2013A&A...549A.110G

Query : 2013A&A...549A.110G

2013A&A...549A.110G - Astronomy and Astrophysics, volume 549A110-110 (2013/1-1)

Hot subdwarf stars in close-up view. III. Metal abundances of subdwarf B stars.

GEIER S.

Abstract (from CDS):

Hot subdwarf B stars (sdBs) are considered to be core helium-burning stars with very thin hydrogen envelopes situated on or near the extreme horizontal branch. The formation of sdBs is still unclear as well as the chemical composition of their atmospheres. The observed helium depletion is attributed to atmospheric diffusion. Metal abundances have been determined for about a dozen sdBs only resulting in puzzling patterns with enrichment of heavy metals and depletion of lighter ones. We present a detailed metal abundance analysis of 106 sdBs. From high resolution spectra we measured elemental abundances of up to 24 different ions per star. A semi-automatic analysis pipeline was developed to calculate and fit LTE models to a standard set of spectral lines. A general trend of enrichment was found with increasing temperature for most of the heavier elements. The lighter elements like carbon, oxygen, and nitrogen are depleted and less affected by temperature. Although there is considerable scatter from star to star, the general abundance patterns in most sdBs are similar. State-of-the-art diffusion models predict such patterns and are in qualitative agreement with our results. However, the highest enrichments measured cannot be explained with these models. Peculiar line shapes of the strongest metal lines in some stars indicate vertical stratification to be present in the atmospheres. Such effects are not accounted for in current diffusion models and may be responsible for some of the yet unexplained abundance anomalies.

