Issue |
A&A
Volume 430, Number 3, February II 2005
|
|
---|---|---|
Page(s) | 987 - 996 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20048242 | |
Published online | 26 January 2005 |
Photometric and spectroscopic study of low mass embedded star clusters in reflection nebulae*
1
Universidade Federal do Rio Grande do Sul, IF, CP 15051, Porto Alegre 91501–970, RS, Brazil e-mail: jules@if.ufrgs.br
2
Observatorio Astronómico de Córdoba, Laprida 854, 5000, Córdoba, Argentina
Received:
6
May
2004
Accepted:
11
October
2004
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 . 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.
Key words: open clusters and associations: individual: GGD 20 / open clusters and associations: individual: vdBH-RN 26 / open clusters and associations: individual: vdBH-RN 38 / open clusters and associations: individual: vdBH-RN 53a / open clusters and associations: individual: ESO 95-RN 18 / open clusters and associations: individual: NGC 6595
© ESO, 2005
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