J/ApJ/764/114ivo://CDS.VizieR/J/ApJ/764/114doi:10.26093/cds/vizier.17640114CDSHsu W.-H.Hartmann L.Allen L.Hernandez J.Megeath S.T.Tobin J.J.,Ingleby L.2017-10-16T14:58:31Z2014-11-19T13:51:39ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomybroad-band-photometryradial-velocitystellar-spectral-typesyoung-stellar-objectsWe extend our previous study of the stellar population of L1641, the lower-density star-forming region of the Orion A cloud south of the dense Orion Nebula Cluster (ONC), with the goal of testing whether there is a statistically significant deficiency of high-mass stars in low-density regions. Previously, we compared the observed ratio of low-mass stars to high-mass stars with theoretical models of the stellar initial mass function (IMF) to infer a deficiency of the highest-mass stars in L1641. We expand our population study to identify the intermediate-mass (late B to G) L1641 members in an attempt to make a more direct comparison with the mass function of the nearby ONC. The spectral-type distribution and the K-band luminosity function of L1641 are similar to those of the ONC, but problems of incompleteness and contamination prevent us from making a detailed test for differences. We limit our analysis to statistical tests of the ratio of high-mass to low-mass stars, which indicate a probability of only 3% that the ONC and the southern region of L1641 were drawn from the same population, supporting the hypothesis that the upper-mass end of the IMF is dependent on environmental density.2013ApJ...764..114Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/764/114CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/322 : UCAC4 Catalogue (Zacharias+, 2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/564/A29 : Optical and near-infrared photometry in Orion A (Bouy+, 2014)J/ApJS/208/28 : H{alpha} survey in the ONC (Szegedi-Elek+, 2013)J/ApJS/207/10 : HST Treasury Program on the ONC (Robberto+, 2013)J/AJ/146/85 : Spectral types of optical stars in ONC (Hillenbrand+, 2013)J/ApJ/755/154 : Mass accretion rates from HST in the ONC (Manara+, 2012)J/ApJ/752/59 : Paper I: Low-mass population in L1641 (Hsu+, 2012)J/AJ/144/192 : Spitzer survey of Orion A and B. I. YSO cat. (Megeath+, 2012)J/AJ/144/31 : Spitzer+2MASS photometry of protostar cand. (Kryukova+, 2012)J/AJ/142/60 : Palomar Transient Factory Orion Project (Van Eyken+, 2011)J/ApJ/733/50 : MIR phot. monitoring of the ONC (Morales-Calderon+, 2011)J/ApJ/722/1092 : Optical photometry of the ONC. II. (Da Rio+, 2010)J/A+A/504/461 : YSOs in L1630N and L1641 (Fang+, 2009)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/AJ/121/1676 : ONC low-mass stars photometry (Rebull+, 2001)J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/764/114https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/764/114http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/764/114https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/764/114https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/764/114http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/764/114GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/764/114/table1 (Intermediate-mass members of L1641)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/764/114/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/764/114/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/764/114/table1?GETtext/xml+votable180.050000true83.31498-6.109560.005555555555555556Cone search capability for table J/ApJ/764/114/table2 (Non-members of L1641 observed with OSMOS)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/764/114/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/764/114/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/764/114/table2?GETtext/xml+votable180.050000true83.2489-6.117340.0055555555555555566/21402 21403 21406 21425 21427 21428 21430 21433 21435 21436 214388.650015785639275e-20 4.920466254354166e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/764/114?format=asciiInfraredOpticaldefaultJ/ApJ/764/114/table1Intermediate-mass members of L1641SimbadNameSimbad column added by the CDSmeta.idcharSeqRunning sequence numbermeta.id;meta.mainintprimaryn_SeqNote(s) on Seq (2)meta.notecharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainBmag[4.5/16.7]? The Johnson B band magnitudemagphot.mag;em.opt.BfloatnullableVmag? The Johnson V band magnitudemagphot.mag;em.opt.VfloatnullableRmag? The Cousins R band magnitudemagphot.mag;em.opt.RfloatnullableImag[8.4/12.5]? The Cousins Ic band magnitudemagphot.mag;em.opt.IfloatnullableJmag2MASS J band magnitudemagphot.mag;em.IR.JfloatHmag2MASS H band magnitudemagphot.mag;em.IR.HfloatKsmag[3.2/10.4] 2MASS Ks band magnitudemagphot.mag;em.IR.KfloatSpTMK spectral typesrc.spTypechare_SpT? Uncertainty in SpTypestat.errorfloatnullableIRex[NY] IR excess? (1)meta.codecharRVel[-18.5/138]? Radial velocity from Magellan/MIKE echelle datakm/sspect.dopplerVeloc;pos.heliocentricfloatnullableW(Li)[0/0.2]? Equivalent width of Li; in Angstroms from Magellan/MIKE echelle data0.1nmspect.line.eqWidthfloatnullable2MDisplay the 2MASS data within 3" (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharJ/ApJ/764/114/table2Non-members of L1641 observed with OSMOSSimbadNameSimbad column added by the CDSmeta.idcharSeqRunning sequence numbermeta.id;meta.mainintprimaryn_SeqNote(s) on Seq (2)meta.notecharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainBmag[4.5/16.7]? The Johnson B band magnitudemagphot.mag;em.opt.BfloatnullableVmag? The Johnson V band magnitudemagphot.mag;em.opt.VfloatnullableRmag? The Cousins R band magnitudemagphot.mag;em.opt.RfloatnullableImag[8.4/12.5]? The Cousins Ic band magnitudemagphot.mag;em.opt.IfloatnullableJmag2MASS J band magnitudemagphot.mag;em.IR.JfloatHmag2MASS H band magnitudemagphot.mag;em.IR.HfloatKsmag[3.2/10.4] 2MASS Ks band magnitudemagphot.mag;em.IR.KfloatSpTMK spectral typesrc.spTypechare_SpT? Uncertainty in SpTypestat.errorfloatnullableIRex[NY] IR excess? (1)meta.codecharRVel[-18.5/138]? Radial velocity from Magellan/MIKE echelle datakm/sspect.dopplerVeloc;pos.heliocentricfloatnullableW(Li)[0/0.2]? Equivalent width of Li; in Angstroms from Magellan/MIKE echelle data0.1nmspect.line.eqWidthfloatnullable2MDisplay the 2MASS data within 3" (Cutri et al. 2003, Cat. II/246)meta.ref.urlchar