2008A&A...485...95M

Query : 2008A&A...485...95M

2008A&A...485...95M - Astronomy and Astrophysics, volume 48595-105 (2008/7-1)

Membership, binarity, and rotation of F-G-K stars in the open cluster Blanco 1.

MERMILLIOD J.-C., PLATAIS I., JAMES D.J., GRENON M. and CARGILE P.A.

Abstract (from CDS):

The nearby open cluster Blanco 1 is of considerable astrophysical interest for formation and evolution studies of open clusters because it is the third highest Galactic latitude cluster known. It has been observed often, but so far no definitive and comprehensive membership determination is readily available. An observing programme was carried out to study the stellar population of Blanco 1, and especially the membership and binary frequency of the F5-K0 dwarfs. We obtained radial-velocities with the CORAVEL spectrograph in the field of Blanco 1 for a sample of 148 F-G-K candidate stars in the magnitude range 10<V<14. New proper motions and UBVI CCD photometric data from two extensive surveys were obtained independently and are used to establish reliable cluster membership assignments in concert with radial-velocity data. The membership of 68 stars is confirmed on the basis of proper motion, radial velocity, and photometric criteria. Fourteen spectroscopic- and suspected binaries (2 SB2s, 9 SB1s, 3 SB?) have been discovered among the confirmed members. Thirteen additional stars are located above the main sequence or close to the binary ridge, with radial velocities and proper motions supporting their membership. These are probable binaries with wide separations. Nine binaries (7 SB1 and 2 SB2) were detected among the field stars. The spectroscopic binary frequency among members is 20% (14/68); however, the overall binary rate reaches 40% (27/68) if one includes the photometric binaries. The cluster mean heliocentric radial velocity is +5.53±0.11km/s based on the most reliable 49 members. The Vsini distribution is similar to that of the Pleiades, confirming the age similarities between the two clusters. This study clearly demonstrates that, in spite of the cluster's high Galactic latitude, three membership criteria - radial velocity, proper motion, and photometry - are necessary for performing a reliable membership selection. Furthermore, even with accurate and extensive data, ambiguous cases still remain.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: open clusters and associations: general - Galaxy: open clusters and associations: individual: Zeta Scl - techniques: radial velocities - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/485/95): table1.dat>

Nomenclature: Table 1: Cl* Blanco 1 MPJ NNN (Nos 330-361).

CDS comments: Table 1, Col(1): (Nos 8-130) = Cl* Blanco 1 WGL NNN, (Nos 330-361) = Cl* Blanco 1 MPJ NNN, (Nos 1013-1258) = Cl* Blanco 1 ZS 13 to Cl* Blanco 1 ZS 258.

