2012A&A...543A.149G

Query : 2012A&A...543A.149G

2012A&A...543A.149G - Astronomy and Astrophysics, volume 543A149-149 (2012/7-1)

Hot subdwarf stars in close-up view. II. Rotational properties of single and wide binary subdwarf B stars.

GEIER S. and HEBER U.

Abstract (from CDS):

Subluminous B stars (sdBs) form the extremely hot end of the horizontal branch and are therefore related to the blue horizontal branch (BHB) stars. While the rotational properties of BHB stars have been investigated extensively, studies of sdB stars have concentrated on close binaries that are influenced by tidal interactions between their components. Here we present a study of 105 sdB stars, which are either single stars or in wide binaries where tidal effects become negligible. The projected rotational velocities have been determined by measuring the broadening of metal lines using high-resolution optical spectra. All stars in our sample are slow rotators (vrotsini<10km/s). Furthermore, the vrotsin i-distributions of single sdBs are similar to those of hot subdwarfs in wide binaries with main-sequence companions as well as close binary systems with unseen companions and periods exceeding ≃1.2d. We show that blue horizontal and extreme horizontal branch stars are also related in terms of surface rotation and angular momentum. Hot BHB stars (Teff>11500K) with diffusion-dominated atmospheres are slow rotators like the hot subdwarf stars located on the extreme horizontal branch, which lost more envelope and therefore angular momentum in the red-giant phase. The uniform rotation distributions of single and wide binary sdBs pose a challenge to our understanding of hot subdwarf formation. Especially the high fraction of helium white dwarf mergers predicted by theory seems to be inconsistent with the results presented here.

