2000PASP..112..599S

Query : 2000PASP..112..599S

2000PASP..112..599S - Publ. Astron. Soc. Pac., 112, 599-609 (2000/May-0)

X-ray observations of two intermediate-age open clusters: NGC 1039 and NGC 3532.

SIMON T.

Abstract (from CDS):

Soft X-ray images of the intermediate-age (∼250 Myr) NGC 1039 and NGC 3532 open star clusters have been acquired with the ROSAT High Resolution Imager, resulting in the detection of 75 sources above a 3 σ detection level of LX≃2.5x1029 ergs.s–1. Roughly half the sources detected in both images have likely optical counterparts from earlier ground-based surveys. The remainder are either prospective cluster members or foreground/background stars, which can be decided only through additional photometry, spectroscopy, and proper-motion studies. There is some indication (at the 98% confidence level) that solar-type stars in both clusters, and in the similarly aged NGC 6475 cluster, may lack the extreme rotation and activity levels shown by those in the much younger Pleiades and α Persei clusters, but a detailed assessment of the coronal X-ray properties of these clusters must await more sensitive observations in the future. If confirmed, this finding could help to rule out the possibility that stellar dynamo activity and rotational braking are controlled by a rapidly spinning central core as stars pass through this phase of evolution from the Pleiades stage to that represented by the Hyades.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual (NGC 1039, NGC 3532) - X-Rays

Nomenclature: Table 1: [S2000d] NGC 1039 NN (Nos 1-32). Table 2: [S2000d] NGC 3532 NN (Nos 1-43).

