2005A&A...430..155P


Query : 2005A&A...430..155P

2005A&A...430..155P - Astronomy and Astrophysics, volume 430, 155-164 (2005/1-4)

XMM-Newton observation of the young open cluster Blanco 1. II. X-ray time variability and flares.

PILLITTERI I., MICELA G., REALE F. and SCIORTINO S.

Abstract (from CDS):

We study the X-ray variability of the young open cluster Blanco1 observed with the EPIC camera on board the XMM-Newton X-ray observatory. The time coverage of EPIC observations has allowed us to address short time scale (hours) variability, while the comparison with previous ROSAT observations has allowed us to investigate the variability on time scale of six years. On the time scale of hours, dM stars of the cluster are more variable than solar-mass stars. The main features of X-ray light curves in dM stars appear to be essentially flare-like events with a typical duration of the order of a few ks, while dF-dG stars show smooth variations. Two intense flares were observed in the ZS76 cluster member. From the analysis of the light curves and of the time resolved X-ray spectroscopy we infer that they occurred in arcades, made of several similar coronal loops (∼1010cm long), ignited at ∼15ks time delay. Minor heat pulses may occur in the first flare. The similarity of the two flares and of the flaring inferred structures may suggest that the flares are physically connected to each other. Amplitude variations on the time scale of 6 years are smaller by a factor 2, whereas a factor of 10 is observed on the Sun in the same band. This implies a smaller amplitude of any analog of the 11-yr cycle in these young active coronae.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: activity - stars: flare - Galaxy: open clusters and associations: individual: Blanco 1

Simbad objects: 29

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Number of rows : 29
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 [PMS2004] P3 X 00 01 54.5 -30 10 38           ~ 2 0
2 [PMS2004] Opt 48 * 00 02 07.6726930848 -30 04 42.628245528     16.89     ~ 9 0
3 [PMS2004] Opt 83 * 00 02 09.4940246088 -30 00 34.985319768     19.88     ~ 3 0
4 Cl* Blanco 1 ZS 45 * 00 02 18.5541763032 -29 51 08.453919708   13.6 12.87     ~ 16 0
5 [PMS2004] Opt 154 * 00 02 18.9344781720 -29 53 17.260705428     20.23     ~ 3 0
6 2MASS J00022589-2952392 * 00 02 25.8935942808 -29 52 39.227350188     16.44     M3-4V 12 0
7 Cl* Blanco 1 ZS 61 * 00 02 34.8274502088 -30 05 25.543689936   14.44 13.80     K5-7V 12 0
8 [PMS2004] Opt 26 * 00 02 39.3743406192 -30 08 03.919765956     18.78     ~ 8 0
9 2MASS J00024841-2953539 EB* 00 02 48.4315088952 -29 53 53.947671288     17.46     ~ 7 0
10 [PMS2003] J000252.2-294700.9 * 00 02 52.1890617912 -29 47 01.013128368     18.10     ~ 8 0
11 Cl* Blanco 1 ZS 76 SB* 00 02 56.3891922408 -30 04 44.872672188   12.98 12.32     ~ 22 0
12 Cl* Blanco 1 ZS 75 * 00 03 00.2764601520 -30 03 21.624708168   13.73 12.89     K4-7V 14 0
13 BlX 31 * 00 03 00.6666026880 -29 49 42.164709276     18.09     ~ 8 0
14 2MASS J00031154-2958103 * 00 03 11.5488876960 -29 58 10.390667556     18.51     M4-5V 11 0
15 Cl* Blanco 1 ZS 95 * 00 03 16.4934713400 -29 58 47.436654252   13.26 12.40     ~ 16 0
16 CD-30 19801 SB* 00 03 21.8528903616 -30 01 10.528822956   10.75 10.36     F3V 23 0
17 BlX 42 * 00 03 22.7608865832 -29 53 50.662865616     16.62     M3-4V 7 0
18 Cl* Blanco 1 ZS 94 * 00 03 24.1865402592 -29 56 22.965110448   15.85 14.95     K7-M0V 15 0
19 Cl Blanco 1 OpC 00 03 25 -29 57.5           ~ 276 0
20 [PMS2004] Opt 29 X 00 03 28.3 -30 07 45           ~ 2 0
21 BlX 45 * 00 03 29.9139307632 -30 01 20.468386920     18.02     ~ 8 0
22 2MASS J00033454-2958306 * 00 03 34.5451804152 -29 58 30.731276532     17.84     ~ 9 0
23 * bet Per EB* 03 08 10.1324535 +40 57 20.328013 1.70 2.07 2.12 2.08 2.11 B8V 1180 2
24 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3183 0
25 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2843 0
26 V* AB Dor TT* 05 28 44.8712165880 -65 26 55.199147208 8.259 7.856 6.999 6.496 5.993 K0V 975 0
27 NGC 2516 OpC 07 58 06 -60 48.0           ~ 645 0
28 IC 2391 OpC 08 41 10 -52 59.5           ~ 766 0
29 V* V370 Vel BY* 08 42 14.7556955232 -52 56 02.325566004   11.775 10.827 10.541 9.620 G9V 34 0

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2022.05.22-01:33:59

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