2013A&A...552A..94S


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.28CET11:14:09

2013A&A...552A..94S - Astronomy and Astrophysics, volume 552A, 94-94 (2013/4-1)

The central density of R136 in 30 Doradus.

SELMAN F.J. and MELNICK J.

Abstract (from CDS):

The central density, ρ0, of a stellar cluster is an important physical parameter for determining its evolutionary and dynamical state. How much mass segregation there is or whether the cluster has undergone core collapse both depend on ρ0. We reanalyze the results of a previous paper that gives the mass density profile of R136 and combine them with both a conservative upper limit for the core parameter and a more uncertain recent measurement. We thus place a lower limit on ρ0 under reasonable and defensible assumptions about the IMF, finding ρ0≥1.5x104M/pc3 for the conservative assumption a <0.4pc for the cluster core parameter. If we use the lower, but more uncertain value a=0.025pc, the central density estimate becomes greater than 107M/pc3. A mechanism based on the destruction of a large number of circumstellar disks is posited to explain the hitherto unexplained increase in reddening presented in that same work.

Abstract Copyright:

Journal keyword(s): circumstellar matter - galaxies: clusters: individual: R 136 - stars: luminosity function, mass function - Magellanic Clouds - dust, extinction

Simbad objects: 8

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Number of rows : 8

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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9241 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5505 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14558 1
4 NAME 30 Dor Region reg 05 38.0 -69 06           ~ 169 0
5 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1030 2
6 RMC 136 Cl* 05 38 42.396 -69 06 03.36   9.63 9.50     ~ 1700 2
7 Brey 83 WR* 05 38 44.1120 -69 05 54.960   12.04 11.92     WN 22 0
8 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 621 0

    Equat.    Gal    SGal    Ecl

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2020.02.28-11:14:09

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