J/ApJ/923/171ivo://CDS.VizieR/J/ApJ/923/171doi:10.26093/cds/vizier.19230171CDSPark S.Kospal A.Cruz-Saenz de Miera F.Siwak M.Drozdz M.,Ignacz B.Jaffe D.T.Konyves-Toth R.Kriskovics L.Lee J.-J.,Lee J.-E.Mace G.N.Ogloza W.Pal A.Potter S.B.Szabo Z.M.,Sefako R.Worters H.L.2023-11-03T12:30:55Z2023-07-24T10:46:36ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinfrared-photometryvisible-astronomyWide-band photometryinfrared-astronomyspectroscopyThe eruptive young star V899 Mon shows characteristics of both FUors and EXors. It reached a peak brightness in 2010, then briefly faded in 2011, followed by a second outburst. We conducted multifilter optical photometric monitoring, as well as optical and near-infrared spectroscopic observations, of V899 Mon. The light curves and color-magnitude diagrams show that V899 Mon has been gradually fading after its second outburst peak in 2018, but smaller accretion bursts are still happening. Our spectroscopic observations taken with Gemini/IGRINS and VLT/MUSE show a number of emission lines, unlike during the outbursting stage. We used the emission line fluxes to estimate the accretion rate and found that it has significantly decreased compared to the outbursting stage. The mass-loss rate is also weakening. Our 2D spectroastrometric analysis of emission lines recovered jet and disk emission of V899 Mon. We found that the emission from permitted metallic lines and the CO bandheads can be modeled well with a disk in Keplerian rotation, which also gives a tight constraint for the dynamical stellar mass of 2M_{sun}_. After a discussion of the physical changes that led to the changes in the observed properties of V899 Mon, we suggest that this object is finishing its second outburst.2021ApJ...923..171Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/923/171CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/339 : Swift/UVOT Serendipitous Source Catalog (Yershov, 2015)J/A+A/507/881 : Emission lines in EX Lup optical spectrum (Sipos+, 2009)J/AJ/140/1214 : Near-IR spectroscopic survey of class I YSOs (Connelley+, 2010)J/A+A/511/A24 : MHO Catalogue (Davis+, 2010)J/ApJ/778/116 : V1647 Ori long-term optical & NIR observations (Ninan+, 2013)J/ApJ/792/30 : NEOWISE magnitudes for near-Earth objects (Mainzer+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/ApJ/815/4 : V899 Mon long-term monitoring (Ninan+, 2015)J/ApJ/831/133 : Follow-up of probable young star ASASSN-15qi (Herczeg+, 2016)J/A+A/600/A20 : Lupus YSOs X-shooter spectroscopy (Alcala+, 2017)J/ApJS/238/29 : IGRINS spectral library (Park+, 2018)J/ApJ/889/148 : V346 Nor IJHKs photometry & IR spectra (Kospal+, 2020)J/A+A/641/A33 : EX Lup SPHERE and SINFONI images (Rigliaco+, 2020)J/ApJS/256/30 : ALMA 1.33mm images of 10 FU Orionis-type stars (Kospal+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/923/171https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/923/171http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/923/171https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/923/171https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/923/171http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/923/171GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.040811542443644e-19 4.920466254354166e-19OpticalInfrareddefaultJ/ApJ/923/171/table5Photometry of V899 MonrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleUmag[17.34/18.7]? U-band magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag[0.02/0.8]? Uncertainty on the Umagmagstat.error;phot.magfloatnullableBmag[14/16.63]? Johnson B magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag[0.004/0.16]? Uncertainty on the Bmagmagstat.error;phot.magfloatnullableg'mag[15.46/15.85]? g'-band magnitudemagphot.mag;em.opt.Bfloatnullablee_g'mag[0.004/0.05]? Uncertainty on the g'magmagstat.error;phot.magfloatnullableVmag[12.73/15.13]? Johnson V magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag[0.002/0.06]? Uncertainty on the Vmagmagstat.error;phot.magfloatnullabler'mag[14.16/14.46]? r'-band magnitudemagphot.mag;em.opt.Rfloatnullablee_r'mag[0.003/0.05]? Uncertainty on the r'magmagstat.error;phot.magfloatnullableRcmag[11.88/14.2]? Cousins R magnitudemagphot.mag;em.opt.Rfloatnullablee_Rcmag[0.006/0.03]? Uncertainty on the Rcmagmagstat.error;phot.magfloatnullablei'mag[13.46/13.74]? i'-band magnitudemagphot.mag;em.opt.Ifloatnullablee_i'mag[0.002/0.05]? Uncertainty on the i'magmagstat.error;phot.magfloatnullableIcmag[10.94/13.21]? Cousins I magnitudemagphot.mag;em.opt.Ifloatnullablee_Icmag[0.004/0.05]? Uncertainty on the Icmagmagstat.error;phot.magfloatnullablez'mag[13/13.3]? z'-band magnitudemagphot.mag;em.opt.Ifloatnullablee_z'mag[0.014/0.02]? Uncertainty on the z'magmagstat.error;phot.magfloatnullableTelTelescopemeta.id;instr.telcharJ/ApJ/923/171/spOptical and NIR spectra of V899 Mon with rich emission linesFileName of the file in subdirectory "sp"meta.id;meta.filecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescope/Instrumentmeta.notecharBandSpectrum bandinstr.bandpasscharDateObservation datetime.epoch;obsnullableSpInteractive spectrum plotmeta.ref.urlchar