The Spitzer c2d Survey Of Large, Nearby, Interstellar Clouds. X. The Chamaeleon II Pre-Main-Sequence Population As Observed With IRAC And MIPS

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dc.contributor.utaustinauthorEvans, Neal J.en_US
dc.creatorAlcala, Juan M.en_US
dc.creatorSpezzi, Loredanaen_US
dc.creatorChapman, Nicholasen_US
dc.creatorEvans, Neal J.en_US
dc.creatorHuard, Tracy L.en_US
dc.creatorJorgensen, Jes K.en_US
dc.creatorMerin, Brunoen_US
dc.creatorStapelfeldt, Karl R.en_US
dc.creatorCovino, E.en_US
dc.creatorFrasca, Antonioen_US
dc.creatorGandolfi, Davideen_US
dc.creatorOliveira, Isaen_US
dc.date.accessioned2016-04-28T19:31:28Z
dc.date.available2016-04-28T19:31:28Z
dc.date.issued2008-03en
dc.description.abstractWe discuss the results from the combined IRAC and MIPS c2d Spitzer Legacy survey observations and complementary optical and NIR data of the Chamaeleon II (Cha II) dark cloud. We perform a census of the young population in an area of similar to 1.75 deg(2) and study the spatial distribution and properties of the cloud members and candidate pre-main-sequence (PMS) objects and their circumstellar matter. Our census is complete down to the substellar regime (M approximate to 0.03 M-circle dot). From the analysis of the volume density of the PMS objects and candidates we find two groups of objects with volume densities higher than 25 M-circle dot pc(-3) and 5-10 members each. A multiplicity fraction of about 13% +/- 3% is observed for objects with separations 0.8 '' < theta < 6.0 '' (142-1065 AU). No evidence for variability between the two epochs of the c2d IRAC data set, Delta t similar to 6 hr, is detected. We estimate a star formation efficiency of 1%-4%, consistent with the estimates for Taurus and Lupus, but lower than for Cha I. This might mean that different star formation activities in the Chamaeleon clouds reflect a different history of star formation. We also find that Cha II is turning some 6-7 M-circle dot into stars every Myr, which is low in comparison with the star formation rate in other c2d clouds. The disk fraction of 70%-80% that we estimate in Cha II is much higher than in other star-forming regions and indicates that the population in this cloud is dominated by objects with active accretion. Finally, the Cha II outflows are discussed; a new Herbig-Haro outflow, HH 939, driven by the classical T Tauri star Sz 50, has been discovered.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNASA 1224608en_US
dc.description.sponsorshipIstituto Nazionale di Astrofisica PRIN-INAF-2005en_US
dc.identifierdoi:10.15781/T2R50M
dc.identifier.Filename2008_03_spitzerx.pdfen_US
dc.identifier.citationAlcal�, Juan M., Loredana Spezzi, Nicholas Chapman, Neal J. Evans II, Tracy L. Huard, Jes K. J�rgensen, Bruno Mer�n et al. "The Spitzer c2d survey of large, nearby, interstellar clouds. X. The Chamaeleon II pre-main-sequence population as observed with IRAC and MIPS." The Astrophysical Journal, Vol. 676, No. 1 (Mar., 2008): 427.en_US
dc.identifier.doi10.1086/527315en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34635
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.rights.restrictionOpenen_US
dc.subjectcircumstellar matteren_US
dc.subjectinfrared : starsen_US
dc.subjectplanetary systems :en_US
dc.subjectprotoplanetary disksen_US
dc.subjectstars : formationen_US
dc.subjectstars : low-massen_US
dc.subjectbrown dwarfsen_US
dc.subjectstars : pre-main-sequenceen_US
dc.subjectt-tauri starsen_US
dc.subjectspectral energy-distributionsen_US
dc.subjectyoung stellar objectsen_US
dc.subjectherbig-haro objectsen_US
dc.subjectall-sky surveyen_US
dc.subjectmass-loss ratesen_US
dc.subjectdark-clouden_US
dc.subjectmolecular cloudsen_US
dc.subjectforming regionen_US
dc.subjectbrown dwarfen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Spitzer c2d Survey Of Large, Nearby, Interstellar Clouds. X. The Chamaeleon II Pre-Main-Sequence Population As Observed With IRAC And MIPSen_US
dc.typeReviewen_US

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