2012ApJ...752....9M

Query : 2012ApJ...752....9M

2012ApJ...752....9M - Astrophys. J., 752, 9 (2012/June-2)

Mass and luminosity evolution of young stellar objects.

MYERS P.C.

Abstract (from CDS):

A model of protostar mass and luminosity evolution in clusters gives new estimates of cluster age, protostar birthrate, accretion rate, and mean accretion time. The model assumes constant protostar birthrate, core-clump accretion, and equally likely accretion stopping. Its parameters are set to reproduce the initial mass function and to match protostar luminosity distributions in nearby star-forming regions. It obtains cluster ages and birthrates from the observed numbers of protostars and pre-main sequence (PMS) stars, and from the modal value of the protostar luminosity. In 31 embedded clusters and complexes, the global cluster age is 1-3 Myr, matching available estimates based on optical spectroscopy (OS) and evolutionary tracks. This method of age estimation is simpler than OS and is more useful for young embedded clusters where optical spectroscopy is not possible. In the youngest clusters, the protostar fraction decreases outward from the densest gas, indicating that the local star-forming age increases outward from a few 0.1 Myr in small protostar-dominated zones to a few Myr in large PMS-dominated zones.

Abstract Copyright: ∼

Journal keyword(s): ISM: clouds - stars: formation

CDS comments: I20050-1 not found in 2012AJ....144...31K.

Simbad objects: 36

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Number of rows : 36
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 IC 1848 OpC 02 51 25.2 +60 25 08   6.87 6.5     ~ 491 2
2 RAFGL 490 Y*O 03 27 38.7928952784 +58 47 00.025298088           ~ 352 0
3 NGC 1333 OpC 03 29 11.3 +31 18 36           ~ 1450 1
4 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1365 0
5 IC 348 OpC 03 44 31.7 +32 09 32           ~ 1393 1
6 EM* LkHA 101 Em* 04 30 14.4355820328 +35 16 23.983198932   17.91 15.71 13.33   F 356 1
7 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4418 0
8 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1676 0
9 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2332 0
10 NAME Ori A MoC 05 38 -07.1           ~ 3012 0
11 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 742 2
12 GGD 12 HH 06 10 50.6 -06 11 50           ~ 59 1
13 RCW 38 SFR 08 59 05.50 -47 30 39.4           ~ 305 2
14 NAME Carina Molecular Cloud Complex MoC 10 43 10 -59 38.2           ~ 81 0
15 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1154 1
16 NAME Cha II MoC 12 54 -77.2           ~ 337 0
17 NAME Lupus Complex SFR 16 03 -38.1           ~ 720 0
18 Lupus 3 SFR 16 09.6 -39 03           ~ 323 0
19 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3631 1
20 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1100 2
21 NAME Serpens South Cluster Cl* 18 30 03.00 -02 01 58.2           ~ 132 0
22 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 490 0
23 NAME Cyg Complex reg 20 32 +45.0           ~ 601 0
24 [BKH2010] G81.44+0.75 Cl* 20 37 26.730 +42 14 38.67           ~ 2 0
25 [BKH2010] G81.37+0.55 Cl* 20 37 57.510 +42 05 25.25           ~ 2 0
26 [BKH2010] G81.48+0.61 OpC 20 38 06.270 +42 11 48.22           ~ 7 0
27 [BKH2010] G81.51+0.43 Cl* 20 38 50.060 +42 07 55.83           ~ 2 0
28 [BKH2010] G82.55+0.40 Cl* 20 42 26.830 +42 55 33.46           ~ 2 0
29 [BKH2010] G82.58+0.21 Cl* 20 43 25.750 +42 50 28.60           ~ 2 0
30 [BKH2010] G82.57+0.12 Cl* 20 43 44.630 +42 46 50.87           ~ 2 0
31 NAME [C86] L988 e Cluster OpC 21 04 06.5 +50 14 42           ~ 15 0
32 IC 5146 OpC 21 53 29.3 +47 14 46           ~ 467 2
33 SH 2-140 N HII 22 19 27.7 +63 32 56           ~ 29 0
34 LDN 1211 DNe 22 47 39 +62 01.3           ~ 37 0
35 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 741 2
36 NAME III CEP ASSOC As* 23 04.2 +63 24           ~ 322 0

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