Abstract Copyright: ∼

Journal keyword(s): stars: atmospheres - subdwarfs

VizieR on-line data: <Available at CDS (J/A+A/549/A110): abund.dat>

Simbad objects: 112

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Number of rows : 112
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 HS 2357+2201 HS* 00 00 18.4044368064 +22 18 02.959056900   13.3       sdB 12 0
2 Ton S 135 HS* 00 03 22.0702217664 -23 38 58.025588136   13.054 13.30     sdBHe1 37 0
3 PG 0001+275 HS* 00 03 55.6035118584 +27 48 37.466739936   13.16 13.32 13.60   sdB2VIIHe3 25 0
4 PHL 699 HS* 00 09 45.9076865640 -21 56 13.704627480   14.84 15.10     sdBHe0 11 0
5 HS 0016+0044 HS* 00 18 43.5160419600 +01 01 23.632082616   14.75 14.88 15.13   sdB1.5VIIHe2 23 0
6 JL 179 HS* 00 21 27.7220609592 -55 29 12.157363032   15.924 16.107 15.668   sdB 11 0
7 Ton S 163 HS* 00 33 53.8940926200 -27 08 23.860938912   13.96 14.19 14.48   sdO6He1 38 0
8 HD 4539 HS* 00 47 29.2193758344 +09 58 55.690280832 9.17 10.12 10.24     sdB 101 0
9 GD 656 HS* 00 51 03.9222688464 -19 59 59.319419640   14.56 14.83 15.01   sdBHe0 32 0
10 PG 0057+155 HS* 00 59 56.6673699744 +15 44 13.740284580   12.02 12.32     sdB0.2VIIIpHe8 134 1
11 Ton S 183 HS* 01 01 17.5722745104 -33 42 45.434983572   12.39 14.631 12.95   sdB 53 0
12 Ton S 185 HS* 01 03 43.7255136960 -26 51 53.553580668   15.059 15.280 15.299   sdBHe1 21 0
13 Feige 11 HS* 01 04 21.6747168600 +04 13 37.054495956 10.847 11.826 12.065 12.183 12.324 sdB2VIHe4 136 0
14 GD 687 HS* 01 10 18.6196714608 -34 00 25.710906636   13.89 14.08 14.39   sdBHe1 40 0
15 Ton S 201 HS* 01 12 11.6603448960 -26 13 27.659728416   13.09 13.71     sdBHe0 66 0
16 GD 1453 HS* 01 25 22.2863248176 -33 15 09.674055864   15.43 15.64 15.58   sdBHe1 15 0
17 PG 0133+114 HS* 01 36 26.1919824456 +11 39 32.100292692   10.74       sdB1.5VIIHe4 48 0
18 Ton S 225 HS* 01 39 14.4741216912 -27 43 21.871673832   16.6 16.17 16.0   sdBHe0 16 0
19 CD-24 731 HS* 01 43 48.5449039272 -24 05 10.223541204   11.6 11.9     sdBHe0 71 0
20 SB 774 HS* 01 53 11.1854953800 -39 04 18.240675816   14.13 14.29 14.51   sdB 16 0
21 HE 0230-4323 HS* 02 32 54.6772339416 -43 10 27.791218308     13.78     sdB 35 0
22 HE 0321-0918 HS* 03 23 45.8458532784 -09 08 15.476673552   15.2       sdB 11 0
23 PHL 1548 HS* 03 29 07.4100448416 -11 42 20.449002024   12.5 12.7     sdOB 16 0
24 PG 0342+026 HS* 03 45 34.5760235952 +02 47 52.714095360   10.844 10.926 11.186   sdB3VIIHe4 51 0
25 CD-32 1567 HS* 04 01 05.3124586656 -32 23 46.025705904 10.03 11.02 11.24     sdB 20 0
26 [CW83] 0512-08 HS* 05 14 43.9316872560 -08 48 06.372157464   10.97 11.34     sdO 33 0
27 HE 0532-4503 HS* 05 33 40.5164632128 -45 01 35.266985868 14.89 15.86 16.08     sdB 23 0
28 HE 0539-4246 HS* 05 41 06.6895089024 -42 45 31.855455504 13.73 14.62 14.85     sdB 12 0
29 CPD-64 481 HS* 05 47 59.3028778320 -64 23 03.123185352   10.97 11.17     sdB 44 0
30 EC 05479-5818 HS* 05 48 45.3192430368 -58 17 24.362915064 11.81 12.852 13.039 13.322   sdB 14 0
31 EGB 5 HS* 08 11 12.7657907304 +10 57 17.099384400     14.2     sdB 57 1
32 PG 0909+164 HS* 09 12 07.2920816328 +16 13 20.453857752   13.88 13.851     sdO8VIIHe1 23 0
33 PG 0909+276 HS* 09 12 51.6607835328 +27 20 31.396804260   11.92 12.10 12.62   sdB0.5VIIHe19 48 1
34 HE 0929-0424 HS* 09 32 02.1130203840 -04 37 36.937709652   16.11 16.16     sdB 22 0
35 GD 108 HS* 10 00 47.2462375824 -07 33 30.773994012 12.406 13.349 13.563 13.662 13.781 sdB 150 1
