J/ApJ/853/77ivo://CDS.VizieR/J/ApJ/853/77doi:10.26093/cds/vizier.18530077CDSSimon J.D.Shappee B.J.Pojmanski G.Montet B.T.Kochanek C.S.,van Saders J.Holoien T.W.-S.Henden A.A.2019-01-07T14:26:20Z2018-11-12T08:00:22ZCDS support team

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

cds-question@unistra.frf-starsphotometryvisible-astronomyvariable-starsWe present ~800 days of photometric monitoring of Boyajian's Star (KIC8462852) from the All-Sky Automated Survey for Supernovae (ASAS-SN) and ~4000d of monitoring from the All Sky Automated Survey (ASAS). We show that from 2015 to the present the brightness of Boyajian's Star has steadily decreased at a rate of 6.3+/-1.4mmag/yr, such that the star is now 1.5% fainter than it was in 2015 February. Moreover, the longer time baseline afforded by ASAS suggests that Boyajian's Star has also undergone two brightening episodes in the past 11 years, rather than only exhibiting a monotonic decline. We analyze a sample of ~1000 comparison stars of similar brightness located in the same ASAS-SN field and demonstrate that the recent fading is significant at >=99.4% confidence. The 2015-2017 dimming rate is consistent with that measured with Kepler data for the time period from 2009 to 2013. This long-term variability is difficult to explain with any of the physical models for the star's behavior proposed to date.2018ApJ...853...77Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/853/77CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)I/259 : The Tycho-2 Catalogue (Hog+ 2000)II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-2005)I/337 : Gaia DR1 (Gaia Collaboration, 2016)J/AJ/135/850 : Properties of eclipsing binaries found in TrES (Devor+, 2008)J/ApJ/696/870 : Catalina Real-time Transient Survey (CRTS) (Drake+, 2009)J/AcA/59/33 : ASAS. Variable stars catalog in Kepler field. (Pigulski+, 2009)J/ApJ/733/50 : MIR photometric monitoring of the ONC (Morales-Calderon+, 2011)J/AJ/144/24 : The Kepler-INT survey (Greiss+, 2012)J/ApJ/776/67 : Rotational tracks (van Saders+, 2013)J/AJ/147/82 : Monitoring of disk-bearing stars in NGC 2264 (Cody+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/MNRAS/463/4210 : All-sky catalog of solar-type dwarfs (Nascimbeni+, 2016)J/ApJS/224/19 : The KepVIM catalog (Makarov+, 2016)J/ApJ/847/131 : KIC 8462852 one-yr obs. from UV to MIR (Meng+, 2017)J/A+A/610/L12 : KIC 8462852 GTC spectra (Deeg+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/853/77https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/853/77http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/853/77https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/853/77https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/853/77http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/853/77GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.322582951404819e-19 3.852589004194616e-19OpticaldefaultJ/ApJ/853/77/table1ASAS-SN photometry of Boyajian's StarrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleVmag[11.8/12] Apparent V band magnitudemagphot.mag;em.opt.Vfloate_Vmag[0.008/0.02] Uncertainty in Vmagmagstat.error;phot.mag;em.opt.VfloatFWHM[1.4/2.3] Full-Width at Half-Maximum of stellar PSFpixspect.line.widthfloatZP[-3/-2.1] Zero point (1)magphot.magfloatJ/ApJ/853/77/table3ASAS photometry of Boyajian's StarrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleVmag[11.8/12.1] Apparent V band magnitudemagphot.mag;em.opt.Vfloate_Vmag[0.01/0.06] Uncertainty in Vmagmagstat.error;phot.mag;em.opt.Vfloat