2003A&A...402..571H


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.26CET03:04:12

2003A&A...402..571H - Astronomy and Astrophysics, volume 402, 571-586 (2003/5-1)

An X-ray study of the open clusters NGC 2451 A and B.

HUENSCH M., WEIDNER C. and SCHMITT J.H.M.M.

Abstract (from CDS):

We have conducted a detailed study of the object NGC 2451, which actually consists of two different open clusters A and B along the same line of sight at 206pc and 370pc distance, respectively. Although belonging to the nearest clusters, they have not been much investigated until present due to strong contamination by field stars. ROSAT X-ray observations and optical UBVR photometry are used to identify cluster members by means of X-ray emission and colour-magnitude diagrams. The identified stars concentrate nicely around the expected main sequences in the colour-magnitude diagram at the distances derived from astrometric investigations. Altogether, 39 stars are identified as member candidates of the nearer cluster A, 49 stars as member candidates of the more distant cluster B, and 22 faint stars are probably members of either of the two clusters, but due to large errors it is not clear to which one they belong. Further 40 stars identified with X-ray sources are probably non-members. For the first time, the range of known probable cluster members of NGC 2451 A and B has been extended downwards the main sequence to stars of spectral class M. Isochrone fitting yields an age of 50 to 80Myrs for NGC 2451 A and ≃50Myrs for NGC 2451 B, consistent with the X-ray luminosity distribution functions, which are comparable to other clusters in the same age range. Except from the occurence of four flares, the stars of both clusters do not show strong long-term X-ray variability exceeding a factor 5 over a time span of 1 to 3 years.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: coronae - Hertzsprung-Russell (HR) and C-M diagrams - open clusters and associations: individual: NGC 2451 - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/402/571): x-obs.dat sources.dat notes.dat tables.tex>

Nomenclature: Tables 3-10: [HWS2003] XNNN (Nos X1-X188).