36 PG 1021-029 HS* 10 24 18.0069215952 -03 10 38.115886440   15.3       sdBO 12 0
37 PG 1047-046 HS* 10 50 26.8995243000 -04 52 35.718249540   14.68       sdB+D 26 0
38 PG 1050-065 HS* 10 53 26.4666255720 -06 46 14.681150868   14.0       sdB0.2VIIHe12 14 0
39 Feige 36 HS* 11 04 31.6443383808 +24 39 42.687580896   12.87 12.78     sdB 59 0
40 Feige 38 HS* 11 16 49.3630906272 +06 59 33.203109948   12.871 13.096 13.231   sdB1.5VIIHe3 40 1
41 Ton 63 HS* 11 19 04.8237788448 +29 51 52.663915008   14.11 14.37 14.61   sdB 38 1
42 EC 11349-2753 HS* 11 37 29.0994076488 -28 09 43.281741492   12.49 12.68     sdB 12 0
43 Feige 48 HS* 11 47 14.4978515760 +61 15 31.789400364   13.12 13.28     sdB 125 0
44 Feige 49 HS* 11 47 29.3458678680 -16 05 39.108646068   13.21 12.88     sdOB 22 0
45 PG 1207-033 HS* 12 09 36.0782209128 -03 33 07.573946148   12.49 12.64 13.79   sdB 27 1
46 PG 1219+534 HS* 12 21 29.0914917288 +53 04 36.796062144   12.41       sdB 90 1
47 EC 12234-2607 HS* 12 26 06.1906451568 -26 24 12.167938008   13.58 13.77     sdB 14 0
48 Feige 65 HS* 12 35 51.1437498960 +42 22 39.720230508   11.78 12.046     sdB2 72 1
49 PG 1248+164 HS* 12 50 50.2676425896 +16 10 03.166128120   14.40 14.460     sdB 29 0
50 PG 1303+097 HS* 13 06 03.8836777488 +09 24 31.268045124   14.34       sdB 24 0
51 EC 13047-3049 HS* 13 07 31.0220916312 -31 05 01.920479028   12.56 12.83     sdB 13 0
52 Feige 81 HS* 13 31 53.5517863824 +15 41 17.573728740   13.24 13.507     sdBpec 53 0
53 V* V361 Hya HS* 14 05 33.018072 -27 01 34.01328   15.446 15.258 15.161   sdB+ 129 0
54 LB 721 HS* 14 10 20.7201461808 +00 18 54.848494764   15.5 15.660     sdB 15 1
55 PG 1421-121 HS* 14 24 08.7743935896 -12 20 20.221592100   15.4   15.77   sdB 14 0
56 EC 14248-2647 HS* 14 27 47.3778238176 -27 01 08.750052732   11.67 11.46     sdOB 15 0
57 PG 1432+159 HS* 14 35 18.9439382472 +15 40 14.376188748   13.63       sdB 36 1
58 PG 1432+004 HS* 14 35 19.8406916232 +00 13 51.115007964   12.20 12.39     sdB2VIIHe6 32 0
59 LB 275 HS* 14 36 07.3336263816 -27 13 14.629148904 13.90 14.87 14.99 15.50   sdB 16 0
60 EC 14338-1445 HS* 14 36 33.7171565280 -14 58 00.887231172   13.47 13.57 13.85   sdB 12 0
61 BPS CS 22871-0023 HS* 14 37 20.4701381256 -17 42 25.269768324   12.90 13.08     sdB 11 0
62 PG 1448-052 HS* 14 51 13.1204893176 -05 23 16.874665800   14.96       sdO8VIIHe0 18 0
63 HE 1450-0957 HS* 14 53 24.1992983688 -10 09 21.837230352   15.10 15.27     sdB 13 0
64 PG 1505+074 HS* 15 08 21.0455212416 +07 13 14.851306956   12.00 11.92 12.95   sdB 19 0
65 EC 15103-1557 HS* 15 13 10.3258120944 -16 08 20.691769416   12.40 12.46     sdB 14 0
66 Ton 788 HS* 15 14 32.4559114224 +24 10 40.705772196   13.03 13.21     sdB 42 0
67 PG 1519+640 HS* 15 20 31.3676002152 +63 52 08.251179924   12.03 12.18     sdB1.5VIIHe5 43 0
68 PG 1549-001 HS* 15 52 02.7941520792 -00 04 39.318186396   15.11 15.20 15.73   sdB 17 0
69 PG 1627+017 HS* 16 29 35.3015001600 +01 38 18.794125032   11.32       sdB3VIIHe3 45 0
70 HD 149382 HS* 16 34 23.3333693424 -04 00 52.030152000 7.518 8.661 8.943 9.070 9.205 sdB 149 1
71 PG 1653+131 HS* 16 55 42.8181034632 +13 01 48.511897788   14.18 14.42 14.57   sdB 20 0
72 PG 1710+490 HS* 17 12 18.7556895624 +48 58 35.782284900   12.56 13.03     sdB1.5VIIHe3 39 0
73 PG 1716+426 HS* 17 18 03.8584522800 +42 34 12.562847292   13.69 13.97     sdB2VIIHe3 122 0
74 PG 1725+252 HS* 17 27 57.3822732240 +25 08 35.697468192   11.54 13.01     sdB1.5VIIHe2 29 0
