2009A&A...502..579C

Query : 2009A&A...502..579C

2009A&A...502..579C - Astronomy and Astrophysics, volume 502579-597 (2009/8-1)

First detection of acceleration and deceleration in protostellar jets? time variability in the Chamaeleontis II outflows.

CARATTI O GARATTI A., EISLOEFFEL J., FROEBRICH D., NISINI B., GIANNINI T. and CALZOLETTI L.

Abstract (from CDS):

Kinematical and time variability studies of protostellar jets are fundamental for understanding the dynamics and the physics of these objects. Such studies remain very sporadic, since they require long baselines before they can be accomplished. We present for the first time a multi-epoch (20 years baseline) kinematical investigation of HH52, 53, and 54 at optical and near-IR wavelengths, along with medium (optical) and high resolution (NIR) spectroscopic analyses, probing the kinematical and physical time variability conditions of the gas along the flows. By means of multi-epoch and multi-wavelength narrow-band images, we derived proper motions (PMs), tangential velocities, velocity and flux variability of the knots. Radial velocities and physical parameters of the gas were derived from spectroscopy. Finally, spatial velocities and inclination of the flows were obtained by combining both imaging and spectroscopy. The PM analysis reveals three distinct, partially overlapping outflows. Spatial velocities of the knots vary from 50km/s to 120km/s. The inclinations of the three flows are 58±3°, 84±2°, and 67±3° (HH52, HH53, and HH54 flows, respectively). In 20 years, about 60% of the observed knots show some degree of flux variability. Our set of observations apparently indicates acceleration and deceleration in a variety of knots along the jets. For about 20% of the knots, mostly coincident with working surfaces or interacting knots along the flows, a relevant variability in both flux and velocity is observed. We argue that both variabilities are related and that all or part of the kinetic energy lost by the interacting knots is successively radiated. The physical parameters derived from the diagnostics are quite homogeneous along and among the three outflows. The analysis indicates the presence of very light (NH∼103cm–3), ionised (Xe∼0.2-0.6), and hot (Te∼14000-26000K) flows, impacting a denser medium. Several knots are deflected, especially in the HH52 flow. At least for a couple of them (HH54 G and G0), the deflection originates from the collision of the two. For the more massive parts of the flow, the deflection is likely the result of the flow collision with a dense cloud or with clumps. Finally, we discuss the possible driving sources of the flows.

Abstract Copyright: ∼

Journal keyword(s): stars: pre-main sequence - ISM: jets and outflows - ISM: Herbig-Haro objects - ISM: kinematics and dynamics

