J/AJ/147/140ivo://CDS.VizieR/J/AJ/147/140doi:10.26093/cds/vizier.51470140CDSGramajo L.V.Rodon J.A.Gomez M.2017-10-18T08:23:56Z2014-10-03T09:18:03ZCDS support team

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

cds-question@unistra.frvariable-starspre-main-sequence-starsspectral-energy-distributionFU Orionis stars (FUors) are eruptive pre-main sequence objects thought to represent quasi-periodic or recurring stages of enhanced accretion during the low-mass star-forming process. We characterize the sample of known and candidate FUors in a homogeneous and consistent way, deriving stellar and circumstellar parameters for each object. We emphasize the analysis in those parameters that are supposed to vary during the FUor stage. We modeled the spectral energy distributions of 24 of the 26 currently known FUors, using the radiative transfer code of Whitney et al. We compare our models with those obtained by Robitaille et al. for Taurus class II and I sources in quiescence periods by calculating the cumulative distribution of the different parameters. FUors have more massive disks: we find that ~80% of the disks in FUors are more massive than any Taurus class II and I sources in the sample. Median values for the disk mass accretion rates are ~10^-7^M_{sun}_/yr versus ~10^-5^M_{sun}_/yr for standard young stellar objects (YSOs) and FUors, respectively. While the distributions of envelope mass accretion rates for class I FUors and standard class I objects are similar, FUors, on average, have higher envelope mass accretion rates than standard class II and class I sources. Most FUors (~70%) have envelope mass accretion rates above 10^-7^M_{sun}_/yr. In contrast, 60% of the classical YSO sample has an accretion rate below this value. Our results support the current scenario in which changes experimented by the circumstellar disk explain the observed properties of these stars. However, the increase in the disk mass accretion rate is smaller than theoretically predicted, although in good agreement with previous determinations.2014AJ....147..140Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/147/140CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/147/140https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/147/140http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/147/140https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/147/140https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/147/140http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/147/140GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/147/140/stars (The sample of FU Orionis stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/147/140/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/147/140/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/147/140/stars?GETtext/xml+votable180.050000true100.2471259.59777780.0055555555555555566/1606 3061 14053 14685 14697 15363 15411 21428 21430 21643 21677 22801 22873 23549 23637 23704 30366 36957 39753 42233https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/147/140?format=asciiOpticaldefaultJ/AJ/147/140/table2Fluxes used to construct the SED of each sourcerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the FU Orionis starmeta.id;meta.maincharn_NamePre or post-outburst observation for V1647 Orimeta.notecharlambda[0.1/3410] Wavelength {lambda}umem.wlfloatFluxFlux density (1)Jyphot.fluxdoubler_Flux[1/93] Reference for Flux; in refs.dat filemeta.refintJ/AJ/147/140/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/93] Reference identifierpos.frameintBibCodeBibliographic codemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharCatVizieR catalogmeta.id;meta.tablecharJ/AJ/147/140/starsThe sample of FU Orionis starsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of the FU Orionis starmeta.id;meta.maincharprimarySEDSED plot of this sourcemeta.ref.urlchariSEDInteractive SED plotmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main