2008ApJ...687.1303G


Query : 2008ApJ...687.1303G

2008ApJ...687.1303G - Astrophys. J., 687, 1303-1322 (2008/November-2)

The star formation in the L1615/L1616 cometary cloud.

GANDOLFI D., ALCALA J.M., LECCIA S., FRASCA A., SPEZZI L., COVINO E., TESTI L., MARILLI E. and KAINULAINEN J.

Abstract (from CDS):

The present work aims at performing a comprehensive census and characterization of the pre-main-sequence (PMS) population in the cometary cloud L1615/L1616, in order to assess the significance of the triggered star formation scenario and investigate the impact of massive stars on its star formation history and mass spectrum. Our study is based on UBVRCIC and JHKsphotometry, as well as optical multiobject spectroscopy. We performed a physical parameterization of the young stellar population in L1615/L1616. We identified 25 new T Tauri stars mainly projected on the dense head of the cometary cloud, almost doubling the current number of known members. We studied the spatial distribution of the cloud members as a function of the age and Hα emission. The star formation efficiency (SFE) in the cloud is ∼7%-8%, as expected for molecular clouds in the vicinity of OB associations. The slope of the initial mass function (IMF), in the mass range 0.1 M≤M≤5.5 M, is consistent with that of other T and OB associations, providing further support of a universal IMF down to the hydrogen-burning limit, regardless of environmental conditions. The cometary appearance, as well as the high SFE, can be explained in terms of triggered star formation induced by the strong UV radiation from OB stars or supernova shock waves. The age spread and both the spatial and age distribution of the PMS objects provide strong evidence of sequential, multiple events and possibly still ongoing star formation activity in the cloud.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - Infrared: Stars - ISM: individual (L1615) - ISM: individual (L1616) - Stars: Formation - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence

Nomenclature: Table 2: [AWC2004] TTS JHHMMSS.s+DDMMSS N=21 added.