Simbad objects: 92

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Number of rows : 92
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 LAWDS NGC 1039 4 QSO 02 41 19.1912112696 +42 47 28.640151276   19.406 19.131     ~ 2 0
2 [S2000d] NGC 1039 2 X 02 41 25.1 +42 49 55           ~ 1 0
3 [S2000d] NGC 1039 3 X 02 41 31.6 +42 48 31           ~ 1 0
4 NGC 1039 201 * 02 41 32.7735465881 +42 36 42.002728542   12.88 12.32     ~ 9 0
5 V* V797 Per BY* 02 41 35.2538631341 +42 41 02.494183444   15.406 14.546   13.552 ~ 15 0
6 Cl* NGC 1039 JP 167 Ro* 02 41 36.6134202360 +42 50 20.081944104   15.547 14.659   13.608 ~ 13 0
7 [S2000d] NGC 1039 7 X 02 41 37.2 +42 55 11           ~ 1 0
8 [S2000d] NGC 1039 8 X 02 41 40.6 +42 42 12           ~ 1 0
9 LAWDS NGC 1039 8 QSO 02 41 51.5853058560 +42 45 28.054502064   19.666 19.587     ~ 2 0
10 NGC 1039 253 * 02 41 52.2694586328 +42 44 37.527686412   12.69 12.21     G0 20 0
11 [S2000d] NGC 1039 10 X 02 41 53.9 +42 35 19           ~ 1 0
12 NGC 1039 259 * 02 41 54.6815821584 +42 47 44.297938284   12.79 12.30     ~ 7 0
13 NGC 1039 265 * 02 41 57.8766451128 +42 48 48.417712020   13.43 12.60 12.61   ~ 17 0
14 [S2000d] NGC 1039 13 X 02 41 59.0 +42 55 05           ~ 1 0
15 NGC 1039 284 * 02 42 06.4063915224 +42 45 56.794627800   10.95 10.67     A1 24 0
16 NGC 1039 287 * 02 42 06.8723479440 +42 47 46.579686540   12.97 12.44 12.35   ~ 20 0
17 Cl* NGC 1039 IS 182 * 02 42 08.7093042048 +42 41 46.961266524   13.87 13.15     ~ 12 0
18 NGC 1039 OpC 02 42 09.1 +42 44 02           ~ 467 0
19 Cl* NGC 1039 IS 184 * 02 42 09.3811194336 +42 42 05.520080484   14.19 13.33     ~ 7 0
20 Cl* NGC 1039 IS 181 * 02 42 09.3969028584 +42 49 42.760441812   14.20 12.99     ~ 3 0
21 V* V832 Per BY* 02 42 11.7078403848 +42 43 48.251947188   16.69 15.64     ~ 11 0
22 BD+42 594 * 02 42 12.1326034728 +42 47 10.952510676   10.06 9.92     A0 27 0
23 BD+42 596 * 02 42 13.4611629768 +42 46 40.638521784   8.86 8.80     A0IV 31 0
24 [S2000d] NGC 1039 20 X 02 42 17.4 +42 33 39           ~ 1 0
25 [S2000d] NGC 1039 21 X 02 42 18.6 +42 56 53           ~ 1 0
26 NGC 1039 320 * 02 42 18.9220312464 +42 46 48.777519612   12.95 12.44     ~ 13 0
27 [S2000d] NGC 1039 23 X 02 42 27.1 +42 43 22           ~ 1 0
28 V* V846 Per BY* 02 42 31.5394551744 +42 37 10.527987612   17.01 15.93     ~ 14 0
29 V* V847 Per BY* 02 42 32.2848031100 +42 49 05.945042396   16.1 15.02     ~ 20 0
30 HD 16771 RG* 02 42 35.7583124016 +42 35 28.459453272   8.26 7.34     G5 19 0
31 [S2000d] NGC 1039 27 X 02 42 39.7 +42 43 46           ~ 1 0
32 Cl* NGC 1039 JP 470 * 02 42 43.3213909944 +42 42 33.878873304   15.3 14.48     ~ 2 0
33 [S2000d] NGC 1039 29 X 02 42 47.7 +42 47 21           ~ 1 0
34 V* V864 Per BY* 02 42 50.7705996312 +42 58 07.851505080     14.88     ~ 12 0
35 [S2000d] NGC 1039 31 X 02 42 52.4 +42 48 10           ~ 1 0
36 V* V868 Per BY* 02 42 57.8371844703 +42 58 03.854880882   15.79 14.85     ~ 14 0
37 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
38 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
39 V* V471 Tau SB* 03 50 24.9666549840 +17 14 47.430910716   10.258 9.373   8.393 K2V+DA 697 0
40 HD 284163A RS* 04 11 56.2265138688 +23 38 10.912773408   10.470 9.392     K0 120 0
41 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
42 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
43 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
44 IC 2602 OpC 10 42 55.9 -64 25 22           ~ 735 0
45 * eta Car s*b 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2543 0
46 Cl* NGC 3532 FERN 277 * 11 04 13.8972471504 -58 45 52.240995900   13.274 12.733 12.402 12.090 ~ 22 0
47 [S2000d] NGC 3532 37 X 11 04 14.9 -58 44 31           ~ 1 0
48 Cl* NGC 3532 FERN 268 * 11 04 17.8517841144 -58 39 41.855211504   14.24 13.22     ~ 4 0
