The Age of the Large Magellanic Cloud Cluster NGC 1953

Details The Age of the Large Magellanic Cloud Cluster NGC 1953 The Age of the Large Magellanic Cloud Cluster NGC 1953

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...416..582m&link_type=abstract

Astrophysical Journal v.416, p.582

Astronomy and Astrophysics

Astronomy

2

Globular Clusters: Individual (Ngc 1953) -- Magellanic Clouds -- Stars: Agb And Post-Agb Stars: Evolution

Scientific paper

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 Msun. 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 will terminate before the transition from M star to C star is completed.

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