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Infrared imaging of intermediate age LMC/SMC clusters

  • H. Zinnecker (a1), F. Ferraro (a2), F. Fusi Pecci (a3), Alvio Renzini (a3), R. Buonanno (a4), C.E. Corsi (a4) and D.M. Terndrup (a5)...

Abstract

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.

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References

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Aaronson, M., Mould, J. (1985), Astrophys. J. 288, 551.
Buonanno, R., Corsi, C.E., Fusi Pecci, F., Greggio, L., Renzini, A., Sweigart, A.V. (1990), in prep.
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Sweigart, A.V., Greggio, L., Renzini, A. (1990), Astrophys. J. in press.

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