1999ApJ...526..336O


Query : 1999ApJ...526..336O

1999ApJ...526..336O - Astrophys. J., 526, 336-343 (1999/November-3)

A deep near-infrared survey of the Chamaeleon I dark cloud core.

OASA Y., TAMURA M. and SUGITANI K.

Abstract (from CDS):

We have carried out a deep near-infrared imaging survey to search for low-mass young stellar objects (YSOs) in the densest star-forming core of the Chamaeleon I dark cloud. Our observations cover an area of 30 arcmin2, including an early B9 star (HD 97300) and an outflow source (HM 23). The 10 σ limiting magnitudes are 18.1, 17.0, and 16.2 mag at J, H, and K, respectively, which is sensitive enough to provide a census of the embedded stellar population down to substellar objects in the cloud. Source classification is performed based on the near-infrared (NIR) color-color diagram. Many of the YSO candidates with NIR excesses are more than 7 mag fainter than typical T Tauri stars in the same cloud. Some of them are even fainter than the known brown dwarfs in the Pleiades. The luminosities of newly identified YSO candidates and the recent evolutionary models for very low mass objects suggest that they appear to be substellar, if their typical age is assumed to be similar to that of classic T Tauri stars or, namely, 1 Myr with an upper limit of 10 Myr. Therefore it is highly likely that young brown dwarfs form in this molecular cloud core. The J-band luminosity function of the YSO candidates does not appear to turn over down to the completeness limit. In the Chamaeleon I dark cloud core, stars form in a clustered mode characterized by both a high star formation efficiency and high stellar density such as in the ρ Oph core.

Abstract Copyright:

Journal keyword(s): Infrared: Stars - ISM: individual (Chamaeleon I) - Stars: Formation - stars: low-mass, brown dwarfs - stars: luminosity function, mass function - stars: pre-main-sequence

Nomenclature: Table 1: OTS NN (Nos 1-61).

