2004A&A...416..677A


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.19CEST05:03:09

2004A&A...416..677A - Astronomy and Astrophysics, volume 416, 677-697 (2004/3-3)

Multi-wavelength observations of the star forming region in L1616.

ALCALA J.M., WACHTER S., COVINO E., STERZIK M.F., DURISEN R.H., FREYBERG M.J., HOARD D.W. and COOKSEY K.

Abstract (from CDS):

We present the results of a multi-wavelength study of the star forming region in L1616. Our observations include ROSAT All-Sky Survey (RASS) and High Resolution Imager (HRI) X-ray observations, optical wide-field imaging and near-IR imaging data and optical long-slit and multi-object spectroscopic follow-up. 22 new low-mass pre-main sequence (PMS) stars are found to be distributed mainly to the East of the L1616 cometary cloud, in about a one-square-degree field. We find that the class-III infrared sources outnumber the class-II infrared sources by a factor of about three. The X-ray properties of the PMS stars in L1616 are quite similar to those of PMS stars detected in the Orion Nebula Cluster. The comparison of the position of the L1616 PMS stars in the HR diagram with theoretical PMS evolutionary tracks yields an average age of 1-2Myr, with a very small age spread of about 1Myr. Unlike the fossil star forming regions in Orion, L1616 appears to be a region of on-going star formation relatively far from the Orion A and B clouds. Given the small age spread, the spatial distribution of the PMS stars relative to the head of the cloud, as well as its cometary shape and high star formation efficiency, we conclude that the star formation in L1616 was most likely induced by a single event, the impact of the winds of the massive stars of the Orion OB association or a supernova explosion being the possible triggers. The Initial Mass Function (IMF) in L1616 is roughly consistent with that of the field in the mass range 0.3<M/M<2.5. Several faint objects, detected in our optical images, are good candidates for young Brown Dwarfs (BDs). We might expect the number of BDs in L1616 to be intermediate between Taurus and the Trapezium.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: pre-main sequence - stars: low-mass, brown dwarfs - X-rays: stars - ISM: individual objects: L1616

Nomenclature: Table 3: [AWC2004] TTS JHHMMSS.s+DDMMSS N=7, [AWC2004] RX J0506.9-0319 WW (Nos SE, NW), [AWC2004] RX J0506.9-0320 W (Nos W, E). Table A1: [AWC2004] RX J0506.4-0328 W (Nos W, E).

