2005A&A...437..911S


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET18:58:50

2005A&A...437..911S - Astronomy and Astrophysics, volume 437, 911-918 (2005/7-3)

Number ratios of young stellar objects in embedded clusters.

SCHMEJA S., KLESSEN R.S. and FROEBRICH D.

Abstract (from CDS):

Embedded clusters usually contain young stellar objects in different evolutionary stages. We investigate number ratios of objects in these classes in the star-forming regions ρ Ophiuchi, Serpens, Taurus, Chamaeleon I, NGC 7129, IC 1396A and IC 348. They are compared to the temporal evolution of young stars in numerical simulations of gravoturbulent fragmentation in order to constrain the models and to determine the evolutionary stage of the clusters. Serpens is the youngest and IC 348 the most evolved cluster, although the time when the observations are best represented by the models varies strongly depending on the model. We find an inverse correlation of the star formation efficiency (SFE) of the models with the Mach number. However, the observational SFE values cannot be reproduced by the current isothermal models. This argues for models that take into account protostellar feedback processes and/or the effects of magnetic fields.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: pre-main sequence - ISM: clouds - Galaxy: open clusters and associations: general

Simbad objects: 12

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Number of rows : 12

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 7822 HII 00 01 08.58 +67 25 17.0           ~ 112 3
2 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1117 0
3 IC 348 OpC 03 44 34 +32 09.8           ~ 1245 1
4 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3637 0
5 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1009 1
6 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3129 1
7 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 952 2
8 NAME Elephant Trunk Nebula MoC 21 36 +57.4           ~ 47 0
9 NGC 7129 OpC 21 42 56 +66 06.2     11.5     ~ 236 0
10 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 636 2
11 IRAS 22176+6303 Y*O 22 19 17.978 +63 18 52.92           ~ 590 0
12 NAME Cep C SFR 23 05 50.0 +62 30 01           ~ 30 0

    Equat.    Gal    SGal    Ecl

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2021.02.24-18:58:50

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