2005A&A...430..287M


Query : 2005A&A...430..287M

2005A&A...430..287M - Astronomy and Astrophysics, volume 430, 287-301 (2005/1-4)

X-ray spectral and timing characteristics of the stars in the young open cluster IC 2391.

MARINO A., MICELA G., PERES G., PILLITTERI I. and SCIORTINO S.

Abstract (from CDS):

We present X-ray spectral and timing analysis of members of the young open cluster IC 2391 observed with the XMM-Newton observatory. We detected 99 X-ray sources by analysing the summed data obtained from MOS1, MOS2 and pn detectors of the EPIC camera; 24 of them are members, or probable members, of the cluster. Stars of all spectral types have been detected, from the early-types to the late-M dwarfs. Despite the capability of the instrument to recognize up to 3 thermal components, the X-ray spectra of the G, K and M members of the cluster are well described with two thermal components (at kT1∼0.3-0.5keV and kT2∼1.0-1.2keV respectively) while the X-ray spectra of F members require only a softer 1-T model. The Kolmogorov-Smirnov test applied to the X-ray photon time series shows that approximately 46% of the members of IC 2391 are variable with a confidence level >99%. The comparison of our data with those obtained with ROSAT/PSPC, nine years earlier, and ROSAT/HRI, seven years earlier, shows that there is no evidence of significant variability on these time scales, suggesting that long-term variations due to activity cycles similar to that on the Sun are not common, if present at all, among these young stars.

Abstract Copyright:

Journal keyword(s): X-ray: stars - stars: coronae - stars: activity - stars: early-type - stars: late-type - Galaxy: open clusters and associations: individual: IC 2391

VizieR on-line data: <Available at CDS (J/A+A/430/287): table1.dat table2.dat>

Nomenclature: Table 1: [MMP2005] NN (Nos 1-99).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 44

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Number of rows : 44
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Cl Melotte 20 OpC 03 26 28 +48 58.5           ~ 795 0
2 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3183 0
3 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2843 0
4 NGC 2516 OpC 07 58 06 -60 48.0           ~ 645 0
5 Cl* IC 2391 CTIO 1 * 08 35 38.5813370784 -53 13 15.333892572           ~ 2 0
6 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1384 0
7 HD 74196 Ce* 08 40 17.4649643448 -53 00 55.430609904 4.97 5.47 5.61     B9/A0 127 0
8 VXR HRI 7 * 08 40 36.8 -53 07 51     17.01     ~ 3 0
9 VXR HRI 10a * 08 41 04.100 -52 51 44.00     15.85     ~ 3 0
10 VXR PSPC 28b * 08 41 08.000 -53 00 08.00     17.75     ~ 2 0
11 VXR PSPC 29 X 08 41 09.4 -53 02 19           ~ 2 0
12 HD 74340 SB* 08 41 09.9773642568 -52 54 10.540967328   10.33 9.87     F5V 40 0
13 IC 2391 OpC 08 41 10 -52 59.5           ~ 766 0
14 VXR PSPC 32c * 08 41 11.400 -53 09 16.00     15.34     ~ 2 1
15 Cl* IC 2391 CTIO 96 * 08 41 12.3702510480 -53 09 10.096173972     19.64     ~ 10 1
16 Cl* IC 2391 H 21 PM* 08 41 16.1712190728 -53 04 26.015600928   12.51 11.69     ~ 10 0
17 DENIS J084122.1-530446 * 08 41 22.2018933288 -53 04 46.429740984     17.16 15.98 14.03 ~ 5 0
18 Cl* IC 2391 CTIO 100 * 08 41 35.9639264064 -53 09 26.835320448   19.37 18.52 17.27 15.14 ~ 9 1
19 VXR PSPC 37 X 08 41 38.6 -53 09 35           ~ 2 0
20 VXR PSPC 38 X 08 41 39.9 -52 59 44           ~ 2 0
21 Cl* IC 2391 PP 6 * 08 41 43.95 -53 14 06.8     17.74     ~ 4 0
22 HD 74438 * 08 41 46.5805673472 -53 03 44.995790376   7.81 7.58     A2mA5-A8 47 0
23 Cl* IC 2391 SHJM 7 SB* 08 41 52.1694642216 -53 06 46.668430332   13.62 12.52     G7 12 1
24 1RXS J084153.5-525800 * 08 41 53.5750348416 -52 57 55.619146260   18.12 17.44 16.24 14.31 ~ 9 0
25 V* V368 Vel BY* 08 41 57.8482531848 -52 52 13.942332264   14.59 13.76 12.74 12.03 K7e 29 0
26 Cl* IC 2391 CTIO 106 * 08 41 58.9885432560 -53 12 36.720815940           ~ 7 0
27 V* V369 Vel BY* 08 42 04.9310430360 -52 53 53.909397384           M3e 14 0
28 HD 74517 * 08 42 07.9897725768 -53 09 35.046730224   8.73 8.63     A3V 25 0
29 HD 74516 * 08 42 09.9561714480 -52 58 03.652619016   7.40 7.38     A1V 63 0
30 CD-52 2501 * 08 42 12.2935097520 -53 06 03.797278668           F5V 29 0
31 V* V370 Vel BY* 08 42 14.7556955232 -52 56 02.325566004   11.775 10.827 10.541 9.620 G9V 34 0
32 V* V371 Vel BY* 08 42 18.5563649256 -53 01 56.872692444   15.44       M2e 28 0
33 V* KT Vel a2* 08 42 18.9920732 -53 06 00.201557 4.79 5.340 5.474     B9III(pSi) 99 0
34 Cl* IC 2391 CTIO 114 * 08 42 21.5694948216 -52 53 38.709864348           ~ 2 1
35 V* HY Vel SB* 08 42 25.3862731 -53 06 50.343091 3.97 4.655 4.815     B3IV 163 0
36 Cl* IC 2391 PMM 4695 * 08 42 30.6875019960 -52 57 34.479920844   14.95 14.63 13.49 12.45 M1e 13 1
37 CPD-52 1614 SB* 08 42 46.6075101288 -53 01 01.341693984   10.7 10.3     ~ 30 0
38 CPD-52 1616 * 08 42.8 -53 02   11.92 11.29     ~ 3 0
39 VXR PSPC 53 X 08 42 48.8 -52 52 18           ~ 2 0
40 VXR PSPC 55 X 08 42 57.9 -53 06 04           ~ 2 0
41 HD 74678 * 08 43 03.4712449488 -53 04 40.685214540   7.73 7.65     A1V 43 0
42 Cl* IC 2391 PP 17 * 08 43 15.1304612040 -52 58 22.907000316     19.65     M5.5 12 0
43 IC 2602 OpC 10 42 27 -64 25.6           ~ 610 0
44 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4501 2

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2022.05.22-00:44:56

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