2000A&A...355..629A


Query : 2000A&A...355..629A

2000A&A...355..629A - Astronomy and Astrophysics, volume 355, 629-638 (2000/3-2)

A ROSAT pointed observation of the Chamaeleon II dark cloud.

ALCALA J.M., COVINO E., STERZIK M.F., SCHMITT J.H.M.M., KRAUTTER J. and NEUHAEUSER R.

Abstract (from CDS):

A deep 13.5ksec ROSAT PSPC pointed observation in the Chamaeleon II (Cha II) cloud is reported. 40 X-ray sources are detected of which 14 can be identified with previously known young stellar objects (YSOs), namely IRAS sources, classical T Tauri stars and weak T Tauri stars. From spectroscopic follow-up observations, four new weak T Tauri candidates have been found. The X-ray sources are mainly located on the north-east of the cloud and their spatial distribution follows the lanes of the 100µm dust emission. Their X-ray properties are similar to those of low-mass PMS stars. None of the protostar candidates in Cha II has been detected in the ROSAT pointed observation, in agreement with the ASCA observations results. The X-ray detection rates indicate that the weak T Tauri stars (WTTS) are less numerous than the classical T Tauri stars (CTTS), contrarily to the findings in Chamaeleon I (Cha I) and other star forming regions where the WTTS may outnumber the CTTS. The latter result could be a consequence of the fact that Cha II is in an earlier evolutionary stage as compared to Cha I, as conjectured by previous studies. The Cha II young stellar objects (YSOs) are, on the average, slightly less X-ray luminous than those in Cha I, but the normalised X-ray luminosity distribution functions of the two regions are not significantly different.

Abstract Copyright:

Journal keyword(s): surveys - stars: formation - stars: low-mass - stars: pre-main sequence - ISM: individual objects: Chamaeleon clouds - X-rays: stars

Nomenclature: Table 1: CHIIXR NN (Nos 1-40).