Simbad objects: 153

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Number of rows : 153
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 TYC 6418-230-1 SB* 00 00 11.3294240616 -29 50 42.518037768   12.46 11.63     ~ 7 0
2 CD-31 19545 * 00 00 12.0374433864 -30 20 50.362105200   11.55 10.85     ~ 10 0
3 CD-29 18916 ** 00 00 35.3831428272 -29 15 48.299859684   11.37 10.98 11.03   ~ 13 0
4 BSD 140-89 * 00 00 37.0534001784 -30 11 54.742468992   11.37 11.95     ~ 5 0
5 CD-29 18918 * 00 00 45.0159077208 -29 06 30.236784480   13.20 12.25     ~ 4 0
6 CD-29 18919 * 00 00 46.6001455752 -29 08 05.652980268   11.55 11.04     ~ 5 0
7 CD-30 19774 * 00 00 49.6746935160 -29 21 27.392555484   12.29 11.77     ~ 5 0
8 Cl* Blanco 1 ZS 21 * 00 01 06.2388913344 -30 14 46.073867964   14.23 13.43     ~ 9 0
9 Cl* Blanco 1 MPJ 334 Ro* 00 01 08.4150611736 -28 36 56.508366600   12.06 11.63     ~ 22 0
10 Cl* Blanco 1 MPJ 1025 * 00 01 10.3049 -30 36 24.840   13.79 12.74     ~ 5 0
11 Cl* Blanco 1 MPJ 351 Ro* 00 01 13.9966485240 -29 25 18.179210244   13.20 12.38     ~ 25 0
12 CD-29 18924 * 00 01 15.5929184760 -28 29 35.584056600   11.226 10.724     ~ 8 0
13 CD-31 19554 * 00 01 24.4791618672 -30 38 58.324810668   10.914 10.482     ~ 48 0
14 CD-30 19779 Ro* 00 01 28.6749502416 -30 12 21.008403540   11.30 10.81     ~ 35 0
15 Cl* Blanco 1 ZS 33 * 00 01 29.4459841728 -30 24 24.424408512   14.81 14.01     ~ 12 0
16 UCAC4 299-000033 Er* 00 01 30.3948519648 -30 13 08.395386096   13.120 12.387 12.381   ~ 13 0
17 Cl* Blanco 1 ZS 31 Ro* 00 01 33.2000249472 -30 12 59.648937120     12.60     ~ 31 0
18 CD-29 18928 PM* 00 01 42.3693347832 -29 08 33.590136624   11.840 11.176 10.69 10.284 ~ 14 0
19 Cl* Blanco 1 ZS 58 Er* 00 01 46.4700616512 -29 46 38.759396088   12.83 12.21     ~ 41 0
20 CD-30 19783 PM* 00 01 49.0060984992 -29 23 01.482218196   11.851 11.198     ~ 11 0
21 Cl* Blanco 1 ZS 34 * 00 01 49.4955728616 -30 15 12.003888672   13.54 12.93     ~ 9 0
22 CD-29 18931 SB* 00 01 57.4575797616 -29 07 20.334149328   12.81 11.64     ~ 7 0
23 HD 224976 * 00 02 11.9253149232 -30 15 02.916293472   10.36 10.00     F3V 17 0
24 Cl* Blanco 1 ZS 44 Er* 00 02 14.6933278272 -29 49 04.088797212   14.05 12.94     ~ 30 0
25 Cl* Blanco 1 ZS 50 Ro* 00 02 16.9186533984 -30 32 27.234195108   12.40 12.12     ~ 26 0
26 Cl* Blanco 1 ZS 45 Ro* 00 02 18.5541763032 -29 51 08.453919708   13.6 12.87     ~ 34 0
27 CD-30 19788 PM* 00 02 19.7588414304 -29 45 56.156898888   12.54 11.75     ~ 9 0
28 * zet Scl SB* 00 02 19.9270625208 -29 43 13.588516668 4.29 4.879 5.022     B5IV 139 0
29 CD-30 19789 * 00 02 20.7817739160 -29 47 50.406817092   11.26 10.59     ~ 8 0
30 CD-30 19787 Ro* 00 02 21.6371141520 -30 08 21.621740856   11.11 10.62     ~ 43 0