Simbad objects: 154

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Number of rows : 154

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 [HWS2003] X4 X 07 42 10 -37 26.8   19.71 18.23     ~ 1 0
2 CD-37 3808 * 07 42 43.5635115088 -38 02 57.855618182   10.58 10.30     ~ 12 0
3 CD-37 3810 SB* 07 42 52.6277663660 -38 03 26.935652881   11.40 10.84     ~ 8 0
4 [HWS2003] X92 X 07 42 55 -37 57.9   19.09 17.98     ~ 1 0
5 Cl* NGC 2451 PKB 2609 * 07 43 00.5826321872 -37 57 30.074433333 13.070 12.958 12.332 11.940 11.542 ~ 5 0
6 GES J07430635-3809211 * 07 43 06.3503048859 -38 09 21.022258900 17.636 16.611 15.152 14.158 13.017 ~ 6 0
7 [HWS2003] X153 X 07 43 09 -38 10.8   15.93 15.00     ~ 1 0
8 NGC 2451A OpC 07 43 12 -38 24.0           ~ 87 0
9 [HWS2003] X13 X 07 43 12 -37 37.6   16.98 15.31     ~ 1 0
10 [HWS2003] X35 X 07 43 13 -37 47.4   17.08 15.70     ~ 1 0
11 Cl* NGC 2451 PKB 2262 * 07 43 19.5574841142 -38 05 37.162782269 14.138 13.923 13.163 12.720 12.272 ~ 5 0
12 GES J07432440-3756131 * 07 43 24.3932691980 -37 56 13.164617151   14.240 13.407 12.918 12.464 ~ 5 0
13 HD 62660 * 07 43 30.7003510318 -38 08 15.236037835   9.36 8.37     G8III/IV 16 0
14 HD 62712 * 07 43 42.9165663591 -38 12 06.759652528 5.76 6.24 6.40     B8IV 76 0
15 [HWS2003] X124 X 07 43 45 -38 03.9   21.94 20.25     ~ 1 0
16 CD-37 3823 * 07 43 49.3342 -37 53 44.607   11.049 10.627 10.198 9.890 ~ 13 0
17 CD-37 3825 * 07 43 49.7033199730 -37 58 00.755271544   10.025 9.855 9.736 9.682 A2V 12 0
18 GES J07435088-3807070 * 07 43 50.885 -38 07 06.97   17.641 16.123 14.972 13.504 ~ 3 0
19 [HWS2003] X173 X 07 43 52 -38 16.3   16.39 14.89     ~ 1 0
20 Cl* NGC 2451 PKB 2275 * 07 43 54.3422532268 -38 00 02.733699580 13.632 13.150 12.309   11.373 ~ 11 0
21 GES J07435482-3746307 * 07 43 54.8191375898 -37 46 30.652619048 18.779 17.984 16.505 15.407 14.095 ~ 5 0
22 Cl* NGC 2451 PKB 6499 * 07 43 57.4905817991 -38 27 51.020604351   14.697 13.537     ~ 8 0
23 CPD-37 1516 * 07 43 58.3065401664 -37 37 24.748621126   12.443 11.826     ~ 3 0
24 HD 62782 * 07 44 02.7453905342 -38 08 32.975410092   9.59 8.63     G8III/IV 13 0
25 [HWS2003] X123 X 07 44 04 -38 03.8   17.98 16.81     ~ 1 0
26 UCAC4 261-020052 ** 07 44 06.864144 -37 59 22.13520   17.940 16.430 16.17   ~ 3 0
27 HD 62802 * 07 44 08.6015355961 -37 59 00.650266089 9.346 9.466 9.359 9.386 9.291 B9V 16 0
28 Cl* NGC 2451 AR 43 * 07 44 09.9170635138 -37 54 52.755009877   14.189 13.396 12.930 12.471 ~ 6 0
29 CD-37 3832 * 07 44 12.9764918306 -37 20 50.517649628   10.96 10.25     ~ 3 0
30 [HWS2003] X30 X 07 44 16 -37 46.0   14.21 13.15     ~ 2 0
31 [HWS2003] X34 X 07 44 17 -37 47.2   19.92 18.42     ~ 1 0
32 [HWS2003] X71 X 07 44 18 -37 54.3   20.20 18.62     ~ 1 0
33 [HWS2003] X52 X 07 44 18 -37 51.6   19.39 18.50     ~ 1 0
34 [HWS2003] X98 X 07 44 19 -37 58.9   16.56 15.53     ~ 1 0
35 GES J07441914-3800195 * 07 44 19.1415381798 -38 00 19.433915419   15.480 14.370     ~ 4 0
36 [HWS2003] X135 X 07 44 21 -38 06.0   13.97 12.60     ~ 1 0
37 Cl* NGC 2451 AR 52 * 07 44 22.5471327240 -37 52 55.541278893   13.915 13.148 12.725 12.293 ~ 6 0
