J/MNRAS/361/1102ivo://CDS.VizieR/J/MNRAS/361/1102doi:10.26093/cds/vizier.73611102CDSSim S.A.Jordan C.2024-07-01T20:15:02Z2006-07-08T21:28:02ZCDS support team

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

cds-question@unistra.frlate-type-starsspectroscopyultraviolet-astronomyastronomical-modelsstellar-atmospheresMeasurements of ultraviolet line fluxes from Space Telescope Imaging Spectrograph and Far-Ultraviolet Spectroscopic Explorer spectra of the K2-dwarf eps Eri are reported. These are used to develop new emission measure distributions and semi-empirical atmospheric models for the chromosphere and lower transition region of the star. These models are the most detailed constructed to date for a main-sequence star other than the Sun. New ionization balance calculations, which account for the effect of finite density on dielectronic recombination rates, are presented for carbon, nitrogen, oxygen and silicon. The results of these calculations are significantly different from the standard Arnaud & Rothenflug ion balance, particularly for alkali-like ions. The new atmospheric models are used to place constraints on possible first ionization potential (FIP)-related abundance variations in the lower atmosphere and to discuss limitations of single-component models for the interpretation of certain optically thick line fluxes.2005MNRAS.361.1102Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/361/1102CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/612/481 : Optical brightness of {epsilon} Eri dust ring (Proffitt+, 2004)J/A+A/416/281 : X-ray spectra of 4 cool stars (Sanz-forcada+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/361/1102https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/361/1102http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/361/1102https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/361/1102https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/361/1102http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/361/1102GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapUVdefaultJ/MNRAS/361/1102/tablebParameters for the atmospheric models A, B and CrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintModel[A-C] Modelmeta.notecharlogmcolColumn mass density,g.cm**-2phys.columnDensitydoublelogTeElectron temperatureKphys.temperature.electron;phys.electronfloatlogNeElectron number densitycm**-3meta.id;meta.mainfloatlogNHHydrogen number densitycm**-3meta.idfloatVtMost-probable microturbulent velocitykm/sphys.velocfloatJ/MNRAS/361/1102/em_linesCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIonphys.atmol.ionStagecharn_Ion[a] Note (1)meta.notecharTransTransitionmeta.id;phys.atmol.transitionspmeta.id;instr.telcharlambda0Rest wavelength (2)0.1nmem.wldoublen_lambda0[bl] Note for blend (3)meta.notecharFluxFlux at Earth1e-16W.m**-2phot.fluxdoublee_Fluxrms uncertainty on Flux1e-16W.m**-2stat.error;phot.fluxfloatn_Flux[bl?] Note for blend (3)meta.notecharJ/MNRAS/361/1102/tableaLogarithmic ionization fractions computed for C, N, O and SilogTeElectron temperatureKphys.temperature.electron;phys.electronfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIfCII? C II Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfCIII? C III Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfCIV? C IV Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfNIII? N III Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfNIV? N IV Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfNV? N V Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfOIII? O III Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfOIV? O IV Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfOV? O V Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfOVI? O VI Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfSiII? Si II Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfSiIII? Si III Ionization fraction (1)phys.luminosity;arith.ratiofloatnullableIfSiIV? Si IV Ionization fraction (1)phys.luminosity;arith.ratiofloatnullable