Abstract Copyright: ∼

Journal keyword(s): binaries: spectroscopic - subdwarfs - stars: rotation

Simbad objects: 114

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Number of rows : 114
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 135 HS* 00 03 22.0702217664 -23 38 58.025588136   13.054 13.30     sdBHe1 37 0
2 Ton S 140 HS* 00 06 46.2800590152 -27 20 53.242037196   13.68 13.97     sdO7He1 26 0
3 PHL 699 HS* 00 09 45.9076865640 -21 56 13.704627480   14.84 15.10     sdBHe0 11 0
4 HS 0016+0044 HS* 00 18 43.5160419600 +01 01 23.632082616   14.75 14.88 15.13   sdB1.5VIIHe2 23 0
5 JL 179 HS* 00 21 27.7220609592 -55 29 12.157363032   15.924 16.107 15.668   sdB 11 0
6 Ton S 155 HS* 00 23 59.3423963568 -23 09 53.796509928   16.00 15.94 16.04   sdB 18 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 PG 0057+155 HS* 00 59 56.6673699744 +15 44 13.740284580   12.02 12.32     sdB0.2VIIIpHe8 134 1
10 Ton S 185 HS* 01 03 43.7255136960 -26 51 53.553580668   15.059 15.280 15.299   sdBHe1 21 0
11 Ton S 201 HS* 01 12 11.6603448960 -26 13 27.659728416   13.09 13.71     sdBHe0 66 0
12 JL 236 HS* 01 14 06.6944062536 -52 44 02.168480580   13.18 13.46     sdB 17 0
13 GD 1453 HS* 01 25 22.2863248176 -33 15 09.674055864   15.43 15.64 15.58   sdBHe1 15 0
14 HE 0135-6150 HS* 01 37 30.0320051160 -61 34 58.383423696   16.6   16.1   sdB 6 0
15 Ton S 225 HS* 01 39 14.4741216912 -27 43 21.871673832   16.6 16.17 16.0   sdBHe0 16 0
16 SB 774 HS* 01 53 11.1854953800 -39 04 18.240675816   14.13 14.29 14.51   sdB 16 0
17 PB 8949 HS* 01 56 42.4338931728 -06 55 40.150812828   15.90 16.04 15.72   sdB 15 0
18 PG 0207+005 HS* 02 10 14.9808193560 +00 45 02.229360804   15.27 15.43 15.91   sdB 17 0
19 Ton S 290 HS* 02 56 22.9457786112 -30 06 59.120311644   13.514 13.743 14.203   sdB 12 0
20 PG 0258+185 HS* 03 01 12.8738055840 +18 40 53.900691240   15.49 15.41 15.75   sdB+G8 18 1
21 HE 0321-0918 HS* 03 23 45.8458532784 -09 08 15.476673552   15.2       sdB 11 0
22 EC 03263-6403 HS* 03 27 10.0604472936 -63 52 54.326750232 12.31 13.26 13.48     sdB 14 0
23 PHL 1548 HS* 03 29 07.4100448416 -11 42 20.449002024   12.5 12.7     sdOB 16 0
24 BPS CS 22190-0034 HS* 03 43 09.6214548216 -13 06 00.597681360 12.34 13.39 13.64 13.5   sdB 17 0
25 PG 0342+026 HS* 03 45 34.5760235952 +02 47 52.714095360   10.844 10.926 11.186   sdB3VIIHe4 51 0
26 LB 1695 HS* 03 48 30.8245641120 -50 30 04.813206192 12.41 13.36 13.57 13.84   sdB 12 0
27 CD-32 1567 HS* 04 01 05.3124586656 -32 23 46.025705904 10.03 11.02 11.24     sdB 20 0
28 HE 0415-2417 HS* 04 17 31.4162738640 -24 09 49.914414288 15.16 16.20 16.42 16.6   sdB 8 0
29 HE 0447-3654 HS* 04 49 15.6277550808 -36 49 28.681694040 13.30 14.32 14.58     sdB 12 0
30 [CW83] 0512-08 HS* 05 14 43.9316872560 -08 48 06.372157464   10.97 11.34     sdO 33 0
31 HE 0513-2354 HS* 05 15 15.3267036240 -23 51 08.965970352 15.00 16.090 16.116     sdB 9 0
32 HE 0539-4246 HS* 05 41 06.6895089024 -42 45 31.855455504 13.73 14.62 14.85     sdB 12 0
33 EC 05479-5818 HS* 05 48 45.3192430368 -58 17 24.362915064 11.81 12.852 13.039 13.322   sdB 14 0
34 PG 0909+164 HS* 09 12 07.2920816328 +16 13 20.453857752   13.88 13.851     sdO8VIIHe1 23 0
35 PG 0909+276 HS* 09 12 51.6607835328 +27 20 31.396804260   11.92 12.10 12.62   sdB0.5VIIHe19 48 1