38 [HWS2003] X26 X 07 44 23 -37 44.5   14.94 14.09     ~ 1 0
39 Cl* NGC 2451 PKB 1256 * 07 44 24.0637823031 -38 35 59.038317704   11.562 10.953     ~ 9 0
40 Cl* NGC 2451 PKB 2288 * 07 44 24.4316766484 -38 09 03.314895259   14.166 13.473     ~ 2 0
41 [HWS2003] X86 * 07 44 26.0607896338 -37 56 59.276283468   19.86 18.34     ~ 3 0
42 NGC 2451B OpC 07 44 27 -37 40.0           ~ 66 0
43 HD 62875 * 07 44 27.5558087812 -37 39 48.038411436   8.27 8.31     B8V 25 0
44 HD 62876 * 07 44 28.1014367952 -37 59 15.808750773   8.698 8.576     A2V 26 0
45 Cl* NGC 2451 AR 57 * 07 44 29.2665909086 -37 46 44.287689686 13.539 13.459 12.780 12.387 11.989 ~ 7 0
46 NGC 2451 124 * 07 44 32.6905759757 -38 00 26.710282978   12.50 11.88     ~ 4 0
47 HD 62893 * 07 44 34.1829802676 -37 56 34.509999215   5.759 5.870     B8V 57 0
48 [HWS2003] X36 X 07 44 35 -37 47.5   19.33 17.62     ~ 1 0
49 [HWS2003] X121 X 07 44 36 -38 03.0   19.64 18.05     ~ 1 0
50 GES J07443639-3754018 * 07 44 36.3856228269 -37 54 01.853092754   14.245 13.444 12.994 12.520 ~ 6 0
51 GES J07443683-3754598 * 07 44 36.8239283274 -37 54 59.778027865   18.553 17.112 16.043 14.884 ~ 4 0
52 [HWS2003] X170 X 07 44 37 -38 14.5   20.44 19.25     ~ 1 0
53 [HWS2003] X44 X 07 44 37 -37 49.0   18.17 16.70     ~ 1 0
54 [HWS2003] X140 X 07 44 38 -38 06.2   19.86 18.59     ~ 1 0
55 [HWS2003] X58 X 07 44 38 -37 52.1   18.99 18.13     ~ 1 0
56 CD-37 3843 * 07 44 38.2951995455 -38 13 15.821611501   10.7 10.5     ~ 8 0
57 [HWS2003] X166 X 07 44 42 -38 13.5   19.31 18.24     ~ 1 0
58 [HWS2003] X79 X 07 44 42 -37 55.8   17.92 17.14     ~ 1 0
59 [HWS2003] X41 X 07 44 44 -37 48.1   19.77 18.06     ~ 1 0
60 [HWS2003] X164 X 07 44 46 -38 13.1   18.99 18.05     ~ 1 0
61 NGC 2451 8 * 07 44 47.1490494816 -38 11 55.525097594   14.64 13.95     ~ 2 0
62 CD-37 3848 * 07 44 47.9560468776 -38 14 38.499065203   11.84 11.60     ~ 3 0
63 GES J07444872-3805553 * 07 44 48.7227456058 -38 05 55.348555475   14.240 13.490     ~ 5 0
64 [HWS2003] X54 X 07 44 49 -37 51.6   17.15 16.73     ~ 1 0
65 [HWS2003] X38 X 07 44 49 -37 47.8   20.11 18.43     ~ 1 0
66 CD-37 3850 * 07 44 51.0395396834 -37 40 07.245535365   10.9 10.7     ~ 11 0
67 GES J07445137-3808014 * 07 44 51.3799533526 -38 08 01.412248875   14.704 13.768 13.231 12.751 ~ 5 0
68 CD-37 3853 * 07 44 56.1709902572 -38 00 13.587973028   10.3 9.8     ~ 8 0
69 HD 62974 ** 07 44 59.6841558014 -38 05 39.203016846   8.435 8.302     A3V 26 0
70 CPD-37 1549 * 07 45 00.6043967049 -38 00 01.529623561   12.18 11.68     ~ 5 0
71 CD-37 3859 * 07 45 01.6846200962 -38 02 20.162150507   10.508 10.059 9.817 9.614 ~ 13 0
72 NGC 2451 118 * 07 45 02.2036604081 -38 25 49.144564431   12.79 12.19     ~ 3 0
73 NGC 2451 51 * 07 45 02.4587503196 -38 14 52.965168328   13.06 12.39     ~ 4 0
74 Cl* NGC 2451 AR 95 * 07 45 02.6676867831 -38 01 52.257581351 13.142 13.184 12.495 12.098 11.744 ~ 6 0
75 NGC 2451 128 * 07 45 03.7467239906 -38 06 10.781112938   13.505 12.782 12.392 12.035 ~ 7 0
76 HD 62991 * 07 45 04.7697584345 -37 53 16.328418091 5.76 6.402 6.512     B2V 54 0
