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Astron. Astrophys. 330, 990-998 (1998)

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Deep optical and near infrared imaging photometry
of the Serpens cloud core *

P. Giovannetti 1, E. Caux 1, D. Nadeau 2 and J.-L. Monin 3

1 Centre d'Etude Spatiale des Rayonnements, 9 avenue du Colonel Roche, BP 4346, F-31028 Toulouse Cedex 04, France
2 Observatoire du Mont Megantic et Département de Physique, Université de Montréal, C.P. 6128, Succ. A. Montréal, H3C 3J7 Québec, Canada
3 Laboratoire d'Astrophysique, Observatoire de Grenoble, Université Joseph Fourier, BP 53, F-38041 Grenoble Cedex, France

Received 2 June 1997 / Accepted 20 August 1997


We present results from a deep optical (VRI) and near infrared (JHK) survey of the central part of the Serpens molecular cloud. A total of 138 sources were detected in the 19 arcmin2 surveyed area down to a limiting magnitude of 16.3 in K. We find that the form of the observed K Luminosity Function (KLF) of stars belonging to the Serpens Molecular cloud is consistent with that predicted from a Miller & Scalo (1979) Interstellar Mass Function (IMF). We have investigated the KLF evolution with the age of a cluster by modeling KLFs of hypothetical clusters. Our results suggest that two phases of star formation could have taken place in the Serpens core.

Key words: stars: pre-main sequence – ISM: open clusters: Serpens cloud – stars: luminosity function – infrared: stars – star formation

* Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsweb.u-strasbg.fr/Abstract.html

Send offprint requests to: P. Giovannetti, giova@cesr.cnes.fr

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© European Southern Observatory (ESO) 1998

Online publication: January 27, 1998