J/A+A/682/A17ivo://CDS.VizieR/J/A+A/682/A17doi:10.26093/cds/vizier.36820017CDSSzymczak M.Durjasz M.Goedhart S.Wolak P.Bartkiewicz A.,Caratti o Garatti A.Kobak A.Massi F.2024-11-06T20:07:00Z2024-01-29T09:30:52ZCDS support team

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

cds-question@unistra.frinfrared-sourcesastrophysical-masersradio-astronomyWe report the discovery and analysis of a periodic methanol maser in the massive protostar IRAS 20216+4104. To obtain the light curve, we used the 6.7GHz methanol maser spectra collected between 2000-2003 and 2009-2023 with the Hartebeesthoek and Torun radio telescopes, as well as spectra from the literature reported prior to 1992. The velocity-integrated flux density shows sinusoidal-like variations with a period of 6.9+/-0.03yr. All but one of the features show periodic changes with a relative amplitude of 2 up to >89. A slightly variable feature displays a moderate anti-correlation between the flux density and the other significantly variable features. The maser emission appears to follow the continuum emission of the red-shifted outflow cavity. A maximum emission of 3.4 and 4.6um precedes the maser peak by 15% of the period and the (infrared) IR light centroids show time-dependent displacement. The periodic behaviour of the maser and IR emission is likely due to the eclipsing effect from a wobbling inner disk.2024A&A...682A..17Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/682/A17CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/682/A17https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/682/A17http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/682/A17https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/682/A17https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/682/A17http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/682/A17GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredRadiodefaultJ/A+A/682/A17/fig1Time series of the velocity integrated 6.7GHz maser flux density in IRAS 20216+4104recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Daydtime.epochdoubleSiIntegrated flux density at 6.7GHzJy.km/sphot.flux.density;em.radio.6-12GHzdoublee_SiIntegrated flux density at 6.7GHz errorJy.km/sstat.errordoubleJ/A+A/682/A17/fig4Light curves of the main maser features in IRAS 20216+4104 taken with the Torun telescoperecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Daydtime.epochdoubleSFlux densityJyphot.flux.density;em.radiodoublee_SFlux density errorJystat.errordoubleVLSRLSR velocitykm/sphys.veloc;pos.lsrdoubleJ/A+A/682/A17/figa1Dynamic spectrum of the 6.7GHz methanol maser emission of IRAS 20216+4104recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsNr[1/667] Epoch numbermeta.idintMJDModified Julian Daydtime.epochdoubleindexedDateDecimal yearyrtime.epochdoubleChannelSpectral channelmeta.id;instrdoubleVLSRLSR velocitykm/sphys.veloc;pos.lsrdoubleSII flux densityJyphot.flux.density;em.radiodoublee_SII flux density errorJystat.errordoubleSVV flux density flux densityJyphot.flux.density;em.radiodoublee_SVV flux density errorJystat.errordoubleSLHCLHC flux densityJyphot.flux.density;em.radiodoublee_SLHCLHC flux density errorJystat.errordoubleSRHCRHC flux densityJyphot.flux.density;em.radiodoublee_SRHCRHC flux density errorJystat.errordouble