J/A+A/620/A30ivo://CDS.VizieR/J/A+A/620/A30doi:10.26093/cds/vizier.36200030CDSMurillo N.M.van Dishoeck E.F.Tobin J.J.Mottram J.C.Karska A.2020-01-29T09:12:18Z2018-11-23T10:19:06ZCDS support team

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

cds-question@unistra.frinterstellar-mediumprotostarsyoung-stellar-objectsspectroscopySimulations suggest that gas heating due to radiative feedback is a key factor in whether or not multiple protostellar systems will form. Chemistry is a good tracer of the physical structure of a protostellar system, since it depends on the temperature structure. We aim to study the relationship between envelope gas temperature and protostellar multiplicity. Single dish observations of various molecules that trace the cold, warm and UV-irradiated gas are used to probe the temperature structure of multiple and single protostellar systems on 7000 AU scales. Single, close binary, and wide multiples present similar current envelope gas temperatures, as estimated from H_2_CO and DCO^+^ line ratios. The temperature of the outflow cavity, traced by c-C_3_H_2_, on the other hand, shows a relation with bolometric luminosity and an anticorrelation with envelope mass. Although the envelope gas temperatures are similar for all objects surveyed, wide multiples tend to exhibit a more massive reservoir of cold gas compared to close binary and single protostars. Although the sample of protostellar systems is small, the results suggest that gas temperature may not have a strong impact on fragmentation. We propose that mass, and density, may instead be key factors in fragmentation.2018A&A...620A..30Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/620/A30CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/774/22 : CO observations of YSOs in NGC 1333 (Plunkett+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/620/A30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/620/A30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/620/A30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/620/A30https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/620/A30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/620/A30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/620/A30/table1 (protostellar systems)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/620/A30/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/620/A30/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/620/A30/table1?GETtext/xml+votable180.050000true51.402208330.75593060.0055555555555555566/857-860 862 1539https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/620/A30?format=asciidefaultJ/A+A/620/A30/table1protostellar systemsSourceSourcemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTypeSystem typesrc.classcharSystemSystemmeta.id.parentcharn_System[a] Note on System (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSep? Separationarcsecpos.angDistancefloatnullableClass[0I] Classmeta.code.classcharRegionRegion (2)meta.notecharLbolBolometric luminositysolLumphys.luminosityfloate_Lbolrms uncertainty on LbolsolLumstat.errorfloatFileName1Name of the fits file with APEX-1 spectrameta.id;meta.fitscharFileName2Name of the fits file with APEX-2 spectrameta.id;meta.fitscharFileName3Name of the fits file with APEX-3 spectrameta.id;meta.fitscharFileName4Name of the fits file with OTF ^13^CO (5-6) spectrameta.idcharFileName5Name of the fits file with OTF ^13^CO (4-3) spectrameta.idcharJ/A+A/620/A30/listList of fits filesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNspNumber of spectrameta.numberintObs.dateObservation datetime.epoch;obsnullablebFreqLower relative frequency interval valueGHzem.freq;stat.mindoubleBFreqUpper relative frequency interval valueGHzem.freq;stat.maxdoubledFreqFrequency resolutionHzspect.resolutiondoublesizeSize of FITS fileKibytephys.size;meta.fitsintsp1Show the first spectrummeta.ref.urlcharFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar