2004ApJ...606..466W

Query : 2004ApJ...606..466W

2004ApJ...606..466W - Astrophys. J., 606, 466-482 (2004/May-1)

Coronal variability in the young cluster NGC 2516.

WOLK S.J., HARNDEN F.R.Jr, MURRAY S.S., ADAMS N.R., DAMIANI F., FLACCOMIO E., MICELA G., SCIORTINO S. and JEFFRIES R.D.

Abstract (from CDS):

NGC 2516 has been observed by Chandra several times in order to correct the plate scale of the spacecraft's focal plane instruments. Because of this, Chandra has observed NGC 2516 with all four imaging arrangements available. In addition, NGC 2516 has been observed as part of the High Resolution Camera (HRC) guaranteed time program and is scheduled for return plate scale calibration visits. This makes it the best cluster to study for long-term variability. NGC 2516 is about 140 Myr old and less than 400 pc away. In our first paper, we discussed the detection of 150 X-ray sources (42% of which are identified as cluster members) in the calibration data taken during the orbital activation phase of the Chandra mission. In our second paper, we combined all the extant data sets and detected 284 sources, more than half of which are considered likely cluster members. In this our third paper, we further explore techniques of combining Advanced CCD Imaging Spectrometer (ACIS) and HRC Chandra data for timing analysis. We have been able to combine almost 70 ks of observation time, spread over five epochs, to study variability in this cluster on multiple timescales. We find that while stochastic variability rates are about the same for all objects in the sample, the timescale for detecting variability is shorter for late-type stars. Both stochastic and flare variability rates seen in NGC 2516 are similar to those seen in younger clusters IC 348, NGC 1333, and M42.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 2516 - Stars: Coronae - X-Rays: Stars