Simbad objects: 82

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Number of rows : 82
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 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 820 1
2 Cl Melotte 20 OpC 03 26 28 +48 58.5           ~ 804 0
3 IC 348 OpC 03 44 32 +32 09.5           ~ 1321 1
4 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3231 0
5 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1301 0
6 1RXS J045912.4-033711 TT* 04 59 14.5874011488 -03 37 06.286801872 12.74 12.45 11.64 11.18 10.72 G8 8 1
7 2MASS J05041593-0214505 TT* 05 04 15.9290176680 -02 14 50.646614280 14.84 13.99 12.96   11.59 K3 5 0
8 2MASS J05051346-0342478 TT* 05 05 13.4664757320 -03 42 47.880794124       18.97 17.03 M5.5 2 0
9 LDN 1615 DNe 05 05.5 -03 26           ~ 14 0
10 2MASS J05053885-0326263 TT* 05 05 38.8479664896 -03 26 26.395236168   18.88 17.30 16.21 14.67 M3.5 3 0
11 RX J0506.4-0323 X 05 06 25.98 -03 23 24.4   18.57 17.52     ~ 2 0
12 RX J0506.5-0320 X 05 06 27.61 -03 20 23.9   19.86 18.12     ~ 2 0
13 2MASS J05063495-0337158 TT* 05 06 34.9489529712 -03 37 15.903080724 13.12 12.44 11.58   11.24 G9 4 0
14 [SSG2002] MMS 1A mm 05 06 44.4 -03 21 34           ~ 3 0
15 2MASS J05064442-0329128 TT* 05 06 44.4295830216 -03 29 12.872791680   19.33 17.69 16.68 15.08 M4.5 3 0
16 ATO J076.6919-03.3228 TT* 05 06 46.0576840392 -03 19 22.320867396   18.88 17.34 16.09 14.81 K4 5 0
17 CVSO 286 TT* 05 06 46.6477021992 -03 18 05.661047088   16.26 14.86 13.91 13.01 K8.5 5 0
18 2MASS J05064745-0319096 TT* 05 06 47.4569796480 -03 19 09.640068996   22.55 20.51 19.01 16.75 M5.5 2 0
19 RX J0506.8-0327 TT* 05 06 48.3297256560 -03 27 38.122259976   17.59 15.96 15.623 13.30 M3.5 6 0
20 2MASS J05064897-0305429 TT* 05 06 48.9787831488 -03 05 43.183779540   18.99 17.33 16.23 14.59 M4.5 4 0
21 2MASS J05064976-0319330 TT* 05 06 49.7691932808 -03 19 32.965854276   19.42 17.63 16.32 14.48 M3.5 3 0
22 2MASS J05064977-0321036 TT* 05 06 49.7809123248 -03 21 03.537239256   19.91 18.59 17.30 15.56 M1: 3 0
23 2MASS J05065050-0320142 TT* 05 06 50.5078928712 -03 20 14.348117112   23.58 21.11 19.18 16.51 M6.5 2 0
24 2MASS J05065074-0320079 TT* 05 06 50.7459313848 -03 20 08.037306564   21.50 19.54 18.14 16.03 M4.5 2 0
25 RX J0506.9-0319B TT* 05 06 50.8286588232 -03 19 34.940624412   18.18 16.73 15.70 14.31 M2.5 3 0
26 RX J0506.9-0319A TT* 05 06 50.983152 -03 19 38.08416   16.34 14.82 14.06 12.67 K5 5 0
27 HD 293815 TT* 05 06 51.0557695968 -03 19 59.949324624 10.33 10.24 10.11 9.94 9.77 B9.5Vne 25 1
28 2MASS J05065286-0320532 TT* 05 06 52.8656178384 -03 20 53.309539752   17.36 15.33 13.94 12.39 K8.5 4 0
29 2MASS J05065332-0320526 TT* 05 06 53.3264361936 -03 20 52.681324452   17.66 15.74 14.36 12.87 K0 5 0
30 NGC 1788 RNe 05 06 54 -03 20.5   5.8       ~ 32 1
31 2MASS J05065452-0320460 TT* 05 06 54.5277388824 -03 20 46.063530384       20.98 18.92 M4 2 0
32 EM* LkHA 333 TT* 05 06 54.6487493904 -03 20 04.813141308 16.55 15.67 14.2     K4 16 2
33 2MASS J05065493-0321126 TT* 05 06 54.9329924256 -03 21 12.723028344   21.12 18.99 17.59 15.94 K1 4 0
34 IRAS X0504-034 IR 05 06 55.2 -03 21 10           ~ 2 0
35 2MASS J05065551-0321132 TT* 05 06 55.5165452664 -03 21 13.327504020 13.54 13.65 12.84 12.18 11.42 B3e 35 1
36 ATO J076.7372-03.3098 TT* 05 06 56.9423054136 -03 18 35.519994864   16.89 15.21 14.08 12.91 M0 5 0
37 2MASS J05065697-0316404 TT* 05 06 56.9709338328 -03 16 40.587416904   18.80 17.69 16.48 14.88 M4.5 4 0
38 LDN 1616 DNe 05 07 00 -03 21.1           ~ 31 0
39 2MASS J05070471-0302410 TT* 05 07 04.7192459256 -03 02 41.049250872   21.87 20.04 18.81 16.75 M6 2 0
40 2MASS J05070531-0300061 TT* 05 07 05.3166304968 -03 00 06.253311096   16.95 15.50 14.55 13.60 M0 3 0
