J/ApJ/815/4ivo://CDS.VizieR/J/ApJ/815/4doi:10.26093/cds/vizier.18150004CDSNinan J.P.Ojha D.K.Baug T.Bhatt B.C.Mohan V.Ghosh S.K.,Men'shchikov A.Anupama G.C.Tamura M.Henning TH.2017-06-12T08:24:34Z2016-03-30T13:54:10ZCDS support team

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

cds-question@unistra.frline-intensitiesinfrared-photometryvisible-astronomybroad-band-photometryvariable-starsWe present a detailed study of V899 Mon (a new member in the FUors/EXors family of young low-mass stars undergoing outburst), based on our long-term monitoring of the source starting from 2009 November to 2015 April. Our optical and near-infrared photometric and spectroscopic monitoring recorded the source transitioning from its first outburst to a short-duration quiescence phase (<1yr), and then returning to a second outburst. We report here the evolution of the outflows from the inner region of the disk as the accretion rate evolved in various epochs. Our high-resolution (R~37000) optical spectrum could resolve interesting clumpy structures in the outflow traced by various lines. Change in far-infrared flux was also detected between two outburst epochs. Based on our observations, we constrained various stellar and envelope parameters of V899 Mon, as well as the kinematics of its accretion and outflow. The photometric and spectroscopic properties of this source fall between classical FUors and EXors. Our investigation of V899 Mon hints at instability associated with magnetospheric accretion being the physical cause of the sudden short-duration pause of the outburst in 2011. It is also a good candidate to explain similar short-duration pauses in outbursts of some other FUors/EXors sources.2015ApJ...815....4Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/815/4CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)J/A+A/561/A2 : 36 accreting YSOs emission lines (Alcala+, 2014)J/ApJ/778/116 : V1647 Ori long-term optical + NIR observations (Ninan+, 2013)J/A+A/556/A60 : BVRI observations of the FUor star V582 Aur (Semkov+, 2013)J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)J/A+A/409/169 : UBVRI light curves of AA Tau in 1999 (Bouvier+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/815/4https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/815/4http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/815/4https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/815/4https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/815/4http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/815/4GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/815/4/table1Observation log of V899 MonrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of the observationtime.epoch;obsnullableJDJulian Date of the observationdtime.epochintFWHM[0.6/5.3]? Full-Width at Half-Maximum (1)arcsecphys.angSizefloatnullableSetupThe Filter(s) and Grism(s) usedinstr.setupcharInstInstrument(s) used (HFOSC, IFOSC, TIRSPEC, NIRCAM or TIRCAM2); see the "Description" section abovemeta.ref;pos.framecharJ/ApJ/815/4/table5Spectral line measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of the observationtime.epoch;obsnullableJDJulian Date of the observationdtime.epochdoubleEWHa[-64.5/-6.8]? H{alpha} {lambda}6562.8 equivalent width (1)0.1nmspect.line.eqWidth;em.line.HalphafloatnullableFHa? H{alpha} {lambda}6562.8 flux (2)mW.m**-2phot.fluxdoublenullableEWaHa[0/7.2]? H{alpha} {lambda}6562.8 absorption equivalent width (1)0.1nmspect.line.eqWidth;em.line.HalphafloatnullableVHa? H{alpha} {lambda}6562.8 outflow velocitykm/sspect.dopplerVelocintnullableEWCaII1? Ca II {lambda}8498 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFCaII1? Ca II {lambda}8498 flux (2)mW.m**-2phot.fluxdoublenullableEWCaII2? Ca II {lambda}8542 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFCaII2? Ca II {lambda}8542 flux (2)mW.m**-2phot.fluxdoublenullableEWaCaII2[0.4/3.8]? Ca II {lambda}8542 absorption equivalent width (1)0.1nmspect.line.eqWidthfloatnullableVCaII2? Ca II {lambda}8542 outflow velocitykm/sspect.dopplerVelocintnullableEWCaII3? Ca II {lambda}8662 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFCaII3? Ca II {lambda}8662 flux (2)mW.m**-2phot.fluxdoublenullableEWaCaII3[0/1.7]? Ca II {lambda}8662 absorption equivalent width (1)0.1nmspect.line.eqWidthfloatnullableVCaII3? Ca II {lambda}8662 outflow velocitykm/sspect.dopplerVelocfloatnullableEWOI1? [O I] {lambda}6300.3 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFOI1? [O