Simbad objects: 72

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Number of rows : 72

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 IC 348 OpC 03 44 34 +32 09.8           ~ 1235 1
2 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1221 0
3 ASAS J045915-0337.1 TT* 04 59 14.5866287990 -03 37 06.251694401 12.74 12.45 11.64 11.18 10.72 G8 7 1
4 2MASS J05041593-0214505 TT* 05 04 15.9280191142 -02 14 50.635476174 14.84 13.99 12.96   11.59 K3 4 0
5 2MASS J05044592-0338227 * 05 04 45.9271543757 -03 38 22.747370269           G8 1 0
6 HD 293772 * 05 05 37.9569657746 -03 22 47.921532519   9.83 9.05     G0 3 0
7 RX J0505.7-0312 X 05 05 41.93 -03 12 54.1           ~ 1 0
8 2MASS J05054588-0327584 * 05 05 45.88 -03 27 58.4           K4 1 0
9 2MASS J05055475-0332196 * 05 05 54.7523381327 -03 32 19.553972750           F6 1 0
10 HD 293771 * 05 06 03.2688168759 -03 21 08.437451991   10.71 10.21     F8 2 0
11 2MASS J05060711-0305013 * 05 06 07.1124648804 -03 05 01.342495927           G2 1 0
12 RX J0506.2-0330 X 05 06 12.93 -03 30 49.8           ~ 1 0
13 TYC 4754-1332-1 * 05 06 13.2064081992 -03 44 39.414701138   11.87 11.38     G2 1 0
14 RX J0506.3-0335 X 05 06 15.42 -03 35 13.9           ~ 1 0
15 [AWC2004] RX J0506.4-0328 W pr* 05 06 23.77 -03 28 47.9   15.18 14.26     ~ 1 0
16 [AWC2004] RX J0506.4-0328 E pr* 05 06 23.98 -03 28 45.9   14.69 14.04     ~ 1 0
17 RX J0506.4-0323 X 05 06 25.98 -03 23 24.4   18.57 17.52     ~ 2 0
18 RX J0506.4-0303 X 05 06 26.22 -03 03 24.3           ~ 1 0
19 HD 32911 * 05 06 27.5990525565 -03 23 02.421000500   8.72 8.32     F2V 9 0
20 RX J0506.5-0320 X 05 06 27.61 -03 20 23.9   19.86 18.12     ~ 2 0
21 2MASS J05063495-0337158 TT* 05 06 34.9490084388 -03 37 15.903578536 13.12 12.44 11.58   11.24 G9 3 0
22 2MASS J05064458-0344422 * 05 06 44.5901154877 -03 44 42.153748855           M0 1 0
23 2MASS J05064605-0319223 TT* 05 06 46.0575877085 -03 19 22.322672738   18.88 17.34 16.09 14.81 K4 4 0
24 2MASS J05064664-0318056 TT* 05 06 46.6474889212 -03 18 05.657997514   16.26 14.86 13.91 13.01 K8.5 3 0
25 2MASS J05064832-0327381 TT* 05 06 48.3296422897 -03 27 38.122080272   17.59 15.96 14.90 13.30 M3.5 3 0
26 2MASS J05064897-0305429 TT* 05 06 48.9789380532 -03 05 43.187192106   18.99 17.33 16.23 14.59 M4.5 3 0
27 RX J0506.9-0319B TT* 05 06 50.8286275288 -03 19 34.942376095   18.18 16.73 15.70 14.31 M2.5 3 0
28 RX J0506.9-0319A TT* 05 06 50.983152 -03 19 38.08416   16.34 14.82 14.06 12.67 K5 5 0
29 RX J0506.9-0319 ** 05 06 50.99448 -03 19 36.9912           ~ 2 0
30 HD 293815 TT* 05 06 51.0558000163 -03 19 59.948785002 10.33 10.24 10.11 9.94 9.77 B9.5Vne 24 1
31 2MASS J05065286-0320532 TT* 05 06 52.8679558198 -03 20 53.296915162   17.36 15.33 13.94 12.39 K8.5 4 0
32 2MASS J05065332-0320526 TT* 05 06 53.3257222344 -03 20 52.665526635   17.66 15.74 14.36 12.87 K0 4 0
33 NGC 1788 RNe 05 06 54 -03 20.5   5.8       ~ 31 1
34 EM* LkHA 333 TT* 05 06 54.6479186666 -03 20 04.763565819 16.55 15.67 14.2     K4 16 2
35 2MASS J05065493-0321126 TT* 05 06 54.9337973395 -03 21 12.736481245   21.12 18.99 17.59 15.94 K1 4 0
36 2MASS J05065551-0321132 TT* 05 06 55.5165285839 -03 21 13.326596208 13.54 13.65 12.84 12.18 11.42 B3e 32 1