41 Kiso A-0974 16 TT* 05 07 06.0957293712 -03 21 28.262970576   17.56 16.13 15.08 13.87 M1 7 0
42 2MASS J05070621-0317028 TT* 05 07 06.2146142520 -03 17 03.068840292   21.83 19.99 18.71 16.66 M6 2 0
43 2MASS J05070760-0323493 Y*O 05 07 07.6052183832 -03 23 49.597297692   14.35 13.7     ~ 4 0
44 2MASS J05071094-0323533 TT* 05 07 10.9444236912 -03 23 53.427599484   15.09 13.95   12.61 K4 6 0
45 2MASS J05071351-0317220 TT* 05 07 13.5089925864 -03 17 22.534884204   19.09 17.57 16.55 15.61 K8.5 2 0
46 ATO J076.8124-03.4464 TT* 05 07 14.9887872600 -03 26 47.281200756   15.72 14.31 13.42 12.58 M0 5 0
47 ATO J076.8243-03.4091 TT* 05 07 17.8483769472 -03 24 33.047480304   18.24 16.67 15.64 14.40 M2.5 5 0
48 2MASS J05072228-0320185 TT* 05 07 22.2726266129 -03 20 18.634414662   18.37 16.71 15.58 13.98 M4 3 0
49 2MASS J05072592-0317122 TT* 05 07 25.9230288192 -03 17 12.462591012   18.68 17.19 16.17 14.70 M3 4 0
50 2MASS J05072979-0317051 TT* 05 07 29.7857705616 -03 17 05.313659244   22.77 20.83 19.39 17.16 M6.5 2 0
51 2MASS J05073085-0318455 TT* 05 07 30.8867582376 -03 18 45.806759568     22.12 21.09 18.93 M5.5 2 0
52 2MASS J05073357-0325167 TT* 05 07 33.5701879128 -03 25 16.714987212   21.36 19.62 18.39 16.49 M5.5 3 0
53 2MASS J05073482-0315207 TT* 05 07 34.8236143944 -03 15 20.782127268   20.59 19.05 17.85 16.10 M5 2 0
54 RX J0507.6-0318 TT* 05 07 37.6556403288 -03 18 15.826341348   16.52 15.16 14.27 13.42 K7 5 0
55 2MASS J05074100-0322529 TT* 05 07 41.0056748688 -03 22 52.844762460   19.16 17.55 16.51 14.96 M4 3 0
56 2MASS J05074135-0315066 TT* 05 07 41.3443349736 -03 15 06.646855680   19.43 17.92 16.86 15.13 M4.5 3 0
57 2MASS J05075195-0320028 TT* 05 07 51.9457187376 -03 20 02.964417432   21.30 19.55 18.27 16.32 M5.5 2 0
58 2MASS J05080142-0322545 TT* 05 08 01.4229055944 -03 22 54.514328484         13.82 M0.5 5 0
59 CVSO 293 TT* 05 08 01.9288704384 -03 17 31.631931168         13.84 M1 4 0
60 2MASS J05080399-0340517 TT* 05 08 03.9946436472 -03 40 51.803073372         14.28 M2.5 4 0
61 Kiso A-0974 21 TT* 05 08 36.5502852024 -03 03 41.421598020   16.82 15.76 15.56 13.46 M1.5 6 0
62 ATO J077.1879-03.2812 TT* 05 08 45.1115217120 -03 16 52.314348504         13.88 M3.5 5 0
63 V* V1849 Ori TT* 05 09 00.6610859928 -03 15 06.679606896 12.26 12.09 11.39   10.51 G8 12 0
64 2MASS J05100460-0428037 TT* 05 10 04.5964274304 -04 28 03.656210736 13.36 12.65 11.73   10.41 K4 8 0
65 V* V1011 Ori TT* 05 10 10.8579174072 -02 54 05.062364892 14.27 13.97 12.96 12.67 11.24 K1e 11 1
66 2MASS J05101478-0330074 TT* 05 10 14.7718055712 -03 30 07.353718632   12.53 11.74 11.29 10.87 G8 10 0
67 2MASS J05104050-0316415 TT* 05 10 40.4948070288 -03 16 41.570053284 12.11 12.01 11.38   10.57 G2 7 0
68 V* V1850 Ori TT* 05 11 38.9321631144 -03 48 47.070254232 13.13 12.77 12.02   11.01 K1 11 0
69 V* V531 Ori V* 05 12 20.5314421032 -02 55 52.459617072 14.10 13.56 12.61 12.05 11.49 K2 14 0
70 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2174 1
71 Cl Collinder 69 OpC 05 35 10 +09 48.8     2.8     ~ 277 0
72 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1558 1
73 NAME Ori Complex Cld 05 35.3 -05 23           ~ 395 0
74 [NCM2003] MIR 5 IR 05 35 18.34 -05 00 32.8           ~ 2 0
75 NAME Ori I As* 05 38 -02.8           ~ 587 0
76 NAME Ori A MoC 05 38 -07.1           ~ 2870 0
77 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 526 0
78 NGC 2168 OpC 06 09 05 +24 20.2           ~ 513 0
79 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1076 1
80 NAME Cha II MoC 12 54 -77.2           ~ 317 0
81 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3397 1
82 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1030 2

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2022.10.03-00:58:00

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