J/A+A/338/1006ivo://CDS.VizieR/J/A+A/338/1006doi:10.26093/cds/vizier.33381006CDSIijima T.Rosino L.Della Valle M.1998-11-07T16:51:35Z1998-11-07T17:50:53ZCDS support team

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

cds-question@unistra.frnovaeline-intensitiesThe monitoring of spectral evolution of the very slow nova V723 Cas started at the Asiago Astrophysical Observatory just on the announcement of discovery. In this paper the spectral evolution during the long pre-maximum stage, which lasted from August to December 1995, is reported. Emission lines of H I and Fe II were prominent in the early stage. Most of the lines were accompanied by P Cygni type absorption components. The emission lines gradually weakened with time and the absorption components developed. The mean of the blue-shifts of the absorption components with respect to the emissions was about -126km/s in September and -96km/s in December 1995. Some lines of Fe I, Fe II, Y II, Sc II, Ba II, etc. appeared in the later stage. All emission lines, except for H{alpha}, once nearly disappeared in November when the nova slightly brightened to V=~8.6. Some emission lines appeared again several days before the beginning of the final rise to maximum luminosity, then a pure absorption spectrum of F type supergiant was seen on the maximum of V=~7.1 at the middle of December. The absorption components of Si II lines at 634.7 and 637.1nm showed fairly different profiles from those of the other metallic lines, which suggests a complicated gas motion in the atmosphere. The distance and the absolute magnitude at maximum are estimated to be 2.95+/-0.7kpc and M_V_(max)=-6.1+/-0.5, respectively. The mass of the white dwarf in this system may be about 0.58+/-0.07M_{sun}_.1998A&A...338.1006Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/338/1006CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/338/1006https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/338/1006http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/338/1006https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/338/1006https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/338/1006http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/338/1006GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/338/1006/table5Wavelengths, equivalent widths and identifications of all emission and absorption lines of Nova (V723) Cas 1995 observed on 1995 Sept. 12 and Dec. 4recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda1? Measured wavelength on 12/09/950.1nmem.wlfloatnullableEW1? Equivalent width (12/09/95)0.1nmspect.line.eqWidthfloatnullableu_EW1Uncertainty flag on EW1meta.code.errorcharlambda2? Measured wavelength on 04/12/950.1nmem.wlfloatnullableEW2? Equivalent width (04/12/95)0.1nmspect.line.eqWidthfloatnullableu_EW2Uncertainty flag on EW2meta.code.errorcharIdentIdentification (1)meta.idchar