1999A&A...344...83M

Query : 1999A&A...344...83M

1999A&A...344...83M - Astronomy and Astrophysics, volume 34483-96 (1999/4-1)

X-ray observations of the young open cluster Blanco 1.

MICELA G., SCIORTINO S., FAVATA F., PALLAVICINI R. and PYE J.

Abstract (from CDS):

We present results from two deep ROSAT HRI exposures on the Blanco 1 open cluster. Blanco 1 is one of the few open clusters at large distance from the Galactic Plane. This circumstance has suggested that it may have formed through a mechanism different from that responsible for the other nearby clusters. The age of Blanco 1 is rather uncertain since, depending on the adopted age indicator, it ranges between 30 and 90Myr. Many cluster members show chromospheric emission typical of young stars. The X-ray observations presented here reveal a high number of X-ray sources, consistent with the young age of the cluster. The typical X-ray luminosity of the cluster members is consistent with that of the Pleiades and significantly lower than the α Per members. These results suggest than the age of Blanco 1 is more similar to the age of the Pleiades than to that of α Per. The time sampling of the X-ray observations allows us to study the variability of the sources on time scales from hours to 6 months - 1 year.

Abstract Copyright: ∼

Journal keyword(s): X-rays: stars - stars: coronae - Galaxy: open clusters and associations: individual: Blanco 1

Nomenclature: Table 4: BlX NN (Nos 1-88).

CDS comments: Table 2: objects 'NNN' = Cl* Blanco 1 ZS NNN, object W71 = Cl* Blanco 1 WGL 71.