31 CD-29 18935 * 00 02 25.1109069192 -29 05 25.911009564   11.56 11.07     ~ 7 0
32 CD-30 19791 * 00 02 27.2345966400 -29 46 53.612929632   11.76 11.30     ~ 9 0
33 Cl* Blanco 1 ZS 54 Ro* 00 02 28.1916119256 -30 04 43.459142016   13.91 13.04     K4-5V 27 0
34 Cl* Blanco 1 MPJ 336 * 00 02 32.9102862288 -30 59 31.473258576   11.59 11.21     ~ 13 0
35 Cl* Blanco 1 ZS 62 SB* 00 02 35.4578432760 -30 07 01.940181744   13.26 12.52     M4-5V 24 0
36 Cl* Blanco 1 ZS 63 * 00 02 36.1422095184 -30 25 51.001348656   12.488 11.888     ~ 10 0
37 CD-29 18938 SB* 00 02 39.2420794248 -29 04 30.870087708   10.59 10.25     F2V 34 0
38 CD-30 19793 PM* 00 02 43.9332843024 -29 27 07.921004868   12.51 12.29     ~ 7 0
39 Cl* Blanco 1 ZS 70 Ro* 00 02 48.2261979312 -29 46 34.842205956   14.44 13.63     ~ 35 0
40 Cl* Blanco 1 MPJ 337 Ro* 00 02 48.7997949072 -29 18 42.236644788   13.09 12.31     ~ 28 0
41 CD-31 19569 SB* 00 02 52.3507185456 -30 19 58.179557928   12.81 11.99     ~ 12 0
42 Cl* Blanco 1 ZS 76 SB* 00 02 56.3891922408 -30 04 44.872672188   12.98 12.32     ~ 35 0
43 Cl* Blanco 1 ZS 75 * 00 03 00.2764601520 -30 03 21.624708168   13.73 12.89     K4-7V 19 0
44 Cl* Blanco 1 ZS 78 * 00 03 02.8847876016 -30 20 16.488408732   13.97 13.05     ~ 8 0
45 Cl Blanco 1 OpC 00 03 04.1 -29 48 55           ~ 380 0
46 CD-30 19796 Ro* 00 03 06.5175679080 -29 21 44.039991096   12.261 11.637 11.22 10.941 ~ 36 0
47 CD-30 19797 Ro* 00 03 10.8157210080 -30 10 48.969614568   11.87 11.09     ~ 44 0
48 G 267-20 PM* 00 03 11.5226117784 -30 05 03.834184416   13.63 12.46     ~ 12 0
49 CD-31 19572 * 00 03 14.9631858840 -30 18 32.303097288   10.74 10.29     F1-5IV 16 0
50 CD-30 19799 SB* 00 03 16.0295712504 -29 20 00.516092316   11.272 10.675     G0 13 0
51 Cl* Blanco 1 ZS 95 * 00 03 16.4934713400 -29 58 47.436654252   13.26 12.40     ~ 23 0
52 Cl* Blanco 1 MPJ 352 Ro* 00 03 19.8017261568 -29 25 28.735366404   13.62 12.80     ~ 23 0
53 CD-30 19800 Er* 00 03 20.6140352856 -29 49 22.753595676   11.75 11.23     F8 46 0
54 CD-30 19801 SB* 00 03 21.8528903616 -30 01 10.528822956   10.75 10.36     F3V 28 0
55 CD-30 19802 * 00 03 24.3910794816 -29 48 49.446597744   11.07 10.56     F8V 44 0
56 Cl* Blanco 1 ZS 93 Ro* 00 03 24.6749677800 -29 55 14.733336360   14.9 14.18     K5-7V 38 0
57 Cl* Blanco 1 MPJ 348 SB* 00 03 25.0441336416 -30 26 06.259016220   12.86 11.94     ~ 16 0
58 Cl* Blanco 1 ZS 100 SB* 00 03 27.3342954624 -30 26 48.784280568   13.37 12.53     ~ 13 0
59 CD-31 19574 * 00 03 28.9816465104 -30 19 27.207705612   11.030 10.595     F4-6V 47 0
60 CD-31 19576 * 00 03 33.5987668368 -30 28 41.958278292   10.99 10.61     F4-6V 29 0
61 Cl Blanco 1 35 Ro* 00 03 33.6933314400 -30 15 44.044568352   12.81 11.98     ~ 44 0
