J/ApJ/733/L8ivo://CDS.VizieR/J/ApJ/733/L8doi:10.26093/cds/vizier.17339008CDSKun M.Szegedi-Elek E.Moor A.Abraham P.Acosta-Pulido J.A.Apai D.,Kelemen J.Pal A.Racz M.Regaly ZS.Szakats R.Szalai N.Szing A.2017-06-22T14:28:23Z2012-12-19T08:21:21ZCDS support team

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

cds-question@unistra.frvariable-starsinfrared-photometryvisible-astronomyphotometryWe conducted a long-term optical photometric and spectroscopic monitoring of the strongly variable, accreting young sun-like star [KOS94] HA11, associated with the dark cloud Lynds 1340 that exhibited large amplitude (5-6mag in the I_C_ band) brightness variations on 2-3 years timescales, flat spectral energy distribution (SED), and extremely strong (300<~EW/{AA}<~900) H{alpha} emission. In this Letter we describe the basic properties of the star, derived from our observations between 1999 and 2011, and put into context the observed phenomena. The observed variations in the emission spectra, near-infrared colors, and SED suggest that [KOS94] HA11 (spectral type: K7-M0) is an eruptive young star, possibly similar in nature to V1647 Ori: its large-scale photometric variations are governed by variable accretion rate, associated with variations in the inner disk structure. The star recently has undergone strong and rapid brightness variations, thus its further observations may offer a rare opportunity for studying structural and chemical rearrangements of the inner disk, induced by variable central luminosity.2011ApJ...733L...8Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/733/L8CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/733/L8https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/733/L8http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/733/L8https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/733/L8https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/733/L8http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/733/L8GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/733/L8/table1Optical, near- and mid-IR photometric observations of [KOS94] HA 11 between 1999 and 2011 MarchrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate of the observationtime.epochnullableJDModified Julian date; JD-2450000dtime.epochfloatBandName or central wavelength in microns of photometric band (J H Ks, V Rc Ic or 3.6 4.5 5.8 8.0 and 24.0)meta.code;instr.filtercharmagMeasured magnitude in Bandmagphot.magfloate_magError of the magmagstat.error;phot.magfloatInstTelescope/instrument or data base for magmeta.notechar