75 PG 1743+477 HS* 17 44 26.3960708352 +47 41 46.918908168   13.68 13.79 13.99   sdB2VIIHe7 35 0
76 [CW83] 1758+36 HS* 18 00 18.8640522672 +36 28 56.335373724 10.04 11.17 11.39 11.38   sdB0 38 1
77 BD+48 2721 HS* 18 34 09.1968898200 +48 27 39.864764700   10.50 10.70     sdB4 27 0
78 HD 171858 HS* 18 37 56.6714756304 -23 11 35.188389420   9.64 9.85     sdB 48 0
79 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
80 KPD 1930+2752 HS* 19 32 14.8088063952 +27 58 35.445679608 12.80 13.75 13.82     sdB 167 0
81 EC 20106-5248 HS* 20 14 25.9484491032 -52 39 23.680127664 11.46 12.09 12.30     sdB 19 0
82 EC 20229-3716 HS* 20 26 13.7352932400 -37 06 29.835656208 10.22 11.11 11.33 11.828   sdB 12 0
83 HS 2033+0821 HS* 20 35 29.3361362184 +08 31 51.333663288   14.4       sdB 10 0
84 LS IV -14 116 HS* 20 57 38.8746228912 -14 25 43.991016852 11.63 12.73 13.02 13.28   sdB0.5VIIHe18 89 0
85 [DP70] 58 HS* 21 07 31.6822897752 -40 05 47.832831564 11.39 12.63 12.85     sdB 15 0
86 KPD 2109+4401 HS* 21 11 47.6445824136 +44 13 50.620755936 12.14 13.11 13.30 13.64   sdB 72 0
87 PHL 44 HS* 21 35 13.3327203264 -13 33 22.555121148 11.77 12.86 13.16     sdB 23 0
88 JL 82 HS* 21 36 01.2957494184 -72 48 27.222290172 11.26 12.44 12.41 12.67   sdB 42 0
89 BPS CS 30343-0091 HS* 21 38 44.1996638736 -37 36 14.997662460 12.66 13.68 13.9     sdB 22 0
90 HD 205805 HS* 21 39 10.6154323536 -46 05 51.525534876 9.05 9.98 10.21     sdB 84 0
91 HE 2150-0238 HS* 21 52 35.5115148504 -02 24 29.523285216   15.8   16.2   sdB 15 0
92 EC 21494-7018 HS* 21 53 41.2522034136 -70 04 31.442873916 10.50 11.35 11.57     sdB 28 0
93 PG 2151+100 HS* 21 53 57.3047674800 +10 17 35.067185592   12.07 12.34     sdB0VIIHe0 15 0
94 HE 2151-1001 HS* 21 54 31.5037631664 -09 47 30.184971324   15.6       sdB 12 0
95 PG 2205+023 HS* 22 08 00.6431350584 +02 33 43.529204628   13.96 14.10 14.32   sdB2VIIIpHe0 25 0
96 PG 2208+014 HS* 22 10 45.4719596592 +01 41 35.592852012   15.67 15.74 16.21   sdB 19 0
97 EC 22081-1916 HS* 22 10 52.8672227976 -19 01 49.632538512   12.82 12.94 13.30   sdB 19 0
98 KK 345-30 HS* 22 24 56.4847227576 -37 23 30.359844672     14.89     sdB 14 0
99 Ton S 61 HS* 22 36 16.6338641856 -31 42 13.008803472   12.905 13.145 13.463   sdO 18 0
100 PHL 374 HS* 22 41 38.2312230456 -14 39 38.885529420   16.0 16.8     sdB 9 0
101 PB 7352 HB* 22 55 43.1874214920 -06 59 39.865486164   12.09 12.21     sd 22 0
102 LB 1516 HS* 23 01 56.1476771616 -48 03 48.474964296   12.74 13.02     sdB 33 0
103 PHL 412 HS* 23 10 24.0455833440 -03 24 01.233394344   15.8 16.1     sdB 11 0
104 Balloon 90100001 HS* 23 15 21.4810390968 +29 05 01.433373360   11.90 12.30     sdB 98 0
105 Feige 109 HS* 23 17 26.8819938360 +07 52 04.910534364       14.166   sdB1.5VIIIpHe0 38 0
106 GD 1110 HS* 23 19 24.4299110400 -08 52 37.936761780   12.778 12.947 13.265 13.179 sdB 43 0
107 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
108 Ton S 102 HS* 23 31 49.9502075568 -28 52 52.997322000   13.65 13.86 14.26   sdB 33 0
109 CD-35 15910 HS* 23 44 22.0084841208 -34 27 00.387634032   10.71 11.00 11.255   sdBHe1 59 0
110 PG 2345+318 HS* 23 48 07.5058804680 +32 04 48.038131020   13.99 14.19 14.66   sdB 32 0
111 Ton S 124 HS* 23 51 43.6505330328 -31 18 52.943400720   15.63 15.87 16.22   sdBHe0 14 0
112 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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