J/A+A/310/893ivo://CDS.VizieR/J/A+A/310/893doi:10.26093/cds/vizier.33100893CDSBakker E.J.Waters L.B.F.M.Lamers H.J.G.L.M.Trams N.R.,van der Wolf F.L.A.1997-12-09T16:42:47Z1997-12-09T17:42:40ZCDS support team

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

cds-question@unistra.fratomic-physicsline-intensitiesWe present the detection of molecular absorption lines in the optical spectrum of the post-AGB star HD 56126. The C_2_ Phillips A^1^{PI}_u_-X^1^{SIGMA}^+^_g_(1,0), (2,0), and (3,0); Swan d^3^{PI}_g_-a^3^{PI}_u_(0,0) and (1,0); and CN Red system A^2^{PI}-X^2^{SIGMA}^+^ (1,0), (2,0), (3,0), and (4,0) bands have been identified. From the identification of the molecular bands we find an expansion velocity of 8.5+/-0.6km/s independent of excitation condition or molecular specie. On the basis of the expansion velocity, rotational temperatures, and molecular column densities we argue that the line-forming region is the AGB remnant. This is in agreement with the expansion velocity derived from the CO lines. We find column densities of logN_C_2__=15.3+/-0.3cm^-2^ and logN_CN_=15.5+/-0.3cm^-2^, and rotational temperatures of T_rot_=242+/-20K and T_rot_=24+/-5K respectively for C_2_ and CN. By studying molecular line absorption in optical spectra of post-AGB stars we have found a new tracer of the AGB remnant. From comparison with the results of CO and IR observations it is possible to obtain information on non-spherical behavior of the AGB remnant. Using different molecules with different excitation conditions it should be possible to study the AGB remnant as a function of the distance to the star, and thus as a function of the evolutionary status of the star on the AGB.1996A&A...310..893Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/310/893CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/310/893https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/310/893http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/310/893https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/310/893https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/310/893http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/310/893GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/310/893/table13(1,0) C_2_ Phillips bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintB(J'')Line identificationmeta.idcharLabLambdaLaboratory wavelength in air0.1nmem.wl;phys.atmol.transitiondoubleObsLambda? Observed wavelength0.1nmem.wldoubleWlambda? Observed equivalent width0.1pmspect.line.eqWidthfloatf(J'J'')10+4Oscillator strengthphys.atmol.wOscStrengthfloatN(J'')? Column density1e+12cm**-2phys.columnDensityfloatRemRemarksmeta.notecharJ/A+A/310/893/table14(2,0) C_2_ Phillips bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintB(J'')Line identificationmeta.idcharLabLambdaLaboratory wavelength in air0.1nmem.wl;phys.atmol.transitiondoubleObsLambda? Observed wavelength0.1nmem.wldoubleWlambda? Observed equivalent width0.1pmspect.line.eqWidthfloatf(J'J'')10+4Oscillator strengthphys.atmol.wOscStrengthfloatN(J'')? Column density1e+12cm**-2phys.columnDensityfloatRemRemarksmeta.notecharJ/A+A/310/893/table17(2,0) CN Red bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBLine identification, branch namemeta.idcharJ''Rotational quantum number, total angular momentum including spin (1)phys.atmol.qncharN''Rotational quantum number, total angular momentum excluding spin (1)phys.atmol.qnintLabLambdaLaboratory wavelength of transition in air0.1nmem.wl;phys.atmol.transitiondoubleObsLambda? Observed wavelength0.1nmem.wlfloatn_ObsLambdab=blend, N=NOmeta.notecharW? Observed equivalent width0.1pmspect.line.eqWidthfloatf(J'J'')10+4Oscillator strengthphys.atmol.wOscStrengthfloatN(N''J'')? Column density1e+12cm**-2phys.columnDensityfloatRemRemarksmeta.notecharJ/A+A/310/893/table18(3,0) CN Red bandRemRemarksmeta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBLine identification, branch namemeta.idcharJ''Rotational quantum number, total angular momentum including spin (1)phys.atmol.qncharN''Rotational quantum number, total angular momentum excluding spin (1)phys.atmol.qnintLabLambdaLaboratory wavelength of transition in air0.1nmem.wl;phys.atmol.transitiondoubleObsLambda? Observed wavelength0.1nmem.wlfloatn_ObsLambdab=blend, N=NOmeta.notecharW? Observed equivalent width0.1pmspect.line.eqWidthfloatf(J'J'')10+4Oscillator strengthphys.atmol.wOscStrengthfloatN(N''J'')? Column density1e+12cm**-2phys.columnDensityfloatJ/A+A/310/893/table15(3,0) C_2_ Phillips bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintB(J'')Line identificationmeta.idcharLabLambdaLaboratory wavelength in air0.1nmem.wl;phys.atmol.transitiondoubleObsLambda? Observed wavelength0.1nmem.wldoubleWlambda? Observed equivalent width0.1pmspect.line.eqWidthfloatf(J'J'')10+4Oscillator strengthphys.atmol.wOscStrengthfloatN(J'')? Column density1e+12cm**-2phys.columnDensityfloatRemRemarksmeta.notecharJ/A+A/310/893/table16(1,0) CN Red bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBLine identification, branch namemeta.idcharJ''Rotational quantum number, total angular momentum including spin (1)phys.atmol.qncharN''Rotational quantum number, total angular momentum excluding spin (1)phys.atmol.qnintLabLambdaLaboratory wavelength of transition in air0.1nmem.wl;phys.atmol.transitiondoubleObsLambda? Observed wavelength0.1nmem.wlfloatn_ObsLambdab=blend, N=NOmeta.notecharW? Observed equivalent width0.1pmspect.line.eqWidthfloatf(J'J'')10+4Oscillator strengthphys.atmol.wOscStrengthfloatN(N''J'')? Column density1e+12cm**-2phys.columnDensityfloatRemRemarksmeta.notechar