36 GD 108 HS* 10 00 47.2462375824 -07 33 30.773994012 12.406 13.349 13.563 13.662 13.781 sdB 150 1
37 PG 1018-047 HS* 10 21 10.5841130328 -04 56 19.580115516   13.143 13.311     sdB2VIIHe0 30 0
38 PG 1021-029 HS* 10 24 18.0069215952 -03 10 38.115886440   15.3       sdBO 12 0
39 HE 1038-2326 HS* 10 40 36.8674785744 -23 42 39.592377972   15.80 15.77 16.03   sdB 11 0
40 PG 1050-065 HS* 10 53 26.4666255720 -06 46 14.681150868   14.0       sdB0.2VIIHe12 14 0
41 Feige 38 HS* 11 16 49.3630906272 +06 59 33.203109948   12.871 13.096 13.231   sdB1.5VIIHe3 40 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 1200-095 HS* 12 03 21.7167460488 -09 48 05.443110756   16.31 16.43     sdB 9 0
46 PG 1207-033 HS* 12 09 36.0782209128 -03 33 07.573946148   12.49 12.64 13.79   sdB 27 1
47 PG 1219+534 HS* 12 21 29.0914917288 +53 04 36.796062144   12.41       sdB 90 1
48 HE 1221-2618 HS* 12 24 32.6652357000 -26 35 16.632901068   14.83 14.77 14.96   sdB 11 0
49 EC 12234-2607 HS* 12 26 06.1906451568 -26 24 12.167938008   13.58 13.77     sdB 14 0
50 Feige 65 HS* 12 35 51.1437498960 +42 22 39.720230508   11.78 12.046     sdB2 72 1
51 HE 1254-1540 HS* 12 57 19.3528862544 -15 56 22.666658172   15.47 15.62 15.81   sdB+G0 11 0
52 PG 1303+097 HS* 13 06 03.8836777488 +09 24 31.268045124   14.34       sdB 24 0
53 EC 13047-3049 HS* 13 07 31.0220916312 -31 05 01.920479028   12.56 12.83     sdB 13 0
54 V* NY Vir HS* 13 38 48.1466908176 -02 01 49.207286748   13.43 13.66 13.75   sdB1VIIHe1 237 1
55 HE 1352-1827 HS* 13 55 26.5613874720 -18 42 09.219280032   16.18 16.12 16.11   sdB+G3 9 0
56 V* V361 Hya HS* 14 05 33.018072 -27 01 34.01328   15.446 15.258 15.161   sdB+ 129 0
57 LB 721 HS* 14 10 20.7201461808 +00 18 54.848494764   15.5 15.660     sdB 15 1
58 HE 1419-1205 HS* 14 22 02.1351352392 -12 19 29.392075560   16.2   16.7   sdB 7 0
59 HE 1422-1851 HS* 14 24 48.5594394384 -19 05 00.521511576   16.39 16.3     sdB+F9 9 0
60 EC 14248-2647 HS* 14 27 47.3778238176 -27 01 08.750052732   11.67 11.46     sdOB 15 0
61 CBS 275 WD* 14 34 32.7196298904 +45 42 35.523781740   17       DA 17 0
62 PG 1432+004 HS* 14 35 19.8406916232 +00 13 51.115007964   12.20 12.39     sdB2VIIHe6 32 0
63 LB 275 HS* 14 36 07.3336263816 -27 13 14.629148904 13.90 14.87 14.99 15.50   sdB 16 0
64 EC 14338-1445 HS* 14 36 33.7171565280 -14 58 00.887231172   13.47 13.57 13.85   sdB 12 0
65 BPS CS 22871-0023 HS* 14 37 20.4701381256 -17 42 25.269768324   12.90 13.08     sdB 11 0
66 HE 1441-0558 HS* 14 44 12.1048056864 -06 10 44.703412824   14.4       sdB+G5 8 0
67 HE 1450-0957 HS* 14 53 24.1992983688 -10 09 21.837230352   15.10 15.27     sdB 13 0
68 PG 1505+074 HS* 15 08 21.0455212416 +07 13 14.851306956   12.00 11.92 12.95   sdB 19 0
69 EC 15103-1557 HS* 15 13 10.3258120944 -16 08 20.691769416   12.40 12.46     sdB 14 0
70 PG 1519+640 HS* 15 20 31.3676002152 +63 52 08.251179924   12.03 12.18     sdB1.5VIIHe5 43 0
71 PG 1519-071 HS* 15 21 53.1343888872 -07 19 22.586960532   15.6       sdB 10 0
72 PG 1549-001 HS* 15 52 02.7941520792 -00 04 39.318186396   15.11 15.20 15.73   sdB 17 0
73 PG 1605+072 HS* 16 08 03.6872637792 +07 04 28.748468964   12.53 12.83 13.18   sdB0.2VIHe3 136 0
74 PG 1616+144 HS* 16 18 23.0938386048 +14 16 12.892149840   13.48       sdB 22 0
75 PG 1653+131 HS* 16 55 42.8181034632 +13 01 48.511897788   14.18 14.42 14.57   sdB 20 0
