J/ApJ/761/34ivo://CDS.VizieR/J/ApJ/761/34doi:10.26093/cds/vizier.17610034CDSLiimets T.Corradi R.L.M.Santander-Garcia M.Villaver E.,Rodriguez-Gil P.Verro K.Kolka I.2014-09-14T09:03:07Z2014-09-04T09:27:08ZCDS support team

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

cds-question@unistra.frnovaeproper-motionsradial-velocityinterstellar-mediumWe present a kinematical study of the optical ejecta of GK Per. It is based on proper-motion measurements of 282 knots from ~20 images spanning 25 years. Doppler shifts are also computed for 217 knots. The combination of proper motions and radial velocities allows a unique three-dimensional view of the ejecta to be obtained. The main results are as follows: (1) the outflow is a thick shell in which knots expand with a significant range of velocities, mostly between 600 and 1000 km/s, (2) kinematical ages indicate that knots have suffered only a modest deceleration since their ejection a century ago, (3) no evidence for anisotropy in the expansion rate is found, (4) velocity vectors are generally aligned along the radial direction, but a symmetric pattern of non-radial velocities is also observed at specific directions, and (5) the total H{alpha}+[N II] flux has been linearly decreasing at a rate of 2.6% per year in the past decade. The eastern nebular side is fading at a slower rate than the western side. Some of the knots were displayed a rapid change of brightness during the 2004-2011 period. Over a longer timescale, a progressive circularization and homogenization of the nebula are taking place; (6) a kinematic distance of 400+/-30 pc is determined. These results raise some problems with the previous interpretations of the evolution of GK Per. In particular, the idea of a strong interaction of the outflow with the surrounding medium in the southwest quadrant is not supported by our data.2012ApJ...761...34Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/761/34CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/cb : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2014)B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)V/123 : Catalog of Cataclysmic Variables (Downes+ 2001-2006)J/A+A/560/A49 : UV spectra of old novae (Selvelli+, 2013)J/MNRAS/431/2 : H{alpha} fluxes of Galactic planetary nebulae (Frew+, 2013)J/PASJ/64/63 : Dwarf novae characterization using SDSS colors (Kato+, 2012)J/AJ/140/1758 : Spectral atlas of peculiar stars (Tomasella+, 2010)J/AJ/140/34 : Classification of nova light curves (Strope+, 2010)J/A+A/420/571 : V1974 Cyg IUE spectroscopy (Cassatella+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/761/34https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/761/34http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/761/34https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/761/34https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/761/34http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/761/34GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/761/34/table3Knots positions, proper motions, and radial velocitiese_PA? Error in pmPAdegstat.errorfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintdx? X (West-East) knot position (1)arcsecpos.cartesian.x;instr.detfloatnullabledy? Y (North-South) knot position (1)arcsecpos.cartesian.y;instr.detfloatnullablepm[0.007/0.6]? Proper motion {mu}mas/yrpos.pmintnullablee_pm[0.002/0.07]? Error in pmmas/yrstat.errorintnullablepmX? X component of proper motionmas/yrpos.pm;pos.cartesian.xintnullablee_pmX? Error in pmXmas/yrstat.errorintnullablepmY? Y component of proper motionmas/yrpos.pm;pos.cartesian.yintnullablee_pmY? Error in pmYmas/yrstat.errorintnullablePA? Knot position angle (2)degpos.posAngfloatnullablepmPA[1/359]? Proper motion position angle {alpha} (3)degpos.pm;pos.posAngfloatnullablee_pmPA? Error in pmPAdegstat.errorfloatnullableRVel[-989/959]? Radial velocity with respect to the systemic velocity (45km/s).km/sphys.veloc;arith.diffintnullableJ/ApJ/761/34/table1Log of the imaging datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateObservation date (start of observing night)time.epoch;obsnullablen_Date[R*] Reference image (R), PSF match (*) (1)meta.notecharr_DateReference of publication (2)meta.ref;pos.framecharJDJulian date at the midpoint of observationsdtime.epochdoubleTelTelescope and InstrumentinstrcharFiltFilter (name or {lambda}_c_/FWHM in {AA})meta.id;instr.filtercharExp[300/7026] Total exposure timestime.duration;obs.exposureintNf[1/31] Number of frames added togethermeta.numberintSeeing[0.2/5] Original seeingarcsecinstr.obsty.seeingfloat