62 Cl* Blanco 1 MPJ 338 Ro* 00 03 38.5095253296 -28 37 25.396213728   12.93 12.22     ~ 22 0
63 Cl Blanco 1 31 SB* 00 03 50.1716211552 -30 03 55.699032204   11.560 11.054     ~ 42 0
64 CD-31 19579 SB* 00 04 00.0151843920 -30 19 15.836657484   11.49 10.88     ~ 20 0
65 Cl* Blanco 1 MPJ 353 Ro* 00 04 00.8358571464 -29 26 46.292974440   13.37 12.59     ~ 23 0
66 Cl* Blanco 1 ZS 112 Ro* 00 04 04.0229574912 -29 58 26.484825828   13.92 13.06     ~ 30 0
67 Cl* Blanco 1 ZS 111 * 00 04 07.5378517872 -30 06 35.198908992   13.44 12.27     ~ 9 0
68 Cl* Blanco 1 ZS 113 * 00 04 07.7367732696 -29 53 00.562903476   13.78 13.00     ~ 11 0
69 CD-30 19811 SB* 00 04 16.4798591280 -29 44 52.925843976   11.348 10.775     ~ 14 0
70 Cl* Blanco 1 ZS 118 * 00 04 17.4908286000 -30 23 42.478608660   14.02 13.05     ~ 12 0
71 CD-30 19812 * 00 04 18.7457656752 -29 49 32.509726932   10.93 10.46     F6V 17 0
72 Cl* Blanco 1 ZS 124 Ro* 00 04 21.7239525744 -29 45 30.062099628   14.55 13.81     ~ 23 0
73 Cl* Blanco 1 ZS 122 * 00 04 25.2585909528 -30 25 39.751631760   13.37 12.62     ~ 6 0
74 CD-29 18951 * 00 04 27.4871853048 -28 43 46.659233244   11.386 10.891     ~ 8 0
75 Cl* Blanco 1 ZS 129 Ro* 00 04 31.6649755080 -30 14 41.691809328   12.40 11.82     ~ 32 0
76 CD-30 19815 * 00 04 33.1684162920 -29 38 28.042627740   11.576 11.055     F6-8 40 0
77 Cl* Blanco 1 MPJ 354 Ro* 00 04 34.8459422112 -29 15 19.980840420   13.72 12.82     ~ 21 0
78 CD-29 18954 * 00 04 42.8521156152 -29 09 43.564647456   11.671 11.192     ~ 10 0
79 Cl* Blanco 1 ZS 135 Ro* 00 04 43.5457147416 -29 41 04.800565104   14.49 13.76     ~ 33 0
80 CD-30 19817 * 00 04 49.2039609888 -30 00 52.898627700   11.63 11.11     ~ 13 0
81 Cl* Blanco 1 MPJ 359 ** 00 04 54.104136 -29 09 10.90908   13.74 12.77 12.64   ~ 9 0
82 CD-30 19821 Ro* 00 04 58.6385830920 -29 33 47.763998208   12.0 11.52     ~ 34 0
83 Cl Blanco 1 28 Ro* 00 04 58.8405701856 -30 09 41.640563700   11.76 11.22     ~ 40 0
84 CD-29 18957 * 00 05 07.2511232736 -29 13 09.800485824   11.77 11.39     ~ 5 0
85 Cl* Blanco 1 ZS 141 Ro* 00 05 08.2373856000 -30 29 42.132956028   12.64 11.98     ~ 39 0
86 Cl* Blanco 1 ZS 148 SB* 00 05 14.3993177952 -29 54 23.769659736   13.2 12.18     ~ 26 0
87 CD-30 19825 * 00 05 16.3160642592 -29 40 39.610484940   12.10 11.52     ~ 10 0
88 Cl* Blanco 1 ZS 147 Ro* 00 05 17.5553862720 -29 46 57.334864512   14.17 13.44     ~ 35 0
89 CD-30 19826 Er* 00 05 18.3976899840 -29 30 05.629922280   12.02 11.55     ~ 26 0
90 Cl* Blanco 1 ZS 151 * 00 05 20.1505776456 -30 25 22.022008068   13.9 13.11     ~ 13 0
91 Cl* Blanco 1 ZS 153 PM* 00 05 23.5507684512 -30 23 31.952938632   13.11 12.43     ~ 11 0
92 Cl* Blanco 1 ZS 161 SB* 00 05 26.8610473200 -29 51 20.539094328   13.38 12.68     ~ 25 0
