2011MNRAS.415.1381C

Query : 2011MNRAS.415.1381C

2011MNRAS.415.1381C - Mon. Not. R. Astron. Soc., 415, 1381-1395 (2011/August-1)

Radial-velocity measurements of subdwarf B stars.

COPPERWHEAT C.M., MORALES-RUEDA L., MARSH T.R., MAXTED P.F.L. and HEBER U.

Abstract (from CDS):

Subdwarf B (sdB) stars are hot, subluminous stars which are thought to be core-helium burning with thin hydrogen envelopes. The mechanism by which these stars lose their envelopes has been controversial, but it has been argued that binary star interaction is the main cause. Over the past decade we have conducted a radial-velocity study of a large sample of sdB stars, and have shown that a significant fraction of the field sdB population exists in binary systems. In 2002 and 2003, we published 23 new binary sdB stars and the definitions of their orbits. Here, we present the continuation of this project. We give the binary parameters for 28 systems, 18 of which are new. We also present our radial-velocity measurements of a further 108 sdBs. Of these, 88 show no significant evidence of orbital motion. The remaining 20 do show radial-velocity variations, and so are good candidates for further study. Based on these results, our best estimate for the binary fraction in the sdB population is 46-56 per cent. This is a lower bound since the radial-velocity variations of very long period systems would be difficult to detect over the baseline of our programme, and for some sources we have only a small number of measurements.

Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS

Journal keyword(s): binaries: close - binaries: spectroscopic - subdwarfs

Simbad objects: 110

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Number of rows : 110
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 PG 0004+133 HS* 00 07 33.7731772800 +13 35 57.590895264   12.63 13.02     sdB2.5VHe7 36 0
3 PG 0005+179 HS* 00 08 17.7769935240 +18 07 58.466942256   14.18 14.43 14.78   sdB 14 0
4 CD-48 106 HS* 00 31 41.6505545016 -47 25 20.030088576   12.12 12.45     sdB 37 0
5 PG 0039+049 HS* 00 42 06.1225924704 +05 09 23.394042396 11.987 12.858 12.877 12.810 12.713 sdB+G2V 41 0
6 EC 00404-4429 HS* 00 42 48.3762666960 -44 13 25.218650964   13.0 13.4     sdB 20 0
7 CD-38 222 HS* 00 42 58.3063027488 -38 07 37.291406772   10.19 10.26     sdB 67 0
8 PB 8555 ** 01 10 12.704760 -14 07 57.80424   12.61 12.31 12.26   sdBHe0+F/G 12 1
9 JL 236 HS* 01 14 06.6944062536 -52 44 02.168480580   13.18 13.46     sdB 17 0
10 V* EO Cet HS* 01 23 43.2471248112 -05 05 45.831024564   12.21 12.65     sdOV+F4V 68 0
11 EC 02200-2338 HS* 02 22 19.8375036240 -23 24 55.937378952   11.79 12.01     sdB 17 0
12 Ton S 290 HS* 02 56 22.9457786112 -30 06 59.120311644   13.514 13.743 14.203   sdB 12 0
13 KPD 0311+4801 PN 03 14 45.9179057208 +48 12 05.898601584 13.03 14.209 14.449 14.782   DA.5 27 0
14 EC 03143-5945 HS* 03 15 30.0668968296 -59 34 04.938127608 12.79 13.477 13.376 13.542   sdB 12 0
15 PHL 8667 HS* 03 26 17.3707117416 -06 59 43.945668924   12.805 12.581 12.696   sdB+F 11 0
16 EC 03263-6403 HS* 03 27 10.0604472936 -63 52 54.326750232 12.31 13.26 13.48     sdB 14 0
17 BPS CS 22190-0034 HS* 03 43 09.6214548216 -13 06 00.597681360 12.34 13.39 13.64 13.5   sdB 17 0
18 LB 1695 HS* 03 48 30.8245641120 -50 30 04.813206192 12.41 13.36 13.57 13.84   sdB 12 0
19 EC 03568-4849 HS* 03 58 17.4538430184 -48 41 06.912868236 12.82 13.595 13.753 14.149   sdB 8 0
20 CD-32 1567 HS* 04 01 05.3124586656 -32 23 46.025705904 10.03 11.02 11.24     sdB 20 0
21 EC 04070-2122 HB* 04 09 11.7466565928 -21 14 37.536805824 11.88 12.49 12.63     B8 4 0
22 KUV 04110+1434 HS* 04 13 49.5105959424 +14 41 25.951180344   14.13 13.66 13.75   sdB 8 0
23 EC 04170-3433 * 04 18 53.500 -34 26 31.10 11.42 11.41 11.22     F0+sd? 3 0
24 EC 04284-2758 HS* 04 30 27.1655088552 -27 52 21.009180108 12.23 13.293 13.514 13.838   sdB 11 0
25 CD-38 1780 RR* 04 53 14.4111477168 -37 49 15.924408168 13.00 12.17 12.44     A 43 0
26 EC 04589-2945 HS* 05 00 54.4016303856 -29 41 21.635854008 12.23 13.275 13.504 13.909   sdB 8 0
27 CD-28 1974 ** 05 07 20.178432 -28 02 24.88308 11.06 11.793 11.697 11.744   sdB+F 16 0
28 EC 05479-5818 HS* 05 48 45.3192430368 -58 17 24.362915064 11.81 12.852 13.039 13.322   sdB 14 0
29 HD 51155 HS* 06 55 18.2185372800 -23 32 16.595689920   9.38 9.49     sdB 23 0
30 RL 149 HS* 07 24 14.3741784768 -00 33 04.165016904 12.958 13.737 13.866 13.906 13.974 sdB 114 0
31 PG 0749+658 HS* 07 54 24.4160371008 +65 42 07.368520572   12.07 12.06 12.29   sdB 34 0
32 HD 80836 HS* 09 20 34.0077187584 -45 35 20.344261488   9.61 9.64     sdB 12 0
33 Ton 13 HS* 09 22 39.8341061496 +27 02 25.424125980   12.27 12.658     sdB 43 0
34 PG 0934+186 HS* 09 37 16.2701312016 +18 25 11.246800692   12.85 13.13 13.44   sdB 30 0
35 EC 09436-0929 HS* 09 46 07.9877586912 -09 43 06.775367844   14.4 14.45     sdB 7 0
