J/A+A/607/A39ivo://CDS.VizieR/J/A+A/607/A39doi:10.26093/cds/vizier.36070039CDSFeher O.Kospal A.Abraham P.Hogerheijde M. R.Brinch C.2018-01-29T13:07:38Z2018-01-11T12:13:11ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsradio-spectroscopyFU Orionis-type objects are pre-main sequence, low-mass stars with large outbursts in visible light that last for several years or decades. They are thought to represent an evolutionary phase during the life of every young star when accretion from the circumstellar disk is enhanced during recurring time periods. These outbursts are able to rapidly build up the star while affecting the physical conditions inside the circumstellar disk and thus the ongoing or future planet formation. In many models, infall from a circumstellar envelope seems to be necessary to trigger the outbursts. We characterise the morphology and the physical parameters of the circumstellar material around FU Orionis-type stars using the emission of millimetre-wavelength molecular tracers. The high-spatial-resolution study provides insight into the evolutionary state of the objects, the distribution of parameters in the envelopes and the physical processes forming the environment of these stars. We observed the J=1-0 rotational transition of ^13^CO and C^18^O towards eight northern FU Orionis-type stars (V1057 Cyg, V1515 Cyg, V2492 Cyg, V2493 Cyg, V1735 Cyg, V733 Cep, RNO 1B and RNO 1C) and determine the spatial and velocity structure of the circumstellar gas on a scale of a few thousand AU. We derive temperatures and envelope masses and discuss the kinematics of the circumstellar material.2017A&A...607A..39Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/607/A39CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/542/A43 : V2493 Cyg BVRI long term photometry (Semkov+, 2012)J/MNRAS/434/38 : 25-years photometry of V1057 Cygni (Kopatskaya+, 2013)J/AJ/147/140 : 24 class I and class II FU Orionis stars SED (Gramajo+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/607/A39https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/607/A39http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/607/A39https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/607/A39https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/607/A39http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/607/A39GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/607/A39/list (List of fits datacubes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/607/A39/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/607/A39/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/607/A39/list?GETtext/xml+votable180.050000true314.7237944.257830.0055555555555555566/3061 14053 14685 14697 15363 15683https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/607/A39?format=asciiRadiodefaultJ/A+A/607/A39/listList of fits datacubesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharLineLine, ^13^CO(1-0) or C^18^O(1-0))instr.bandpassRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintNzNumber of slicesmeta.numberintbVRADLower value of radial velocity intervalm/sphys.veloc;pos.heliocentricdoubleBVRADUpper value of radial velocity intervalm/sphys.veloc;pos.heliocentricdoubledVRADRadial velocity resolutionm/sspect.resolutionfloatsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitsSimbadSimbad column added by the CDSmeta.ref.urlchar