459841812 -30 06 59.122860583           sdB 8 0
6 EC 03263-6403 HS* 03 27 10.0605595899 -63 52 54.326546146 12.31 13.26 13.48     sdB 10 0
7 PHL 1548 HS* 03 29 07.4101121416 -11 42 20.446250956   12.5 12.7     sdOB 10 0
8 BPS CS 22190-0034 HS* 03 43 09.6212594486 -13 06 00.600084942 12.34 13.39 13.64 13.5   sdB 12 0
9 PG 0342+026 HS* 03 45 34.5761491216 +02 47 52.715509702   10.86 11.12 11.20   sdB3VIIHe4 39 0
10 LB 1695 HS* 03 48 30.8249025585 -50 30 04.815877210 12.41 13.36 13.57 13.84   sdB 8 0
11 CD-32 1567 HS* 04 01 05.3124717097 -32 23 46.027281808 10.03 11.02 11.24     sdB 12 0
12 HE 0447-3654 HS* 04 49 15.6277289781 -36 49 28.683173349 13.30 14.32 14.58     sdB 7 0
13 [CW83] 0512-08 HS* 05 14 43.9319875151 -08 48 06.375440271   10.97 11.34     sdO 24 0
14 EC 05479-5818 HS* 05 48 45.3192384978 -58 17 24.361291158 11.81 12.86 13.07     sdB 9 0
15 PG 0909+164 HS* 09 12 07.2920221180 +16 13 20.452538513   13.88 13.851     sdO8VIIHe1 17 0
16 PG 0909+276 HS* 09 12 51.6611095657 +27 20 31.397179258   11.92 12.10 12.62   sdB0.5VIIHe19 32 1
17 GD 108 HS* 10 00 47.2462037648 -07 33 30.777365253 12.406 13.349 13.563 13.662 13.781 sdB 132 1
18 EC 10189-1502 HS* 10 21 21.7558493790 -15 17 17.386963409   13.49 13.76     sdB 5 0
19 Feige 36 HS* 11 04 31.6441819696 +24 39 42.691859421   12.87 12.78     sdB 51 0
20 Feige 38 HS* 11 16 49.3629050435 +06 59 33.210041257   12.77 13.03     sdB1.5VIIHe3 34 1
21 EC 12234-2607 HS* 12 26 06.1906284920 -26 24 12.167556212   13.58 13.77     sdB 9 0
22 Feige 65 HS* 12 35 51.1438949947 +42 22 39.719314185   11.78 12.046     sdB2 61 1
23 PG 1303+097 HS* 13 06 03.8835174426 +09 24 31.271677125   14.34       sdB 14 0
24 EC 13047-3049 HS* 13 07 31.0218854583 -31 05 01.921484737   12.56 12.83     sdB 8 0
25 BD+30 2431 HB* 13 38 24.7655647470 +29 21 56.006946595   9.89 10.02     B5Vp 109 0
26 V* V361 Hya ** 14 05 33.00 -27 01 34.1   15.45 15.26 15.16   sdB+ 110 0
27 EC 14248-2647 HS* 14 27 47.3778313287 -27 01 08.748757384   11.67 11.46     sdOB 9 0
28 EC 14338-1445 HS* 14 36 33.7170604455 -14 58 00.887781699   13.47 13.57 13.85   sdB 9 0
29 PG 1505+074 HS* 15 08 21.0454785177 +07 13 14.849365277   12.00 11.92 12.95   sdB 14 0
30 PG 1519+640 HS* 15 20 31.3674975190 +63 52 08.252610798   12.03 12.18     sdB1.5VIIHe5 35 0
31 PG 1616+144 HS* 16 18 23.0938143530 +14 16 12.893198340   13.48       sdB 15 0
32 PG 1653+131 HS* 16 55 42.8182039082 +13 01 48.514204368   14.18 14.42 14.57   sdB 13 0
33 PG 1710+490 HS* 17 12 18.7559887923 +48 58 35.783945756   12.56 13.03     sdB1.5VIIHe3 31 0
34 PG 1716+426 HS* 17 18 03.8584285848 +42 34 12.566188858   13.69 13.97     sdB2VIIHe3 99 0
35 [CW83] 1758+36 HS* 18 00 18.8642556815 +36 28 56.331953542 10.04 11.17 11.39 11.38   sdB0 30 1
36 BD+48 2721 HS* 18 34 09.1967503177 +48 27 39.863715350   10.50 10.70     sdB4 16 0
37 HD 188112 HS* 19 54 31.4192112333 -28 20 20.679022097   10.01 10.22     sdB 82 0
38 EC 20106-5248 HS* 20 14 25.9492388758 -52 39 23.642950371 11.46 12.09 12.30     sdB 8 0
39 EC 20229-3716 HS* 20 26 13.7349382008 -37 06 29.837403275 10.22 11.11 11.33     sdB 8 0
40 [DP70] 58 HS* 21 07 31.6823526460 -40 05 47.832241231 11.39 12.63 12.85     sdB 11 0
41 PHL 25 HS* 21 32 04.6240474493 -17 18 39.584989278   11.547 10.979     sdB 19 0
42 PHL 44 HS* 21 35 13.3327223484 -13 33 22.555651470 11.77 12.86 13.16     sdB 19 0
43 PG 2151+100 HS* 21 53 57.3054950282 +10 17 35.069381394   12.07 12.34     sdB0VIIHe0 10 0
44 PG 2205+023 HS* 22 08 00.6433236644 +02 33 43.529998644   13.96 14.10 14.32   sdB2VIIIpHe0 15 0
45 EC 22081-1916 HS* 22 10 52.8668128625 -19 01 49.647777951   12.82 12.94 13.30   sdB 14 0
46 Ton S 61 HS* 22 36 16.6334697214 -31 42 13.010850220     12.7     sdB 14 0
47 LB 1516 HS* 23 01 56.1479060808 -48 03 48.478650608   12.74 13.02     sdB 26 0
48 Feige 109 HS* 23 17 26.8818519072 +07 52 04.910090337   13.87 13.92     sdB1.5VIIIpHe0 32 0
49 GD 1110 HS* 23 19 24.4298732999 -08 52 37.939563242   12.78 12.95 13.27   sdB 30 0
50 PG 2317+046 HS* 23 19 55.3508853989 +04 52 34.657092915 11.493 12.630 12.876 12.950 12.994 sdO8VIIHe1 32 0
51 CD-35 15910 HS* 23 44 22.0083303326 -34 27 00.388291721   10.71 11.00     sdBHe1 37 0
52 PG 2349+002 HS* 23 51 53.2309324924 +00 28 17.652251946 12.165 13.086 13.277 13.380 13.496 sdB2VIIHe0 26 0

    Equat.    Gal    SGal    Ecl

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2021.03.01-20:19:58

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