Bibcode
Tapia, M.; Roth, M.; Vázquez, R. A.; Persi, P.
Referencia bibliográfica
Gravitational Collapse: From Massive Stars to Planets. / First Astrophysics meeting of the Observatorio Astronomico Nacional. / A meeting to celebrate Peter Bodenheimer for his outstanding contributions to Astrophysics. (Eds. G. García-Segura, G. Tenorio-Tagle, J. Franco, & H. W. Yorke) Revista Mexicana de Astronomía y Astrofísica (Serie de Conferencias) Vol. 22, pp. 73-76 (2004) (http://www.astroscu.unam.mx/~rmaa/)
Fecha de publicación:
12
2004
Número de citas
2
Número de citas referidas
1
Descripción
Results are presented of a large-scale imaging photometric study of the
stellar population in the northern part of NGC 3372 with a wavelength
coverage from 0.33 to 2.5 μ m. All observations were made at Las
Campanas Observatory. The sizes of the three stellar clusters, Tr 14, Tr
15 and Tr 16, were determined by means of star counts. Two-colour and
colour-magnitude diagrams are presented and analyzed for each individual
cluster. The three clusters were found to be at a similar distance from
the Sun, < d > = 2.7 kpc, but with very large scatter in both A[V]
and d. suggesting drastic variations in intracluster dust density. Dust
particle size distribution variations are evident resulting in wide
variations in extinction law. We determined ages between 3 and 60
million years for Tr 15 and between less than 1 and 6 million years for
Tr 14 and Tr 16. The Tr 14 cluster is partially embedded in a dense
molecular cloud that extends towards the southwest reaching its highest
density some three arcmin from the cluster nucleus. The rich UV field
created by the Tr14 stars ionizes most of the visible HII region in its
vicinity and most of the radio HII region Car I. Deep JHK images of the
Car I region reveal the presence of a young, embedded stellar population
that includes several O9-B0 stars and an ultracompact HII region.