77 GES J07450487-3804286 * 07 45 04.8737003321 -38 04 28.669718702 19.862 19.186 17.688 16.439 14.910 ~ 5 0
78 [HWS2003] X83 X 07 45 05 -37 56.6   16.76 15.42     ~ 1 0
79 [HWS2003] X40 X 07 45 05 -37 48.1   16.87 15.49     ~ 2 0
80 [HWS2003] X67 X 07 45 08 -37 53.9   17.16 16.40     ~ 1 0
81 [HWS2003] X158 X 07 45 09 -38 12.2   17.28 15.94     ~ 1 0
82 [HWS2003] X51 X 07 45 09 -37 51.5   15.57 14.84     ~ 1 0
83 [HWS2003] X17 X 07 45 09 -37 41.5   15.26 14.29     ~ 1 0
84 CPD-37 1556 V* 07 45 09.5986569785 -38 00 04.302568627   12.01 11.45     ~ 5 0
85 [HWS2003] X125 X 07 45 10 -38 04.1   15.78 15.08     ~ 1 0
86 [HWS2003] X87 X 07 45 10 -37 57.2   20.64 19.08     ~ 1 0
87 [HWS2003] X20 X 07 45 10 -37 42.1   19.17 18.09     ~ 1 0
88 [HWS2003] X29 X 07 45 12 -37 45.2   14.05 13.30     ~ 1 0
89 [HWS2003] X28 X 07 45 12 -37 44.6   14.22 13.58     ~ 1 0
90 [HWS2003] X37 X 07 45 13 -37 47.5   19.64 17.99     ~ 1 0
91 CD-37 3862 ** 07 45 14.9371174021 -38 11 46.469461791 10.882 10.905 10.424 10.155 9.874 ~ 9 0
92 * c Pup * 07 45 15.2964161 -37 58 06.899807 7.06 5.34 3.61 2.26 1.26 K4III 92 0
93 NGC 2451 126 * 07 45 15.6 -37 54 40   12.82 12.10     ~ 4 0
94 [HWS2003] X89 X 07 45 19 -37 57.4   19.66 18.31     ~ 1 0
95 GES J07452052-3753587 * 07 45 20.5201675138 -37 53 58.757499180   15.011 13.945 13.342 12.809 ~ 4 0
96 CPD-37 1565 * 07 45 20.9517456785 -37 49 52.919723107 12.353 12.406 11.840 11.511 11.169 ~ 10 0
97 [HWS2003] X152 X 07 45 22 -38 09.8   14.19 13.21     ~ 1 0
98 2MASS J07452245-3804103 * 07 45 22.4620779865 -38 04 10.412105721   21.15 19.271 17.979 16.426 ~ 3 0
99 [HWS2003] X185 X 07 45 23 -38 30.6   19.15 17.93     ~ 1 0
100 NGC 2451 Cl* 07 45.4 -37 58           ~ 154 1
101 [HWS2003] X78 X 07 45 24 -37 55.7   17.29 16.29     ~ 1 0
102 CD-37 3869 * 07 45 26.5270473372 -38 11 47.278752528 12.030 11.997 11.438 11.137 10.816 ~ 6 0
103 Cl* NGC 2451 AR 119 * 07 45 26.7902238194 -37 48 29.915127731   13.62 13.05     ~ 2 0
104 [HWS2003] X113 X 07 45 27 -38 00.9   20.52 18.91     ~ 1 0
105 HD 63079 * 07 45 27.3624956832 -37 35 46.625218963   6.857 6.909     B9V 45 0
106 2MASS J07452886-3805532 * 07 45 28.8724486706 -38 05 53.260151239   18.74 18.904 17.558 16.015 ~ 2 0
107 Cl* NGC 2451 AR 122 * 07 45 28.8938510727 -37 51 23.294372083   14.31 13.51     ~ 4 0
108 [HWS2003] X95 X 07 45 32 -37 58.4   20.03 18.96     ~ 1 0
109 GES J07453282-3751231 * 07 45 32.8247758289 -37 51 23.070159957 20.094 19.315 17.737 16.477 14.919 ~ 3 0
110 [HWS2003] X7 X 07 45 34 -37 30.5   13.43 12.73     ~ 1 0
111 GES J07453451-3751529 * 07 45 34.5049714903 -37 51 52.973599135 14.490 14.222 13.383 12.921 12.463 ~ 5 0
112 [HWS2003] X39 X 07 45 35 -37 48.0   13.03 12.45     ~ 1 0
113 2MASS J07453561-3755001 * 07 45 35.6107501718 -37 55 00.197677451   18.50 17.080 15.976 14.829 ~ 2 0
114 [HWS2003] X163 X 07 45 37 -38 13.5   15.15 14.35     ~ 1 0
115 CD-37 3870 * 07 45 38.5491554465 -37 46 41.752568608   12.153 11.513     ~ 11 0
116 [HWS2003] X24 X 07 45 39 -37 44.4   18.24 17.37     ~ 1 0
