2010A&A...524A..97L

Query : 2010A&A...524A..97L

2010A&A...524A..97L - Astronomy and Astrophysics, volume 524A97-97 (2010/12-1)

Deep XMM-Newton observation of the η Chamaleontis cluster.

LOPEZ-SANTIAGO J., ALBACETE COLOMBO J.F. and LOPEZ-GARCIA M.A.

Abstract (from CDS):

The members of the η Chamaleontis cluster are in an evolutionary stage in which disks are rapidly evolving. It also exhibits some peculiarities, such as the large fraction of binaries and accretion disks, probably related to the cluster formation process. Its proximity makes this stellar group an ideal target for studying the relation between X-ray emission and those stellar parameters. Our main objective is to determine the general X-ray properties of the cluster members in terms of coronal temperature, column density, emission measure, X-ray luminosity, and variability. We also aim to establish the relation between the X-ray luminosity of these stars and other stellar parameters, such as effective temperature, binarity, and the presence of accretion disks. Finally, a study of flare energies in each flare event detected during the observations and their relation with some stellar parameters is also performed. We used proprietary data from a deep XMM-Newton EPIC observation targeting the core of the η Chamaleontis cluster. Specific software for the reduction of XMM-Newton data was used to analyze our observation. To detect sources in the composed EPIC pn+mos image, we used the wavelet-based code PWDetect. General coronal properties were derived from plasma model fitting. X-ray light curves in the 0.3-8.0keV energy range were generated for each star. We determine both the coronal properties and variability of the η Chamaleontis members in the XMM-Newton EPIC field-of-view. A total of six flare-like events are clearly detected in five different stars. For them, we derived coronal properties during the flare events and pseudo-quiescent state separately. In our observations, stars that experienced a flare event have higher X-ray luminosities in the pseudo-quiescent state than cluster members of similar spectral type that exhibit no evidence of flaring independently of whether they have an accretion disk or not. Observed flare energies are typical of both pre-main- and main-sequence M stars. We detected no difference between flare energies of stars with and without an accretion disk.

Abstract Copyright: ∼

Journal keyword(s): open clusters and associations: individual: η Chamaleontis - stars: pre-main sequence - stars: coronae - stars: flare - X-ray: stars

VizieR on-line data: <Available at CDS (J/A+A/524/A97): tablea1.dat>

Nomenclature: Table A.1: [LAL2010] NN (Nos 1-86).

