INVESTIGADORES
AHUMADA Andrea Veronica
artículos
Título:
Photometric and spectroscopic study of low mass embedded star clusters in reflection nebulae
Autor/es:
SOARES, J. B.; BICA, E.; AHUMADA, A. V.; CLARIÁ, J. J.
Revista:
ASTRONOMY AND ASTROPHYSICS
Editorial:
EDP SCIENCES S A
Referencias:
Lugar: Paris; Año: 2005 vol. 430 p. 987 - 996
ISSN:
0004-6361
Resumen:
An analysis of the candidate embedded stellar systems in the reflection
nebulae vdBH-RN 26, vdBH-RN} 38, vdBH-RN} 53a, GGD 20, ESO 95-RN 18 and
NGC 6595 is presented. Optical spectroscopic data from CASLEO
(Argentina) in conjunction with near infrared photometry from the 2MASS
Point Source Catalogue were employed. The analysis is based on source
surface density, colour-colour and colour-magnitude diagrams together
with theoretical pre-main sequence isochrones. We take into account the
field population affecting the analysis by carrying out a statistical
subtraction. The fundamental parameters for the stellar systems were
derived. The resulting ages are in the range 1-4 Myr and the objects are
dominated by pre-main sequence stars. The observed masses locked in the
clusters are less than 25 Msun. The studied systems have no
stars of spectral types earlier than B, indicating that star clusters do
not necessarily evolve through an HII region phase. The relatively small
locked mass combined with the fact that they are not numerous in
catalogues suggests that these low mass clusters are not important
donors of stars to the field populations.