2005ApJ...624..808L


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET17:32:28

2005ApJ...624..808L - Astrophys. J., 624, 808-820 (2005/May-2)

Triggered star formation in the Orion bright-rimmed clouds.

LEE H.-T., CHEN W.P., ZHANG Z.-W. and HU J.-Y.

Abstract (from CDS):

We have developed an empirical and effective set of criteria, based on the Two Micron All Sky Survey (2MASS) colors, to select candidate classical T Tauri stars (CTTSs). This provides a useful tool to study the young stellar population in star-forming regions. Here we present our analysis of the bright-rimmed clouds (BRCs) B35, B30, IC 2118, LDN 1616, LDN 1634, and Ori East to show how massive stars interact with molecular clouds to trigger star formation. Our results support the radiation-driven implosion model, in which the ionization fronts from OB stars compress a nearby cloud until the local density exceeds the critical value, thereby inducing the cloud to collapse to form stars. We find that only BRCs associated with strong IRAS 100 µm emission (a tracer of high density) and Hα emission (a tracer of ionization fronts) show signs of ongoing star formation. Relevant timescales, including the ages of O stars, expanding H II regions, and the ages of CTTSs, are consistent with sequential star formation. We also find that CTTSs are only seen between the OB stars and the BRCs, with those closer to the BRCs being progressively younger. There are no CTTSs leading the ionization fronts, i.e., within the molecular clouds. All of these findings provide strong evidence of triggered star formation and show the major roles massive stars play in sustaining the star-forming activities in the region.

Abstract Copyright:

Journal keyword(s): ISM: Clouds - ISM: Molecules - Stars: Formation - Stars: Pre-Main-Sequence

Nomenclature: Table 2: [LCZ2005] NN (Nos 1-32).