Simbad objects: 89

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Number of rows : 89
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 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1324 1
2 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1058 1
3 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 739 0
4 IRAS 12340-7958 LP? 12 37 39.7408011816 -80 15 13.707391932   16.11 14.39 13.63 9.81 ~ 106 0
5 NAME Cha III MoC 12 37.8 -80 15           ~ 134 2
6 V* DK Cha Or* 12 53 17.2111480272 -77 07 10.736046012           F0 136 0
7 NAME Cha II MoC 12 54 -77.2           ~ 313 0
8 2MASS J12533890-7715532 Y*O 12 53 38.9146387776 -77 15 53.247287808           M1.5 12 1
9 IRAS 12506-7730 FIR 12 54 22.4 -77 47 08           ~ 1 0
10 [VCE2001] C22 * 12 54 37.3181971872 -76 47 50.857916604           ~ 3 0
11 IRAS 12510-7718 FIR 12 54 46.6 -77 34 50           ~ 1 0
12 SSTc2d J125552.5-765616 Y*O 12 55 52.70 -76 56 16.0           ~ 14 0
13 NAME Sz 46N Em* 12 56 33.6498681600 -76 45 45.520705728   17.66 16.19 14.61 13.16 M1 26 1
14 Sz 47 Y*O 12 56 58.6633997016 -76 47 06.861163092   14.5       ~ 19 0
15 2MASS J12570041-7648347 * 12 57 00.42 -76 48 34.7           ~ 10 0
16 IRAS 12535-7623 Y*O 12 57 11.6949853032 -76 40 11.291754000   17.20 15.00     M0e 39 0
17 IRAS 12539-7627 * 12 57 31.5486477672 -76 43 04.633148532           ~ 3 0
18 IRAS 12551-7657 FIR 12 58 52.6 -77 13 32           ~ 2 0
19 2MASS J12590656-7707401 Y*O 12 59 06.56 -77 07 40.1           K4.5 47 0
20 2MASS J12591013-7712139 Y*O 12 59 10.1600323896 -77 12 13.864063428           M0 13 0
21 IRAS 12554-7635 FIR 12 59 13.4 -76 51 11           ~ 7 1
22 2MASS J12591580-7654457 * 12 59 15.8227225272 -76 54 45.696513600           ~ 5 0
23 UCAC3 25-31227 Y*O 12 59 26.3852196576 -77 47 08.619604404   15.039 13.136 12.748   M5 22 0
24 RX J1259.5-7637 X 12 59 31.1 -76 37 18           ~ 3 0
25 RX J1300.1-7659 X 13 00 03.1 -76 59 01           ~ 1 0
26 RX J1300.2-7748 X 13 00 10.4 -77 48 07           ~ 1 0
27 Sz 49 Y*O 13 00 53.2473650928 -76 54 15.206649912   15.6       M0.5 41 0
28 RX J1300.9-7708 Y*O 13 00 53.46120 -77 09 08.6580           M1 23 0
29 Sz 50 Y*O 13 00 55.3820751133 -77 10 22.247668674   17.64 16.01     M3 42 0
30 IRAS 12571-7654 IR 13 00 57.5 -77 10 47           ~ 6 0
31 2MASS J13005927-7714027 Y*O 13 00 59.2811230320 -77 14 02.848183656         16.26 ~ 23 0
32 RX J1301.9-7706 TT* 13 01 50.2 -77 06 00           K1 1 0
33 Sz 51 Or* 13 01 58.8991295760 -77 51 21.848767020   15.38       K8.5 38 0
34 RX J1302.0-7650 X 13 01 59.5 -76 50 19           ~ 2 0
35 IRAS 12583-7634 FIR 13 02 07.2 -76 51 07           ~ 2 0
36 V* CM Cha TT* 13 02 13.5244979592 -76 37 57.818696016   14.70 13.40     K7IVe 37 0
37 RX J1302.6-7719 X 13 02 38.0 -77 19 19           ~ 1 0
38 CHIIXR 15 * 13 02 42.2941147392 -77 11 11.370953760           ~ 2 0
39 IRAS 12589-7646 Y*O 13 02 47.7032642640 -77 02 39.973174116       13.75 9.98 M4 14 0
40 UCAC3 26-31797 * 13 02 49.1919194064 -77 05 44.793266892           ~ 3 0
41 RX J1303.0-7715 X 13 02 57.5 -77 15 14           ~ 3 0
42 IRAS 12591-7719 FIR 13 03 03.4 -77 35 16           ~ 1 0
43 2MASS J13030444-7707027 TT* 13 03 04.4591495760 -77 07 02.759053872     13.23     M0 16 1
44 UCAC3 26-31820 * 13 03 09.0139400688 -77 00 32.944283676           ~ 3 0
45 IRAS 12594-7707 FIR 13 03 16.5 -77 23 39           ~ 1 0
46 RX J1303.3-7705 X 13 03 18.3 -77 05 17           ~ 1 0
47 RX J1303.4-7650 X 13 03 22.0 -76 50 46           ~ 1 0
48 CHIIXR 22 * 13 03 23.9122247736 -77 16 37.278403464           ~ 2 0
49 CHIIXR 23 * 13 03 30.5624532576 -76 44 51.537574932           ~ 2 0
50 HD 113074 * 13 03 30.9382746912 -77 01 53.775816240   9.55 9.40 9.81   B9V 15 0
51 RX J1303.7-7717 X 13 03 42.0 -77 17 58           ~ 1 0
52 RX J1304.3-7716 X 13 04 15.5 -77 16 05           ~ 1 0
53 Hn 22 Y*O 13 04 22.8528353784 -76 50 05.477354844           M2e 15 0
54 IRAS 13005-7633 mul 13 04 23.96 -76 50 02.0           ~ 11 0
55 Hn 23 Y*O 13 04 24.1091476992 -76 50 01.203848088           K7e 22 0
56 Sz 52 Y*O 13 04 24.8675032320 -77 52 30.280923336   17.7     14.66 M2.5 26 0
57 HD 113696 * 13 04 39.9944582400 +53 51 27.317498544   8.65 7.34     K2 9 0
58 RX J1304.9-7658 X 13 04 54.0 -76 58 47           ~ 1 0
59 Hn 24 Y*O 13 04 55.7191411392 -77 39 49.222352340           M0 27 0
60 V* BE Cha EB* 13 04 58.9849560216 -76 56 49.082692020       13.75 12.65 ~ 4 0
61 Hn 25 Y*O 13 05 08.5232959920 -77 33 42.630661188           M2.5 19 0
62 Sz 53 Y*O 13 05 12.6752612232 -77 30 52.566390396   17.85 16.59     M1 26 0
63 RX J1305.3-7632 X 13 05 17.3 -76 32 44           ~ 1 0
64 Hen 3-854 Or* 13 05 20.6574078672 -77 39 01.506188880   13.88 12.40     K5 42 0
65 RX J1305.5-7655 X 13 05 29.4 -76 55 31           ~ 1 0
66 Sz 55 Y*O 13 06 30.5147352624 -77 34 00.166145700   18.90 17.49     M2 17 0
67 Sz 56 Y*O 13 06 38.7881087232 -77 30 35.274308688   18.53 17.08     M4 19 0
68 RX J1306.8-7752 X 13 06 45.8 -77 52 01           ~ 1 0
69 HD 113513 PM* 13 06 50.5849424232 -77 52 13.737559836   9.46 8.77     G5V 40 0
70 Sandqvist 160 DNe 13 06.9 -77 01           ~ 41 0
71 Sz 57 Y*O 13 06 56.5765655088 -77 23 09.640416696   19.56 17.70     M5 19 0
72 Sz 58 Em* 13 06 57.4252298184 -77 23 41.593041672   17.89 16.01     K5 28 0
73 V* BK Cha Or* 13 07 09.247848 -77 30 30.56004   16.11 14.58 14.41   K7 31 0
74 RX J1307.3-7708 X 13 07 15.4 -77 08 15           ~ 2 0
75 Sz 60 ** 13 07 22.760 -77 37 22.89           ~ 17 0
76 PSCz Q13036-7644 Y*O 13 07 36.89 -77 00 09.7           ~ 39 1
77 Hn 26 Y*O 13 07 48.4988968944 -77 41 21.572667204           M2 19 0
78 RX J1308.0-7708 X 13 08 00.3 -77 18 46           ~ 1 0
79 V* BM Cha Or* 13 08 06.2695235808 -77 55 05.329818156   16.77 14.60     K5 51 0
80 2MASS J13084672-7806446 * 13 08 46.7027506752 -78 06 44.612501832           ~ 2 0
81 CHIIXR 37 Y*O 13 09 09.6 -77 09 52           ~ 6 1
82 RX J1309.8-7639 X 13 09 22.9 -76 39 47           ~ 1 0
83 Sz 62 Y*O 13 09 50.37 -77 57 24.0   16.99 15.55     M2.5 31 0
84 Sz 63 Y*O 13 10 04.1819222640 -77 10 44.849941680   15.2       M3 17 0
85 RX J1311.5-7651 TT* 13 11 31.7 -76 51 59           K0 1 0
86 PKS 1308-771 Rad 13 12 38.7545601672 -77 24 13.331465928           ~ 6 0
87 Sz 64 Y*O 13 14 03.7124279328 -77 53 07.576738116   16.3       M5 16 0
88 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3334 1
89 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 436 0

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2022.05.20-19:25:54

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