Simbad objects: 176

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Number of rows : 176
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 2MASS J00012765-2955130 QSO 00 01 27.6633110376 -29 55 13.672483284   19.2 18.57     ~ 5 0
2 Cl* Blanco 1 ZS 30 * 00 01 39.3160368312 -29 52 26.432080428   13.177 12.445     ~ 8 0
3 Cl* Blanco 1 ZS 35 Er* 00 01 39.8518368840 -30 04 38.474443632   15.56 14.73   13.315 K5.3 32 0
4 BlX 2 X 00 01 43.7 -29 54 41           ~ 1 0
5 Cl* Blanco 1 ZS 36 * 00 01 46.4172762528 -29 51 47.855647404   16.92 16.14     ~ 4 0
6 Cl* Blanco 1 ZS 58 Er* 00 01 46.4700616512 -29 46 38.759396088   12.83 12.21     ~ 41 0
7 BlX 3 X 00 01 48.8378312184 -30 04 19.469957160     20.09     ~ 3 0
8 Cl* Blanco 1 ZS 37 Ro* 00 01 53.4283161552 -30 06 12.837511152   16.58 15.67     ~ 31 0
9 Cl* Blanco 1 ZS 38 Er* 00 01 54.4512166536 -30 07 41.818077048   14.63 13.77     ~ 20 0
10 BlX 4 X 00 01 56.8 -30 07 35           ~ 2 0
11 Cl* Blanco 1 ZS 40 Ro* 00 01 56.9246466432 -30 12 07.973331660   16.28 15.39     ~ 30 0
12 HD 224948 * 00 01 57.7519690656 -30 09 28.673906148   10.29 9.96     A9/F0V 50 0
13 BlX 5 X 00 01 59.4 -29 50 12           ~ 1 0
14 BlX 8 X 00 02 00.2 -29 51 17           ~ 1 0
15 BlX 6 X 00 02 00.6481355016 -29 58 33.633286464     19.27     ~ 2 0
16 2MASS J00020079-2959173 * 00 02 00.8043472680 -29 59 17.435155200     12.73     ~ 13 0
17 2MASS J00020131-2957554 * 00 02 01.3259698608 -29 57 55.403851284     17.81     ~ 18 0
18 2MASS J00020208-2952406 * 00 02 02.0938195872 -29 52 40.673539560     17.32     ~ 10 0
19 Cl* Blanco 1 ZS 43 * 00 02 03.6963240024 -30 10 24.978804132   16.21 15.18     ~ 27 0
20 Cl* Blanco 1 ZS 42 * 00 02 04.2170515536 -30 10 34.383723960   15.31 14.51     ~ 31 0
21 BlX 11 X 00 02 05.0 -30 10 17           ~ 1 0
22 2MASS J00020766-3004426 * 00 02 07.6726930848 -30 04 42.628245528     16.89     ~ 18 0
23 BlX 13 X 00 02 11.9 -30 07 04           ~ 2 0
24 HD 224976 * 00 02 11.9253149232 -30 15 02.916293472   10.36 10.00     F3V 17 0
25 BlX 14 X 00 02 12.2 -30 02 32           ~ 2 0
26 Cl* Blanco 1 ZS 44 Er* 00 02 14.6933278272 -29 49 04.088797212   14.05 12.94     ~ 30 0
27 Cl* Blanco 1 ZS 45 Ro* 00 02 18.5541763032 -29 51 08.453919708   13.6 12.87     ~ 34 0
28 Cl* Blanco 1 ZS 46 ** 00 02 19.725960 -29 56 07.45116   15.60 14.30 14.00   M0-1V 10 0
29 CD-30 19788 PM* 00 02 19.7588414304 -29 45 56.156898888   12.54 11.75     ~ 9 0
30 CD-30 19789 * 00 02 20.7817739160 -29 47 50.406817092   11.26 10.59     ~ 8 0
31 CD-30 19787 Ro* 00 02 21.6371141520 -30 08 21.621740856   11.11 10.62     ~ 43 0
32 2MASS J00022289-3002532 * 00 02 22.8795667286 -30 02 53.627099571     16.32     M3-4V 11 0
33 BlX 16 * 00 02 23.6302207584 -29 50 39.794335584     15.69     ~ 4 0
34 Cl* Blanco 1 ZS 53 Ro* 00 02 24.2721205896 -30 09 08.947903644   16.82 16.08     ~ 30 0
35 2MASS J00022589-2952392 Ro* 00 02 25.8935942808 -29 52 39.227350188     16.44     M3-4V 23 0
36 CD-30 19791 * 00 02 27.2345966400 -29 46 53.612929632   11.76 11.30     ~ 9 0
37 Cl* Blanco 1 ZS 54 Ro* 00 02 28.1916119256 -30 04 43.459142016   13.91 13.04     K4-5V 27 0
38 Cl* Blanco 1 ZS 52 * 00 02 30.9135392232 -30 17 01.992506604   16.96 16.01     ~ 19 0
39 BlX 18 X 00 02 32.0 -30 06 38           ~ 2 0
40 Cl* Blanco 1 ZS 61 * 00 02 34.8274502088 -30 05 25.543689936   14.44 13.80     K5-7V 19 0
41 BlX 19 X 00 02 35.1 -29 55 57           ~ 2 0
42 Cl* Blanco 1 ZS 62 SB* 00 02 35.4578432760 -30 07 01.940181744   13.26 12.52     M4-5V 24 0