49 [S2000d] NGC 3532 3 X 11 04 30.5 -58 38 58           ~ 1 0
50 HD 96174 SB* 11 04 33.8435445792 -58 41 39.407659548   8.676 7.751 7.286 6.828 G8III 30 0
51 Cl* NGC 3532 FERN 169 * 11 04 35.5990667112 -58 48 25.052548932   12.71 12.25     ~ 20 0
52 Cl* NGC 3532 FERN 146 * 11 04 37.4897161224 -58 39 03.836879424   13.249 12.676 12.346 12.017 ~ 18 0
53 Cl* NGC 3532 FERN 302 * 11 04 50.0652328584 -58 55 59.126548836   12.42 11.91     ~ 6 0
54 Cl* NGC 3532 FERN 149 * 11 04 52.8315625296 -58 40 55.777866564   13.617 13.027 12.677 12.351 ~ 20 0
55 [S2000d] NGC 3532 7 X 11 05 03.4 -58 37 27           ~ 1 0
56 Cl* NGC 3532 FERN 35 * 11 05 06.3902784024 -58 42 09.584512344   13.78 13.36     ~ 12 0
57 2MASS J11051040-5850295 * 11 05 10.4109652704 -58 50 29.448526200           ~ 14 0
58 2MASS J11051251-5842179 * 11 05 12.5153180808 -58 42 17.983634364           ~ 20 0
59 CPD-58 3057 * 11 05 18.5024378160 -58 46 15.461210316   9.724 9.635 9.561 9.512 A2V 16 0
60 2MASS J11052075-5847577 * 11 05 20.7524693760 -58 47 57.704370756           ~ 5 0
61 NGC 3532 92 * 11 05 21.8008794000 -58 44 38.482206432   12.186 11.729 11.426 11.158 ~ 4 0
62 2MASS J11052559-5840079 * 11 05 25.5987477168 -58 40 07.889736720   17.689 16.458 15.659 14.887 ~ 18 0
63 NGC 3532 OpC 11 05 33.9 -58 42 13           ~ 414 0
64 Cl* NGC 3532 FERN 128 * 11 05 34.0255330368 -58 39 09.386903232   12.91 12.42     ~ 21 0
65 HD 96387 * 11 05 40.5981938784 -58 43 53.058030024   8.724 8.658 8.565 8.531 A1V 36 0
66 [S2000d] NGC 3532 15 X 11 05 42.97 -58 35 23.6           ~ 2 0
67 2MASS J11054337-5850536 * 11 05 43.3723763544 -58 50 53.575311768   17.371 16.090 15.337 14.536 ~ 11 0
68 CPD-58 3077 * 11 05 45.6255877152 -58 40 39.418236120   9.130 8.189 7.671 7.182 G6III 34 0
69 Cl* NGC 3532 FERN 242 * 11 05 47.0739295920 -58 36 48.888474660   12.76 12.18     ~ 20 0
70 [S2000d] NGC 3532 19 X 11 05 51.0 -58 42 22           ~ 1 0
71 2MASS J11055229-5842585 * 11 05 52.2825739032 -58 42 58.524250932           ~ 17 0
72 [S2000d] NGC 3532 20 X 11 05 52.4 -58 51 12           ~ 1 0
73 [FRP2000] 47 * 11 05 53.3102033819 -58 54 22.514447315           ~ 6 0
74 HD 96430 Em* 11 05 53.5213027968 -58 39 45.619287264   8.426 8.489 8.571 8.589 B6IV/Ve 18 0
75 CPD-58 3086B * 11 05 54.9172808448 -58 48 59.597344296   9.909 9.732 9.623 9.482 A2V 19 0
76 Cl* NGC 3532 FERN 196 * 11 06 01.2166858704 -58 50 25.514878812   12.711 12.230 11.954 11.659 ~ 20 0
77 [FRP2000] 2 X 11 06 03.56 -58 35 08.8           ~ 2 0
78 Cl* NGC 3532 FERN 90 * 11 06 08.6803506576 -58 43 27.400982304   12.41 11.78     ~ 20 0
79 Cl* NGC 3532 FERN 84 * 11 06 08.8482665304 -58 45 51.714849888   12.56 12.03     ~ 10 0
80 NGC 3532 144 * 11 06 16.0004949768 -58 33 34.354254492   12.28 11.52 11.41   ~ 5 0
81 [S2000d] NGC 3532 30 X 11 06 20.8 -58 40 41           ~ 1 0
82 Cl* NGC 3532 FERN 102 * 11 06 22.7291995896 -58 40 57.911586564   13.836 13.195 12.842 12.502 ~ 21 0
83 [FRP2000] 6 X 11 06 29.65 -58 37 07.4           ~ 2 0
84 Cl* NGC 3532 FERN 229 * 11 06 32.9422945560 -58 37 48.416412612   13.80 13.14     ~ 9 0
85 [S2000d] NGC 3532 34 X 11 06 33.8 -58 34 21           ~ 1 0
86 Cl* NGC 3532 FERN 354 * 11 06 52.6406645088 -58 44 58.957136232   12.76 12.42     ~ 9 0
87 [FRP2000] 35 X 11 07 03.09 -58 45 50.1           ~ 2 0
88 HD 96653 * 11 07 08.2390902960 -58 42 58.916983248   8.345 8.335 8.300 8.290 A0IIIn 45 0
89 CPD-58 3154 * 11 07 21.4320187632 -58 48 15.756706404   11.086 10.823 10.669 10.511 A8IV 21 0
90 [S2000d] NGC 3532 43 X 11 07 34.7 -58 42 35           ~ 1 0
91 NGC 6475 OpC 17 53 44.1 -34 49 36           ~ 413 0
92 IC 4756 OpC 18 38 39.0 +05 26 14           ~ 274 0

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