J/MNRAS/469/3881ivo://CDS.VizieR/J/MNRAS/469/3881doi:10.26093/cds/vizier.74693881CDSSadavoy S.I.Stahler S.W.2024-08-17T20:19:27Z2020-06-02T10:16:40ZCDS support team

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

cds-question@unistra.frmolecular-cloudsmultiple-starsmillimeter-astronomyphotometrysubmillimeter-astronomyWe explore the relationship between young, embedded binaries and their parent cores, using observations within the Perseus Molecular Cloud. We combine recently published Very Large Array observations of young stars with core properties obtained from Submillimetre Common-User Bolometer Array 2 observations at 850{mu}m. Most embedded binary systems are found towards the centres of their parent cores, although several systems have components closer to the core edge. Wide binaries, defined as those systems with physical separations greater than 500au, show a tendency to be aligned with the long axes of their parent cores, whereas tight binaries show no preferred orientation. We test a number of simple, evolutionary models to account for the observed populations of Class 0 and I sources, both single and binary. In the model that best explains the observations, all stars form initially as wide binaries. These binaries either break up into separate stars or else shrink into tighter orbits. Under the assumption that both stars remain embedded following binary break-up, we find a total star formation rate of 168Myr^-1^. Alternatively, one star may be ejected from the dense core due to binary break-up. This latter assumption results in a star formation rate of 247Myr^-1^. Both production rates are in satisfactory agreement with current estimates from other studies of Perseus. Future observations should be able to distinguish between these two possibilities. If our model continues to provide a good fit to other star-forming regions, then the mass fraction of dense cores that becomes stars is double what is currently believed.2017MNRAS.469.3881Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/469/3881CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/818/73 : Study of protostars in Perseus molecular cloud (Tobin+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/469/3881https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/469/3881http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/469/3881https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/469/3881https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/469/3881http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/469/3881GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/469/3881/table2 (Dense cores associated with embedded multiples)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/469/3881/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/469/3881/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/469/3881/table2?GETtext/xml+votable180.050000true51.28958330.7727780.0055555555555555566/859-860 862 881 15392.3390025583187276e-22 2.3390025583187276e-22https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/469/3881?format=asciiMillimeterdefaultJ/MNRAS/469/3881/table2Dense cores associated with embedded multiplesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCoreIdCore number, SC2_NNmeta.idcharn_CoreId[b] Note on CoreId (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpeakPeak 850um fluxmJy.arcsec**-2phot.flux.density;em.mm.200-400GHzfloatStotTotal 850um flux densityJyphot.flux.density;em.mm.200-400GHzfloatamajSemimajor axisarcsecphys.angSize;srcfloatBminSemiminor axisarcsecphys.angSize.sminAxisfloatthetaPosition angledegpos.posAngintJ/MNRAS/469/3881/table1Embedded binary systemsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSourceSource name, Taken from Tobin et al. (2016, Cat. J/ApJ/818/73),meta.id;meta.maincharn_Source[d] Note on Source (1)meta.notecharClassClass, Taken from Tobin et al. (2016, Cat. J/ApJ/818/73) (2)src.classcharn_Class[d] Note on Class (1)meta.notecharDSeparation between each embedded source and the core centre (3)AUpos.distanceintCoreNameCore IAU designation, JCMTLSG JHHMMSS.s+DDMMSSmeta.id.assoccharCoreIdCore identification number, SC2_NN (4)meta.idchar