VizieR on-line data: <Available at CDS (J/ApJ/606/466): table1.dat>

Simbad objects: 110

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Number of rows : 110
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 NGC 1333 OpC 03 29 09.2 +31 20 59           ~ 1575 1
2 IC 348 OpC 03 44 31.1 +32 10 02           ~ 1476 1
3 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
4 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
5 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
6 NAME Ori A MoC 05 38 -07.1           ~ 3187 0
7 [DFM2003] 1 X 07 56 22.50 -60 51 42.2           ~ 2 0
8 Cl* NGC 2516 JTH 4598 * 07 56 34.6350694752 -60 48 03.459350052   14.845 13.984   12.968 ~ 26 0
9 CPD-60 944B Pu* 07 56 46.2620797099 -60 48 58.296559706   8.77 8.76     B8III 53 0
10 Cl* NGC 2516 JTH 5024 * 07 56 47.0908328064 -60 43 22.543973832   17.655 16.324   14.669 K7.1 35 0
11 NGC 2516 4 * 07 56 47.8337123472 -60 56 49.858610856   11.1 10.8   10.402 A7III 31 0
12 Cl* NGC 2516 JTH 5061 * 07 56 48.1765994568 -60 46 31.113432048   16.678 15.410   13.865 K6.1 33 0
13 Cl* NGC 2516 JTH 5447 * 07 56 59.5633374888 -60 49 56.692237836   17.903 16.555   14.64 K9.7 36 0
14 [DFM2003] 8 X 07 57 11.72 -60 33 09.5           ~ 2 1
15 Cl* NGC 2516 DAC 233 SB* 07 57 14.1713644152 -60 40 52.419243900   12.914 12.240   11.471 ~ 19 0
16 NGC 2516 100 * 07 57 16.2642330288 -60 47 13.556825412   12.58 12.04   11.383 ~ 45 0
17 [DFM2003] 11 * 07 57 18.40 -60 48 16.3           ~ 4 0
18 Cl* NGC 2516 JTH 6220 * 07 57 19.4810686848 -60 56 28.617841644   16.3 15.123     ~ 11 0
19 CD-60 1936 * 07 57 19.8110014152 -60 48 46.298213784   9.49 9.30     B9V 45 0
20 Cl* NGC 2516 SBL 332 SB* 07 57 20.8263047693 -60 44 03.506854478   16.219 15.150 14.797 13.741 K3.8 21 0
21 NGC 2516 107 * 07 57 23.1724381440 -60 49 38.491908888   11.85 11.30   10.661 ~ 31 0
22 Cl* NGC 2516 JTH 6423 * 07 57 24.4589190696 -60 39 48.530218356   18.708 17.825     ~ 3 0
23 Cl* NGC 2516 DAC 308 * 07 57 25.2121054104 -60 46 47.308660716 13.89 13.79 13.09   12.253 ~ 42 0
24 JTX 43 * 07 57 25.24 -60 44 59.5           ~ 5 0
25 JTX 45 X 07 57 26.73 -60 39 46.9           ~ 3 0
26 [DFM2003] 25 X 07 57 29.37 -60 52 11.1           ~ 3 0
27 Cl* NGC 2516 JTH 6605 * 07 57 29.3700037272 -60 50 10.361403852   14.455 13.643   12.683 ~ 22 0
28 Cl* NGC 2516 EGG 111 SB* 07 57 30.9392174112 -60 48 31.764994128 15.26 15.00 14.08   13.058 ~ 12 0
29 CPD-60 956 * 07 57 31.7513283496 -60 59 29.594332227   11.201 10.838 10.860   ~ 28 0
30 [DFM2003] 30 X 07 57 32.52 -60 41 11.7           ~ 3 0
31 Cl* NGC 2516 JTH 6854 * 07 57 36.04 -60 50 26.2   19.932 19.302     ~ 3 0
32 CD-60 1946 SB* 07 57 37.8603841224 -60 54 32.082010704   8.89 8.81     B9V+A4V 49 0
33 Cl* NGC 2516 JTH 7001 * 07 57 39.8286681432 -60 46 39.310440060   17.044 15.707   14.109 K6.0 30 0
34 Cl* NGC 2516 DAC 306 * 07 57 44.0657717856 -60 47 27.876242544 14.79 14.59 13.83     ~ 11 0
35 NGC 2516 93 V* 07 57 46.0801430304 -60 48 39.500081424   11.42 11.13   10.671 ~ 28 0
36 HD 65949 * 07 57 47.6703410424 -60 36 34.921501344 7.99 8.31 8.37     B8/9 108 0
37 Cl* NGC 2516 DAC 238 SB* 07 57 48.3525026544 -60 31 30.736331616   12.73 12.17   11.52 ~ 19 0
38 Cl* NGC 2516 JTH 7560 * 07 57 54.71 -60 35 57.7   19.345 17.638     ~ 3 0