Simbad objects: 59

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Number of rows : 59

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 1909 RNe 05 02 -07.9           ~ 34 0
2 [SSG2002] MMS 1A mm 05 06 44.4 -03 21 34           ~ 3 0
3 LDN 1616 DNe 05 07 00 -03 21.1           ~ 29 0
4 Kiso A-0974 19 TT* 05 07 30.165888 -06 10 15.97224   17.02 15.47 14.20   K5IV 12 0
5 Kiso A-0974 20 TT* 05 07 30.617016 -06 10 59.77524   16.44 14.75 14.26   K7IV 9 0
6 V* V531 Ori V* 05 12 20.5314934999 -02 55 52.459970485 14.10 13.56 12.61 12.05 11.49 K2 14 0
7 NAME HH 240/241 DNe 05 19 48.9 -05 52 05           ~ 106 1
8 V* V534 Ori Or* 05 20 25.7455453623 -05 47 06.385193463   14 13.5     ~ 12 0
9 Barnard 30 DNe 05 30.3 +12 46           ~ 40 0
10 NAME RNO 43 FIR HH 05 32 23.0 +12 49 54           ~ 46 0
11 V* IR Ori Or* 05 34 27.6518873148 -04 57 05.111530003     16.6     M2 18 0
12 V* V1970 Ori Or* 05 34 29.7882403260 -04 51 47.653693274     16.80   14.39 K7 18 0
13 V* V653 Ori S* 05 34 58.7782740174 -09 28 27.407603999     12.15     S 8 0
14 * lam Ori ** 05 35 08.27761 +09 56 02.9611 2.45 3.48 3.66 3.72 3.89 O8IIIf+B0.5V 273 0
15 V* V481 Ori Or* 05 35 09.0129645799 -04 27 51.092730903     13.1     ~ 25 0
16 * tet01 Ori A Ae* 05 35 15.8252169327 -05 23 14.332546552 5.87 6.75 6.73 6.42 6.21 B0V 463 1
17 * tet01 Ori B Al* 05 35 16.1338018078 -05 23 06.780627482 7.71 8.20 7.96     B1V 349 2
18 * tet01 Ori C ** 05 35 16.4664092288 -05 23 22.897102710 4.20 5.15 5.13 4.91 4.73 O7Vp 1294 1
19 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1499 1
20 * tet01 Ori D Y*O 05 35 17.2574309230 -05 23 16.567215876 6.08 6.79 6.70 6.40 6.20 B1.5Vp 308 0
21 M 42 HII 05 35 17.3 -05 23 28           ~ 3777 0
22 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 500 0
23 NAME Ori Complex Cld 05 35.3 -05 23           ~ 357 0
24 NAME lam Ori Molecular Ring HII 05 35.3 +09 56           ~ 67 1
25 V* V2554 Ori Or* 05 35 36.7233384141 -05 10 00.417339247   15.1 18.43   15.092 M3 27 0
26 NAME lambda Ori Nebula HII 05 37 +09.9           ~ 12 2
27 Haro 5-79 TT* 05 37 18.8502061765 -00 20 41.702785982     13.95   12.66 K3 11 0
28 V* AQ Lep Mi* 05 37 50.0644562854 -15 48 11.450985349           M9 10 0
29 NAME Ori I As* 05 38 -02.8           ~ 566 0
30 NAME Ori A MoC 05 38 -07.1           ~ 2744 0
31 Haro 4-456 Y*O 05 38 51.4977967828 -08 01 27.436398685     20.847   16.382 M5.2 14 0
32 ESO-HA 1733 Y*O 05 40 24.9650461720 -07 55 35.196234422     17.833   15.085 M2 13 0
33 V* DL Ori Or* 05 41 25.3543568979 -08 05 54.724911984   13.97 12.95 12.57   K1 52 0
34 Kiso A-1048 45 Y*O 05 41 27.7156412953 -09 31 41.454224778   17.17 15.89 15.68   ~ 9 0
35 Haro 4-488 Y*O 05 41 33.2244700249 -07 55 02.267176788     16.228   13.978 K7.0 20 0
36 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 692 1
37 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1213 0
38 2MASS J05423584-0958552 Y*O 05 42 35.8346117976 -09 58 55.317179610     14.3     ~ 7 0
39 V* V2760 Ori Or* 05 43 27.0101424052 -09 59 37.651805586           K5 7 0
40 Barnard 35 DNe 05 45.5 +09 03           ~ 50 0
41 LDN 1622 DNe 05 54 28 +01 48.2           ~ 95 0
42 LDN 1621 DNe 05 55.0 +02 20           ~ 13 0
43 2MASS J06014515-1413337 Y*O 06 01 45.1503238377 -14 13 33.860871265           F6 3 0
44 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 665 2
45 HBC 518 Em* 06 07 52.4325056664 -05 16 03.733682233   13.3       F6 10 0
46 2MASS J06075463-0614342 * 06 07 54.6294011947 -06 14 34.191163892           K0 1 0
47 2MASS J06080003-0519022 * 06 08 00.0299483236 -05 19 02.326527430           K0 1 0
48 2MASS J06160006-1727270 C* 06 16 00.0603077764 -17 27 26.939297503           C 2 0
49 IRAS 06198-0254 * 06 22 23.7620024900 -02 55 50.884910859           ~ 1 0
50 2MASS J06261259-1028346 * 06 26 12.6008061615 -10 28 34.600241731           ~ 1 0
51 LDN 1652 DNe 06 26.4 -10 02           ~ 16 0
52 2MASS J06265037-0738456 * 06 26 50.3784562044 -07 38 45.538126949           M2 1 0
53 2MASS J06265529-0958014 V* 06 26 55.3038938120 -09 58 01.448811742           ~ 3 0
54 2MASS J06265731-0959395 * 06 26 57.3199118797 -09 59 39.609089168           ~ 1 0
55 IRAS 06246-0539 * 06 27 06.5480660884 -05 40 51.340439537           ~ 1 0
56 2MASS J06273428-1002397 TT* 06 27 34.2860793280 -10 02 39.705468505           K7 2 0
57 2MASS J06280028-1003420 * 06 28 00.2759301319 -10 03 42.002097749           ~ 1 0
58 IRAS 06355-0554 C* 06 38 01.8003344609 -05 57 17.076162900           C 3 0
59 NAME MONOCEROS NEB SNR 06 38 43 +06 30.2           ~ 222 0

    Equat.    Gal    SGal    Ecl

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2021.03.05-17:32:28

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