2006A&A...454..595G


Query : 2006A&A...454..595G

2006A&A...454..595G - Astronomy and Astrophysics, volume 454, 595-607 (2006/8-1)

X-ray emission from T Tauri stars in the Lupus 3 star-forming region.

GONDOIN P.

Abstract (from CDS):

In this paper, I present analysis results of an XMM-Newton observation of the Lupus 3 region that contains a high proportion of young low mass (M<0.3M) T Tauri stars in the Lupus star-forming complex. The detection of X-ray sources in 0.5 to 4.5keV images of the Lupus 3 core was performed using the standard source detection method of the XMM-Newton Science Analysis Software. The detected sources were correlated with a list of Herbig-Haro objects and Hα emission stars that contains mainly classical T Tauri stars, with a catalogue of weak-line T Tauri Stars and with a recent list of new low-mass members of the Lupus 3 dark cloud found in a visible-light spectroscopic survey at the center of the Lupus 3 star-forming core. The light curves and spectra of the brightest X-ray sources with known T Tauri star counterparts were analysed. One hundred and two X-ray sources were detected in the 30' diameter field-of-view of the EPIC cameras, of which 25 have visible or near-IR counterparts that are known as pre-main sequence stars. Their X-ray luminosity ranges from 3x1028 to 3x1030erg/s. Two of these objects with mass estimates lower than 0.075M have an X-ray luminosity of about 4-7x1028erg/s, comparable with that of flaring young brown dwarfs. A linear correlation is found between the X-ray luminosity and the mass or volume of the stars that is qualitatively expected from some models of distributed turbulent dynamos. The EPIC spectra of the X-ray brightest sources can be fitted using optically thin plasma emission models with two components at temperatures in the ranges 3-9x106K and 1-50x107K, respectively. The large emission measure of hot plasma may be caused by disruptions of magnetic fields associated with an intense flaring activity, while the X-ray emission from the ``cool'' plasma components may result from solar-type active regions. The emission measures of the plasma components are of the order of 1052cm–3, typical of the values expected from coronal plasmas in T Tauri stars, post-T Tauri stars, and active late-type dwarfs in close binary systems. One property of the X-ray brightest stars in Lupus 3 that seems common among pre-main sequence stars is the low abundance of Fe.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: atmospheres - stars: coronae - stars: evolution - stars: low-mass, brown dwarfs - stars: late-type

VizieR on-line data: <Available at CDS (J/A+A/454/595): table6.dat>

Nomenclature: Table 6: [G2006] NNN (Nos 1-102).

CDS comments: Paragraph 3.1. Bianco 1 is a probable misprint for Blanco 1.

Simbad objects: 122

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Number of rows : 122
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 Cl Blanco 1 OpC 00 03 24.7 -29 57 29           ~ 325 0
2 IC 348 OpC 03 44 31.7 +32 09 32           ~ 1392 1
3 Cl Melotte 22 OpC 03 46 24.2 +24 06 50           ~ 3431 0
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4412 0
5 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2329 0
6 IC 2391 OpC 08 41 10.1 -52 59 28           ~ 822 0
7 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 806 0
8 Lupus 1 Cld 15 43 02.1 -34 09 06           ~ 285 0
9 Lupus 2 MoC 15 57 08 -37 47.1           ~ 114 1
10 Lupus 4 MoC 16 03 12.4 -42 07 43           ~ 152 0
11 [G2006] 1 X 16 07 28.1 -39 06 35           ~ 1 0
12 [G2006] 2 X 16 07 34.6 -39 04 22           ~ 1 0
13 [G2006] 3 X 16 07 35.3 -39 05 49           ~ 1 0
14 [G2006] 4 X 16 07 43.7 -39 01 42           ~ 1 0
15 [G2006] 5 X 16 07 44.8 -39 00 55           ~ 1 0
16 [G2006] 6 X 16 07 46.2 -39 01 53           ~ 1 0
17 [G2006] 7 X 16 07 49.3 -39 02 03           ~ 1 0
18 Sz 94 TT* 16 07 49.5974149968 -39 04 28.760342844   16.31 16.00 14.76 12.90 ~ 32 0
19 [G2006] 9 X 16 07 49.9 -39 15 36           ~ 1 0
20 Sz 95 TT* 16 07 52.3109740056 -38 58 06.091698756   16.714 15.189 14.934 12.53 ~ 53 0
21 SONYC Lup3-3 LM* 16 07 55.1838796776 -39 06 03.793003452       18.83 16.06 M6.5 6 0
22 [G2006] 12 X 16 07 57.6 -39 02 40           ~ 1 0
23 RX J1608.0-3857 TT* 16 07 59.971704 -38 57 51.00912 15.16 14.276 12.830 12.503 10.819 ~ 15 0
24 [G2006] 14 X 16 08 00.3 -39 03 04           ~ 1 0
25 [G2006] 15 * 16 08 01.0621900416 -38 56 50.916936912           ~ 1 0
26 [G2006] 16 X 16 08 01.9 -39 12 32           ~ 2 0
27 [G2006] 17 * 16 08 02.2948960248 -39 08 31.485111576           ~ 1 0
28 [G2006] 18 X 16 08 03.0 -39 16 00           ~ 1 0
29 [G2006] 19 X 16 08 05.4 -39 02 18           ~ 1 0
30 [G2006] 20 X 16 08 06.1 -39 13 42           ~ 1 0
31 [G2006] 21 X 16 08 10.5 -39 00 24           ~ 1 0
32 2MASS J16081096-3910459 TT* 16 08 10.9590962904 -39 10 45.934592664 15.15 14.08 12.84 12.06 11.38 ~ 13 0
33 [G2006] 23 X 16 08 11.0 -39 05 13           ~ 1 0
34 Sz 96 TT* 16 08 12.6308620920 -39 08 33.470354256   14.80 13.43 13.69 11.84 ~ 79 0
35 [G2006] 25 X 16 08 14.0 -39 12 22           ~ 1 0
36 [G2006] 26 X 16 08 15.1 -39 16 58           ~ 1 0
37 SONYC Lup3-5 LM* 16 08 16.0404001440 -39 03 04.320708732   17.74 19.92 18.15 15.28 M7.5 26 0
38 [G2006] 27 X 16 08 16.1 -39 17 14           ~ 1 0
39 [G2006] 29 X 16 08 16.7 -39 16 05           ~ 1 0
40 UCAC3 102-194744 Y*O 16 08 17.3983005480 -39 01 06.179222856       15.21 13.31 ~ 7 0
41 [G2006] 31 X 16 08 17.4 -39 15 06           ~ 1 0
42 [G2006] 32 X 16 08 17.7 -38 55 56           ~ 1 0
43 [G2006] 33 X 16 08 17.9 -38 59 35           ~ 1 0
