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|Title:||The VISTA Orion mini-survey: star formation in the Lynds 1630 North cloud||Authors:||Spezzi, L.
Petr-Gotzens, M. G.
ALCALA', JUAN MANUEL
Jørgensen, J. K.
Alves, J. F.
|Issue Date:||2015||Journal:||ASTRONOMY & ASTROPHYSICS||Number:||581||First Page:||A140||Abstract:||The Orion cloud complex presents a variety of star formation mechanisms and properties and is still one of the most intriguing targets for star formation studies. We present VISTA/VIRCAM near-infrared observations of the L1630N star-forming region, including the stellar clusters NGC 2068 and NGC 2071 in the Orion molecular cloud B, and discuss them in combination with Spitzer data. We select 186 young stellar object (YSO) candidates in the region on the basis of multi-color criteria, confirm the YSO nature of the majority of them using published spectroscopy from the literature, and use this sample to investigate the overall star formation properties in L1630N. The K-band luminosity function of L1630N is remarkably similar to that of the Trapezium cluster, i.e., it presents a broad peak in the range 0.3-0.7 M<SUB>☉</SUB> and a fraction of substellar objects of ~20%. The fraction of YSOs still surrounded by disk/envelopes is very high (~85%) compared to other star-forming regions of similar age (1-2 Myr), but includes some uncertain corrections for diskless YSOs. Yet, a possibly high disk fraction, together with the fact that 1/3 of the cloud mass has a gas surface density above the threshold for star formation (~129 M<SUB>☉</SUB> pc<SUP>-2</SUP>), points toward a still ongoing star formation activity in L1630N. The star formation efficiency (SFE), star formation rate (SFR), and density of star formation of L1630N are within the ranges estimated for Galactic star-forming regions by the Spitzer core to disk and Gould's Belt surveys. However, the SFE and SFR are lower than the average value measured in the Orion A cloud and, in particular, lower than that in the southern regions of L1630. This might suggest different star formation mechanisms within the L1630 cloud complex. <P />Based on observations collected at the ESO La Silla Paranal Observatory under programme ID 060.A-9285(B).Tables A.1 and A.2 are are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://22.214.171.124) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/581/A140">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/581/A140</A>||Acknowledgments:||We thank the anonymous referee for valuable comments that further improved the clarity of the paper. J.M.A. acknowledges financial support from INAF under the program PRIN2013 “Disk jets and the dawn of planets”. This research has made use of the SIMBAD database operated at CDS, Strasbourg, France. It also makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. We greatly appreciate the work done by the UK-based VISTA consortium who built and commissioned the VISTA telescope and camera.||URI:||http://hdl.handle.net/20.500.12386/23134||URL:||https://www.aanda.org/articles/aa/abs/2015/09/aa25417-14/aa25417-14.html||ISSN:||0004-6361||DOI:||10.1051/0004-6361/201425417||Bibcode ADS:||2015A&A...581A.140S||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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