ISOCAM observations of the Chamaeleon I dark cloud
P. Persi, A. R. Marenzi, G. Olofsson, A. A. Kaas, L. Nordh, M. Huldtgren, A. Abergel, P. André, S. Bontemps, F. Boulanger, M. Burggdorf, M. M. Casali, C. J. Cesarsky, E. Copet, J. Davies, E. Falgarone, T. Montmerle, M. Perault, T. Prusti, J. L. Puget, F. Sibille;
AaA, 2000, 357, 219
ABSTRACT:We present the results of an ISOCAM survey of the Chamaeleon I dark cloud conducted in two broad-band filters at 6.7 and 14.3 mu m.
In an area of 0.59
sq.deg.
we have detected a total of 282 mid-IR sources with 103 sources observed in
both filters.
Combining the ISOCAM observations with the I, J, and K_s data
obtained with DENIS, we have found 108 pre-main-sequence (PMS) stars in the
region, of which 34 were previously unidentified.
Several of these newly
discovered young stellar objects are relatively faint suggesting a population in
Cha I of very low mass objects that probably includes brown dwarfs in their
early contraction phases.
Finally, most of the PMS stars show the spectral
index computed between 2.2 and 14.3 mu m typical of Class II sources.
The
luminosity function (LF) derived for our detected PMS stars is discussed.
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.
Tables 1 and 2 are only
available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr
(130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html Tables 3 and 4 are
only available with the on-line publication at
http://link.springer.de/link/service/journals/00230/
KEYWORDS: stars: formation, stars: low-mass, brown dwarfs, stars: luminosity function, mass function, stars: pre-main sequence, infrared: stars
CODE: persi2000