Bibcode
Lodieu, N.
Referencia bibliográfica
Astronomische Nachrichten, Vol.326, Issue 10, p.1001-1006
Fecha de publicación:
12
2005
Número de citas
0
Número de citas referidas
0
Descripción
We present the first deep, optical, wide-field imaging survey of the
young open cluster Collinder 359, complemented by near-infrared
follow-up observations. This study is part of a large programme aimed at
examining the dependence of the mass function on environment and time.
We have surveyed 1.6 square degree in the cluster in the I and z filters
with the CFH12K camera on the Canada-France-Hawaii 3.6m telescope down
to completeness and detection limits in both filters of 22fm0 and
24fm0, respectively. Based on their location in the optical (I-z,I)
colour-magnitude diagram, we have extracted new cluster member
candidates in Collinder 359 spanning 1.3-0.04 M&sun;,
assuming an age of 100 Myr and a distance of 450 pc for the cluster. We
have used the 2MASS database as well as our own near-infrared photometry
to confirm the membership of the optically-selected cluster candidates.
Additionally, we have obtained optical spectroscopy and employed
chromospheric activity as a further criterion to assess the membership
of candidates.