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


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.12CET10:57:15

2010A&A...524A..97L - Astronomy and Astrophysics, volume 524, A97-97 (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 - 2020
#notes
1 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3318 0
2 * sig Ori Y*O 05 38 44.7665260139 -02 36 00.284709290 2.54 3.58 3.79 3.87 4.11 O9.5V 731 0
3 2MASS J08394669-7900026 AGN 08 39 46.691 -79 00 02.69         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 30.3121430855 -78 53 06.481203533     17.07     M4 35 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 37.0153250643 -79 03 30.542210498     14.4     M3 45 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 44.7054612559 -79 02 53.257480165   7.55 7.38     A1V 42 0
23 NAME eta Cha Association MGr 08 42 06 -79 01.6           ~ 299 0
24 [LAL2010] 8 X 08 42 10.8 -79 06 02           ~ 1 0
25 V* EI Cha Or* 08 42 23.7597511980 -79 04 02.974504684     12.7     K7 49 0
26 V* EK Cha Or* 08 42 27.0970495336 -78 57 47.916541725     15.2     M5 63 0
27 V* EL Cha Or* 08 42 38.7835569558 -78 54 42.736779291     14.1     M2 44 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 07.2443800909 -79 04 52.482213897     10.8     K3 49 0
31 * 9 Cha Al* 08 43 12.1978606956 -79 04 12.366179858   6.28 6.07     A7V 204 0
32 [LAL2010] 63 X 08 43 13.7 -78 54 15           ~ 1 0
33 2MASS J08431595-7853422 * 08 43 15.9412599752 -78 53 42.296833516         16.03 ~ 1 0
34 [LAL2010] 15 X 08 43 18.0 -79 04 11           ~ 1 0
35 V* ET Cha Or* 08 43 18.5820197784 -79 05 18.203801931     13.97     M2 67 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 09.2172997853 -79 06 15.629136879         16.55 ~ 1 0
49 V* EN Cha Or* 08 44 16.2413047260 -78 59 07.640832807     15.0     M4 54 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 31.8938598641 -78 46 31.142380687     12.531   10.646 M0 60 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 18.4539931478 -78 54 42.604358681       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 01.9887986968 -78 51 36.365154476   9.64 9.05     G0IV/V 6 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 01.6438574841 -78 59 34.378576588     11.1     K5 71 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 Or* 08 47 56.7571398344 -78 54 53.189801719     13.275   10.795 M3 66 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 34.8698220327 -78 53 51.357659791   18.5 17.81 16.7 14.07 M5V 4 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           ~ 795 0

    Equat.    Gal    SGal    Ecl

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2019.11.12-10:57:15

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