1998A&A...335..517B

Query : 1998A&A...335..517B

1998A&A...335..517B - Astronomy and Astrophysics, volume 335517-521 (1998/7-2)

Soft X-ray emission from intermediate-age open clusters: IC 4651.

BELLONI T. and TAGLIAFERRI G.

Abstract (from CDS):

We present the results of soft X-ray observations of the intermediate-age open cluster IC 4651 performed with the ROSAT PSPC. We detected 25 sources. Two are identified with a giant binary and a blue straggler respectively, both belonging to the cluster, and two with probable main-sequence members. Two other cases have ambiguous identification. Of the five binaries known in the cluster, the one detected in X rays is the only one whose period is short enough to maintain fast rotation and therefore strong stellar activity at a high age. The detected blue straggler is probably binary, suggesting that binarity is the key to producing a high level of X-ray emission. It is the third blue straggler detected in X rays. The remaining sources need to be identified through optical follow-up.

Abstract Copyright: ∼

Journal keyword(s): stars: activity - open clusters and associations: individual: IC 4651 - X-rays: stars

Nomenclature: Table 1: Cl* IC 4651 BT NN (Nos 1-25).

Simbad objects: 39

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Number of rows : 39
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 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
2 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
3 NGC 2527 OpC 08 05 02.4 -28 07 06   6.81 6.5     ~ 119 0
4 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
5 Cl* IC 4651 BT 4 * 16 26 08.1 -49 44 53           ~ 1 0
6 Cl* IC 4651 BT 1 * 17 23 14.7801259032 -49 56 13.829984052   11.52 10.96     ~ 2 0
7 Cl* IC 4651 BT 17 * 17 23 25.8 -49 58 09           ~ 1 0
8 Cl* IC 4651 BT 9 * 17 23 36.9 -49 53 34           ~ 1 0
9 CD-49 11383 * 17 23 37.5850707048 -50 00 13.135235868   9.752 9.29     ~ 3 0
10 Cl* IC 4651 BT 15 * 17 23 37.7 -49 57 16           ~ 1 0
11 Cl* IC 4651 BT 23 * 17 23 37.8 -50 03 15           ~ 1 0
12 Cl* IC 4651 BT 22 ** 17 23 45.83352 -50 02 51.8964           ~ 1 0
13 Cl* IC 4651 BT 5 * 17 23 47.9361148464 -49 45 45.399213540   13.13 11.93 11.60   ~ 1 0
14 Cl* IC 4651 BT 3 * 17 24 09.8581567224 -49 44 23.463210408   11.12 10.70     ~ 3 0
15 Cl* IC 4651 BT 6 * 17 24 22.9 -49 46 41           ~ 1 0
16 Cl* IC 4651 BT 18 * 17 24 36.8 -49 59 18           ~ 1 0
17 Cl* IC 4651 BT 12 * 17 24 38.8039989408 -49 55 59.899951668   15.56 14.82     ~ 9 0
18 Cl* IC 4651 BT 21 * 17 24 42.2 -50 01 42           ~ 1 0
19 IC 4651 13 * 17 24 44.6735447544 -49 55 04.694760804   12.6 11.8     ~ 5 0
20 Cl* IC 4651 AMC I-119 * 17 24 45.1220250240 -49 54 56.852247096   17.79 16.93 15.91   ~ 3 0
21 IC 4651 11 * 17 24 45.6475725552 -49 55 00.677162136       12.23   ~ 9 0
22 Cl* IC 4651 MEI 8399 * 17 24 45.7949417568 -49 54 56.815218468   16.47 15.52     ~ 9 0
23 IC 4651 77 * 17 24 46.0312725864 -49 54 51.049071684   14.09 13.53 13.48   ~ 17 0
24 Cl* IC 4651 MEI 8455 * 17 24 46.1446376568 -49 55 04.045728648   16.53 15.21     ~ 3 0
25 IC 4651 12 * 17 24 46.86 -49 52 05.6   12.3 11.9     ~ 2 0
26 IC 4651 OpC 17 24 48.5 -49 55 23           ~ 374 0
27 IC 4651 241 SB* 17 24 56.5565133384 -49 50 04.822729800   12.15 10.970     ~ 15 0
28 Cl* IC 4651 BT 25 * 17 25 02.0272163376 -50 04 55.553242692   12.25 11.69     ~ 2 0
29 Cl* IC 4651 BT 7 * 17 25 04.2 -49 47 37           ~ 1 0
30 CD-49 11414 BS* 17 25 05.5558318320 -49 56 45.262981788   10.81 10.54     A3 22 0
31 Cl* IC 4651 BT 13 * 17 25 10.4 -49 55 59           ~ 1 0
32 IC 4651 234 * 17 25 29.5956748656 -49 54 05.294783700   14.77 14.14     ~ 2 0
33 Cl* IC 4651 BT 24 * 17 25 45.4 -50 04 20           ~ 1 0
34 Cl* IC 4651 BT 19 * 17 25 55.4 -50 00 05           ~ 1 0
35 Cl* IC 4651 BT 16 * 17 26 09.9 -49 58 03           ~ 1 0
36 Cl* IC 4651 BT 20 * 17 26 20.4 -50 01 24           ~ 1 0
37 NGC 6940 OpC 20 34 28.4 +28 17 07           ~ 215 0
38 Cl* IC 4651 AMC 4218 * ~ ~   16.21 15.15     ~ 2 0
39 Cl* IC 4651 AMC 4219 * ~ ~   16.57 15.81     ~ 2 0

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