EDP Sciences
Free access
Volume 440, Number 1, September II 2005
Page(s) 139 - 149
Section Galactic structure, stellar clusters and populations
DOI http://dx.doi.org/10.1051/0004-6361:20042299

A&A 440, 139-149 (2005)
DOI: 10.1051/0004-6361:20042299

Very low-mass members of the Lupus 3 cloud

B. López Martí1, J. Eislöffel2 and R. Mundt3

1  Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Martí i Franquès 1, 08028 Barcelona, Spain
    e-mail: blopez@am.ub.es
2  Thüringer Landessternwarte, Sternwarte 5, 07778 Tautenburg, Germany
    e-mail: jochen@tls-tautenburg.de
3  Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
    e-mail: mundt@mpia-hd.mpg.de

(Received 2 November 2004 / Accepted 4 May 2005)

We report on a multi-band survey for very low-mass stars and brown dwarfs in the Lupus 3 cloud with the Wide Field Imager (WFI) at the ESO/MPG 2.2 m telescope on La Silla Observatory (Chile). Our multiband optical photometry is combined with available 2MASS JHK photometry to identify 19 new young stars and 3 brown dwarf candidates as probable members of this star forming region. Our objects are mostly clustered around the cloud core. Stars and brown dwarfs have similar levels of H$\alpha$ emission, probably a signature of accretion. One object, a brown dwarf candidate, exhibits a near-infrared excess, which may indicate the presence of a disk, but its H$\alpha$ emission cannot be confirmed due to its faintness in the optical passbands. We also find two visual pairs of probable Lupus 3 members that may be wide binaries.

Key words: stars: low-mass, brown dwarfs -- stars: pre-main sequence -- stars: formation -- stars: luminosity function, mass function -- stars: circumstellar matter

SIMBAD Objects

© ESO 2005