93 CD-30 19828 SB* 00 05 29.2644205464 -30 06 54.431604252   12.04 11.25     ~ 11 0
94 CD-30 19829 Ro* 00 05 30.9374971848 -29 53 08.163500496   11.77 11.24 11.18   ~ 35 0
95 Cl* Blanco 1 ZS 154 * 00 05 31.5714811848 -30 20 51.658342440   14.31 13.54     ~ 16 0
96 CD-30 19830 * 00 05 35.0762004384 -30 02 10.046018364   12.27 11.66     ~ 9 0
97 Cl* Blanco 1 ZS 165 SB* 00 05 35.5434453312 -29 57 06.583448412   13.37 12.51 12.42   ~ 23 0
98 CD-30 19837 PM* 00 05 54.7065197400 -30 04 38.762556780   11.16 10.73     ~ 8 0
99 Cl* Blanco 1 ZS 170 Ro* 00 05 54.7257278496 -30 06 25.770655332   12.88 12.16     ~ 34 0
100 CD-29 18961 Ro* 00 05 56.4050185992 -28 56 10.631326020   11.93 11.38     ~ 25 0
101 CD-30 19838 Ro* 00 05 59.0483763024 -29 39 04.738712940 12.302 12.04 11.67     ~ 38 0
102 SV* HV 6422 EB* 00 06 03.9808672488 -29 37 41.933378784   14.029 12.992 12.665   ~ 14 0
103 CD-29 18965 * 00 06 12.3621354960 -28 28 34.065110244   10.52 10.06     ~ 3 0
104 Cl Blanco 1 40 Ro* 00 06 16.3527714840 -30 05 57.102666936   12.23 11.73     ~ 48 0
105 CD-30 19839 SB* 00 06 17.2031345040 -29 42 22.730543532   12.966 12.23     ~ 10 0
106 Cl* Blanco 1 MPJ 340 Ro* 00 06 17.7833051496 -29 18 40.516500852   12.70 12.05     ~ 24 0
107 Cl* Blanco 1 ZS 181 Er* 00 06 19.0771286160 -30 22 22.398977712   13.98 13.13     ~ 18 0
108 Cl* Blanco 1 ZS 180 * 00 06 20.3278137768 -30 30 47.636687556   12.39 11.77     ~ 10 0
109 CD-30 2 SB* 00 06 28.6540965888 -30 17 48.972597432   12.232 11.62     ~ 10 0
110 Cl* Blanco 1 ZS 187 * 00 06 30.2238016656 -29 53 18.080189592   14.86 14.05     ~ 11 0
111 Cl Blanco 1 38 PM* 00 06 39.3375590928 -30 40 04.491838992   11.78 10.98     ~ 10 0
112 Cl Blanco 1 44 * 00 06 41.5893608304 -30 21 19.565261100   13.41 12.56     ~ 10 0
113 CD-31 3 * 00 06 52.0350296760 -30 23 08.065255128   12.35 11.95     ~ 12 0
114 CD-31 4 * 00 06 52.7984744976 -30 19 46.087076496   11.25 10.68     ~ 9 0
115 Cl* Blanco 1 MPJ 358 Ro* 00 06 53.6859536496 -28 31 08.759868816   13.19 12.43     ~ 21 0
116 Cl* Blanco 1 ZS 196 PM* 00 06 55.2053676984 -30 31 18.509376000   12.25 11.45     ~ 7 0
117 CD-31 7 Ro* 00 07 02.1989172504 -30 21 17.894091744   11.8 11.47     ~ 27 0
118 Cl* Blanco 1 ZS 203 PM* 00 07 13.6957311792 -29 48 25.086828456   14.34 13.59     ~ 6 0
119 Cl* Blanco 1 ZS 213 * 00 07 28.6272578496 -30 13 32.717610156   13.22 12.45     ~ 7 0
120 Cl* Blanco 1 MPJ 360 * 00 07 33.7090996680 -31 23 51.483143112   13.85 13.00     ~ 3 0
121 CD-30 6 * 00 07 34.1907787512 -30 17 14.095352796   11.03 10.49     ~ 34 0
122 Cl* Blanco 1 ZS 214 SB* 00 07 38.2221864360 -29 50 29.686939224   12.00 11.21     ~ 8 0
123 CD-29 9 * 00 07 42.3595714776 -28 55 32.473743852   11.67 11.03     ~ 3 0