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 1000+408 HS* 10 03 54.2702671056 +40 34 18.121531548 11.919 12.988 13.318 13.465 13.631 sdO 38 0
38 EC 10189-1502 HS* 10 21 21.7555680888 -15 17 17.384825832   13.49 13.76     sdB 7 0
39 BPS BS 17582-0060 HS* 10 30 43.0749010080 -16 20 36.840582744   13.29 13.33 13.43   sdB 8 0
40 Ton 1281 HS* 10 43 39.3538600656 +23 09 06.269551416   13.05 13.371     sdB+G1V 21 0
41 EC 11349-2753 HS* 11 37 29.0994076488 -28 09 43.281741492   12.49 12.68     sdB 12 0
42 EC 12234-2607 HS* 12 26 06.1906451568 -26 24 12.167938008   13.58 13.77     sdB 14 0
43 PG 1230+052 HS* 12 33 12.5632632624 +04 57 37.603907964   13.26       sdB 29 0
44 EC 12376-2049 HS* 12 40 18.9195167496 -21 06 11.249463096   13.42 13.70     sdB 7 0
45 EC 12408-1427 HS* 12 43 30.0485330304 -14 43 49.213141860   12.63 12.82 13.19   sdB 16 0
46 PG 1244+113 HS* 12 47 06.6307680456 +11 03 13.355520768   13.05       sdB 26 0
47 EC 12473-3046 ** 12 50 02.077920 -31 02 55.25124   13.83 13.74 13.86   ~ 4 0
48 Ton 139 HS* 12 56 04.893960 +28 07 19.51716   12.922 12.759 12.866   sdB+F8V 54 0
49 EC 12578-2107 HS* 13 00 32.7176133240 -21 23 57.096743028   13.39 13.54     sdB 11 0
50 EC 13047-3049 HS* 13 07 31.0220916312 -31 05 01.920479028   12.56 12.83     sdB 13 0
51 EC 13332-1424 HS* 13 35 53.4857103648 -14 40 13.103444676   13.15 13.38 13.75   sdB 15 0
52 Feige 87 HS* 13 40 14.6950103088 +60 52 47.566392996   11.56 11.71     sdB+G4V 49 0
53 EC 13506-3137 HS* 13 53 29.9174618040 -31 52 35.451664824   13.82 13.97     sdB 7 0
54 Ton 183 HS* 14 05 59.8351289568 +31 24 36.712574280   13.31 13.49 13.81   sdB 27 0
55 EC 14230-2231 HS* 14 25 53.3260775088 -22 45 13.903372044   13.72 13.96     sdB 6 0
56 EC 14338-1445 HS* 14 36 33.7171565280 -14 58 00.887231172   13.47 13.57 13.85   sdB 12 0
57 BPS CS 22871-0023 HS* 14 37 20.4701381256 -17 42 25.269768324   12.90 13.08     sdB 11 0
58 PG 1439-013 HS* 14 42 27.4791337968 -01 32 45.895458264   13.678 13.873 14.288   sdO 26 0
59 PG 1452+198 HS* 14 54 39.8152055328 +19 37 00.855649740   12.30 12.94     sdB0.5VIIIHe7 26 0
60 EC 15103-1557 HS* 15 13 10.3258120944 -16 08 20.691769416   12.40 12.46     sdB 14 0
61 PG 1519+640 HS* 15 20 31.3676002152 +63 52 08.251179924   12.03 12.18     sdB1.5VIIHe5 43 0
62 PG 1526+132 HS* 15 28 33.9253726824 +13 00 55.299878892   14.23 14.31 14.46   sdB 10 0
63 PG 1528+104 HS* 15 31 10.3888662624 +10 15 00.931449960   13.90 14.14     sdB 24 0
64 PG 1533+467 * 15 34 42.6023858640 +46 31 47.904879756   10.66 10.78     sd 16 0
65 PG 1551+256 HS* 15 53 21.6650183848 +25 24 13.460490548   13.87 13.81 13.98   sdB+K3V 8 1
66 PG 1558-007 HS* 16 01 13.9990783584 -00 51 42.013061064   13.49 13.54     sdB3VIIHe3 15 1
67 PG 1610+519 HS* 16 12 00.5643214080 +51 49 43.252594428   13.60 13.72 13.96   sdO8VIHe1 29 0
68 PG 1618+563 HS* 16 19 26.9188578888 +56 06 01.009178568       13.93   sdB0VIIHe8 31 2
69 KUV 16256+4034 HS* 16 27 16.5352528272 +40 27 28.845006264   12.41 12.64 13.00   sdB 29 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 1648+536 HS* 16 49 59.8505534472 +53 31 31.719097380 12.811 13.835 14.050 14.140 14.264 sdB1VIIHe0 34 0
72 PG 1701+359 HS* 17 03 21.4582783560 +35 48 49.223998800   13.41       sdB1VIHe0 36 0
73 BPS CS 22964-0098 HS* 19 54 14.9335929744 -42 07 05.030199660 12.78 13.71 13.90     sdB 13 0
74 JL 36 HS* 20 01 52.2800951736 -71 57 25.656739308 11.97 12.81 12.95     sdB 25 0
