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Infrared imaging of intermediate age LMC/SMC clusters

Published online by Cambridge University Press:  19 July 2016

H. Zinnecker ,
F. Ferraro ,
F. Fusi Pecci ,
Alvio Renzini ,
R. Buonanno ,
C.E. Corsi  and
D.M. Terndrup
H. Zinnecker
Affiliation:
University of Würzburg, Germany
F. Ferraro
Affiliation:
ESO Garching, Germany
F. Fusi Pecci
Affiliation:
University of Bologna, Italy
Alvio Renzini
Affiliation:
University of Bologna, Italy
R. Buonanno
Affiliation:
Astronomical Observatory of Rome, Italy
C.E. Corsi
Affiliation:
Astronomical Observatory of Rome, Italy
D.M. Terndrup
Affiliation:
Ohio State University, USA

Abstract

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Infrared colour-magnitude diagrams (K vs. J-K) have been obtained for eight intermediate age (˜0.1-1 Gyr) Large Magellanic Cloud (LMC) clusters and one Small Magellanic Cloud (SMC) cluster (NGC 419). The data have been obtained from infrared array camera images taken at the CTIO 1.5m telescope and reduced using the software package ROMAFOT. We believe that we have observed the onset of the extended red giant branch, i.e. the discontinuous change in the infrared colour and in the number of infrared bright stars per unit optical cluster luminosity. The most luminous stars (K = 10-12.5) must be on the asymptotic giant branch; some of them are very red (J - K > 1.5) and must be carbon stars.

Type
Star Formation and Clustering
Information
Symposium - International Astronomical Union , Volume 148: The Magellanic Clouds , 1991 , pp. 228 - 229
Copyright
Copyright © Kluwer 1991 

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