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


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.27CET04:06:55

2010A&A...522A..85S - Astronomy and Astrophysics, volume 522, A85-85 (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 - 2020
#notes
1 * 29 Psc V* 00 01 49.4471402460 -03 01 39.021673975 4.47 4.98 5.10     B7III-IV 200 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 442 0
3 V* AV Scl a2* 00 23 12.6104234764 -31 02 08.784575361 6.24 6.484 6.547     B9IV 89 0
4 * 87 Psc SB* 01 14 07.6269101513 +16 08 00.567100384   5.873 5.962     B8III 133 0
5 * phi Phe SB* 01 54 22.0336599051 -42 29 48.942723263   5.055 5.109     A3V 101 0
6 HD 11905 * 01 57 56.3655897082 +41 41 40.422097670   6.685 6.755     B8II 46 0
7 * phi Eri PM* 02 16 30.5856318 -51 30 43.795513 3.06 3.45 3.57 3.64 3.75 B8IV 135 0
8 * tet Hyi ** 03 02 15.4492873366 -71 54 08.838187640   5.365 5.499     B8III/IV 83 1
9 * t Tau PM* 03 32 35.9434257368 +09 22 24.428651280 5.39 5.684 5.757     B9III 64 0
10 HD 23950 * 03 49 55.0667676722 +22 14 38.950974883   6.046 6.070     B8III 97 0
11 * ups04 Eri SB* 04 17 53.6624067 -33 47 54.056903 3.07 3.44 3.56 3.57 3.68 B9V 141 1
12 * 53 Tau a2* 04 19 26.0972533052 +21 08 32.310998300   5.413 5.482     B9Vsp 253 0
13 HD 28217 ** 04 27 28.7618543551 +11 12 44.290707502 5.58 5.902 5.870     ~ 68 0
14 * 93 Tau * 04 40 03.4217323517 +12 11 51.403129601   5.319 5.445     B8IV 64 0
15 HD 31373 * 04 55 50.1520888638 +15 02 24.957560296   5.701 5.776     B9V 58 0
16 * 66 Eri a2* 05 06 45.6520865479 -04 39 18.590188141 4.89 5.06 5.12     B9V 141 1
17 HD 33647 a2* 05 11 41.3498014 +00 30 52.459194   6.601 6.667     B8II/III 91 0
18 * mu. Lep a2* 05 12 55.9051909878 -16 12 19.653781382 2.78 3.18 3.29 3.30 3.42 B9IV:HgMn 262 1
19 * 17 Aur Al* 05 18 18.8960029818 +33 46 02.520290896   6.102 6.144     B9V+B9.5V 283 0
20 HD 34880 ** 05 20 26.40760 -05 22 03.1015 6 6.364 6.412     B8II 41 1
21 Ass Aur OB 1 As* 05 22 +33.9           ~ 73 0
22 HD 35548 SB* 05 25 31.0806774 -00 32 38.208969 6.34 6.52 6.57     B9III 136 1
23 HD 36881 SB* 05 35 13.2453622858 +10 14 24.316896902 5.66 5.734 5.638     B9IIIp 59 0
24 NAME Ori I As* 05 38 -02.8           ~ 549 0
25 HD 37752 * 05 41 54.7629714306 +23 19 34.432143487   6.482 6.563     B8p 52 0
26 * 129 Tau * 05 46 45.4964977160 +15 49 20.985164333   5.913 5.994     B8IIIpHg(Mn) 67 0
27 * 64 Ori SB* 06 03 27.3645153370 +19 41 26.033243498   5.021 5.130     B8V 113 0
28 V* V638 Mon a2* 06 11 43.71590 -04 39 55.5746 5.73 6.10 6.18     B8II/III 55 1
29 * 33 Gem Ro* 06 49 49.8360372292 +16 12 10.393233085 5.24 5.72 5.87     B7III 134 0
30 * 40 Gem * 06 59 27.9323725207 +25 54 50.996557887 5.71 6.280 6.397     B8III 76 0
31 * gam CMa * 07 03 45.4930485 -15 37 59.829971 3.52 4.00 4.12 4.13 4.23 B8II 168 0
32 HD 53929 * 07 07 06.4711056918 +04 54 38.089443562 5.52 5.961 6.088     B9III 84 0
33 BD-11 1951 ** 07 27 51.66072 -11 33 24.7075   6.406 5.868     F8III+B3V 55 1
