J/A+A/544/A26ivo://CDS.VizieR/J/A+A/544/A26doi:10.26093/cds/vizier.35440026CDSIijima T.2017-03-15T07:03:00Z2012-07-27T09:55:38ZCDS support team

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

cds-question@unistra.frvariable-starsspectroscopyHigh- and low-resolution optical spectra of CI Aql were obtained during the outburst in 2000. Multiple absorption components of HI and FeII lines were detected at the early decline stage. Their radial velocities were roughly -2500km/s, -2200km/s , -1700km/s, and -1400km/s, among which only the last components were likely still accelerating during the early decline stage. Prominent emission lines of [OIII] and [NII] appeared about one month after light maximum. The duration of the nebular stage, however, was only one month and a few weeks. The ejected gas shells seem to have started to shrink about 70 days after light maximum. The amount of interstellar extinction is estimated to be E(B-V)=0.92+/-0.15 from the equivalent widths of the diffuse interstellar absorption bands. The helium abundance in the ejecta is estimated to be N(He)=0.19+/-0.05 and the mass of the ejecta to be about 2x10^-6^M_{sun}_. This object has been classified as a U Sco type recurrent nova, but its spectral evolution during the outburst resembled those of T Pyx type recurrent novae. It is doubtful whether the peak of m_V_~9mag on 2000 May 5 was the true light maximum or an earlier brighter peak had been overlooked, because the spectral data suggest that the ejections of gas shells occurred prior to the discovery of the outburst on 2000 April 28.2012A&A...544A..26Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/544/A26CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/544/A26https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/544/A26http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/544/A26https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/544/A26https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/544/A26http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/544/A26GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapAssociated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/544/A26OpticaldefaultJ/A+A/544/A26/table1Log of spectroscopic observations of CI AqlrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsObservation datestime.epoch;obsnullableJDJulian date (JD-2450000)dtime.epochfloatDaysNumber of days from light maximum on 2005 May 5 (JD=2451669.5)dtime.intervalfloatTexpExposure timestime.duration;obs.exposureintInstInstrumentmeta.id;instrcharRangeSpectral range (nm)instr.bandwidthcharSkySky information (cloudy)meta.notecharFileNameName of the file with spectrummeta.id;meta.filecharspDisplay the spectrummeta.ref.urlcharFITSDownload the FITS filemeta.ref.urlchar