Simbad objects: 131

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Number of rows : 131
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 HH 110 HH 05 51 24.929 +02 54 52.28           ~ 92 0
2 HH 219 HH 08 22 54.044 -42 08 47.19           ~ 9 1
3 NAME HH 46-47 HH 08 25 43.6 -51 00 36           ~ 216 2
4 CD-32 5613 WD* 08 41 32.4290850497 -32 56 32.915823461   12.07 11.85 12.3   DA5.5 325 0
5 V* AX Cha Mi* 12 45 06.2856573984 -77 20 13.642917324           M2.5 14 0
6 IRAS 12448-7650 LP? 12 48 25.7049616224 -77 06 36.747495432   17.25 15.14 14.33   M0.5 19 0
7 IRAS Z12488-7658 LP* 12 52 30.6218360736 -77 15 13.123459980           M5.5 13 0
8 V* DK Cha TT* 12 53 17.2111480272 -77 07 10.736046012           F0e 149 0
9 NAME Cha II MoC 12 54 -77.2           ~ 361 0
10 2MASS J12533890-7715532 Y*O 12 53 38.9146387776 -77 15 53.247287808           M1.5 12 1
11 HH 52B6 HH 12 55 02.2 -76 57 55           ~ 1 0
12 HH 52B8 HH 12 55 02.4 -76 57 57           ~ 1 0
13 HH 52B5 HH 12 55 02.9 -76 57 58           ~ 1 0
14 HH 52B4 HH 12 55 03.0 -76 57 57           ~ 1 0
15 HH 52B7 HH 12 55 03.4 -76 58 00           ~ 1 0
16 HH 52B9 HH 12 55 03.6 -76 57 57           ~ 1 0
17 HH 52B3 HH 12 55 04.6 -76 57 54           ~ 1 0
18 HH 52C6 HH 12 55 05.3 -76 58 01           ~ 1 0
19 HH 52B2 HH 12 55 05.3 -76 57 53           ~ 1 0
20 HH 52C1 HH 12 55 05.4 -76 58 01           ~ 1 0
21 HH 52C2 HH 12 55 05.5 -76 57 58           ~ 1 0
22 HH 52B1 HH 12 55 05.6 -76 57 54           ~ 1 0
23 HH 52C3 HH 12 55 06.2 -76 57 59           ~ 1 0
24 HH 52 HH 12 55 06.4 -76 57 46           ~ 38 0
25 HH 53 HH 12 55 06.4 -76 57 46           ~ 36 0
26 HH 52C4 HH 12 55 06.7 -76 57 58           ~ 1 0
27 HH 52A3 HH 12 55 06.7 -76 57 55           ~ 1 0
28 HH 52A2 HH 12 55 06.7 -76 57 52           ~ 1 0
29 HH 52D5 HH 12 55 06.7 -76 57 43           ~ 1 0
30 HH 52A4 HH 12 55 07.4 -76 57 54           ~ 1 0
31 HH 52A1 HH 12 55 07.6 -76 57 52           ~ 1 0
32 HH 52C5 HH 12 55 08.0 -76 58 01           ~ 1 0
33 HH 52A5 HH 12 55 09.1 -76 57 54           ~ 1 0
34 HH 52A6 HH 12 55 09.5 -76 57 52           ~ 1 0
35 HH 52D4 HH 12 55 10.0 -76 57 46           ~ 1 0
36 HH 52D3 HH 12 55 12.1 -76 57 49           ~ 1 0
37 HH 52D2 HH 12 55 12.8 -76 57 49           ~ 1 0
38 HH 53I HH 12 55 13.1 -76 57 34           ~ 1 0
39 HH 53B1 HH 12 55 13.6 -76 57 31           ~ 1 0
40 HH 52D1 HH 12 55 13.9 -76 57 47           ~ 1 0
41 HH 53B2 HH 12 55 14.1 -76 57 31           ~ 1 0
42 HH 53B HH 12 55 14.89 -76 57 27.9           ~ 3 0
43 HH 53H HH 12 55 15.4 -76 57 25           ~ 1 0
44 HH 53A HH 12 55 15.91 -76 57 27.5           ~ 4 0
45 HH 53C1 HH 12 55 16.1 -76 57 30           ~ 1 0
46 HH 53C HH 12 55 16.4 -76 57 27           ~ 2 0
47 HH 53E HH 12 55 19.4 -76 57 21           ~ 1 0
48 HH 53E1 HH 12 55 19.9 -76 57 24           ~ 1 0
49 HH 53F2 HH 12 55 22.1 -76 57 28           ~ 1 0
50 HH 53F HH 12 55 23.0 -76 57 23           ~ 1 0
51 HH 53F1 HH 12 55 24.6 -76 57 20           ~ 1 0
52 HH 53G HH 12 55 30.3 -76 57 11           ~ 1 0
53 HH 54X3 HH 12 55 39.8 -76 57 36           ~ 1 0
54 HH 54X0 HH 12 55 40.3 -76 57 50           ~ 1 0
55 HH 54X4A HH 12 55 40.5 -76 57 28           ~ 1 0
56 HH 54X HH 12 55 40.51 -76 57 35.3           ~ 5 0
57 HH 54X2A HH 12 55 40.7 -76 57 42           ~ 1 0
58 HH 54X2B HH 12 55 41.3 -76 57 39           ~ 1 0
59 HH 54X1C HH 12 55 41.6 -76 57 35           ~ 1 0
60 HH 54T HH 12 55 41.6 -76 57 34           ~ 1 0
61 HH 54X4C HH 12 55 41.8 -76 57 25           ~ 1 0
62 HH 54X4B HH 12 55 42.0 -76 57 22           ~ 1 0
