J/A+A/317/712ivo://CDS.VizieR/J/A+A/317/712doi:10.26093/cds/vizier.33170712CDSAltamore A.Cassatella A.1999-02-26T14:08:57Z1999-02-26T15:08:47ZCDS support team

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

cds-question@unistra.frcataclysmic-variable-starsspectroscopyultraviolet-astronomyspectral-energy-distributionIn this paper we study in detail the variability of the symbiotic nova AG Peg in the IUE range during the period 1978-1995. We find that the luminosity of the hot component decreased steadily from about 1850L_{sun}_ in 1978 to 430L_{sun}_ in 1995 while its effective temperature remained nearly constant, 86500+/-1300K. At the same time, the mass loss rate decreased by a factor of 4-5 although the ejection velocity remained constant. The observed fainting of both the narrow and the broad emission lines is ascribed to the decrease of the luminosity and ionizing flux from the hot source. The narrow emission lines and the long wavelength UV continuum show periodic variations arising from a dense and asymmetric nebular region associated with the cool star. Radial velocity variations of the narrow lines indicate that this region is receding from the center of mass of the system, and support the presence of the ablation tail suggested by Penston and Allen (1985MNRAS.212..939P). No periodic flux variations are seen in the short wavelength ultraviolet continuum and in the broad emission lines, which are both formed in the fast wind from the hot component.1997A&A...317..712Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/317/712CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/317/712https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/317/712http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/317/712https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/317/712https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/317/712http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/317/712GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVdefaultJ/A+A/317/712/table3aElectron density from the [SiIII]/[CIII] ratiorecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDJulian datedtime.epochintFSiIIIObserved flux of SiIII] 1893 A line (1)1e-14W.m**-2phot.fluxfloatFCIIIObserved flux of CIII] 1909 A line (1)91e-14W.m**-2phot.fluxfloatlog(Ne)Decimal log of electron densitylog(cm**-3)phys.densityfloatJ/A+A/317/712/table2FES magnitudes and UV fluxesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDJulian datedtime.epochintFESmag? Fine Error Sensor magnitudemagphot.mag;em.UVfloatnullableF1455? Observed flux at 1455 A (1)1e-15W.m**-2.nm**-1phot.fluxfloatnullableF1835? Observed flux at 1835 A (1)1e-15W.m**-2.nm**-1phot.fluxfloatnullableF2855? Observed flux at 2855 A (1)1e-15W.m**-2.nm**-1phot.fluxfloatnullableJ/A+A/317/712/table3bElectron density from the [N III] multipletrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDJulian datedtime.epochintF1748.6Observed flux of N III] 1748.6 A line (1)1e-14W.m**-2phot.fluxfloatF1749.5Observed flux of N III] 1749.5 A line (1)1e-14W.m**-2phot.fluxfloatF1754.0Observed flux of N III] 1754.0 A line (1)1e-14W.m**-2phot.fluxfloatlog(Ne)Decimal log of electron densitylog(cm**-3)phys.densityfloatJ/A+A/317/712/table4Radial velocities of the UV emission linesHJDJulian datedtime.epochintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHRV? Mean heliocentric radial velocity of the CIII] and SiIII] lineskm/sphys.veloc;pos.heliocentricfloatnullablee_HRV? rms uncertainty on HRV1km/sstat.errorfloatnullableRV1? Radial velocity of the HeII 1640A emission linekm/sphys.veloc;pos.heliocentricfloatnullableRV2? Radial velocity of the NIV] 1487A emission linekm/sphys.veloc;pos.heliocentricfloatnullableJ/A+A/317/712/table5HeII Zanstra temperaturesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNote[HL] H: High resolution data, L: Low resolution datameta.notecharHJDJulian datedtime.epochintF1640Flux of the HeII 1640A line (1)1e-14W.m**-2phot.fluxfloatF1335Flux of the continuum around 1335A (2)1e-13W.m**-2.nm**-1phot.fluxfloatF1640/F1335Ratio of F1640 to F1335phot.flux;arith.ratiofloatTZanstra temperatureKphys.temperatureint