J/A+A/536/A27ivo://CDS.VizieR/J/A+A/536/A27doi:10.26093/cds/vizier.35360027CDSSkopal A.Tarasova T.N.Carikova Z.Castellani F.Cherini G.,Dallaporta S.Frigo A.Marangoni C.Moretti S.Munari U.Righetti G.L.,Siviero A.Tomaselli S.Vagnozzi A.Valisa P.2017-06-26T11:49:55Z2011-12-05T12:44:59ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsccd-photometryinfrared-photometryvisible-astronomybroad-band-photometryAX Per is an eclipsing symbiotic binary. During active phases, deep narrow minima are observed in its light curve, and the ionization structure in the binary changes significantly. From ~2007.5, AX Per entered a new active phase. We aim to derive the ionization structure in the binary and its changes during the recent active phase. We used optical high- and low-resolution spectroscopy and UBVRcIc photometry. We modeled the SED in the optical and broad wings of the H alpha line profile during the 2007-10 higher level of the AX Per activity. After 10 orbital cycles (~18.6 years), we again measured the eclipse of the hot component by its giant companion in the light curve. We derived a radius of 27+/-2R_{sun}_ for the eclipsed object and 115+/-2R_{sun}_ for the eclipsing cool giant. The new active phase was connected with a significant enhancement of the hot star wind. From quiescence to activity, the mass-loss rate increased from ~9E-8 to ~3E-6M_{sun}_/yr, respectively. The wind causes the emission of the He++ zone, located in the vicinity of the hot star, and also is the reason for the fraction of the [OIII] zone at farther distances. Simultaneously, we identified a variable optically thick warm (T_eff_~6000K) source that contributes markedly to the composite spectrum. The source was located at the hot star's equator and has the form of a flared disk, whose outer rim simulates the warm photosphere. The formation of the neutral disk-like zone around the accretor during the active phase was connected with its enhanced wind. It is probable that this connection represents a common origin of the warm pseudophotospheres that are indicated during the active phases of symbiotic stars.2011A&A...536A..27Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/536/A27CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/367/199 : UBVR photometry of AX Per (Skopal+, 2001)J/MNRAS/399/2139 : CI Cyg BVRcIc light curves (Siviero+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/536/A27https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/536/A27http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/536/A27https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/536/A27https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/536/A27http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/536/A27GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap3.322582951404819e-19 3.852589004194616e-19OpticalInfrareddefaultJ/A+A/536/A27/table5Dereddened emission line fluxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datetime.epochdoubleDateObservation datetime.epoch;obsnullable[OIII]1? Dereddened [OIII] (4363{AA}) emission line fluxfW.m**-2phot.flux;em.line.OIII;spect.linefloatnullableHeIIDereddened HeII (4686{AA}) emission line fluxfW.m**-2phot.flux;spect.linefloatHbetaDereddened H{beta} emission line fluxfW.m**-2phot.flux;em.line.Hbetafloat[OIII]2? Dereddened [OIII] (4950{AA}) emission line fluxfW.m**-2phot.flux;em.line.OIII;spect.linefloatnullable[OIII]3? Dereddened [OIII] (5007{AA}) emission line fluxfW.m**-2phot.flux;em.line.OIII;spect.linefloatnullableHeI? Dereddened HeI (5875{AA}) emission line fluxfW.m**-2phot.flux;spect.linefloatnullable[FeVII]? Dereddened [FeVII] (6087{AA}) emission line fluxfW.m**-2phot.flux;spect.linefloatnullableHalphaDereddened H{alpha} emission line fluxfW.m**-2phot.flux;em.line.HalphafloatRes[h/l] high- or low-resolution spectrummeta.codecharJ/A+A/536/A27/table2Photometric B, V, Rc, Ic CCD observations of AX PerseirecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelTelescope identification in the ANS (1)meta.id;instr.telintHJDHeliocentric Julian Datetime.epochdoubleDateObservation datetime.epoch;obsnullableVmagJohnson V magnitudemagphot.mag;em.opt.Vfloate_VmagError in Vmagmagstat.error;phot.mag;em.opt.VfloatB-V? Johnson B-V colour indexmagphot.color;em.opt.B;em.opt.Vfloatnullablee_B-V? Error in B-Vmagstat.error;phot.color;em.opt.BfloatnullableV-Rc? Johnson-Cousins V-Rc colour indexmagphot.color;em.opt.V;em.opt.Rfloatnullablee_V-Rc? Error in V-Rcmagstat.error;phot.color;em.opt.VfloatnullableV-Ic? Johnson-Cousins V-Ic colour indexmagphot.color;em.opt.V;em.opt.Ifloatnullablee_V-Ic? Error in V-Icmagstat.error;phot.color;em.opt.VfloatnullableJ/A+A/536/A27/table3Photoelectric U, B, V observations of AX Persei taken at the Skalnate Pleso ObservatoryUmagMagnitude Umagphot.mag;em.opt.UfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datetime.epochdoubleDateObservation datetime.epoch;obsnullableBmag? Magnitude Bmagphot.mag;em.opt.BfloatnullableVmag? Magnitude Vmagphot.mag;em.opt.Vfloatnullable