Journal article

The age of the large magellanic cloud cluster NGC 1953

JR Mould, DA Xystus, GS Costa, RA Schommer

The Astrophysical Journal | Published : 1993


NGC 1953 is a globular cluster in the Large Magellanic Cloud. A color-magnitude diagram (C-M) is fitted with appropriate isochrones which indicate that the age of the cluster is 250 ± 50 million years. The C-M diagram also suggests that this cluster may contain a number of Cepheid variables. Spectroscopic observations reveal that the most luminous asymptotic giant branch star in the cluster is an S star, thus observationally confirming that the third dredge-up mechanism does occur in stars with initial masses at least as large as 3.4 M⊙. The spectrum of this AGB star also shows Balmer lines in emission, indicative of mass loss, and thus it is likely that the evolution of this star on the AGB..

View full abstract

University of Melbourne Researchers

Citation metrics