Simbad objects: 93

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Number of rows : 93
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 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
2 * sig Ori Y*O 05 38 44.7653828520 -02 36 00.283179888 2.54 3.58 3.79 3.87 4.11 O9.5V+B0.2V(n) 855 0
3 2MASS J08394669-7900026 AGN 08 39 46.6503446184 -79 00 03.089793276         18.34 ~ 1 0
4 [LAL2010] 68 X 08 39 47.4 -78 53 01           ~ 1 0
5 [LAL2010] 58 X 08 40 20.3 -78 54 42           ~ 1 0
6 [LAL2010] 28 X 08 40 24.1 -79 00 12           ~ 1 0
7 [LAL2010] 39 X 08 40 29.4 -78 58 41           ~ 1 0
8 [LAL2010] 26 X 08 40 32.8 -79 00 46           ~ 1 0
9 [LAL2010] 42 X 08 40 34.5 -78 58 31           ~ 1 0
10 [LAL2010] 5 X 08 40 53.4 -79 09 04           ~ 1 0
11 [LAL2010] 49 X 08 41 09.0 -78 56 01           ~ 1 0
12 [LAL2010] 57 X 08 41 20.2 -78 54 49           ~ 1 0
13 [LAL2010] 22 X 08 41 22.7 -79 02 33           ~ 1 0
14 [LAL2010] 73 X 08 41 26.1 -78 52 16           ~ 1 0
15 V* ES Cha Or* 08 41 30.3105474648 -78 53 06.477949932     17.07     M5.0 49 0
16 [LAL2010] 10 X 08 41 30.5 -79 05 03           ~ 1 0
17 [LAL2010] 35 X 08 41 36.3 -78 59 34           ~ 1 0
18 V* EH Cha Or* 08 41 37.0144539384 -79 03 30.535583220     14.4 14.011   M3.5 62 0
19 [LAL2010] 40 X 08 41 38.3 -78 58 41           ~ 1 0
20 [LAL2010] 25 X 08 41 39.9 -79 00 56           ~ 1 0
21 [LAL2010] 72 X 08 41 43.0 -78 52 43           ~ 1 0
22 HD 75505 * 08 41 44.7049093968 -79 02 53.258689068   7.55 7.38     A1V 57 0
23 [LAL2010] 8 X 08 42 10.8 -79 06 02           ~ 1 0
24 V* EI Cha Or* 08 42 23.7595500240 -79 04 02.976309552     12.7     M1.5 71 0
25 V* EK Cha Or* 08 42 27.0967343784 -78 57 47.910415932   16.659 15.153 14.893   M4.5 84 0
26 Cl Mamajek 1 OpC 08 42 32.9 -78 57 47           ~ 392 0
27 V* EL Cha TT* 08 42 38.7832034688 -78 54 42.736732812   15.540 14.081 13.778   M3.0 69 0
28 [LAL2010] 2 X 08 42 42.8 -79 10 59           ~ 1 0
29 [LAL2010] 13 X 08 42 49.6 -79 04 31           ~ 1 0
30 V* EM Cha Or* 08 43 07.2443828304 -79 04 52.483961064     10.8     K6.0 64 0
31 * 9 Cha SB* 08 43 12.1984130688 -79 04 12.368512452   6.28 6.07     A7V 242 0
32 [LAL2010] 63 X 08 43 13.7 -78 54 15           ~ 1 0
33 2MASS J08431595-7853422 * 08 43 15.9423452880 -78 53 42.300918672         16.03 ~ 1 0
34 [LAL2010] 15 X 08 43 18.0 -79 04 11           ~ 1 0
35 V* ET Cha Or* 08 43 18.5853516024 -79 05 18.232481832     13.97     M4.0 99 0
36 [LAL2010] 4 X 08 43 19.7 -79 09 50           ~ 1 0
37 [LAL2010] 36 X 08 43 20.7 -78 59 35           ~ 1 0
38 [LAL2010] 47 X 08 43 24.5 -78 56 46           ~ 1 0
39 [LAL2010] 23 X 08 43 31.6 -79 02 08           ~ 1 0
40 [LAL2010] 81 X 08 43 32.2 -78 48 13           ~ 1 0
41 [LAL2010] 67 X 08 43 33.4 -78 53 24           ~ 1 0
42 [LAL2010] 48 X 08 43 36.1 -78 56 33           ~ 1 0
43 [LAL2010] 43 X 08 43 36.7 -78 58 29           ~ 1 0
44 [LAL2010] 79 X 08 43 37.7 -78 48 25           ~ 1 0
45 [LAL2010] 52 X 08 43 39.0 -78 55 41           ~ 1 0
