J/AJ/115/592 J/AJ/115/592 VI photometry of NGC 2157 P Fischer C Pryor S Murray M Mateo T Richtler Astron. J. 115 592 1998 1998AJ....115..592F VII/183 : Cluster System of the LMC (Kontizas+ 1990) Clusters, open Magellanic Clouds Photometry, VRI galaxies: star clusters globular clusters: individual (NGC 2157) Magellanic Clouds We have carried out Wide Field Planetary Camera 2 V- and I-band imaging of the young LMC cluster NGC 2157. Construction of a color-magnitude diagram and isochrone fitting yield an age of {tau}=10^8^yr, a reddening E(B-V)=0.1, and a distance modulus of 18.4mag. Our data cover the mass range 0.75M_{sun}_<=m<=5.1M_{sun}_. We find that the cluster mass function changes significantly from the inner regions to the outer regions, becoming steeper (larger number of low-mass stars relative to high-mass stars) at larger radii. The age of NGC 2157 is comparable to its two-body relaxation timescale only in the cluster core. The observed steepening of the mass function at larger radii is therefore most likely an initial condition of the cluster stars. Such initial conditions are predicted in models of cluster star formation in which dissipative processes act more strongly upon more massive stars.

HST NGC 215705 57 35.0-69 11 48

Seq Sequential number --- xpos x position number=1 The cluster center is located in the Planetary Camera (PC) frame. pix ypos y position number=1 The cluster center is located in the Planetary Camera (PC) frame. pix V0 Dereddenned V magnitude number=2 Reddening correction of E(B-V)=0.1. mag e_V0 rms uncertainty on V0 mag (V-I)0 Dereddenned V-I index number=2 Reddening correction of E(B-V)=0.1. mag e_(V-I)0 rms uncertainty on (V-I)0 mag James Marcout, Patricia Bauer CDS 1999Mar09 UNKNOWN UNKNOWN From AJ electronic version J_AJ_115_592.xml