J/MNRAS/526/3386ivo://CDS.VizieR/J/MNRAS/526/3386CDSRomanovskaya A.M.Ryabchikova T.A.Pakhomov Yu.V.Korotin S.A.,Sitnova T.M.2023-12-18T08:09:14Z2023-12-18T08:57:23ZCDS support team

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

cds-question@unistra.fra-starschemical-abundancesvisible-astronomyspectroscopyinfrared-astronomyWe present chemical composition and fundamental parameters (the effective temperature, surface gravity and radius) for four sharp-lined A-type stars gamma Gem (HD 41705), omicron Peg (HD 214994), theta Vir (HD 114330) and nu Cap (HD193432). Our analysis is based on a self-consistent model fitting of high-resolution spectra and spectrophotometric observations over a wide wavelength range. We refined the fundamental parameters of the stars with the SME package and verified their accuracy by comparing with the spectral energy distribution and hydrogen line profiles. We found Teff/logg=9190+/-130K/3.56+/-0.08, 9600+/-50K/3.81+/-0.04, 9600+/-140K/3.61+/-0.12, and 10200+/-220K/3.88+/-0.08 for gamma Gem, omicron Peg, theta Vir and nu Cap, respectively. Our detailed abundance analysis employs a hybrid technique for spectrum synthesis based on classical model atmospheres calculated in local thermodynamic equilibrium (LTE) assumption together with the non-LTE (NLTE) line formation for 18 of 26 investigated species. Comparison of the abundance patterns observed in A stars of different types (normal A, Am, Ap) with similar fundamental parameters reveals significant abundance diversity that cannot be explained by the current mechanisms of abundance peculiarity formation in stellar atmospheres. We found a rise of the heavy element (Zn, Sr, Y, Zr, Ba) abundance excess up to +1dex with Teff increasing from 7200 to 10000K, with a further decrease down to solar value at Teff=13000K, indicating that stars with solar element abundances can be found among late B-type stars.2023MNRAS.526.3386Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/526/3386CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/526/3386https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/526/3386http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/526/3386https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/526/3386https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/526/3386http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/526/3386GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/MNRAS/526/3386/linelistLinelist with 491 LTE and NLTE abundances from individual lines in gamma Gem, omicron Peg, theta Vir and nu Cap together with the line atomic parameters and the references to themrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintElElement with ion numbermeta.id;meta.maincharlambdaWavelength in angstrom0.1nmem.wldoubleEiExcitation energyeVphys.atmol.excitationfloatloggfLogarithm of oscillator strengthphys.atmol.oscStrengthfloatr_loggfReferences of loggf, in refs.dat filemeta.ref;pos.framecharr_hfsReferences of hyperfine splitting, in refs.dat filemeta.ref;pos.framecharr_isoReferences of isotope splitting, in refs.dat filemeta.ref;pos.framecharGG-LTE? LTE abundances of gamma Gem (1)phys.abundfloatnullableGG-NLTE? Non-LTE abundances of gamma Gem (1)phys.abundfloatnullableOP-LTE? LTE abundances of omicron Peg (1)phys.abundfloatnullableOP-NLTE? Non-LTE abundances of omicron Peg (1)phys.abundfloatnullableTV-LTE? LTE abundances of theta Vir (1)phys.abundfloatnullableTV-NLTE? Non-LTE abundances of theta Vir (1)phys.abundfloatnullableNC-LTE? LTE abundances of nu Cap (1)phys.abundfloatnullableNC-NLTE? Non-LTE abundances of nu Cap (1)phys.abundfloatnullableJ/MNRAS/526/3386/refsReferences of loggf, hfs and isoDOIDOImeta.bibcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.notecharBibCodeADS bibcodemeta.bib.bibcodecharComCommentsmeta.notecharJ/MNRAS/526/3386/gg-spSpectrum of HD 41705 (gamma Gem) (FEROS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxNormalized fluxphot.flux;arith.ratiodoubleJ/MNRAS/526/3386/op-spSpectrum of HD 214994 (omicron Peg) (ESPaDOnS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxNormalized fluxphot.flux;arith.ratiodoubleJ/MNRAS/526/3386/tv-spaSpectrum of HD 114330 (theta Vir) (ESPaDOnS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxNormalized fluxphot.flux;arith.ratiodoubleJ/MNRAS/526/3386/tv-sp1Spectrum of HD 114330 (theta Vir) (HARPS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxNormalized fluxphot.flux;arith.ratiodoubleJ/MNRAS/526/3386/tv-sp2Spectrum of HD 114330 (theta Vir) (HARPS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxNormalized fluxphot.flux;arith.ratiodoubleJ/MNRAS/526/3386/nc-sp1Spectrum of HD 193432 (nu Cap) 3800-4760{AA} (UVES, R=37000)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxNormalized fluxphot.flux;arith.ratiodoubleJ/MNRAS/526/3386/nc-sp2Spectrum of HD 193432 (nu Cap) 4779-5750{AA} (UVES, R=37000)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxNormalized fluxphot.flux;arith.ratiodoubleJ/MNRAS/526/3386/nc-sp3Spectrum of HD 193432 (nu Cap) 5840-6800{AA} (UVES, R=37000)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxNormalized fluxphot.flux;arith.ratiodoubleJ/MNRAS/526/3386/nc-sp4Spectrum of HD 193432 (nu Cap) 7000-7520{AA} (UVES, R=107000)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxNormalized fluxphot.flux;arith.ratiodoubleJ/MNRAS/526/3386/nc-sp5Spectrum of HD 193432 (nu Cap) 7660-8200{AA} (UVES, R=107000)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxNormalized fluxphot.flux;arith.ratiodoubleJ/MNRAS/526/3386/nc-sp6Spectrum of HD 193432 (nu Cap) 8200-8800{AA} (UVES, R=107000)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength0.1nmem.wldoubleFluxNormalized fluxphot.flux;arith.ratiodouble