J/A+A/602/A99ivo://CDS.VizieR/J/A+A/602/A99doi:10.26093/cds/vizier.36020099CDSJurdana-Sepic R.Munari U.Antoniucci S.Giannini T.Li Causi G.,Lorenzetti D.2017-07-17T11:42:16Z2017-06-21T08:27:30ZCDS support team

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

cds-question@unistra.frvariable-starspre-main-sequence-starsinfrared-photometryvisible-astronomybroad-band-photometryEXor objects are young variables that show episodic variations of brightness commonly associated to enhanced accretion outbursts. With the aim of investigating the long-term photometric behaviour of a few EXor sources, we present here data from the archival plates of the Asiago Observatory, showing the Orion field where the three EXors V1118, V1143, and NY are located. A total of 484 plates were investigated, providing a total of more than 1000 magnitudes for the three stars, which cover a period of about 35yrs between 1959 to 1993. We then compared our data with literature data. Apart from a newly discovered flare-up of V1118, we identify the same outbursts already known, but we provide two added values: (i) a long-term sampling of the quiescence phase; and (ii) repeated multi-colour observations (BVRI bands). The former allows us to give a reliable characterisation of the quiescence, which represents a unique reference for studies that will analyze future outbursts and the physical changes induced by these events. The latter is useful for confirming whether the intermittent increases of brightness are accretion-driven (as in the case of V1118), or extinction-driven (as in the case of V1143). Accordingly, doubts arise about the V1143 classification as a pure EXor object. Finally, although our plates do not separate NY Ori and the star very close to it, they indicate that this EXor did not undergo any major outbursts during our 40yrs of monitoring.2017A&A...602A..99Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/602/A99CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/511/A63 : V1118 Ori UBVRIJHK outburst light curves (Audard+, 2010)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/602/A99https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/602/A99http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/602/A99https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/602/A99https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/602/A99http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/602/A99GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/602/A99/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/602/A99/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/602/A99/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/602/A99/stars?GETtext/xml+votable180.050000true83.6864167-5.56172220.0055555555555555566/21438-21439 22848https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/602/A99?format=asciiInfraredOpticaldefaultJ/A+A/602/A99/starsList of studied starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharRAJ2000Simbad Right ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Simbad Declination (J2000.0)pos.eq.dec;meta.mainBmagSimbad B band magnitudemagphot.mag;em.opt.BfloatVmagSimbad V band magnitudemagphot.mag;em.opt.VfloatSpTypeSimbad MK spectral typesrc.spTypecharLCShow the light curvesmeta.ref.urlcharJ/A+A/602/A99/table1BVRI Asiago plate photometry of NY Ori, V1143 Ori, and V1118 OrirecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleObsDate of observation (yyyy-mm-dd)stime.epochnullableEmulsEmulsioninstr.plate.emulsioncharFiltFiltermeta.id;instr.filtercharTelTelescope (1)meta.id;instr.telcharPlatePlate numbermeta.id;instr.plateintBand1[BVRI] NY Ori observed bandinstr.bandpasscharmag1? NY Ori magnitude in Band Band1magphot.magfloatnullablee_mag1? NY Ori rms uncertainty on mag1magstat.errorfloatnullableBand2[BVRI] V1143 Ori observed bandinstr.bandpasscharl_mag2[<] V1143 Ori magnitude lower limit flagmeta.code.errorcharmag2? V1143 Ori magnitude in Band Band2magphot.magfloatnullablee_mag2? V1143 Ori rms uncertainty on mag2magstat.errorfloatnullableBand3[BVRI] V1118 Ori observed bandinstr.bandpasscharn_mag3[*] V1118 Ori limit flag (2)meta.notecharl_mag3[<] V1118 Ori magnitude lower limit flagmeta.code.errorcharmag3? V1118 Ori magnitude in Band Band3magphot.magfloatnullablee_mag3? V1118 Ori rms uncertainty on mag3magstat.errorfloatnullable