J/A+A/686/A160ivo://CDS.VizieR/J/A+A/686/A160doi:10.26093/cds/vizier.36860160CDSFiorellino E.Abraham P.Kospal A.Kun M.Alcala J.M.,Caratti o Garatti A.Cruz-Saenz de Miera F.Garcia-Alvarez D.,Giannini T.Park S.Siwak M.Szilagyi M.Covino E.Marton G.Nagy Z.,Nisini B.Szabo Z.M.Bora Z.Cseh B.Kalup C.Krezinger M.,Kriskovics L.Ogloza W.Pal A.Sodor A.Sonbas E.Szakats R.Vida K.,Vinko J.Wyrzykowski L.Zielinski P.2024-11-07T20:03:44Z2024-06-06T07:44:28ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsyoung-stellar-objectsinfrared-astronomyspectroscopyGaia18cjb is one of the Gaia-alerted eruptive young star candidates which has been experiencing a slow and strong brightening during the last 13 years, similar to some FU Orionis-type objects. The aim of this work is to derive the young stellar nature of Gaia18cjb, determine its physical and accretion properties to classify its variability. We conducted monitoring observations using multi-filter optical and near-infrared photometry, as well as near-infrared spectroscopy. We present the analysis of pre-outburst and outburst optical and infrared light curves, color-magnitude diagrams in different bands, the detection of near-IR spectral lines, and estimates of both stellar and accretion parameters during the burst. The optical light curve shows an unusually long (8 years) brightening event of 5mag in the last 13 years, before reaching a plateau indicating that the burst is still on-going, suggesting a FUor-like nature. The same outburst is less strong in the infrared light curves. The near-infrared spectra, obtained during the outburst, exhibit emission lines typical of highly accreting low-intermediate mass young stars with typical EXor features. The spectral index of Gaia18cjb SED classifies it as a Class I in the pre-burst stage and a Flat Spectrum young stellar object (YSO) during the burst. Gaia18cjb is an eruptive YSO which shows FUor-like photometric features (in terms of brightening amplitude and length of the burst) and EXor-like spectroscopic features and accretion rate, as V350 Cep and V1647 Ori, classified as objects in between FUors and EXors.2024A&A...686A.160Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/686/A160CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/686/A160https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/686/A160http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/686/A160https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/686/A160https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/686/A160http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/686/A160GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/686/A160/list (List of GTC and NTT-SOFI fits spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/686/A160/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/686/A160/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/686/A160/list?GETtext/xml+votable180.050000true99.78240.147380.0055555555555555566/22167https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/686/A160?format=asciiInfrareddefaultJ/A+A/686/A160/hksummedHK reduced spectrum from LBT, SNR summed between LBT a and blambdaWavelengthnmem.wldoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFluxFlux not normalizedctphot.flux;arith.ratiodoubleJ/A+A/686/A160/zjsummedzJ reduced spectrum from LBT, SNR summed between LBT a and brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelengthnmem.wldoubleFluxFlux not normalizedctphot.flux;arith.ratiodoubleJ/A+A/686/A160/spectReduced, not flux calibrated LT spectrumrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxFlux10mW.m**-2.nm**-1phot.fluxdoubleJ/A+A/686/A160/listList of GTC and NTT-SOFI fits spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainScale? Scale of the imagearcsec/pixinstr.scalefloatnullableNxNumber of pixels along X-axismeta.numberintNy? Number of pixels along Y-axismeta.numberintnullableObs.dateObservation datestime.epoch;obsnullablebLAMBDA? Lower value of wavelength interval0.1nmem.wldoublenullableBLAMBDA? Upper value of wavelength interval0.1nmem.wlfloatnullabledLAMBDA? Wavelenght resolution0.1nmpos.angResolutiondoublenullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitscharspShow the spectrummeta.ref.urlchar