J/ApJ/899/130ivo://CDS.VizieR/J/ApJ/899/130doi:10.26093/cds/vizier.18990130CDSSzegedi-Elek E.Abraham P.Wyrzykowski L.Kun M.Kospal A.Chen L.,Marton G.Moor A.Kiss C.Pal A.Szabados L.Varga J.,Varga-Verebelyi E.Andreas C.Bachelet E.Bischoff R.Bodi A.,Breedt E.Burgaz U.Butterley T.Carrasco J.M.Cepas V.,Damljanovic G.Gezer I.Godunova V.Gromadzki M.Gurgul A.Hardy L.,Hildebrandt F.Hoffmann S.Hundertmark M.Ihanec N.Janulis R.,Kalup C.Kaczmarek Z.Konyves-Toth R.Krezinger M.Kruszynska K.,Littlefair S.Maskoliunas M.Meszaros L.Mikolajczyk P.Mugrauer M.,Netzel H.Ordasi A.Pakstiene E.Rybicki K.A.Sarneczky K.Seli B.,Simon A.Siskauskaite K.Sodor A.Sokolovsky K.V.Stenglein W.,Street R.Szakats R.Tomasella L.Tsapras Y.Vida K.Zdanavicius J.,Zielinski M.Zielinski P.Ziolkowska O.2025-03-03T20:11:05Z2025-01-24T17:08:56ZCDS support team

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

cds-question@unistra.frvariable-starsinfrared-photometryvisible-astronomyphotometryWe present optical-infrared photometric and spectroscopic observations of Gaia 18dvy, located in the Cygnus OB3 association at a distance of 1.88kpc. Gaia 18dvy was noted by the Gaia alerts system when its light curve exhibited a ~4mag rise in 2018-2019. The brightening was also observable at mid-infared wavelengths. The infrared colors of Gaia 18dvy became bluer as the outburst progressed. Its optical and near-infrared spectroscopic characteristics in the outburst phase are consistent with those of bona fide FU Orionis-type young eruptive stars. The progenitor of the outburst is probably a low-mass K-type star with an optical extinction of ~3mag. A radiative transfer modeling of the circumstellar structure, based on the quiescent spectral energy distribution, indicates a disk with a mass of 4x10^-3^M_{sun}_. Our simple accretion disk modeling implies that the accretion rate had been exponentially increasing for more than 3yr until mid-2019, when it reached a peak value of 6.9x10^-6^M_{sun}_/yr. In many respects, Gaia 18dvy is similar to the FU Ori-type object HBC722.2020ApJ...899..130Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/899/130CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012)I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJ/454/151 : OB Associations of the Northern Milky Way (Massey+ 1995)J/ApJ/733/L8 : Optical and IR photometry of [KOS94] HA11 (Kun+, 2011)J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia18dvy/ : Gaia alerts for Gaia18dvyhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/899/130https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/899/130http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/899/130https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/899/130https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/899/130http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/899/130GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/899/130/table1Follow-up photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJD[8541/8830] Modified Julian Date (JD-2400000.5)dtime.epochdoubleBandPhotometry band (B, V, R_C, I_C, i and r)instr.bandpasscharmag[5.7/18] Magnitude measured in the bandmagphot.magfloate_mag[0/0.5] Uncertainty for magnitudemagstat.error;phot.magfloatInstTelescope used for measuring the magnitudemeta.id;instrchar