J/MNRAS/453/3766ivo://CDS.VizieR/J/MNRAS/453/3766doi:10.26093/cds/vizier.74533766CDSLeBlanc F.Khalack V.Yameogo B.Thibeault C.Gallant I.2024-08-15T20:15:27Z2018-01-15T09:42:23ZCDS support team

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

cds-question@unistra.frpeculiar-variable-starsspectroscopyA portion of main-sequence stars, called chemically peculiar (CP) stars, show important abundance anomalies mainly due to atomic diffusion of the species within these stars. Certain CP stars have hydrodynamically stable atmospheres where atomic diffusion may dominate and lead to vertical abundance stratification there. Recently, Project VeSElkA (a word meaning rainbow in Ukrainian and standing for "Vertical Stratification of Element Abundances") was initiated with the goal to detect vertical stratification of chemical abundances in selected CP stars using high-resolution spectra with large signal-to-noise ratios. The first extensive and detailed series of results from atomic-line analysis is presented here for four stars of Project VeSElkA: HD 71030, HD 95608, HD 116235 and HD 186568. These stars were recently observed with ESPaDOnS at Canada-France-Hawaii Telescope. Strong evidence of iron stratification in the atmospheres of HD 95608 and HD 116235 was found. Chromium also shows a steep abundance gradient in the upper atmospheres of these two stars. No evidence of stratification is found for HD 71030 and HD 186568.2015MNRAS.453.3766Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/453/3766CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/PASP/109/9 : Photometry of chemically peculiar stars (Adelman+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/453/3766https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/453/3766http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/453/3766https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/453/3766https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/453/3766http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/453/3766GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/453/3766/table4aList of selected lines for HD 71030recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintElElementphys.atmol.elementcharlambdaWavelength {lambda} ({AA})0.1nmem.wldoubleloggfOscillator strengthphys.atmol.oscStrengthfloatlogNLog of ratio (N_elem_/N_total_) (1)phys.abunddoublee_logNUncertainty in logNstat.errordoublelogtau? Log of optical depth at 5000{AA} [log({tau}_5000_)] (2)phys.absorption.opticalDepthfloatnullableEiInitial energy E_i_cm**-1phys.energydoubleJ/MNRAS/453/3766/table4bList of selected lines for HD 95608recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintElElementphys.atmol.elementcharlambdaWavelength {lambda} ({AA})0.1nmem.wldoubleloggfOscillator strengthphys.atmol.oscStrengthfloatlogNLog of ratio (N_elem_/N_total_) (1)phys.abunddoublee_logNUncertainty in logNstat.errordoublelogtau? Log of optical depth at 5000{AA} [log({tau}_5000_)] (2)phys.absorption.opticalDepthfloatnullableEiInitial energy E_i_cm**-1phys.energydoubleJ/MNRAS/453/3766/table4cList of selected lines for HD 116235logNLog of ratio (N_elem_/N_total_) (1)phys.abunddoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintElElementphys.atmol.elementcharlambdaWavelength {lambda} ({AA})0.1nmem.wldoubleloggfOscillator strengthphys.atmol.oscStrengthfloate_logNUncertainty in logNstat.errordoublelogtau? Log of optical depth at 5000{AA} [log({tau}_5000_)] (2)phys.absorption.opticalDepthfloatnullableEiInitial energy E_i_cm**-1phys.energydoubleJ/MNRAS/453/3766/table4dList of selected lines for HD 186568ElElementphys.atmol.elementcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambdaWavelength {lambda} ({AA})0.1nmem.wldoubleloggfOscillator strengthphys.atmol.oscStrengthfloatlogNLog of ratio (N_elem_/N_total_) (1)phys.abunddoublee_logNUncertainty in logNstat.errordoublelogtau? Log of optical depth at 5000{AA} [log({tau}_5000_)] (2)phys.absorption.opticalDepthfloatnullableEiInitial energy E_i_cm**-1phys.energydouble