2010A&A...522A..85S

Query : 2010A&A...522A..85S

2010A&A...522A..85S - Astronomy and Astrophysics, volume 522A85-85 (2010/11-1)

Multiplicity of late-type B stars with HgMn peculiarity.

SCHOELLER M., CORREIA S., HUBRIG S. and AGEORGES N.

Abstract (from CDS):

Observations at various wavelengths of late B-type stars exhibiting strong atmospheric overabundances of the chemical elements Hg and Mn indicate that these stars are frequently found in binary and multiple systems. We intend to study the multiplicity of this type of chemically peculiar stars, looking for visual companions in the range of angular separation between 0.05" and 8". We carried out a survey of 56 stars using diffraction-limited near-infrared imaging with NAOS-CONICA at the VLT. Thirty-three companion candidates in 24 binaries, three triples, and one quadruple system were detected. Nine companion candidates were found for the first time in this study. Five objects are likely chance projections. The detected companion candidates have K magnitudes between 5.95mag and 18.07mag and angular separations ranging from <0.05" to 7.8", corresponding to linear projected separations of 13.5-1700AU. Our study clearly confirms that HgMn stars are frequently members of binary and multiple systems. Taking into account companions found by other techniques, the multiplicity fraction in our sample may be as high as 91%. The membership in binary and multiple systems seems to be a key point to understanding the abundance patterns in these stars.

Abstract Copyright: ∼

Journal keyword(s): binaries: close - stars: chemically peculiar - techniques: high angular resolution