39 Cl* NGC 2516 DAC 403 SB* 07 57 55.4026796472 -60 48 27.198283896   13.624 12.905   12.029 ~ 35 0
40 Cl* NGC 2516 DAC 219 SB* 07 57 55.6225664256 -60 40 39.269930052   13.234 12.632   11.933 ~ 26 0
41 NGC 2516 89 * 07 57 56.8318778376 -60 50 33.850832172   13.326 12.706   11.938 ~ 26 0
42 CD-60 1959 Pu* 07 57 57.3733007832 -60 44 16.168255512   10.05 9.87   9.642 A2V 30 0
43 Cl* NGC 2516 EGG 27 * 07 57 57.6789191197 -60 53 38.925055596   15.494 14.532 14.227 13.377 K2.6 38 0
44 Cl* NGC 2516 JTH 7708 ** 07 57 58.35744 -60 52 48.4428   19.357 17.643     ~ 5 0
45 Cl* NGC 2516 DAC 513 SB* 07 57 59.3204884680 -60 56 53.455933428   13.302 12.647   11.845 G 35 0
46 Cl* NGC 2516 JTH 7782 * 07 58 00.35 -60 52 12.2   17.178 15.761   14.055 ~ 15 0
47 Cl* NGC 2516 JTH 7789 * 07 58 00.37 -60 40 43.4   20.935 20.718     ~ 3 0
48 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
49 NGC 2516 85 SB* 07 58 02.3958635640 -60 46 47.314297956 12.71 12.67 12.07   11.327 ~ 37 0
50 Cl* NGC 2516 JTH 7999 * 07 58 06.16 -60 35 54.1   15.807 14.410     ~ 4 0
51 NGC 2516 86 SB* 07 58 08.8496785944 -60 44 40.222744908 12.79 12.807 12.225 12.104 11.544 ~ 31 0
52 V* V392 Car SB* 07 58 10.4770762032 -60 51 57.409042680   9.69 9.48     A2Vp:Sr:Cr:Eu: 80 0
53 [DFM2003] 99 X 07 58 14.38 -60 36 01.1           ~ 2 0
54 Cl* NGC 2516 JTH 8404 * 07 58 16.5801893088 -60 52 12.273808980     18.862   16.348 ~ 19 0
55 Cl* NGC 2516 JTH 8446 * 07 58 17.8300572288 -60 50 41.386807500     19.046     ~ 4 0
56 NGC 2516 111 * 07 58 18.0219079344 -60 45 15.310702800   11.93 11.43   10.800 ~ 34 0
57 Cl* NGC 2516 JTH 8502 * 07 58 19.2603399480 -60 52 00.001060140   16.382 15.246   14.012 ~ 19 0
58 Cl* NGC 2516 DAC 907 * 07 58 19.8589117944 -60 41 58.192665396 12.98 12.99 12.39   11.627 ~ 30 0
59 HD 66066B * 07 58 22.2659936496 -60 51 22.338259740   7.70 7.69     B8 28 0
60 Cl* NGC 2516 JTH 8634 SB* 07 58 22.9383349176 -60 40 20.371344492   15.459 14.516   13.398 K2.9 40 0
61 Cl* NGC 2516 EGG 16 SB* 07 58 23.3983736471 -60 54 56.881441282 15.58 15.16 14.21   12.979 ~ 29 0
62 Cl* NGC 2516 DAC 921 SB* 07 58 23.6256785256 -60 37 22.009815228   12.925 12.354   11.682 ~ 38 0
63 CD-60 1976 * 07 58 29.6867934672 -60 41 51.081972684   9.77 9.66   9.603 A0V 43 0
64 Cl* NGC 2516 JTH 8893 * 07 58 29.8104648192 -60 49 00.494385600   17.609 16.176   14.351 ~ 18 0
65 V* V419 Car dS* 07 58 30.9350301312 -60 37 46.501853340   10.94 10.60   10.197 A8V 34 0
66 Cl* NGC 2516 EGG 13 SB* 07 58 31.5173932104 -60 53 10.234477500   16.36 15.18   13.623 ~ 28 0
67 CD-60 1981 SB* 07 58 32.0640327096 -60 53 51.246269844   10.8 10.7   10.258 A1Vm: 52 0
68 Cl* NGC 2516 JTH 8997 * 07 58 32.2098865032 -60 46 00.924525696   15.592 14.611 14.29 13.470 ~ 24 0
69 Cl* NGC 2516 JTH 9035 * 07 58 33.0440354304 -60 51 28.953053280     18.567   15.937 ~ 18 0
70 NGC 2516 78 * 07 58 33.3890177472 -60 44 27.417074568 13.62 13.53 12.84   12.005 ~ 34 0
71 Cl* NGC 2516 DAC 803 * 07 58 35.7255758376 -60 46 52.490530344 14.30 14.008 13.255 13.118 12.567 ~ 46 0
72 Cl* NGC 2516 JTH 9153 * 07 58 36.1299430680 -60 46 18.299244036     19.193   16.604 ~ 15 0
73 NGC 2516 72 ** 07 58 36.465816 -60 50 18.36132   12.30 11.69 11.55 10.980 ~ 28 0