124 Cl* Blanco 1 ZS 218 Ro* 00 07 49.7007400440 -30 29 23.241212196   13.15 12.41     ~ 23 0
125 CD-29 12 * 00 08 02.3088328176 -28 49 40.750337316   11.72 11.12     ~ 3 0
126 Cl* Blanco 1 ZS 223 PM* 00 08 05.0702922288 -30 09 36.608876496   12.918 12.184     ~ 9 0
127 Cl* Blanco 1 ZS 222 * 00 08 08.0255118480 -30 16 56.195699916   13.87 13.00   11.964 K4.1 6 0
128 Cl* Blanco 1 ZS 227 * 00 08 10.4531914392 -29 50 20.577885396   14.3 13.50     ~ 7 0
129 Cl* Blanco 1 ZS 228 * 00 08 20.8561656864 -30 12 32.083682184   14.11 13.35     ~ 7 0
130 Cl* Blanco 1 ZS 231 * 00 08 32.5149267240 -30 03 06.687809208   12.37 11.62     ~ 9 0
131 Cl* Blanco 1 ZS 234 * 00 08 42.9464968392 -29 50 39.645908196   13.95 13.11     ~ 7 0
132 HD 455 PM* 00 09 00.6325186536 -29 55 55.648917588   10.510 10.049     F5V 16 0
133 Cl* Blanco 1 ZS 239 * 00 09 05.5826181648 -30 14 09.324158280   13.39 12.48     ~ 10 0
134 Cl* Blanco 1 ZS 243 SB* 00 09 07.9971747600 -29 48 28.193307768   13.84 13.03     ~ 25 0
135 CD-31 26 * 00 09 29.1861090408 -30 42 45.290306340   11.229 10.736     ~ 10 0
136 Cl* Blanco 1 ZS 251 SB* 00 09 35.3014152576 -30 07 25.401523800   11.735 11.128     ~ 9 0
137 CD-29 25 PM* 00 09 46.9797852840 -29 13 43.278017304   10.44 9.98     ~ 8 0
138 BSD 140-332 * 00 09 55.6843783392 -30 00 58.279471524   11.959 11.390     ~ 9 0
139 Cl* Blanco 1 MPJ 355 * 00 10 27.9179216136 -31 21 56.121905304   12.848 12.144     ~ 7 0
140 Cl* Blanco 1 MPJ 356 * 00 10 42.3142637616 -29 26 11.660006220   13.25 12.50     ~ 3 0
141 Cl* Blanco 1 MPJ 350 * 00 13 08.2580213184 -30 15 32.125951116   12.57 11.56     ~ 3 0
142 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
143 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
144 Cl* Blanco 1 MPJ 361 * 23 56 16.3418429040 -29 47 34.723528008   13.62 12.97     ~ 3 0
145 Cl* Blanco 1 MPJ 330 * 23 56 53.0260692768 -29 51 39.081900780   12.21 11.59     ~ 20 0
146 Cl* Blanco 1 MPJ 346 Ro* 23 57 52.2684235224 -30 05 17.983312764   13.17 12.27     ~ 25 0
147 Cl* Blanco 1 MPJ 349 Ro* 23 57 57.0128161104 -29 21 40.097546244   13.79 12.73     ~ 16 0
148 Cl* Blanco 1 MPJ 331 Ro* 23 58 28.3971347736 -29 49 08.357492640   12.79 12.10     ~ 20 0
149 CD-30 19763 * 23 59 02.3228333520 -30 13 17.194572192   11.34 10.78     ~ 6 0
150 TYC 7516-774-1 * 23 59 03.9814774632 -30 09 53.419021488   12.63 12.15     ~ 3 0
151 Cl* Blanco 1 MPJ 347 Ro* 23 59 18.3253959840 -30 10 16.573851480   13.40 12.62     ~ 23 0
152 CD-29 18909 * 23 59 26.7340934832 -28 51 13.914448092   10.56 10.11     F6III 18 0
153 CD-31 19542 PM* 23 59 44.5584946200 -30 44 50.363983572   11.35 10.77     G 6 0

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