76 PG 1710+490 HS* 17 12 18.7556895624 +48 58 35.782284900   12.56 13.03     sdB1.5VIIHe3 39 0
77 HS 1710+1614 HS* 17 13 03.1470866016 +16 10 42.867291432   16.106 16.438     sdB 12 0
78 PG 1725+252 HS* 17 27 57.3822732240 +25 08 35.697468192   11.54 13.01     sdB1.5VIIHe2 29 0
79 [CW83] 1758+36 HS* 18 00 18.8640522672 +36 28 56.335373724 10.04 11.17 11.39 11.38   sdB0 38 1
80 BD+48 2721 HS* 18 34 09.1968898200 +48 27 39.864764700   10.50 10.70     sdB4 27 0
81 KPD 1930+2752 HS* 19 32 14.8088063952 +27 58 35.445679608 12.80 13.75 13.82     sdB 167 0
82 JL 36 HS* 20 01 52.2800951736 -71 57 25.656739308 11.97 12.81 12.95     sdB 25 0
83 EC 20106-5248 HS* 20 14 25.9484491032 -52 39 23.680127664 11.46 12.09 12.30     sdB 19 0
84 EC 20229-3716 HS* 20 26 13.7352932400 -37 06 29.835656208 10.22 11.11 11.33 11.828   sdB 12 0
85 HS 2033+0821 HS* 20 35 29.3361362184 +08 31 51.333663288   14.4       sdB 10 0
86 [DP70] 58 HS* 21 07 31.6822897752 -40 05 47.832831564 11.39 12.63 12.85     sdB 15 0
87 KPD 2109+4401 HS* 21 11 47.6445824136 +44 13 50.620755936 12.14 13.11 13.30 13.64   sdB 72 0
88 PG 2122+158 HS* 21 24 54.8935500576 +15 59 03.644712528   14.596 14.485 14.710   sdB+F5V 16 1
89 HS 2125+1105 HS* 21 27 32.1684818232 +11 18 16.829735040   15.9   16.4   sdB 12 0
90 PHL 44 HS* 21 35 13.3327203264 -13 33 22.555121148 11.77 12.86 13.16     sdB 23 0
91 HD 205805 HS* 21 39 10.6154323536 -46 05 51.525534876 9.05 9.98 10.21     sdB 84 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 HE 2156-3927 HS* 21 59 35.5062919224 -39 13 15.015645264     15.06     sdB+K3 12 0
96 PB 5056 HS* 22 04 18.2798373096 +00 12 36.310044060   16.4   16.4   sdB 17 0
97 PG 2205+023 HS* 22 08 00.6431350584 +02 33 43.529204628   13.96 14.10 14.32   sdB2VIIIpHe0 25 0
98 EC 22081-1916 HS* 22 10 52.8672227976 -19 01 49.632538512   12.82 12.94 13.30   sdB 19 0
99 HS 2216+1833 HS* 22 18 30.5893725120 +18 48 08.815445244   13.96 13.90 13.94   sdB+G1 13 0
100 KK 345-30 HS* 22 24 56.4847227576 -37 23 30.359844672     14.89     sdB 14 0
101 Ton S 61 HS* 22 36 16.6338641856 -31 42 13.008803472   12.905 13.145 13.463   sdO 18 0
102 PG 2237+018 HS* 22 40 14.2630639896 +02 06 32.184061740   15.78 15.71     sdB 14 0
103 PHL 374 HS* 22 41 38.2312230456 -14 39 38.885529420   16.0 16.8     sdB 9 0
104 LB 1516 HS* 23 01 56.1476771616 -48 03 48.474964296   12.74 13.02     sdB 33 0
105 PHL 412 HS* 23 10 24.0455833440 -03 24 01.233394344   15.8 16.1     sdB 11 0
106 Balloon 90100001 HS* 23 15 21.4810390968 +29 05 01.433373360   11.90 12.30     sdB 98 0
107 Feige 109 HS* 23 17 26.8819938360 +07 52 04.910534364       14.166   sdB1.5VIIIpHe0 38 0
108 GD 1110 HS* 23 19 24.4299110400 -08 52 37.936761780   12.778 12.947 13.265 13.179 sdB 43 0
109 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
110 LB 1193 HS* 23 25 31.8649619304 -06 01 11.502462648 14.62 14.41 13.64     sdB+G9 14 0
111 Ton S 102 HS* 23 31 49.9502075568 -28 52 52.997322000   13.65 13.86 14.26   sdB 33 0
112 CD-35 15910 HS* 23 44 22.0084841208 -34 27 00.387634032   10.71 11.00 11.255   sdBHe1 59 0
113 Ton S 124 HS* 23 51 43.6505330328 -31 18 52.943400720   15.63 15.87 16.22   sdBHe0 14 0
114 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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