Simbad objects: 67

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Number of rows : 67
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3279 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4093 0
3 HD 75223 * 08 47 21.9725590104 -39 47 59.119125288   7.50 7.20     A1V 22 0
4 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1095 1
5 OTS 1 * 11 09 07.8 -76 36 39           ~ 1 0
6 OTS 2 Y*O 11 09 10.5871436856 -76 32 50.895043908           M0.5 6 0
7 OTS 3 * 11 09 12.1 -76 36 27           ~ 1 0
8 OTS 4 * 11 09 12.3 -76 36 04           ~ 1 0
9 OTS 6 * 11 09 15.6 -76 35 14           ~ 1 0
10 OTS 5 * 11 09 15.6 -76 32 03           ~ 1 0
11 OTS 7 Y*O 11 09 15.7 -76 36 43           ~ 6 0
12 OTS 8 * 11 09 16.2 -76 35 36           ~ 1 0
13 OTS 9 * 11 09 19.1 -76 36 56           ~ 1 0
14 V* HV Cha Or* 11 09 22.6489972128 -76 34 32.164757616         16.79 M0.75-M1.75 51 0
15 OTS 11 Y*O 11 09 24.1 -76 34 57           ~ 6 0
16 OTS 12 * 11 09 25.8173094576 -76 34 57.338352984           ~ 1 0
17 HJM C 1-3 Y*O 11 09 26.0327179056 -76 33 33.892130016         17.78 ~ 14 0
18 OTS 14 Y*O 11 09 28.52064 -76 34 45.6456           ~ 2 0
19 V* GM Cha Or* 11 09 28.55424 -76 33 28.1376           M3.5-M6.5 45 0
20 OTS 16 * 11 09 32.6 -76 34 41           ~ 1 0
21 OTS 17 * 11 09 34.4 -76 32 34           ~ 2 0
22 OTS 18 IR 11 09 36.6 -76 33 39           ~ 8 0
23 V* HW Cha Or* 11 09 41.9146999920 -76 34 58.572141600           M0- 33 0
24 HJM C 1-21 Y*O 11 09 43.06 -76 33 29.8           M0.5 8 0
25 Hn 10W * 11 09 43.083 -76 34 38.64           ~ 5 0
26 OTS 22 * 11 09 45.3 -76 32 20           ~ 1 0
27 HJM C 1-24 TT* 11 09 46.1881553592 -76 34 46.503994080   11.93 18.41   14.72 M3.25e 56 1
28 OTS 23 * 11 09 46.3 -76 31 45           ~ 3 0
29 HJM C 1-22 Y*O 11 09 47.72 -76 34 06.0           ~ 8 0
30 HD 97300 Ae* 11 09 50.0199904704 -76 36 47.718191232   9.41 9.20   8.82 B9V 167 1
31 Ass Cha T 1-23 Or* 11 09 53.4189070920 -76 34 25.652641116   13.9 19.50 15.10 13.52 G9IIIe 87 0
32 HJM C 1-2 Or* 11 09 55.0429130952 -76 32 41.105143464         17.85 M0- 31 0
33 V* WW Cha Or* 11 10 00.0802739160 -76 34 57.963853416   14.74 14.10   10.95 ~ 146 0
34 OTS 30 * 11 10 01.9 -76 32 48           ~ 1 0
35 [PMK99] IR Cha INa4 Y*O 11 10 03.368 -76 33 11.13           M4: 15 0
36 HJM C 1-4 Y*O 11 10 03.6830951520 -76 33 29.218685616     18.78 16.1 14.72 K8e 56 0
37 OTS 31 Y*O 11 10 04.1 -76 32 33           ~ 3 0
38 V* FN Cha Or* 11 10 04.6714603680 -76 35 45.253161564     14.68 13.89 12.39 K5Ve 53 0
39 OTS 34 * 11 10 05.6 -76 31 53           ~ 1 0
40 OTS 36 * 11 10 06.8 -76 33 51           ~ 1 0
41 OTS 37 * 11 10 07.0 -76 36 53           ~ 2 0
42 OTS 38 * 11 10 08.1 -76 34 31           ~ 1 0
43 OTS 39 * 11 10 09.1 -76 36 27           ~ 1 0
44 OTS 42 * 11 10 09.3308668680 -76 35 06.424623924           ~ 5 0
45 OTS 44 Y*O 11 10 09.34392 -76 32 17.8512           M9.5+ 57 0
46 OTS 40 * 11 10 09.5 -76 33 17           ~ 1 0
47 OTS 41 * 11 10 09.8 -76 36 00           ~ 1 0
48 OTS 43 * 11 10 11.1 -76 36 19           ~ 1 0
49 HJM C 1-8 Y*O 11 10 11.3918141448 -76 35 29.247545184         13.75 K5Ve 53 0
50 OTS 46 * 11 10 13.9 -76 31 46           ~ 1 0
51 OTS 47 * 11 10 14.5 -76 32 19           ~ 1 0
52 OTS 48 IR 11 10 16.4 -76 34 31           ~ 5 0
53 OTS 49 * 11 10 17.0 -76 32 49           ~ 1 0
54 OTS 50 * 11 10 22.5 -76 32 35           ~ 1 0
55 OTS 51 * 11 10 25.1 -76 33 28           ~ 1 0
56 OTS 52 * 11 10 25.5 -76 34 34           ~ 1 0
57 OTS 53 * 11 10 27.0 -76 35 25           ~ 1 0
58 OTS 54 * 11 10 28.5 -76 35 18           ~ 1 0
59 OTS 55 * 11 10 30.8 -76 34 10           ~ 1 0
60 OTS 56 Y*O 11 10 32.8 -76 32 45           ~ 3 0
61 OTS 57 * 11 10 33.4 -76 33 21           ~ 1 0
62 OTS 60 * 11 10 34.5 -76 36 45           ~ 1 0
63 OTS 59 Y*O 11 10 34.5 -76 35 49           ~ 3 0
64 OTS 58 * 11 10 34.8 -76 31 57           ~ 1 0
65 2MASS J11104290-7634048 Y*O 11 10 42.90000 -76 34 04.8036           M0- 5 0
66 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3446 1
67 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 454 0

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2023.01.28-10:51:08

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