J/ApJ/854/109ivo://CDS.VizieR/J/ApJ/854/109doi:10.26093/cds/vizier.18540109CDSZhou G.Rappaport S.Nelson L.Huang C.X.Senhadji A.Rodriguez J.E.,Vanderburg A.Quinn S.Johnson C.I.Latham D.W.Torres G.Gary B.L.,Tan T.G.Johnson M.C.Burt J.Kristiansen M.H.Jacobs T.L.LaCourse D.,Schwengeler H.M.Terentev I.Bieryla A.Esquerdo G.A.Berlind P.,Calkins M.L.Bento J.Cochran W.D.Karjalainen M.Hatzes A.P.,Karjalainen R.Holden B.Butler R.P.2019-01-09T08:35:25Z2018-12-21T14:35:10ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsphotometryvisible-astronomyradial-velocityDisks in binary systems can cause exotic eclipsing events. MWC 882 (BD-224376, EPIC 225300403) is such a disk-eclipsing system identified from observations during Campaign 11 of the K2 mission. We propose that MWC 882 is a post-Algol system with a B7 donor star of mass 0.542+/-0.053M_{sun}_ in a 72-day orbit around an A0 accreting star of mass 3.24+/-0.29M_{sun}_. The 59.9+/-6.2R_{sun}_ disk around the accreting star occults the donor star once every orbit, inducing 19-day long, 7% deep eclipses identified by K2 and subsequently found in pre-discovery All-Sky Automated Survey and All Sky Automated Survey for Supernovae observations. We coordinated a campaign of photometric and spectroscopic observations for MWC 882 to measure the dynamical masses of the components and to monitor the system during eclipse. We found the photometric eclipse to be gray to ~1%. We found that the primary star exhibits spectroscopic signatures of active accretion, and we observed gas absorption features from the disk during eclipse. We suggest that MWC 882 initially consisted of a ~3.6M_{sun}_ donor star transferring mass via Roche lobe overflow to a ~2.1M_{sun}_ accretor in a ~7-day initial orbit. Through angular momentum conservation, the donor star is pushed outward during mass transfer to its current orbit of 72 days. The observed state of the system corresponds with the donor star having left the red giant branch ~0.3Myr ago, terminating active mass transfer. The present disk is expected to be short-lived (10^2^yr) without an active feeding mechanism, presenting a challenge to this model.2018ApJ...854..109Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/854/109CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/pollux : POLLUX database of synthetic stellar spectra (Palacios+ 2010-2015)III/260 : General Catalogue of Ap and Am stars (Renson+ 2009)II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)J/A+A/463/671 : Rotational velocities of A-type stars. III. (Royer+, 2007)J/ApJ/720/1118 : i-band photometry of HAT-P-16 (Buchhave+, 2010)J/A+A/530/A146 : Spectral and UBV analysis of {epsilon} Aur (Chadima+ 2011)J/A+A/537/A146 : Stellar models with rotation (0.8<M<120) (Ekstrom+, 2012)J/ApJ/788/41 : BVRI light curve of OGLE LMC-ECL-11893 (Dong+, 2014)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/854/109https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/854/109http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/854/109https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/854/109https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/854/109http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/854/109GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/854/109/table3Differential photometry for MWC 882InstInstrument (1)meta.id;instrcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2451940.8/2458038.6] Barycentric Julian Date of observationdtime.epochdoubleFlux[0/1.2]? Differential Flux, magnitudesmagphot.mag;arith.difffloatnullablee_Flux[0.0005/0.2]? Uncertainty in Fluxmagstat.error;phot.fluxfloatnullableFiltFilter (Kp, V, g', z', B or I)meta.notecharJ/ApJ/854/109/table5Relative radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2457960.7/2458021.7] Barycentric Julian Date (TBD) of observationdtime.epochdoubleBlBlended RV flag (1)meta.codecharRV1[-34.1/0]? Velocity of the accretor (2)km/sspect.dopplerVelocfloatnullablee_RV1[0/0.4]? Uncertainty in RV1km/sstat.errorfloatnullableRV2[-108/54] Velocity of the donor (3)km/sspect.dopplerVelocfloate_RV2[0.5/2] Uncertainty in RV2 (4)km/sstat.errorfloatInstInstrument (5)meta.id;instrchar