Low mass T Tauri and young brown dwarf candidates in the Chamaeleon II dark cloud found by DENIS
- Creators
- Vuong, M. H.
- Cambrésy, L.
- Epchtein, N.
Abstract
We define a sample designed to select low-mass T Tauri stars and young brown dwarfs using DENIS data in the Chamaeleon II molecular cloud. We use a star count method to construct an extinction map of the Chamaeleon II cloud. We select our low-mass T Tauri star and young brown dwarf candidates by their strong infrared color excess in the I - J/J - K_s color-color dereddened diagram. We retain only objects with colors I - J ≥ 2, and spatially distributed in groups around the cloud cores. This provides a sample of 70 stars of which 4 are previously known T Tauri stars. We have carefully checked the reliability of all these objects by visual inspection of the DENIS images. Thanks to the association of the optical I band to the infra-red J and Ks bands in DENIS, we can apply this selection method to all star formation regions observed in the southern hemisphere. We also identify six DENIS sources with X-ray sources detected by ROSAT. Assuming that they are reliable low-mass candidates and using the evolutionary models for low-mass stars, we estimate the age of these sources between 1 Myr and <10 Myr.
Additional Information
© ESO 2001. Received: 11 May 2001. Accepted: 5 September 2001. We are grateful to Dr. T. Montmerle for his helpful comments and to the anonymous referee for suggestions that improved this paper markedly. We warmly thank the members of the DENIS consortium whose work made these results possible. The DENIS project is partly funded by the European Commission through SCIENCE and Human Capital and Mobility grants. It is also supported in France by INSU, the Education Ministry and CNRS, in Germany by the Land of Baden-Würtenberg, in Spain by DGICYT, in Italy by CNR, in Austria by the Fonds zur Förderung der Wissenschaftlichen Forschung and Bundesministerium für Wissenschaft und Forschung.Attached Files
Published - aa1463.pdf
Submitted - 0109427.pdf
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Additional details
- Eprint ID
- 84948
- Resolver ID
- CaltechAUTHORS:20180226-081547719
- European Commission
- Institut national des sciences de l'Univers (INSU)
- Centre National de la Recherche Scientifique (CNRS)
- Baden-Würtenberg
- Departmento Governmental de Investigaciónes Cientificas y Técnológicas (DGICYT)
- Consiglio Nazionale delle Ricerche (CNR)
- FWF Der Wissenschaftsfonds
- Bundesministerium für Wissenschaft und Forschung (BMBF)
- Created
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2018-02-26Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)