I] {lambda}6300.3 flux (2)mW.m**-2phot.fluxdoublenullableEWOI2? [O I] {lambda}6363.8 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFOI2? [O I] {lambda}6363.8 flux (2)mW.m**-2phot.fluxdoublenullableEWOI3? O I {lambda}7773 equivalent width (1)0.1nmspect.line.eqWidth;em.opt.IfloatnullableFOI3? O I {lambda}7773 flux (2)mW.m**-2phot.fluxdoublenullableEWH8? H8 {lambda}3889.0 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFH8? H8 {lambda}3889.0 flux (2)mW.m**-2phot.fluxdoublenullableEWH7? H7 {lambda}3970.1 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFH7? H7 {lambda}3970.1 flux (2)mW.m**-2phot.fluxdoublenullableEWHd[1.6/4.3]? H{delta} {lambda}4101.7 equivalent width (1)0.1nmspect.line.eqWidth;em.line.HdeltafloatnullableFHd? H{delta} {lambda}4101.7 flux (2)mW.m**-2phot.fluxdoublenullableEWHg[2.4/4.3]? H{gamma} {lambda}4340.5 equivalent width (1)0.1nmspect.line.eqWidth;em.line.HgammafloatnullableFHg? H{gamma} {lambda}4340.5 flux (2)mW.m**-2phot.fluxdoublenullableEWHb[1.1/4.4]? H{beta} {lambda}4861.3 equivalent width (1)0.1nmspect.line.eqWidth;em.line.HbetafloatnullableFHb? H{beta} {lambda}4861.3 flux (2)mW.m**-2phot.fluxdoublenullableEWaHb[1/5]? H{beta} {lambda}4861.3 absorption equivalent width (1)0.1nmspect.line.eqWidth;em.line.HbetafloatnullableVHb? H{beta} {lambda}4861.3 outflow velocitykm/sspect.dopplerVelocfloatnullableEWCaIIK[-15.5/2.1]? CaII(K) {lambda}3933.6 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFCaIIK? CaII(K) {lambda}3933.6 flux (2)mW.m**-2phot.fluxdoublenullableEWSII1? [S II] {lambda}4069 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFSII1? [S II] {lambda}4069 flux (2)mW.m**-2phot.fluxdoublenullableEWFeII1? [Fe II] {lambda}4815 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFFeII1? [Fe II] {lambda}4815 flux (2)mW.m**-2phot.fluxdoublenullableEWHeI? He I {lambda}5015.6 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFHeI? He I {lambda}5015.6 flux (2)mW.m**-2phot.fluxdoublenullableEWNaI? Na D {lambda}5895 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFNaI? Na D {lambda}5895 flux (2)mW.m**-2phot.fluxdoublenullableEWFeII2? Fe II {lambda}6432 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFFeII2? Fe II {lambda}6432 flux (2)mW.m**-2phot.fluxdoublenullableEWFeII3? Fe II {lambda}6517 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFFeII3? Fe II {lambda}6517 flux (2)mW.m**-2phot.fluxdoublenullableEWSII2? [S II] {lambda}6730 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFSII2? [S II] {lambda}6730 flux (2)mW.m**-2phot.fluxdoublenullableEWFeII4? [Fe II] {lambda}7155 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFFeII4? [Fe II] {lambda}7155 flux (2)mW.m**-2phot.fluxdoublenullableEWCaII4? [Ca II] {lambda}7291 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFCaII4? [Ca II] {lambda}7291 flux (2)mW.m**-2phot.fluxdoublenullableEWBlend[-2.6/-0.2]? [OI]+[CaII] {lambda}7324 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFWBlend? [OI]+[CaII] {lambda}7324 flux (2)mW.m**-2phot.fluxdoublenullableEWFeII5? [Fe II] {lambda}7380 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFFeII5? [Fe II] {lambda}7380 flux (2)mW.m**-2phot.fluxdoublenullableEWKI? K I {lambda}7699 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFKI? K I {lambda}7699 flux (2)mW.m**-2phot.fluxdoublenullableEWFeI? Fe I {lambda}8388 equivalent width (1)0.1nmspect.line.eqWidth;em.opt.IfloatnullableFFeI? Fe I {lambda}8388 flux (2)mW.m**-2phot.fluxdoublenullableEWOI4? O I {lambda}8446 equivalent width (1)0.1nmspect.line.eqWidth;em.opt.IfloatnullableFOI4? O I {lambda}8446 flux (2)mW.m**-2phot.fluxdoublenullableEWFeII6? [Fe II] {lambda}8616 equivalent width (1)0.1nmspect.line.eqWidthfloatnullableFFeII6? [Fe II] {lambda}8616 flux (2)mW.m**-2phot.fluxdoublenullableJ/ApJ/815/4/table2Magnitudes of V899 MonrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Date of the observationdtime.epochintUmag[16.5/16.6]? The U band magnitude (1)magphot.mag;em.opt.UfloatnullableBmag[15.75]? The B band magnitude (1)magphot.mag;em.opt.BfloatnullableVmag[13.1/16.9]? The V band magnitude (1)magphot.mag;em.opt.VfloatnullableRmag[12.1/15.8]? The R band magnitude (1)magphot.mag;em.opt.RfloatnullableImag[11.1/14.8]? The I band magnitude (1)magphot.mag;em.opt.IfloatnullableJmag[9/10]? The J band magnitude (1)magphot.mag;em.IR.JfloatnullableHmag[7.9/8.9]? The H band magnitude (1)magphot.mag;em.IR.HfloatnullableKmag[7.1/8.2]? The K_S_ band magnitude (1)magphot.mag;em.IR.Kfloatnullable