2000A&A...357..139F

Query : 2000A&A...357..139F

2000A&A...357..139F - Astronomy and Astrophysics, volume 357139-144 (2000/5-1)

A ROSAT HRI study of the open cluster NGC 3532.

FRANCIOSINI E., RANDICH S. and PALLAVICINI R.

Abstract (from CDS):

NGC 3532 is a very rich southern open cluster of age ∼200-350Myr; it is therefore a good candidate to investigate the X-ray activity-age-rotation relationship at ages intermediate between the Pleiades and the Hyades, where, to our knowledge, X-ray studies exist for only one cluster (NGC 6475). We have performed an X-ray study of NGC 3532 using HRI observations retrieved from the ROSAT archive. The observations have a limiting sensitivity Lx∼4x1028erg/s in the center of the field. We detected ∼50 X-ray sources above a 4 σ threshold, half of which have a known optical counterpart within 10 arcsec; 15 of the X-ray sources have at least one cluster member as optical counterpart. A comparison of NGC 3532 with the nearly coeval cluster NGC 6475 indicates that the former cluster is considerably X-ray underluminous with respect to NGC 6475. However, because of the existence of possible selection effects, additional X-ray and optical observations are needed before definitively concluding that the X-ray properties of NGC 3532 and NGC 6475 are significantly different.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: open clusters and associations: individual: NGC 3532 - stars: coronae - X-rays: stars

Nomenclature: Tables 1-3: [FRP2000] NN (Nos 1-49).