43 BlX 20 X 00 02 35.9 -29 52 42           ~ 1 0
44 BlX 21 X 00 02 39.0 -29 57 43           ~ 2 0
45 2MASS J00023937-3008040 * 00 02 39.3743406192 -30 08 03.919765956     18.78     ~ 25 0
46 Cl* Blanco 1 ZS 60 * 00 02 41.7797262168 -29 58 53.204316420   16.56 15.60     M0-1V 12 0
47 Cl* Blanco 1 ZS 68 * 00 02 44.6697356256 -30 13 08.375391480   16.06 15.17     ~ 9 0
48 2MASS J00024579-2955024 * 00 02 45.8104087632 -29 55 02.534529972     19.33     ~ 9 0
49 BlX 25 X 00 02 48.2 -29 55 18           ~ 1 0
50 Cl* Blanco 1 ZS 70 Ro* 00 02 48.2261979312 -29 46 34.842205956   14.44 13.63     ~ 35 0
51 2MASS J00024841-2953539 EB* 00 02 48.4315088952 -29 53 53.947671288     17.46     ~ 16 0
52 2MASS J00025151-2954493 Ro* 00 02 51.5268817992 -29 54 49.428557208     16.78     ~ 28 0
53 2MASS J00025418-3006559 Ro* 00 02 54.1914450096 -30 06 55.997068392     17.04     ~ 24 0
54 BlX 28 X 00 02 54.7 -30 09 28           ~ 1 0
55 BlX 29 X 00 02 55.1 -29 55 13           ~ 1 0
56 HD 225047 * 00 02 55.2273984408 -30 08 59.183837916   8.45 8.42     A0V 58 0
57 Cl* Blanco 1 ZS 76 SB* 00 02 56.3891922408 -30 04 44.872672188   12.98 12.32     ~ 35 0
58 Cl* Blanco 1 ZS 72 * 00 02 57.4314009000 -29 48 30.336117912   14.25 13.55     ~ 7 0
59 BlX 30 X 00 02 58.0 -30 11 13           ~ 2 0
60 Cl* Blanco 1 ZS 73 PM* 00 02 59.6485550040 -29 52 52.354655508   16.76 15.85     M1-3V 6 0
61 BlX 33 X 00 02 59.8 -29 55 37           ~ 1 0
62 BlX 32 X 00 02 59.8 -29 52 37           ~ 2 0
63 Cl* Blanco 1 ZS 75 * 00 03 00.2764601520 -30 03 21.624708168   13.73 12.89     K4-7V 19 0
64 2MASS J00030055-3015439 Ro* 00 03 00.5540417568 -30 15 44.086277340     15.73     ~ 27 0
65 2MASS J00030066-2949420 * 00 03 00.6666026880 -29 49 42.164709276     18.09     ~ 25 0
66 [PMS2004] Un 39 X 00 03 01.8 -29 55 48           ~ 2 0
67 BlX 36 X 00 03 02.6 -29 54 24           ~ 2 0
68 Cl* Blanco 1 ZS 71 Er* 00 03 02.9500128168 -29 47 44.092142016   15.83 14.85     ~ 13 0
69 Cl Blanco 1 OpC 00 03 04.1 -29 48 55           ~ 380 0
70 Cl* Blanco 1 ZS 74 * 00 03 04.1770449048 -30 00 08.823637116   16.46 15.71     ~ 8 0
71 Cl* Blanco 1 ZS 88 * 00 03 06.6435455256 -29 43 11.504693856   14.97 13.84     ~ 10 0
72 Cl* Blanco 1 ZS 83 Er* 00 03 07.0924342920 -30 15 17.176938192   13.42 12.55     ~ 15 0
73 CD-30 19797 Ro* 00 03 10.8157210080 -30 10 48.969614568   11.87 11.09     ~ 44 0
74 2MASS J00031154-2958103 * 00 03 11.5488876960 -29 58 10.390667556     18.51     M4-5V 28 0
75 1RXS J000313.7-300558 X 00 03 14.4 -30 06 12           ~ 2 0
76 Cl* Blanco 1 ZS 95 * 00 03 16.4934713400 -29 58 47.436654252   13.26 12.40     ~ 23 0
77 [PMS2004] Opt 101 X 00 03 18.1939068672 -29 58 46.152267636     18.13     ~ 3 0
78 Cl* Blanco 1 ZS 89 * 00 03 18.7777520856 -29 44 43.121464764   15.45 14.63     ~ 8 0
79 BlX 40 X 00 03 18.9 -30 02 17           ~ 2 0
80 CD-30 19800 Er* 00 03 20.6140352856 -29 49 22.753595676   11.75 11.23     F8 46 0
81 2MASS J00032088-3004472 * 00 03 20.9096702304 -30 04 47.251256772     18.16     M4-5V 10 0
82 CD-30 19801 SB* 00 03 21.8528903616 -30 01 10.528822956   10.75 10.36     F3V 28 0
83 2MASS J00032273-2953505 * 00 03 22.7608865832 -29 53 50.662865616     16.62     M3-4V 11 0
84 Cl* Blanco 1 ZS 94 Ro* 00 03 24.1865402592 -29 56 22.965110448   15.85 14.95     K7-M0V 34 0
85 CD-30 19802 * 00 03 24.3910794816 -29 48 49.446597744   11.07 10.56     F8V 44 0
86 Cl* Blanco 1 ZS 93 Ro* 00 03 24.6749677800 -29 55 14.733336360   14.9 14.18     K5-7V 38 0