34 * zet CMi * 07 51 41.9883545798 +01 46 00.735354616 4.58 5.03 5.16 5.18 5.33 B8II 85 0
35 HD 65950 V* 07 57 45.2192862485 -60 55 35.262404426 6.56 6.86 6.87     B8III 76 0
36 HD 65949 * 07 57 47.6708684554 -60 36 34.925238667 7.99 8.31 8.37     B8/9 80 0
37 NGC 2516 OpC 07 58 04 -60 45.2           ~ 579 0
38 HD 66259 * 07 59 14.6922264823 -60 35 13.563546504 8.26 8.36 8.33     B9.5V 51 0
39 HD 66409 * 07 59 57.8051311952 -60 44 48.457534211 8.08 8.40 8.41     B8IV/V 46 0
40 HD 68099 * 08 11 16.5992065556 +09 49 16.476129304 5.54 5.956 6.072     B6III 51 0
41 V* AO Vel Al* 08 11 53.9159435726 -48 44 46.001523241   9.36 9.37     BpSi+B8V+B9/A0+B9/A0 55 0
42 HD 70235 * 08 19 29.5114519290 -34 35 24.480184361   6.348 6.437     B8Ib/II 29 0
43 * kap02 Vol * 08 20 00.5278529448 -71 30 19.362861898   5.496 5.608     B9/A0IV 61 0
44 HD 71833 * 08 28 53.4291055517 -20 57 01.423429938 6.2 6.611 6.684     B8II 37 0
45 HD 72208 SB* 08 31 54.4941644025 +09 48 50.760221045   6.76 6.83     B9.5VpHgMnEu 45 0
46 V* HV Vel a2* 08 35 52.0279727187 -50 58 10.731377779   5.651 5.782     ApSi 97 0
47 * 14 Hya a2* 08 49 21.7272139537 -03 26 34.882135774 4.87 5.22 5.31     B8IIIpHgMn 139 0
48 * kap Cnc a2* 09 07 44.8101438776 +10 40 05.527005225 4.70 5.13 5.24     B8IIImnp 351 0
49 * L Car * 10 22 58.1460612 -66 54 05.390302 4.35 4.86 4.99     B8V 99 0
50 HD 101189 PM* 11 38 07.2766270609 -61 49 35.555230094 4.96 5.13 5.14     ApHgMn 71 0
51 * l Cen PM* 12 39 52.5283944 -39 59 14.290592 4.16 4.56 4.64 4.66 4.75 B8II/III 103 1
52 * 3 Cen ** 13 51 49.60136 -32 59 38.7067           B5III+B9IV 239 0
53 HD 124740 * 14 16 24.3386600275 -41 13 59.647009626   7.83 7.84     A(pSiCr) 18 0
54 * pi.01 Boo * 14 40 43.5583584090 +16 25 05.960136146 4.18 4.792 4.893 4.47 4.49 B9IIIpHgMnSi 190 0
55 * chi Lup SB* 15 50 57.5382881 -33 37 37.795321 3.77 3.909 3.946     B9III 285 0
56 HD 144661 * 16 07 51.8887183774 -24 27 44.457002869 5.74 6.27 6.33     B8IV/V 142 0
57 HD 144844 V* 16 08 43.7199351602 -23 41 07.451972503 5.59 5.90 5.88     B9V 135 0
58 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1087 1
59 HD 158704 ** 17 31 44.3616361988 -26 16 11.114866170   5.983 6.052     B9Iab 63 0
60 HD 165493 * 18 08 30.1120721532 -45 46 01.232287423   6.061 6.163     B7/8II 32 1
61 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 924 2
62 HD 177863 SB* 19 07 08.3281460860 -18 44 17.402016979   6.243 6.293     B8V 68 0
63 HD 178065 SB* 19 07 09.0290270150 +00 38 27.495717066 6.31 6.584 6.538     B9III 90 0
64 HD 178965 * 19 11 48.2560976559 -28 49 12.111288303   10.42 10.36     B9.5V 5 0
65 * 74 Aqr a2* 22 53 28.7050718506 -11 36 59.449250208 5.41 5.709 5.780     B8IV/V 142 2
66 * bet Scl PM* 23 32 58.2589788 -37 49 05.757000 3.92 4.28 4.37 4.37 4.44 B9.5IIIpHgMnSi 164 0

    Equat.    Gal    SGal    Ecl

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2020.01.27-04:06:55

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