J/AZh/84/714ivo://CDS.VizieR/J/AZh/84/714CDSKlochkova V.G.Chentsov E.L.Tavolzhanskaya M.S.Panchuk V.E.2008-05-29T11:45:34Z2008-05-29T11:43:01ZCDS support team

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

cds-question@unistra.frvariable-starsspectroscopyBased on high-resolution observations (R=60000 and 75000), we have studied the optical spectral variability of the star BD+48 1220, identified with the IR-source IRAS 05040+4820. We have measured the equivalent widths of numerous absorption lines of neutral atoms and ions at wavelengths from 4500 to 6760{AA}, as well as the corresponding radial velocities. We use model atmospheres to determine the effective temperature Teff=7900K, surface gravity log g=0.0, microturbulence velocity xi_t_=6.0, and the abundances for 16 elements. The star's metallicity differs little from the solar value: [Fe/H]=-0.10dex. The main peculiarity of the chemical composition of the star is a large He-excess, derived from the HeI 5876{AA} absorption, [He/H]=+1.04, and the equally large O-excess, [O/Fe]=+0.72dex. The C-excess is small, [C/Fe]=+0.09dex, and the ratio [C/O]<=1. We obtained a revised relation for the light-metal abundances: [Na/Fe]=+0.87 with [Mg/Fe]=-0.31. The barium abundance is low, [Ba/Fe]=-0.84. The radial velocity of the star measured from photospheric absorption lines over three years of observations varies in the interval V_{sun}_=-(7-15)km/s. Time variable differential line shifts have been revealed. The entire set of available data (the luminosity Mv~-5mag, velocity V_lsr_~-20km/s, metallicity [Fe/H]=-0.10, and peculiarities of the optical spectrum and chemical composition) confirms the status of BD+48 1220 as a post-AGB star with He- and O-excesses belonging to the Galactic disk.2007AZh....84..714Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AZh/84/714CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AZh/84/714https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AZh/84/714http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AZh/84/714https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AZh/84/714https://vizier.iucaa.in/viz-bin/votable?-source=J/AZh/84/714http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AZh/84/714GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AZh/84/714/tablea1Residual line intensities in fractions of continuum and HRV in spectra of BD+48 1220 obtained on various datesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintElElement with multiplet number (1)meta.id;meta.maincharLambda? Wavelength expressed in Angstroem0.1nmem.wlfloatnullableu_Lambda[:] Uncertainty flag on Lambdameta.code.errorcharRes1? Residual line intensity for observation on 2002-12-02spect.line.intensityfloatnullableu_Res1[:] Uncertainty flag on Res1meta.code.errorcharHRV1? Heliocentric radial velocity for observation on 2002-12-02km/sspect.dopplerVeloc;pos.heliocentricfloatnullableu_HRV1[:] Uncertainty flag on HRV1meta.code.errorcharRes2? Residual line intensity for observation on 2003-09-09spect.line.intensityfloatnullableu_Res2[:] Uncertainty flag on Res2meta.code.errorcharHRV2? Heliocentric radial velocity for observation on 2003-09-09km/sspect.dopplerVeloc;pos.heliocentricfloatnullableu_HRV2[:] Uncertainty flag on HRV2meta.code.errorcharRes3? Residual line intensity for observation on 2004-01-10spect.line.intensityfloatnullableu_Res3[:] Uncertainty flag on Res3meta.code.errorcharHRV3? Heliocentric radial velocity for observation on 2004-01-10km/sspect.dopplerVeloc;pos.heliocentricfloatnullableu_HRV3[:] Uncertainty flag on HRV3meta.code.errorcharRes4? Residual line intensity for observation on 2004-03-08spect.line.intensityfloatnullableu_Res4[:] Uncertainty flag on Res4meta.code.errorcharHRV4? Heliocentric radial velocity for observation on 2004-03-08km/sspect.dopplerVeloc;pos.heliocentricfloatnullableu_HRV4[:] Uncertainty flag on HRV4meta.code.errorcharn_HRV4[em] emissionmeta.notecharJ/AZh/84/714/table4Elemental abundances in the atmosphere of BD+48 1220 (Teff=7900K, logg=0.0, xi_t_6.0)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEElementphys.atmol.elementcharlogeps(E)Solar abundance for E element (1)phys.abundfloatIonIon identificationmeta.id;phys.atmol.ionStagecharlogeps(X)Star abundance for X element (1)phys.abundfloate_logeps(X)? rms uncertainty on logeps(X)stat.errorfloatnullableo_logeps(X)Number of lines usedmeta.numberint[X/Fe]Solar [X/Fe] abundance value (2)log(Sun)phys.abundfloatJ/AZh/84/714/tablea2Atomic parameters of lines in spectrum of BD+48 1220 obtained on 2004-04-10, and corresponding atmospheric elemental abundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonElementphys.atmol.elementcharLambdaWavelength expressed in Angstroem0.1nmem.wldoubleEPExcitation potentials of the lower leveleVphys.atmol.excitation;phys.atmol.levelfloatloggfOscillator strength (log gf)phys.atmol.oscStrengthfloatEWEquivalent width0.1nmspect.line.eqWidthintlog(eps)Abundance of the element (1)phys.abundfloat