Simbad objects: 66

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Number of rows : 66
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 * 29 Psc V* 00 01 49.4481127032 -03 01 39.011820024 4.47 4.98 5.10     B7III-IV 232 0
2 * alf And a2* 00 08 23.25988 +29 05 25.5520 1.48 1.95 2.06 2.09 2.19 B8IV-VHgMn 479 1
3 V* AV Scl a2* 00 23 12.6093196608 -31 02 08.778859512 6.24 6.484 6.547     B9IV 105 0
4 * 87 Psc SB* 01 14 07.6281618312 +16 08 00.514454568   5.873 5.962     B8III 148 0
5 * phi Phe SB* 01 54 22.0319152104 -42 29 48.942141036   5.055 5.109     A3V 120 0
6 HD 11905 * 01 57 56.3658881952 +41 41 40.421037192   6.685 6.755     B8II 55 0
7 * phi Eri PM* 02 16 30.5860916570 -51 30 43.794586801 3.06 3.45 3.57 3.64 3.75 B8IV 161 0
8 * tet Hyi ** 03 02 15.4488409848 -71 54 08.839047780   5.365 5.499     B8III/IV 102 0
9 * t Tau PM* 03 32 35.9433358944 +09 22 24.419939736 5.39 5.684 5.757     B9III 79 0
10 HD 23950 * 03 49 55.0695142800 +22 14 38.936066064   6.046 6.070     B8III 121 0
11 * ups04 Eri SB* 04 17 53.6624004496 -33 47 54.052408258 3.07 3.44 3.56 3.57 3.68 B8V+B9.5V? 168 0
12 * 53 Tau a2* 04 19 26.0975894496 +21 08 32.298968148   5.413 5.482     B9Vsp 283 0
13 HD 28217 ** 04 27 28.7694788712 +11 12 44.209409004 5.58 5.902 5.870     B8IV 79 0
14 * 93 Tau Pu* 04 40 03.4199311320 +12 11 51.406702908   5.319 5.445     B8IV 83 0
15 HD 31373 * 04 55 50.1515237736 +15 02 24.942409800   5.701 5.776     B9V 72 0
16 * 66 Eri a2* 05 06 45.6527881872 -04 39 18.601025148 4.89 5.06 5.12     B9V 157 1
17 HD 33647 a2* 05 11 41.3498014 +00 30 52.459194   6.601 6.667     B8II/III 99 0
18 * mu. Lep a2* 05 12 55.9029641016 -16 12 19.668599100 2.78 3.18 3.29 3.30 3.42 B9IV:HgMn 294 1
19 * 17 Aur SB* 05 18 18.8960529504 +33 46 02.516925540   6.102 6.144     B9V+B9.5V 308 0
20 HD 34880 SB* 05 20 26.4073556606 -05 22 03.093419327 6 6.37 6.42     B8II 52 0
21 Ass Aur OB 1 As* 05 22 +33.9           ~ 85 0
22 HD 35548 ** 05 25 31.0794483731 -00 32 38.128886484 6.34 6.52 6.56     B9III 159 0
23 HD 36881 SB* 05 35 13.2466726656 +10 14 24.278794332 5.66 5.734 5.638     B9IIIp 70 0
24 NAME Ori I As* 05 38 -02.8           ~ 653 0
25 HD 37752 * 05 41 54.7629137880 +23 19 34.429895148   6.482 6.563     B8p 69 0
26 * 129 Tau * 05 46 45.4968290688 +15 49 20.982467280   5.913 5.994     B8IIIpHg(Mn) 80 0
27 * 64 Ori SB* 06 03 27.3639419184 +19 41 26.026161180   5.021 5.130     B8V 127 0
28 HD 42657 a2* 06 11 43.7171543332 -04 39 55.602985022 5.73 6.10 6.18     B8II/III 62 0
29 * 33 Gem Pe* 06 49 49.8362378064 +16 12 10.382708016 5.24 5.72 5.87     B9III 158 0
30 * 40 Gem ** 06 59 27.9326561760 +25 54 50.987089260 5.71 6.280 6.397     B9III 94 0
31 * gam CMa * 07 03 45.4934693195 -15 37 59.833212992 3.52 4.00 4.12 4.13 4.23 B8II 193 0
32 HD 53929 * 07 07 06.4712319600 +04 54 38.091397320 5.52 5.961 6.088     B9III 105 0
33 BD-11 1951 ** 07 27 51.6595041678 -11 33 24.678706885           F8III+B3V 65 0
34 * zet CMi * 07 51 41.9887267800 +01 46 00.726461076 4.58 5.03 5.16 5.18 5.33 B8II 102 0
35 HD 65950 V* 07 57 45.2194757688 -60 55 35.265618408 6.56 6.86 6.87     B8III 104 0
36 HD 65949 * 07 57 47.6703410424 -60 36 34.921501344 7.99 8.31 8.37     B8/9 108 0
37 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
38 HD 66259 * 07 59 14.6921011440 -60 35 13.574694156 8.26 8.36 8.33     B9.5V 63 0
39 HD 66409 Ro* 07 59 57.8067802465 -60 44 48.469843598 8.08 8.38 8.37     B8IV/V 64 0
40 HD 68099 * 08 11 16.5989180688 +09 49 16.446964692 5.54 5.956 6.072     B6III 62 0
41 V* AO Vel EB* 08 11 53.9160599592 -48 44 46.003619076   9.36 9.37     BpSi+B8V+B9/A0+B9/A0 67 0
42 HD 70235 * 08 19 29.5116324864 -34 35 24.484060464   6.348 6.437     B8Ib/II 39 0
43 * kap02 Vol * 08 20 00.5275254216 -71 30 19.361671236   5.496 5.608     B9/A0IV 77 0
44 HD 71833 * 08 28 53.4289442664 -20 57 01.427571180 6.2 6.611 6.684     B8II 50 0
45 HD 72208 SB* 08 31 54.4939363800 +09 48 50.757520896   6.76 6.83     B9.5VpHgMnEu 61 0
46 * 47 Vel a2* 08 35 52.0273953624 -50 58 10.728609996   5.651 5.782     ApSi 110 0
47 * 14 Hya a2* 08 49 21.7258429872 -03 26 34.891438308 4.87 5.22 5.31     B8IIIpHgMn 154 0
48 * kap Cnc a2* 09 07 44.8095541176 +10 40 05.519586828 4.70 5.13 5.24     B8IIImnp 376 0
49 * L Car * 10 22 58.1465809448 -66 54 05.385596996 4.35 4.86 4.99     B8V 120 0
50 HD 101189 PM* 11 38 07.2695736768 -61 49 35.512404852 4.96 5.13 5.14     ApHgMn 85 0
51 * l Cen ** 12 39 52.5291353564 -39 59 14.286324017 4.16 4.56 4.64 4.66 4.75 B8II/III 122 0
52 * 3 Cen ** 13 51 49.60136 -32 59 38.7067           B5III+B9IV 256 0
53 HD 124740 * 14 16 24.3390568008 -41 13 59.652192144   7.83 7.84     A(pSiCr) 26 0
54 * pi.01 Boo * 14 40 43.5589117488 +16 25 05.975961096 4.18 4.792 4.893 4.47 4.49 B9IIIpHgMnSi 212 0
55 * chi Lup SB* 15 50 57.5453432166 -33 37 37.728345509 3.77 3.909 3.946     B9III 318 0
56 HD 144661 * 16 07 51.8878572504 -24 27 44.447463108 5.74 6.27 6.33     B8IV/V 167 0
57 HD 144844 V* 16 08 43.7202865416 -23 41 07.483461252 5.59 5.90 5.88     B9V 168 0
58 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
59 HD 158704 SB* 17 31 44.3739544896 -26 16 10.957302300   5.983 6.052     B9pHgMn 79 0
60 HD 165493 * 18 08 30.1115839488 -45 46 01.234303212   6.061 6.163     B7/8II 41 0
61 M 16 OpC 18 18 45.1 -13 47 31           ~ 1084 1
62 HD 177863 SB* 19 07 08.3266173557 -18 44 17.407077555   6.243 6.293     B8V 79 0
63 HD 178065 SB* 19 07 09.0293341368 +00 38 27.491355672 6.31 6.584 6.538     B9III 103 0
64 HD 178965 * 19 11 48.2558397312 -28 49 12.110872944   10.42 10.36     B9.5V 7 0
65 * 74 Aqr a2* 22 53 28.7049178152 -11 36 59.453153568 5.41 5.709 5.780     B8IV/V 160 0
66 * bet Scl PM* 23 32 58.2607029954 -37 49 05.825575113 3.92 4.28 4.37 4.37 4.44 B9.5IIIpHgMnSi 194 0

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