46 [LAL2010] 45 X 08 44 06.7 -78 57 53           ~ 1 0
47 [LAL2010] 3 X 08 44 07.3 -79 10 13           ~ 1 0
48 2MASS J08440921-7906156 * 08 44 09.2179486272 -79 06 15.627314592         16.55 ~ 1 0
49 V* EN Cha Or* 08 44 16.421808 -78 59 08.06316   16.425 14.967 14.688   M4.5 70 0
50 [LAL2010] 44 X 08 44 25.5 -78 58 19           ~ 1 0
51 [LAL2010] 64 X 08 44 29.9 -78 54 03           ~ 1 0
52 V* EO Cha Or* 08 44 31.8938144088 -78 46 31.143275076     12.531   10.646 M0e 83 0
53 [LAL2010] 51 X 08 44 42.3 -78 55 51           ~ 1 0
54 [LAL2010] 77 X 08 44 54.2 -78 48 37           ~ 1 0
55 [LAL2010] 41 X 08 44 54.4 -78 58 39           ~ 1 0
56 [LAL2010] 80 X 08 44 59.8 -78 48 16           ~ 1 0
57 [LAL2010] 61 X 08 45 01.9 -78 54 40           ~ 1 0
58 [LAL2010] 78 X 08 45 04.5 -78 48 28           ~ 1 0
59 [LAL2010] 31 X 08 45 05.3 -79 00 09           ~ 1 0
60 [LAL2010] 70 X 08 45 08.9 -78 53 03           ~ 1 0
61 [LAL2010] 21 X 08 45 13.8 -79 02 37           ~ 1 0
62 UCAC2 411031 * 08 45 18.4542004944 -78 54 42.603251328       14.57 13.90 ~ 1 0
63 [LAL2010] 76 X 08 45 18.5 -78 49 41           ~ 1 0
64 [LAL2010] 60 X 08 45 19.6 -78 54 44           ~ 1 0
65 [LAL2010] 84 X 08 45 23.7 -78 47 24           ~ 1 0
66 [LAL2010] 86 X 08 45 27.8 -78 45 45           ~ 1 0
67 [LAL2010] 1 X 08 45 33.9 -79 13 33           ~ 1 0
68 [LAL2010] 53 X 08 45 36.0 -78 55 36           ~ 1 0
69 [LAL2010] 71 X 08 45 39.8 -78 52 58           ~ 1 0
70 [LAL2010] 6 X 08 45 42.3 -79 07 12           ~ 1 0
71 [LAL2010] 20 X 08 45 47.8 -79 02 38           ~ 1 0
72 [LAL2010] 19 X 08 45 50.4 -79 02 58           ~ 1 0
73 [LAL2010] 82 X 08 45 53.2 -78 47 59           ~ 1 0
74 HD 76144 * 08 46 01.9872657360 -78 51 36.390624156   9.64 9.05     G0IV/V 13 0
75 [LAL2010] 32 X 08 46 02.6 -79 00 01           ~ 1 0
76 [LAL2010] 83 X 08 46 14.0 -78 47 39           ~ 1 0
77 [LAL2010] 33 X 08 46 20.8 -78 59 58           ~ 1 0
78 [LAL2010] 27 X 08 46 55.5 -79 00 18           ~ 1 0
79 [LAL2010] 38 X 08 46 56.9 -78 58 55           ~ 1 0
80 V* EP Cha Or* 08 47 01.6439909496 -78 59 34.380161016     11.1     K5IVe 109 0
81 [LAL2010] 29 X 08 47 01.8 -79 00 11           ~ 1 0
82 [LAL2010] 17 X 08 47 15.0 -79 03 55           ~ 1 0
83 [LAL2010] 74 X 08 47 39.1 -78 50 36           ~ 1 0
84 [LAL2010] 75 X 08 47 52.1 -78 50 10           ~ 1 0
85 [LAL2010] 62 X 08 47 52.2 -78 54 16           ~ 1 0
86 V* EQ Cha TT* 08 47 56.7585043512 -78 54 53.185560516   14.777 13.308 12.802 10.795 M3 88 0
87 [LAL2010] 54 X 08 48 01.1 -78 55 20           ~ 1 0
88 [LAL2010] 24 X 08 48 10.6 -79 01 06           ~ 1 0
89 DENIS J084834.9-785352 PM* 08 48 34.8706100901 -78 53 51.359088465   18.5 17.81 16.7 14.07 M5e 8 0
90 [LAL2010] 56 X 08 48 35.9 -78 54 50           ~ 1 0
91 [LAL2010] 50 X 08 49 01.1 -78 55 52           ~ 1 0
92 [LAL2010] 11 X 08 49 20.9 -79 04 51           ~ 1 0
93 NAME TW Hya Association As* 11 01.9 -34 42           ~ 1018 0

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