Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..205m&link_type=abstract
In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M
Astronomy and Astrophysics
Astrophysics
Agb, Mira Variables, Carbon Stars, Leo I, Local Group, Logroup
Scientific paper
The first results of a study of the dwarf spheroidal galaxy, Leo I, using the new Japanese-South African Infrared Survey Facility (IRSF) are presented. J, H, Ks observations show that most, if not all, of at least the top one magnitude of the AGB is populated by carbon stars. These objects form a tight sequence in the Ks,(J-Ks) plane. In addition there are five very red objects which are believed to be dust enshrouded AGB stars. They have Mbol near -5.0 and are at the AGB tip. Comparison with carbon Miras in Magellanic Cloud clusters and taking into account other evidence on the ages and metallicities of Leo I populations suggests that these obscured stars belong to the youngest significant population of Leo I and have ages of ~2 Gyr. Some of them can be shown to be variable.
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