37 2MASS J05065694-0318355 TT* 05 06 56.9423281024 -03 18 35.521812177   16.89 15.21 14.08 12.91 M0 3 0
38 LDN 1616 DNe 05 07 00 -03 21.1           ~ 27 0
39 TYC 4758-86-1 * 05 07 03.524 -03 45 02.53   13.20 12.37     G6 1 0
40 Kiso A-0974 16 TT* 05 07 06.0957114002 -03 21 28.264179407   17.56 16.13 15.08 13.87 M1 6 0
41 2MASS J05070760-0323493 pr* 05 07 07.6051459396 -03 23 49.597569214   14.35 13.7     ~ 4 0
42 2MASS J05071094-0323533 TT* 05 07 10.9444230799 -03 23 53.428274835   15.09 13.95   12.61 K4 5 0
43 2MASS J05071499-0326473 TT* 05 07 14.9887373448 -03 26 47.282618478   15.72 14.31 13.42 12.58 M0 3 0
44 2MASS J05071784-0324330 TT* 05 07 17.8484295276 -03 24 33.047688918   18.24 16.67 15.64 14.40 M2.5 3 0
45 2MASS J05072228-0320185 TT* 05 07 22.2726266129 -03 20 18.634414662   18.37 16.71 15.58 13.98 M4 3 0
46 2MASS J05072592-0317122 TT* 05 07 25.9229832605 -03 17 12.463861860   18.68 17.19 16.17 14.70 M3 3 0
47 HD 33056 * 05 07 29.3911573555 -03 18 40.912334360   8.85 8.83     B9V 11 0
48 RX J0507.6-0304 X 05 07 37.49 -03 04 33.1           ~ 1 0
49 2MASS J05073767-0318155 TT* 05 07 37.6555615698 -03 18 15.827349681   16.52 15.16 14.27 13.42 K7 3 0
50 2MASS J05075768-0342346 * 05 07 57.6748414103 -03 42 34.791394995           K1 1 0
51 2MASS J05080142-0322545 TT* 05 08 01.4229795858 -03 22 54.516108945         13.82 M0.5 4 0
52 2MASS J05080193-0317316 TT* 05 08 01.9278208857 -03 17 31.646191306         13.84 M1 3 0
53 2MASS J05080399-0340517 TT* 05 08 03.9947365335 -03 40 51.802590968         14.28 M2.5 3 0
54 Kiso A-0974 21 TT* 05 08 36.556032 -03 03 41.33916   16.82 15.76 15.56 13.46 M1.5 5 0
55 2MASS J05084509-0316524 TT* 05 08 45.1117703856 -03 16 52.306891799         13.88 M3.5 3 0
56 V* V1849 Ori TT* 05 09 00.6611098501 -03 15 06.677948388 12.26 12.09 11.39   10.51 G8 11 0
57 2MASS J05100460-0428037 TT* 05 10 04.5965263780 -04 28 03.656710870 13.36 12.65 11.73   10.41 K4 8 0
58 V* V1011 Ori TT* 05 10 10.8582783100 -02 54 05.051798663 14.27 13.97 12.96 12.67 11.24 K1e 8 1
59 2MASS J05101478-0330074 TT* 05 10 14.7717490565 -03 30 07.353356510   12.53 11.74 11.29 10.87 G8 10 0
60 2MASS J05104050-0316415 TT* 05 10 40.4949043455 -03 16 41.572103583 12.11 12.01 11.38   10.57 G2 6 0
61 V* V1850 Ori TT* 05 11 38.9322228341 -03 48 47.069564386 13.13 12.77 12.02   11.01 K1 9 0
62 V* V531 Ori V* 05 12 20.5314934999 -02 55 52.459970485 14.10 13.56 12.61 12.05 11.49 K2 13 0
63 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2002 1
64 * lam Ori ** 05 35 08.27761 +09 56 02.9611 2.45 3.48 3.66 3.72 3.89 O8IIIf+B0.5V 265 0
65 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1478 1
66 NAME Ori Complex Cld 05 35.3 -05 23           ~ 336 0
67 NAME Ori I As* 05 38 -02.8           ~ 560 0
68 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 692 1
69 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1173 0
70 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 859 1
71 NAME Upper Centaurus Lupus As* 15 24 -41.9           ~ 365 1
72 NAME Upper Sco Association As* 16 12 -23.4           ~ 1048 1

    Equat.    Gal    SGal    Ecl

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2020.09.19-05:03:09

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