44 [G2006] 34 X 16 08 18.8 -39 16 58           ~ 1 0
45 [G2006] 35 X 16 08 19.4 -39 00 36           ~ 1 0
46 THA 15-24 Y*O 16 08 21.8037909864 -39 04 21.491863824   16.18 14.61 14.67 12.92 M3 58 0
47 V* V1279 Sco Or* 16 08 22.4935277520 -39 04 46.427612052   14.99 13.66 11.70 11.21 M0.4 119 1
48 2MASS J16082279-3900591 TT* 16 08 22.7935199352 -39 00 59.059019664     15.05 15.02 12.75 ~ 15 0
49 THA 15-25 Y*O 16 08 24.0422612880 -39 05 49.433170740   15.49 16.00 15.39 14.17 M3.5 49 0
50 [G2006] 38 X 16 08 24.9 -39 03 10           ~ 1 0
51 [G2006] 39 X 16 08 25.4 -39 02 52           ~ 1 0
52 [G2006] 40 X 16 08 25.7 -39 05 24           ~ 1 0
53 THA 15-26 Y*O 16 08 25.7633674272 -39 06 01.247043888   16.62 15.43 14.97 13.12 M5 66 0
54 [G2006] 42 X 16 08 27.0 -39 06 44           ~ 1 0
55 [G2006] 43 X 16 08 27.1 -39 01 44           ~ 1 0
56 V* V1093 Sco TT* 16 08 27.7818643128 -39 00 40.623399936     14.57 13.54 12.20 ~ 16 0
57 THA 15-27 Y*O 16 08 28.43136 -39 05 32.4312   17.03 15.46 14.00 12.35 M4 29 0
58 [G2006] 46 X 16 08 29.0 -39 09 24           ~ 1 0
59 [G2006] 47 X 16 08 29.4 -39 14 29           ~ 1 0
60 [G2006] 48 X 16 08 29.4 -39 08 01           ~ 1 0
61 [G2006] 49 X 16 08 29.7 -39 00 08           ~ 1 0
62 WRAY 16-203 Or* 16 08 29.7275063376 -39 03 11.024360496   16.26 15.91 15.38 15.69 K0: 170 1
63 THA 15-29 Y*O 16 08 30.2687378568 -39 06 11.176056000   14.8 11.14 15.18 13.15 M4 64 0
64 [G2006] 51 X 16 08 30.8 -38 59 29           ~ 1 0
65 THA 15-30 TT* 16 08 30.8142130416 -39 05 48.837746436   15.2 15.25 13.96 13.57 M5 61 0
66 [MJS2008] 52 Y*O 16 08 31.10 -38 56 00.0       21.60 20.74 ~ 11 0
67 [G2006] 53 X 16 08 31.8 -38 58 51           ~ 1 0
68 [G2006] 54 X 16 08 32.5 -38 58 26           ~ 1 0
69 [G2006] 55 X 16 08 33.2 -38 57 58           ~ 1 0
70 [G2006] 57 X 16 08 33.8 -39 00 10           ~ 1 0
71 [G2006] 58 X 16 08 34.1 -38 57 24           ~ 1 0
72 V* V856 Sco Ae* 16 08 34.2870044544 -39 06 18.325711332 7.66 7.41 7.05 6.92   A7IIIne_sh 388 0
73 V* V1027 Sco a2* 16 08 34.5616203192 -39 05 34.278268848   6.552 6.629 6.66   A0/3III 193 0
74 2MASS J16083547-3900358 ** 16 08 35.47512 -39 00 35.8416         13.88 M6.5 6 0
75 UCAC3 102-194847 Y*O 16 08 35.7826940376 -39 03 47.933557092   16.88 15.49 15.02 13.09 M6 28 0
76 [G2006] 61 X 16 08 35.8 -38 56 23           ~ 1 0
77 [G2006] 63 X 16 08 37.2 -38 55 36           ~ 1 0
78 2MASS J16083738-3858474 * 16 08 37.3864160880 -38 58 47.430331104           ~ 1 0
79 [G2006] 65 X 16 08 38.7 -38 54 39           ~ 1 0
80 [G2006] 66 X 16 08 39.1 -39 15 26           ~ 1 0
81 [G2006] 67 X 16 08 39.3 -38 54 09           ~ 1 0
82 [G2006] 68 X 16 08 39.7 -38 53 53           ~ 1 0
83 Sz 106 Y*O 16 08 39.7597402848 -39 06 25.321212288   15.1   15.00 14.66 M2.5 47 0
84 [G2006] 69 X 16 08 40.5 -39 15 52           ~ 1 0