63 HH 54X1B HH 12 55 42.8 -76 57 36           ~ 1 0
64 HH 54Y3 HH 12 55 43.2 -76 57 13           ~ 1 0
65 HH 54X1D HH 12 55 43.8 -76 57 27           ~ 1 0
66 HH 54Y HH 12 55 44.2 -76 57 14           ~ 4 0
67 HH 54X1A HH 12 55 44.6 -76 57 35           ~ 1 0
68 HH 54Y2 HH 12 55 44.7 -76 57 06           ~ 1 0
69 HH 54G0 HH 12 55 44.8 -76 56 13           ~ 1 0
70 HH 54Y1 HH 12 55 44.9 -76 57 11           ~ 1 0
71 HH 54Y4 HH 12 55 45.0 -76 57 00           ~ 1 0
72 HH 54P HH 12 55 45.2 -76 56 34           ~ 1 0
73 HH 54Y8 HH 12 55 45.3 -76 57 09           ~ 1 0
74 HH 54G HH 12 55 45.5 -76 56 10           ~ 3 0
75 HH 54Y6 HH 12 55 45.5 -76 56 53           ~ 1 0
76 HH 54Y7 HH 12 55 46.1 -76 57 00           ~ 1 0
77 HH 54Z1 HH 12 55 46.1 -76 56 45           ~ 1 0
78 HH 54O1 HH 12 55 46.7 -76 56 24           ~ 1 0
79 HH 54Q1 HH 12 55 47.2 -76 56 43           ~ 1 0
80 HH 54Z HH 12 55 47.2 -76 56 43           ~ 1 0
81 HH 54G1 HH 12 55 47.3 -76 56 09           ~ 1 0
82 HH 54A5 HH 12 55 47.4 -76 56 30           ~ 1 0
83 HH 54O HH 12 55 47.4 -76 56 22           ~ 1 0
84 HH 54G2 HH 12 55 47.6 -76 56 05           ~ 1 0
85 HH 54A4 HH 12 55 47.7 -76 56 33           ~ 1 0
86 HH 54A6 HH 12 55 48.1 -76 56 31           ~ 1 0
87 HH 54F1 HH 12 55 48.4 -76 56 17           ~ 1 0
88 HH 54A3 HH 12 55 48.7 -76 56 33           ~ 1 0
89 HH 54A8 HH 12 55 48.7 -76 56 29           ~ 1 0
90 HH 54N HH 12 55 48.8 -76 56 23           ~ 1 0
91 HH 54A HH 12 55 49 -76 56.4           ~ 10 0
92 HH 54Y5 HH 12 55 49.1 -76 57 04           ~ 1 0
93 HH 54F HH 12 55 49.1 -76 56 16           ~ 3 0
94 HH 54G3 HH 12 55 49.1 -76 56 06           ~ 1 0
95 HH 54A7 HH 12 55 49.4 -76 56 32           ~ 1 0
96 HH 54A1 HH 12 55 49.4 -76 56 30           ~ 1 0
97 HH 54 HH 12 55 49.5 -76 56 08           ~ 119 0
98 HH 54B2 HH 12 55 49.8 -76 56 21           ~ 1 0
99 HH 54A2 HH 12 55 50.2 -76 56 30           ~ 1 0
100 HH 54M1 HH 12 55 50.2 -76 56 11           ~ 1 0
101 HH 54B HH 12 55 50.3 -76 56 23           ~ 30 0
102 HH 54C HH 12 55 50.4 -76 56 05           ~ 13 0
103 HH 54B3 HH 12 55 50.5 -76 56 24           ~ 1 0
104 HH 54B1 HH 12 55 50.6 -76 56 19           ~ 1 0
105 HH 54C3 HH 12 55 51.0 -76 56 02           ~ 1 0
106 HH 54Q3 HH 12 55 51.3 -76 56 36           ~ 1 0
107 HH 54J1 HH 12 55 51.4 -76 56 16           ~ 1 0
108 HH 54M HH 12 55 51.50 -76 56 10.5           ~ 3 0
109 HH 54Q2 HH 12 55 51.8 -76 56 40           ~ 1 0
110 HH 54C2 HH 12 55 52 -75 56.1           ~ 4 0
111 HH 54J HH 12 55 52.1 -76 56 15           ~ 3 0
112 HH 54H3 HH 12 55 52.4 -76 56 10           ~ 1 0
113 HH 54H HH 12 55 52.4 -76 56 04           ~ 2 0
114 HH 54H1 HH 12 55 52.8 -76 56 05           ~ 1 0
115 HH 54C1 HH 12 55 53 -76 56.1           ~ 4 0
116 HH 54H2 HH 12 55 53.1 -76 56 07           ~ 2 0
117 HH 54K2 HH 12 55 53.3 -76 56 24           ~ 1 0
118 HH 54K HH 12 55 53.5 -76 56 22           ~ 11 0
119 HH 54E HH 12 55 53.6 -76 56 20           ~ 14 0
120 HH 54I HH 12 55 54.0 -76 56 06           ~ 3 0
121 HH 54K1 HH 12 55 54.1 -76 56 27           ~ 1 0
122 HH 54R HH 12 55 56.3 -76 57 20           ~ 1 0
123 CD-44 12736 PM* 18 36 25.9502475648 -44 18 36.907592904   10.83 10.22     G0 222 0
124 HH 54X1 HH ~ ~           ~ 1 0
125 HH 54X4 HH ~ ~           ~ 1 0
126 HH 52B HH ~ ~           ~ 1 0
127 HH 52E HH ~ ~           ~ 1 0
128 HH 52C HH ~ ~           ~ 1 0
129 HH 52A HH ~ ~           ~ 1 0
130 HH 52F HH ~ ~           ~ 1 0
131 HH 52G HH ~ ~           ~ 1 0

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