J/A+A/581/A140ivo://CDS.VizieR/J/A+A/581/A140doi:10.26093/cds/vizier.35810140CDSSpezzi L.Petr-Gotzens M.G.Alcala J.M.Jorgensen J.K.Stanke T.,Lombardi M.Alves J.F.2017-11-06T12:24:15Z2015-09-24T08:57:30ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmolecular-cloudsinfrared-photometryThe 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 0.3-0.7M_{sun}_ 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 (1-2Myr), 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 (~129M_{sun}_/pc^2^), 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.2015A&A...581A.140Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/581/A140CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)J/AJ/135/966 : Circumstellar disk evolution in NGC 2068/71 (Flaherty+, 2008)J/A+A/504/461 : YSOs in L1630N and L1641 (Fang+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/581/A140https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/581/A140http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/581/A140https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/581/A140https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/581/A140http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/581/A140GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/581/A140/tablea2 (VISTA and Spitzer observed magnitudes for the YSO candidates in L1630 N)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/581/A140/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/581/A140/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/581/A140/tablea2?GETtext/xml+votable180.050000true87.01666250.06141670.0055555555555555566/22867 22873 22875-228768.27688880188539e-21 2.393642124494231e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/581/A140?format=asciiInfrareddefaultJ/A+A/581/A140/tablea1Theoretical isochrones from Baraffe et al. (1998A&A...337..403B, Cat. J/A+A/337/403) and Chabrier et al. (2000ApJ...542..464C) converted into the VISTA photometric systemrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAgeAge (1)time.agecharMassMasssolMassphys.massfloatTeffEffective temperatureKphys.temperature.effectiveintZmagDNextGen/AMES-Dusty model Z magnitude (2)magphot.mag;meta.modelledfloatYmagDNextGen/AMES-Dusty model Y magnitude (2)magphot.mag;meta.modelledfloatJmagDNextGen/AMES-Dusty model J magnitude (2)magphot.mag;meta.modelledfloatHmagDNextGen/AMES-Dusty model H magnitude (2)magphot.mag;meta.modelledfloatKsmagDNextGen/AMES-Dusty model Ks magnitude (2)magphot.mag;meta.modelledfloatZmagCNextGen/AMES-Cond model Z magnitude (2)magphot.mag;meta.modelledfloatYmagCNextGen/AMES-Cond model Y magnitude (2)magphot.mag;meta.modelledfloatJmagCNextGen/AMES-Cond model J magnitude (2)magphot.mag;meta.modelledfloatHmagCNextGen/AMES-Cond model H magnitude (2)magphot.mag;meta.modelledfloatKsmagCNextGen/AMES-Cond model Ks magnitude (2)magphot.mag;meta.modelledfloatJ/A+A/581/A140/tablea2VISTA and Spitzer observed magnitudes for the YSO candidates in L1630 NIDSequential numbermeta.idintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (HHMMSS.sss+DDMMSS.ss)meta.id;meta.maincharPrevObject previously identified (1)meta.codecharClassLada class (2)src.classcharl_ZmagUpper limit flag to the actual brightness of the object on Zmagmeta.code.errorcharZmag? VISTA Z magnitude (3)magphot.mag;em.opt.Ifloatnullablee_Zmag? rms uncertainty on Zmagmagstat.error;phot.mag;em.opt.Ifloatnullablel_YmagUpper limit flag to the actual brightness of the object on Ymagmeta.code.error;pos.cartesian.ycharYmag? VISTA Y magnitude (3)magphot.mag;em.IR.Jfloatnullablee_Ymag? rms uncertainty on Ymagmagstat.error;phot.mag;em.opt.Bfloatnullablel_JmagUpper limit flag to the actual brightness of the object on Jmagmeta.code.errorcharJmag? VISTA J magnitude (3)magphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.Jfloatnullablel_HmagUpper limit flag to the actual brightness of the object on Hmagmeta.code.errorcharHmagVISTA H magnitudemagphot.mag;em.IR.Hfloate_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.Hfloatnullablel_KsmagUpper limit flag to the actual brightness of the object on Ksmagmeta.code.errorcharKsmagVISTA Ks magnitudemagphot.mag;em.IR.Kfloate_Ksmag? rms uncertainty on Ksmagmagstat.error;phot.mag;em.IR.Kfloatnullable[3.6]IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloate_[3.6]rms uncertainty on [3.6]magstat.errorfloat[4.5]IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloate_[4.5]rms uncertainty on [4.5]magstat.errorfloat[5.8]IRAC 5.8um magnitudemagphot.flux.density;em.IR.4-8umfloate_[5.8]rms uncertainty on [5.8]magstat.errorfloat[8.0]IRAC 8.0um magnitudemagphot.flux.density;em.IR.8-15umfloate_[8.0]rms uncertainty on [8.0]magstat.errorfloat[24]MIPS 24um magnitudemagphot.flux.density;em.IR.15-30umfloate_[24]rms uncertainty on [24]magstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from Name (right ascension part)degpos.eq.ra;meta.main_DEPositions from Name (declination part)degpos.eq.dec;meta.main