85 [G2006] 70 X 16 08 40.6 -39 18 40           ~ 1 0
86 [G2006] 71 X 16 08 40.9 -38 53 10           ~ 1 0
87 [G2006] 72 X 16 08 41.6 -39 06 44           ~ 2 0
88 Sz 107 Y*O 16 08 41.7980924472 -39 01 37.038551232   17.31 16.06 15.42 13.20 M5.5 40 0
89 Sz 108 TT* 16 08 42.7394012688 -39 06 18.313411608   14.497 13.058 12.824 11.16 ~ 39 0
90 TYC 7851-1158-1 * 16 08 44.1429033480 -38 57 16.013672928   12.05 11.26     ~ 1 0
91 [G2006] 76 X 16 08 45.5 -38 55 31           ~ 1 0
92 [MJS2008] 61 Y*O 16 08 46.79 -39 02 07.4       22.28 21.04 ~ 7 0
93 V* V1191 Sco Or* 16 08 48.1612456128 -39 04 19.195145724   18.23 16.43 15.71 13.57 M6.5 22 0
94 [G2006] 79 X 16 08 48.5 -39 10 02           ~ 1 0
95 [G2006] 81 X 16 08 49.3909011480 -39 17 59.808742044           ~ 1 0
96 IRAS 16054-3857 Y*O 16 08 49.3987083072 -39 05 39.447341844   16.76 17.71 15.89 14.24 M4.5 53 0
97 [G2006] 82 * 16 08 49.6916979408 -39 01 22.509120036           ~ 2 0
98 V* V1192 Sco Or* 16 08 51.4348063536 -39 05 30.460358652     21.9 18.97 18.18 M5 72 0
99 V* V1193 Sco Or* 16 08 51.5693655096 -39 03 17.707587264   15.27 14.58 13.72 12.28 M4.5 70 0
100 [G2006] 84 X 16 08 51.8 -38 55 18           ~ 1 0
101 [G2006] 85 X 16 08 52.2 -39 12 11           ~ 1 0
102 UCAC3 102-194910 Y*O 16 08 53.2420957464 -39 14 40.160339952   17.53 16.35 15.35 13.52 M3 49 1
103 RX J1608.9-3905 TT* 16 08 54.2744987760 -39 06 05.799061764 12.57 11.91 10.88 10.28 9.74 ~ 24 0
104 Sz 112 Y*O 16 08 55.5289090032 -39 02 33.941081832   16.62 15.39 14.78 12.93 M6 67 0
105 THA 15-34 Y*O 16 08 57.8026653048 -39 02 22.853868252   17.46 16.50 16.64 14.65 M6 59 0
106 2MASS J16085953-3856275 Y*O 16 08 59.5395612120 -38 56 27.592929708       19.25 16.91 M8.5e 33 0
107 [G2006] 90 X 16 09 00.3 -39 18 33           ~ 1 0
108 [G2006] 91 X 16 09 00.9 -39 14 12           ~ 1 0
109 THA 15-35 Or* 16 09 01.8486544824 -39 05 12.414717240   15.33 14.12 14.35 12.54 M5.5 108 0
110 [G2006] 93 X 16 09 03.6 -38 58 53           ~ 1 0
111 Sz 115 TT* 16 09 06.2137580736 -39 08 51.873869400   16.88 15.48 15.09 13.12 ~ 50 0
112 2MASS J16090850-3903430 Y*O 16 09 08.5062297456 -39 03 43.080273612   18.00 16.60 16.43 14.16 ~ 14 0
113 [G2006] 96 X 16 09 10.6 -39 06 59           ~ 2 0
114 [G2006] 97 X 16 09 10.9 -39 13 42           ~ 1 0
115 [G2006] 98 X 16 09 11.0 -39 04 03           ~ 2 0
116 [G2006] 99 X 16 09 13.1 -39 12 55           ~ 1 0
117 [G2006] 100 X 16 09 13.7 -39 17 00           ~ 1 0
118 [G2006] 101 X 16 09 14.0 -39 15 29           ~ 1 0
119 Lupus 3 SFR 16 09.6 -39 03           ~ 323 0
120 [G2006] 102 PM* 16 09 36.8333440080 -39 01 45.470311320           ~ 2 0
121 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3625 1
122 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 490 0

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