117 CD-37 3871 * 07 45 42.1918113067 -37 44 38.146219978   11.74 11.23     ~ 5 0
118 Cl* NGC 2451 AR 134 * 07 45 45.8522596577 -37 53 49.980596863   14.167 13.360 12.872 12.314 ~ 7 0
119 [HWS2003] X150 X 07 45 46 -38 09.2   14.43 13.50     ~ 1 0
120 2MASS J07454698-3756220 * 07 45 46.9813026001 -37 56 22.077352003   20.39 18.874 17.368 15.594 ~ 4 0
121 [HWS2003] X187 X 07 45 50 -38 33.9   13.42 12.58     ~ 2 0
122 [HWS2003] X159 X 07 45 53 -38 12.5   12.62 11.94     ~ 1 0
123 [HWS2003] X56 X 07 45 54 -37 51.8   17.90 16.51     ~ 1 0
124 [HWS2003] X127 X 07 45 56 -38 04.1   18.28 16.95     ~ 1 0
125 [HWS2003] X96 X 07 45 59 -37 58.6   14.43 13.54     ~ 1 0
126 CPD-37 1582 * 07 46 01.8651142720 -38 00 27.076321153 12.613 12.723 12.041 11.696 11.384 ~ 6 0
127 [HWS2003] X91 X 07 46 02 -37 57.8   19.01 17.47     ~ 1 0
128 2MASS J07460224-3804461 Y*? 07 46 02.2485156866 -38 04 46.238702990   20.780 18.979 15.439 15.813 ~ 3 0
129 GES J07460836-3753518 * 07 46 08.3627746012 -37 53 51.804170192   17.475 15.952 14.920 13.666 ~ 5 0
130 [HWS2003] X3 X 07 46 09 -37 24.8   11.18 10.66     ~ 2 0
131 HD 63216 * 07 46 10.2177237765 -38 06 05.655310892   8.53 8.61     B9V 20 0
132 HD 63215 Be* 07 46 10.5452221022 -37 56 01.225863875   5.755 5.869     B5V 54 0
133 [HWS2003] X47 X 07 46 11 -37 50.4   14.95 14.18     ~ 1 0
134 CD-37 3885 * 07 46 11.4566596680 -37 31 50.621105024   11.94 11.45     ~ 6 0
135 2MASS J07461185-3812360 * 07 46 11.8531099615 -38 12 36.022668418 14.470 14.198 13.407 12.938 12.508 ~ 3 0
136 CD-38 3636 * 07 46 14.2290447377 -38 27 57.798757005   12.12 11.53     ~ 2 0
137 [HWS2003] X162 X 07 46 20 -38 12.9   21.89 21.46     ~ 1 0
138 Cl* NGC 2451 PKB 2361 * 07 46 24.8482391816 -38 01 10.601998604 14.299 13.646 12.703 10.098 11.770 ~ 10 0
139 [HWS2003] X141 X 07 46 25 -38 06.5   20.23 19.29     ~ 1 0
140 [HWS2003] X108 X 07 46 25 -38 00.1   15.94 14.57     ~ 2 0
141 GES J07462980-3752443 * 07 46 29.8025912729 -37 52 44.336403712   19.176 17.618 16.359 14.725 ~ 5 0
142 CD-37 3897 * 07 46 35.5472653514 -38 06 43.842845825   10.33 10.01     ~ 10 0
143 CPD-37 1605 * 07 46 48.4104521763 -38 08 53.637884285   9.890 9.453 9.191 8.953 ~ 13 0
144 [HWS2003] X22 X 07 46 54 -37 43.1   18.24 16.72     ~ 1 0
145 [HWS2003] X178 X 07 46 55 -38 22.7   17.37 15.77     ~ 1 0
146 [HWS2003] X160 X 07 47 04 -38 12.5   17.88 16.32     ~ 1 0
147 [HWS2003] X90 X 07 47 07 -37 57.7   16.91 15.97     ~ 1 0
148 HD 63465 * 07 47 24.9927224690 -38 30 40.105236095 4.32 4.952 5.068     B2IV/V 62 0
149 CD-38 3650B * 07 47 25.9209207988 -38 30 38.872116904   11.37 10.90     ~ 5 0
150 CD-37 3910 * 07 47 25.9410366677 -37 48 15.502328605   11.85 11.37     ~ 8 0
151 Cl* NGC 2451 PKB 2381 * 07 47 44.1734945948 -37 59 03.151914874   12.585 11.860     ~ 11 0
152 [HWS2003] X117 X 07 48 07 -38 02.2   13.40 12.54     ~ 2 0
153 [HWS2003] X120 X 07 48 14 -38 02.9   13.24 12.62     ~ 1 0
154 GSC 07645-02133 ** 07 48 18.538 -38 22 38.58           ~ 3 0

    Equat.    Gal    SGal    Ecl

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