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Low mass T Tauri and young brown dwarf candidates in the Chamaeleon II dark cloud found by DENIS

Vuong, M. H. and Cambrésy, L. and Epchtein, N. (2001) Low mass T Tauri and young brown dwarf candidates in the Chamaeleon II dark cloud found by DENIS. Astronomy & Astrophysics, 379 (1). pp. 208-214. ISSN 0004-6361. https://resolver.caltech.edu/CaltechAUTHORS:20180226-081547719

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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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1051/0004-6361:20011259DOIArticle
https://www.aanda.org/articles/aa/abs/2001/43/aa1463/aa1463.htmlPublisherArticle
https://arxiv.org/abs/astro-ph/0109427arXivDiscussion Paper
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.
Group:Infrared Processing and Analysis Center (IPAC)
Funders:
Funding AgencyGrant Number
European CommissionUNSPECIFIED
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Baden-WürtenbergUNSPECIFIED
Departmento Governmental de Investigaciónes Cientificas y Técnológicas (DGICYT)UNSPECIFIED
Consiglio Nazionale delle Ricerche (CNR)UNSPECIFIED
FWF Der WissenschaftsfondsUNSPECIFIED
Bundesministerium für Wissenschaft und Forschung (BMBF)UNSPECIFIED
Subject Keywords:ISM: clouds - ISM: dust, extinction - ISM: individual objects: Chamaeleon
Issue or Number:1
Record Number:CaltechAUTHORS:20180226-081547719
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180226-081547719
Official Citation:Low mass T Tauri and young brown dwarf candidates in the Chamaeleon II dark cloud found by DENIS M. H. Vuong, L. Cambrésy and N. Epchtein A&A, 379 1 (2001) 208-214 DOI: https://doi.org/10.1051/0004-6361:20011259
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84948
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:26 Feb 2018 19:09
Last Modified:03 Oct 2019 19:24

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