Simbad objects: 55

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Number of rows : 55
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 Cl* NGC 3532 FERN 277 * 11 04 13.8972471504 -58 45 52.240995900   13.274 12.733 12.402 12.090 ~ 22 0
2 Cl* NGC 3532 FERN 268 * 11 04 17.8517841144 -58 39 41.855211504   14.24 13.22     ~ 4 0
3 HD 96174 SB* 11 04 33.8435445792 -58 41 39.407659548   8.676 7.751 7.286 6.828 G8III 30 0
4 CPD-58 3015 * 11 04 35.2292286336 -58 48 35.440217136   10.339 10.176 10.151 10.104 A2/3V 27 0
5 Cl* NGC 3532 FERN 169 * 11 04 35.5990667112 -58 48 25.052548932   12.71 12.25     ~ 20 0
6 Cl* NGC 3532 FERN 146 * 11 04 37.4897161224 -58 39 03.836879424   13.249 12.676 12.346 12.017 ~ 18 0
7 2MASS J11045086-5845439 * 11 04 50.8456787016 -58 45 43.789206096   18.460 17.083 16.178 15.290 ~ 10 0
8 Cl* NGC 3532 FERN 149 * 11 04 52.8315625296 -58 40 55.777866564   13.617 13.027 12.677 12.351 ~ 20 0
9 2MASS J11050232-5838588 * 11 05 02.3288184336 -58 38 58.867420812   20.010 18.506 17.400 16.047 ~ 12 0
10 GSC 08627-02833 X 11 05 03.49 -58 37 27.6     12.46     ~ 1 0
11 2MASS J11050630-5844418 * 11 05 06.2965940160 -58 44 41.833167648           ~ 2 0
12 Cl* NGC 3532 FERN 35 * 11 05 06.3902784024 -58 42 09.584512344   13.78 13.36     ~ 12 0
13 2MASS J11050991-5838301 * 11 05 09.9054811128 -58 38 30.161764572           ~ 2 0
14 2MASS J11051040-5850295 * 11 05 10.4109652704 -58 50 29.448526200           ~ 14 0
15 2MASS J11051251-5842179 * 11 05 12.5153180808 -58 42 17.983634364           ~ 20 0
16 CPD-58 3057 * 11 05 18.5024378160 -58 46 15.461210316   9.724 9.635 9.561 9.512 A2V 16 0
17 2MASS J11052075-5847577 * 11 05 20.7524693760 -58 47 57.704370756           ~ 5 0
18 NGC 3532 90 * 11 05 22.3058043288 -58 39 11.300895972   11.773 11.281 10.993 10.677 ~ 6 0
19 2MASS J11052559-5840079 * 11 05 25.5987477168 -58 40 07.889736720   17.689 16.458 15.659 14.887 ~ 18 0
20 Cl* NGC 3532 FERN 57 * 11 05 28.6469928240 -58 49 30.933368472   13.66 13.11     ~ 13 0
21 NGC 3532 OpC 11 05 33.9 -58 42 13           ~ 414 0
22 Cl* NGC 3532 FERN 128 * 11 05 34.0255330368 -58 39 09.386903232   12.91 12.42     ~ 21 0
23 CPD-58 3068 * 11 05 35.1935438784 -58 40 37.112255112 10.97 10.779 10.542 10.396 10.273 ~ 24 0
24 [S2000d] NGC 3532 15 X 11 05 42.97 -58 35 23.6           ~ 2 0
25 2MASS J11054337-5850536 * 11 05 43.3723763544 -58 50 53.575311768   17.371 16.090 15.337 14.536 ~ 11 0
26 CPD-58 3077 * 11 05 45.6255877152 -58 40 39.418236120   9.130 8.189 7.671 7.182 G6III 34 0
27 2MASS J11054608-5847242 * 11 05 46.1000244194 -58 47 24.296965328           ~ 2 0
28 Cl* NGC 3532 FERN 242 * 11 05 47.0739295920 -58 36 48.888474660   12.76 12.18     ~ 20 0
29 CPD-58 3080 * 11 05 49.4678919840 -58 42 11.904142824   9.639 9.555 9.481 9.437 A1V 25 0
30 [FRP2000] 46 X 11 05 52.01 -58 51 11.7           ~ 1 0
31 Cl* NGC 3532 FERN 314 * 11 05 52.2091318824 -58 55 34.795171524   12.68 12.11 12.08   ~ 20 0
32 2MASS J11055229-5842585 * 11 05 52.2825739032 -58 42 58.524250932           ~ 17 0
33 CD-57 3699 * 11 05 53.2141369656 -58 35 38.509484856   11.411 10.983 10.711 10.436 ~ 13 0
34 [FRP2000] 47 * 11 05 53.3102033819 -58 54 22.514447315           ~ 6 0
35 HD 96430 Em* 11 05 53.5213027968 -58 39 45.619287264   8.426 8.489 8.571 8.589 B6IV/Ve 18 0
36 CPD-58 3086B * 11 05 54.9172808448 -58 48 59.597344296   9.909 9.732 9.623 9.482 A2V 19 0
37 Cl* NGC 3532 FERN 196 * 11 06 01.2166858704 -58 50 25.514878812   12.711 12.230 11.954 11.659 ~ 20 0
38 [FRP2000] 2 X 11 06 03.56 -58 35 08.8           ~ 2 0
39 [FRP2000] 14 X 11 06 05.99 -58 39 35.7           ~ 1 0
40 Cl* NGC 3532 FERN 90 * 11 06 08.6803506576 -58 43 27.400982304   12.41 11.78     ~ 20 0
41 Cl* NGC 3532 FERN 84 * 11 06 08.8482665304 -58 45 51.714849888   12.56 12.03     ~ 10 0
42 NGC 3532 144 * 11 06 16.0004949768 -58 33 34.354254492   12.28 11.52 11.41   ~ 5 0
43 [FRP2000] 23 X 11 06 18.71 -58 41 03.0           ~ 1 0
44 2MASS J11061979-5840459 * 11 06 19.7897970408 -58 40 45.929244432   16.690 15.565 14.932 14.324 ~ 8 0
45 Cl* NGC 3532 FERN 102 * 11 06 22.7291995896 -58 40 57.911586564   13.836 13.195 12.842 12.502 ~ 21 0
46 Cl* NGC 3532 FERN 103 * 11 06 24.0236710512 -58 41 01.517652780   13.006 12.560 12.316 12.031 ~ 3 0
47 [FRP2000] 6 X 11 06 29.65 -58 37 07.4           ~ 2 0
48 Cl* NGC 3532 FERN 229 * 11 06 32.9422945560 -58 37 48.416412612   13.80 13.14     ~ 9 0
49 Cl* NGC 3532 FERN 219 * 11 06 45.5199514776 -58 41 24.172184508   11.76 11.23     ~ 20 0
50 Cl* NGC 3532 FERN 354 * 11 06 52.6406645088 -58 44 58.957136232   12.76 12.42     ~ 9 0
51 [FRP2000] 29 X 11 06 54.20 -58 42 23.0           ~ 1 0
52 [FRP2000] 35 X 11 07 03.09 -58 45 50.1           ~ 2 0
53 NGC 6475 OpC 17 53 44.1 -34 49 36           ~ 413 0
54 NGC 6633 OpC 18 27 30.2 +06 38 21           ~ 423 0
55 IC 4756 OpC 18 38 39.0 +05 26 14           ~ 274 0

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