75 EC 19590-5200 HS* 20 02 52.3514321376 -51 52 22.026985104 12.71 13.71 13.94 14.220   sdB 8 0
76 EC 20106-5248 HS* 20 14 25.9484491032 -52 39 23.680127664 11.46 12.09 12.30     sdB 19 0
77 CD-40 13747 HS* 20 15 04.7880723672 -40 05 44.110361148 11.91 12.09 11.82     sdO 53 0
78 EC 20182-6534 HS* 20 22 51.3035537112 -65 25 20.436341088 12.17 13.09 13.29 13.58   sdB 14 0
79 KPD 2022+2033 HS* 20 25 10.8066745872 +20 43 54.253770420 12.99 13.62 13.67 13.80   sdB 9 0
80 EC 20228-3628 HS* 20 26 05.8815095064 -36 18 21.877182324 13.30 13.96 13.84 14.005   sdB+F 6 0
81 EC 20229-3716 HS* 20 26 13.7352932400 -37 06 29.835656208 10.22 11.11 11.33 11.828   sdB 12 0
82 EC 20260-4757 HS* 20 29 34.1085324120 -47 47 26.297317176 12.47 13.55 13.73 14.12   sdB 13 0
83 EC 20369-1804 HS* 20 39 46.3765474896 -17 54 04.928674680 11.96 13.08 13.35 13.69   sdB 10 0
84 EC 20387-1716 HS* 20 41 36.2172004008 -17 05 55.501232136 13.53 14.063 13.728 13.863   sdB+F 5 0
85 KPD 2040+3955 HS* 20 42 33.9314151936 +40 05 41.601180120 13.62 14.34 14.48 14.59   sdB 20 0
86 PG 2059+013 HS* 21 02 19.3101414456 +01 32 15.638581932   14.9   15.38   sdB1VIHe13 22 0
87 [DP70] 58 HS* 21 07 31.6822897752 -40 05 47.832831564 11.39 12.63 12.85     sdB 15 0
88 EC 21079-3548 HS* 21 11 03.4782024552 -35 35 52.831945140 13.06 13.610 13.34 13.257   sdB+F 8 0
89 PG 2110+127 HS* 21 13 21.0605578368 +12 57 09.221687280   13.12 12.96 12.98   sdB 23 0
90 PG 2111+023 HS* 21 13 42.3329406984 +02 33 09.543753036   13.3   13.53   sdB7VHe6 18 0
91 PG 2118+126 HS* 21 21 02.2742484864 +12 50 49.883283600   13.774 13.620 13.631   sdO+F8V 17 0
92 EC 21373-3727 HS* 21 40 22.9012396872 -37 14 15.798439320 12.12 12.57 12.84     sdB+F6V 9 0
93 PG 2148+095 HS* 21 51 16.8856102680 +09 46 59.453038236   13.04 13.04 13.25   sdB0.5VHe2 20 0
94 EC 21494-7018 HS* 21 53 41.2522034136 -70 04 31.442873916 10.50 11.35 11.57     sdB 28 0
95 EC 21556-5552 HS* 21 59 00.6889021608 -55 38 03.714888048 11.94 12.71 12.99     sdB 16 0
96 EC 22081-1916 HS* 22 10 52.8672227976 -19 01 49.632538512   12.82 12.94 13.30   sdB 19 0
97 BPS CS 22956-0094 HS* 22 16 56.0068153032 -64 31 50.157732684 12.27 13.34 13.38 13.50   sdB 18 0
98 KPD 2215+5037 HS* 22 17 20.7353553744 +50 52 58.930200480 12.66 13.59 13.64 14.00   sdB 23 0
99 EC 22143-6122 HS* 22 17 47.4969444240 -61 07 01.385282712 12.96 14.011 14.232 14.627   sdB 9 0
100 PHL 244 HS* 22 22 58.0609082424 -18 19 10.027308396   13.65 13.80 14.13   sdB 12 0
101 PG 2226+094 HS* 22 28 58.4823334800 +09 37 22.473322644   14.18 14.16 14.08   sdB 16 0
102 EC 22464-6822 HS* 22 49 53.1897224832 -68 06 27.510203988 11.30 12.23 12.49     sdO 11 0
103 PB 7394 HS* 22 57 41.4723277704 -13 35 47.685009804   13.624 13.836 14.173   sdB 9 0
104 LB 1516 HS* 23 01 56.1476771616 -48 03 48.474964296   12.74 13.02     sdB 33 0
105 JL 119 HS* 23 02 36.4093491456 -71 13 00.603775596 12.19 13.31 13.63     sdOB 14 0
106 PG 2301+259 HS* 23 04 17.2361877504 +26 12 02.520361800   13.14 13.17 13.34   sdB3IVHe5 17 0
107 EC 23073-6905 HS* 23 10 35.6020735128 -68 49 30.530881056 11.40 12.22 12.33     sdB 16 0
108 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
109 PG 2331+038 HS* 23 33 58.1991530664 +04 03 55.368287928   14.78 14.63 15.19   sdB1.5VIIHe2 24 0
110 EC 23483-6445 HS* 23 51 01.3043643768 -64 28 54.646788252   13.084 13.311 13.672   sdB 10 0

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