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Astron. Astrophys. 350, 883-890 (1999)


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ISOCAM observations of the RCrA star formation region *

G. Olofsson 1, M. Huldtgren 1, A.A. Kaas 1, S. Bontemps 1,2, L. Nordh 1, A. Abergel 3, P. André 4, F. Boulanger 3, M. Burgdorf 5, M.M. Casali 6, C.J. Cesarsky 4, J. Davies 10, E. Falgarone 7, T. Montmerle 4, M. Perault 7, P. Persi 8, T. Prusti 5, J.L. Puget 3 and F. Sibille 9

1 Stockholm Observatory, 133 36 Saltsjöbaden, Sweden
2 Observatoire de Bordeaux, Floirac, France
3 IAS, Université Paris XI, Orsay, France
4 Service d'Astrophysique, CEA Saclay, Gif-sur-Yvette, France
5 ISO Data Centre, ESA Astrophysics Division, Villafranca del Castillo, Spain
6 Royal Observatory, Blackford Hill, Edinburgh, UK
7 ENS Radioastronomie, Paris, France
8 IAS, CNR, Rome, Italy
9 Observatoire de Lyon, France
10 Joint Astronomy Center, Hawaii

Received 12 May 1999 / Accepted 8 September 1999

Abstract

The results of an ISOCAM survey of the RCrA star formation region are presented. The survey was carried out in two broad-band filters, LW2 (5-8.5 µm) and LW3 (12-18 µm). Although it was not possible to map the densest, central region due to saturation problems, 21 sources were identified which showed mid-IR excesses. Most of these sources have not previously been recognised as YSOs (Young Stellar Objects), mainly because they are relatively faint. We find evidence for a population of very low mass stars which are probably brown dwarfs in their early contraction phases.

Key words: stars: formation – stars: fundamental parameters – stars: low-mass, brown dwarfs – stars: luminosity function, mass function – stars: pre-main sequence – infrared: stars

* ISO is an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA.

Send offprint requests to: G. Olofsson

Correspondence to: olofsson@astro.su.se

© European Southern Observatory (ESO) 1999

Online publication: October 14, 1999

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