87 Cl* Blanco 1 ZS 92 PM* 00 03 24.8811951120 -29 53 15.378978444   16.25 15.34     K7-M0V 6 0
88 BlX 43 X 00 03 24.9 -30 12 27           ~ 1 0
89 BlX 44 X 00 03 29.3 -29 53 42           ~ 1 0
90 2MASS J00032991-3001203 * 00 03 29.9139307632 -30 01 20.468386920     18.02     ~ 25 0
91 HD 225111 SB* 00 03 31.8883550808 -29 43 04.772702388   10.512 10.133     A5/7(III) 45 0
92 2MASS J00033454-2958306 * 00 03 34.5451804152 -29 58 30.731276532     17.84     ~ 27 0
93 BlX 47 X 00 03 35.1 -30 08 06           ~ 2 0
94 Cl Blanco 1 32 * 00 03 39.7958222592 -30 02 09.517097112   11.921 11.421     ~ 14 0
95 BlX 48 X 00 03 49.5 -30 08 22           ~ 1 0
96 Cl Blanco 1 31 SB* 00 03 50.1716211552 -30 03 55.699032204   11.560 11.054     ~ 42 0
97 BlX 49 X 00 03 57.2 -30 03 26           ~ 1 0
98 Cl* Blanco 1 ZS 112 Ro* 00 04 04.0229574912 -29 58 26.484825828   13.92 13.06     ~ 30 0
99 Cl* Blanco 1 ZS 111 * 00 04 07.5378517872 -30 06 35.198908992   13.44 12.27     ~ 9 0
100 Cl* Blanco 1 ZS 113 * 00 04 07.7367732696 -29 53 00.562903476   13.78 13.00     ~ 11 0
101 HD 225187 * 00 04 11.9007705216 -30 08 05.679965328   6.986 7.074     B8V 50 0
102 Cl* Blanco 1 ZS 115 Ro* 00 04 12.5764157856 -29 58 02.528541084   17.2 14.18     ~ 16 0
103 2MASS J00042585-3004026 * 00 04 25.8619656192 -30 04 02.640203904     16.86     ~ 6 0
104 BlX 51 X 00 04 26.8 -30 06 21           ~ 1 0
105 BlX 52 X 00 04 27.3 -30 03 21           ~ 1 0
106 2MASS J00042785-3006347 * 00 04 27.8863218744 -30 06 34.536274308     16.54     ~ 2 0
107 Cl* Blanco 1 ZS 129 Ro* 00 04 31.6649755080 -30 14 41.691809328   12.40 11.82     ~ 32 0
108 BlX 54 X 00 04 33.4 -30 02 52           ~ 1 0
109 Cl* Blanco 1 ZS 128 PM* 00 04 38.4277965528 -30 00 57.898989432   17.09 16.47     ~ 4 0
110 Cl* Blanco 1 ZS 133 * 00 04 49.02 -30 01 19.7   15.63 14.30     ~ 4 0
111 CD-30 19817 * 00 04 49.2039609888 -30 00 52.898627700   11.63 11.11     ~ 13 0
112 BlX 55 X 00 04 51.6 -29 55 32           ~ 1 0
113 2MASS J00045256-3011282 Ro* 00 04 52.5643212264 -30 11 28.212802008     16.39     ~ 26 0
114 HD 225282 * 00 04 53.3313519624 -30 15 23.784834240   8.34 8.29     A0IV/V 56 0
115 2MASS J00045606-3006530 Ro* 00 04 56.0739291504 -30 06 53.020676772     16.61     ~ 26 0
116 Cl Blanco 1 28 Ro* 00 04 58.8405701856 -30 09 41.640563700   11.76 11.22     ~ 40 0
117 BlX 58 X 00 04 59.7890777928 -29 50 20.441281560     18.70     ~ 2 0
118 2MASS J00050262-3007333 * 00 05 02.6188663176 -30 07 33.415430196     17.01     ~ 7 0
119 Cl* Blanco 1 ZS 142 PM* 00 05 04.9271049024 -30 19 39.222180372   16.54 15.55     ~ 7 0
120 BlX 60 X 00 05 06.3 -30 02 47           ~ 1 0
121 BlX 62 * 00 05 06.9966180888 -30 04 29.356912776     14.49     ~ 3 0
122 Cl* Blanco 1 ZS 144 * 00 05 07.0771510704 -29 59 25.719726300   16.06 15.16     ~ 13 0
123 2MASS J00050744-3001247 * 00 05 07.4635099848 -30 01 24.729400092     19.03     ~ 6 0
124 BlX 63 X 00 05 07.9 -30 10 50           ~ 1 0
125 2MASS J00050844-3004072 * 00 05 08.4399070704 -30 04 07.310192304     17.84     ~ 17 0
126 BlX 65 X 00 05 10.0 -30 06 57           ~ 1 0
127 2MASS J00051095-3003411 Ro* 00 05 10.9502127432 -30 03 41.202748512     17.42     ~ 26 0
128 6dFGS gJ000511.6-300634 G 00 05 11.6421861240 -30 06 34.203661776   19.63 18.69 18.58   ~ 5 0
129 BlX 68 X 00 05 13.3 -30 10 10           ~ 1 0
130 G 267-27 PM* 00 05 13.3248769656 -29 55 28.989027192   16.3 15.07     ~ 9 0
131 Cl* Blanco 1 ZS 148 SB* 00 05 14.3993177952 -29 54 23.769659736   13.2 12.18     ~ 26 0
