2001A&A...369...74S


Query : 2001A&A...369...74S

2001A&A...369...74S - Astronomy and Astrophysics, volume 369, 74-86 (2001/4-1)

Stellar luminosity functions of rich star clusters in the Large Magellanic Cloud.

SANTIAGO B., BEAULIEU S., JOHNSON R. and GILMORE G.F.

Abstract (from CDS):

We show the results of deep V and I HST photometry of 6 rich star clusters in the Large Magellanic Cloud with different ages and metallicities. The number of stars with measured magnitudes in each cluster varies from about 3000 to 10000 stars. We build stellar density and surface brightness profiles for the clusters and extract half-light radii and other structural parameters for each. We also obtain luminosity functions, Φ(MV), down to MV≃6 (M/M>0.9), and investigate their dependence with distance from the cluster centre well beyond their half-light radius. In all clusters we find a systematic increase in the luminosity functions slope, ΔlogΦ(MV)/Δ(MV), with radial distance from the centre. Among the clusters displaying significant mass segregation are the 2 youngest in the sample: NGC 1805, NGC 1818. For these two clusters we obtain present day mass functions. The NGC 1818 mass function is in excellent agreement with that derived by other authors, also using HST data. The young cluster mass function slopes differ, that of NGC 1805 being systematically steeper than NGC 1818. Since these are very young stellar systems (τ≲40Myrs), these variations may reflect the initial conditions rather than evolution due to internal dynamics.

Abstract Copyright:

Journal keyword(s): stars: luminosity function, mass function - galaxies: clusters: general - Magellanic Clouds

Simbad objects: 9

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Number of rows : 9
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 HD 268850 AB* 05 02 21.463 -66 06 38.32   11.83 11.55 12.43   ~ 88 0
2 NGC 1805 GlC 05 02 21.690 -66 06 39.43           ~ 106 0
3 NGC 1818 GlC 05 04 13.300 -66 26 05.47           ~ 243 0
4 NGC 1831 GlC 05 06 17.4 -64 55 11   11.52 11.18     ~ 155 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15466 1
6 NGC 1968 As* 05 27 23 -67 28.3   8.29 8.22     ~ 39 0
7 2MASX J05283953-7337514 GlC 05 28 39.531 -73 37 51.45   14.14 13.42     ~ 48 0
8 NGC 2209 GlC 06 08 34 -73 50.5   13.58 13.15     ~ 108 0
9 NAME Hodge 11 GlC 06 14 22.92 -69 50 54.9   12.57 11.93     ~ 102 0

    Equat.    Gal    SGal    Ecl

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2021.07.29-18:36:45

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