74 NGC 2516 76 * 07 58 40.0493192208 -60 41 42.966782916   12.773 12.212   11.539 ~ 39 0
75 Cl* NGC 2516 JTH 9429 * 07 58 42.0392395320 -60 50 40.064439084   19.611 18.231     ~ 14 0
76 Cl* NGC 2516 DAC 664 SB* 07 58 43.2597904104 -60 55 25.736785572   14.658 13.840   12.877 G 43 0
77 Cl* NGC 2516 JTH 9467 * 07 58 43.3136765424 -60 41 45.711150180   18.082 16.950     ~ 17 0
78 Cl* NGC 2516 DAC 933 SB* 07 58 43.7570207761 -60 32 56.732177572   13.409 12.620 12.414 11.743 ~ 28 0
79 Cl* NGC 2516 EGG 10 SB* 07 58 48.0488294928 -60 54 14.343021252   15.24 14.34   13.287 ~ 42 0
80 JTX 120 * 07 58 49.36 -60 42 12.7           ~ 4 0
81 HD 66194 Be* 07 58 50.5509433080 -60 49 28.060460040 4.92 5.72 5.81 5.77 5.83 B3Vn 153 0
82 HD 66167 * 07 58 50.9506083696 -60 38 35.358436212   9.15 9.01 9.87   A0V 35 0
83 Cl* NGC 2516 JTH 9835 * 07 58 51.8741169888 -60 35 20.326570836   15.769 14.781   13.654 ~ 24 0
84 NGC 2516 71 * 07 58 52.3073093315 -60 53 37.666799771   12.80 12.14   11.384 ~ 19 0
85 CD-60 1993 * 07 58 53.0151207336 -60 36 10.592172072   9.95 9.78   9.542 A1/2V 31 0
86 Cl* NGC 2516 JTH 9908 LM* 07 58 53.6017884504 -60 54 24.165131256   18.383 16.856   14.768 M0.7 38 0
87 Cl* NGC 2516 JTH 10010 LM* 07 58 56.3889987408 -60 47 22.920728532   18.675 17.183   15.253 M0.6 35 0
88 Cl* NGC 2516 JTH 10017 LM* 07 58 56.5888346544 -60 52 15.987060480   18.996 17.441   15.277 M1.4 20 0
89 [DFM2003] 166 X 07 58 57.21 -60 36 09.9           ~ 2 0
90 Cl* NGC 2516 JTH 10046 SB* 07 58 57.5495425896 -60 43 00.960651300   15.750 14.760   13.620 K3.3 38 0
91 Cl* NGC 2516 JTH 10047 * 07 58 57.6076283400 -60 40 58.654388172   20.155 18.463   16.119 M2.0 32 0
92 [DFM2003] 168 X 07 58 57.66 -60 43 13.3           ~ 2 0
93 Cl* NGC 2516 JTH 10143 * 07 59 00.5586372000 -60 44 10.522102416     19.899   16.885 ~ 13 0
94 JTX 132 X 07 59 03.85 -60 52 36.9           ~ 5 0
95 Cl* NGC 2516 JTH 10300 * 07 59 04.9946904384 -60 44 27.045018276   19.291 17.625     ~ 18 0
96 [DFM2003] 175 X 07 59 08.59 -60 50 49.9           ~ 2 1
97 [DFM2003] 177 * 07 59 11.74 -60 42 21.6           ~ 3 0
98 Cl* NGC 2516 JTH 10702 * 07 59 15.8262667872 -60 47 34.632989124   17.761 16.266   14.416 ~ 20 0
99 [DFM2003] 179 X 07 59 17.89 -60 55 26.9           ~ 2 0
100 Cl* NGC 2516 JTH 10754 LM* 07 59 17.9674055304 -60 45 18.912936204   19.396 17.771   15.393 M2.5 28 0
101 V* V422 Car a2* 07 59 21.2942838672 -60 48 56.393118468   9.13 9.08     B8/9pSi 84 0
102 NGC 2516 73 SB* 07 59 21.3452063842 -60 46 02.810925108   12.934 12.338 12.249 11.646 ~ 27 0
103 NGC 2516 74 * 07 59 22.1649552744 -60 45 26.730954936   12.49 11.87     ~ 27 0
104 CD-60 2003 * 07 59 23.2610454552 -60 47 32.237563668   10.41 9.85     ~ 16 0
105 HD 66318 * 07 59 27.4731907320 -60 47 47.144978988   9.69 9.56   9.555 A2:IV:pSiSrCr 99 0
106 Cl* NGC 2516 DAC 96 SB* 07 59 32.1031859703 -60 48 45.029781686   14.798 13.941 13.669 12.860 K2.0 37 0
107 Cl* NGC 2516 DAC 877 * 07 59 36.4374649320 -60 44 31.737319620   13.725 12.898     ~ 8 0
108 Cl* NGC 2516 DAC 879 SB* 07 59 40.0022314272 -60 42 31.216704084   15.820 14.774   13.568 ~ 25 0
109 [DFM2003] 205 X 07 59 41.17 -60 45 24.1           ~ 2 0
110 Cl* NGC 2516 JTH 11829 * 07 59 51.24 -60 43 20.0   19.785 19.226     ~ 2 0

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