132 BlX 69 X 00 05 17.3 -30 08 10           ~ 1 0
133 Cl* Blanco 1 ZS 147 Ro* 00 05 17.5553862720 -29 46 57.334864512   14.17 13.44     ~ 35 0
134 Cl* Blanco 1 ZS 151 * 00 05 20.1505776456 -30 25 22.022008068   13.9 13.11     ~ 13 0
135 BlX 70 X 00 05 22.3 -30 03 07           ~ 1 0
136 Cl* Blanco 1 ZS 153 PM* 00 05 23.5507684512 -30 23 31.952938632   13.11 12.43     ~ 11 0
137 Cl* Blanco 1 ZS 155 * 00 05 23.8505846568 -30 19 54.734051172   16.45 15.79     ~ 9 0
138 Cl* Blanco 1 ZS 156 Ro* 00 05 25.5196394016 -30 18 35.530349004   16.7 15.82     ~ 27 0
139 HD 50 SB* 00 05 26.7564621576 -30 17 24.468604872   9.99 9.68     A9V 43 0
140 Cl* Blanco 1 ZS 161 SB* 00 05 26.8610473200 -29 51 20.539094328   13.38 12.68     ~ 25 0
141 BlX 71 X 00 05 27.1280657784 -30 01 24.343181760     18.33     ~ 2 0
142 Cl* Blanco 1 ZS 158 Ro* 00 05 29.0190326629 -30 08 32.038849083   14.414 13.439 13.172   ~ 25 0
143 CD-30 19828 SB* 00 05 29.2644205464 -30 06 54.431604252   12.04 11.25     ~ 11 0
144 CD-30 19829 Ro* 00 05 30.9374971848 -29 53 08.163500496   11.77 11.24 11.18   ~ 35 0
145 Cl* Blanco 1 ZS 154 * 00 05 31.5714811848 -30 20 51.658342440   14.31 13.54     ~ 16 0
146 BlX 72 X 00 05 34.3 -29 58 32           ~ 1 0
147 CD-30 19830 * 00 05 35.0762004384 -30 02 10.046018364   12.27 11.66     ~ 9 0
148 Cl* Blanco 1 ZS 165 SB* 00 05 35.5434453312 -29 57 06.583448412   13.37 12.51 12.42   ~ 23 0
149 BlX 73 X 00 05 35.8 -29 56 32           ~ 1 0
150 HD 91 * 00 05 42.9570193392 -29 57 38.258320932   10.24 9.99     A9/F0V 58 0
151 2MASS J00054450-2959144 * 00 05 44.5076684856 -29 59 14.422187040     17.76     ~ 24 0
152 BlX 75 X 00 05 47.8 -30 15 40           ~ 1 0
153 BlX 76 X 00 05 48.1 -29 56 38           ~ 1 0
154 BlX 77 X 00 05 50.3 -30 14 37           ~ 1 0
155 BlX 78 X 00 05 50.4 -30 04 00           ~ 1 0
156 CD-30 19837 PM* 00 05 54.7065197400 -30 04 38.762556780   11.16 10.73     ~ 8 0
157 Cl* Blanco 1 ZS 170 Ro* 00 05 54.7257278496 -30 06 25.770655332   12.88 12.16     ~ 34 0
158 2MASS J00055813-3011090 * 00 05 58.1379156480 -30 11 08.990811420     16.73     ~ 27 0
159 BlX 80 X 00 06 01.1319 -29 55 50.147     18.48     ~ 2 0
160 2MASS J00060409-2957021 * 00 06 04.0890900000 -29 57 02.230957440     17.65     ~ 6 0
161 Cl* Blanco 1 ZS 172 Ro* 00 06 04.2963075768 -30 02 11.861791620   16.77 15.98     ~ 30 0
162 BlX 82 X 00 06 04.8 -29 55 40           ~ 1 0
163 [VV2006] J000611.4-300758 QSO 00 06 11.4568530624 -30 07 58.647305928     19.96     ~ 7 0
164 Cl Blanco 1 40 Ro* 00 06 16.3527714840 -30 05 57.102666936   12.23 11.73     ~ 48 0
165 2MASS J00061777-3006296 * 00 06 17.7745617072 -30 06 29.664769788     17.86     ~ 25 0
166 BlX 85 X 00 06 19.0 -30 08 20           ~ 1 0
167 Cl* Blanco 1 ZS 184 PM* 00 06 23.7078755688 -29 52 04.746092376   16.21 15.67     ~ 8 0
168 CD-30 2 SB* 00 06 28.6540965888 -30 17 48.972597432   12.232 11.62     ~ 10 0
169 Cl* Blanco 1 ZS 187 * 00 06 30.2238016656 -29 53 18.080189592   14.86 14.05     ~ 11 0
170 BlX 86 X 00 06 31.0 -30 12 47           ~ 1 0
171 BlX 87 X 00 06 31.6377 -30 11 15.371     18.27     ~ 2 0
172 2MASS J00063403-3008460 Ro* 00 06 34.0361630544 -30 08 46.053359520     17.20     ~ 26 0
173 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
174 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
175 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
176 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0

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