J/MNRAS/486/3266ivo://CDS.VizieR/J/MNRAS/486/3266CDSPurandardas M.Goswami A.Goswami P.P.Shejeelammal J.Masseron T.2023-11-02T14:28:19Z2023-11-02T15:27:26ZCDS support team

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

cds-question@unistra.frpeculiar-variable-starschemical-abundanceseffective-temperatureradial-velocityvisible-astronomyElemental abundances of CH stars can provide observational constraints for theoretical studies on the nucleosynthesis and evolution of low- and intermediate-mass stars. However, available abundance data in literature are quite scanty. In our pursuit to generate a homogeneous data base of elemental abundances of CH stars we have performed a detailed chemical abundance study for a sample of 12 potential CH star candidates based on high-resolution spectroscopy. We present first time abundance analysis for the objects HE0308-1612, CD-281082, HD30443, and HD87853. For the other objects, although limited information is available, detailed chemical composition studies are missing. Our analysis shows CD-281082 to be a very metal-poor object with [Fe/H]=-2.45 and enriched in carbon with [C/Fe]=2.19. With a ratio of [Ba/Eu]~0.02 the star satisfies the classification criteria of a CEMP-r/s star. The objects CD-382151 with [Fe/H]=-2.03 and HD30443 with [Fe/H]~-1.68 are found to show the characteristic properties of CH stars. HE0308-1612 and HD87853 are found to be moderately metal poor with [Fe/H]~-0.73; while HE0308-1612 is moderately enhanced with carbon ([C/Fe]~0.78) and shows the spectral properties of CH stars, the abundance of carbon could not be estimated for HD87853. Among the two moderately metal-poor objects, HD87080 ([Fe/H]=-0.48) shows near solar carbon abundance, and HD176021 ([Fe/H]=-0.63) is mildly enhanced in carbon with [C/Fe]=0.52. HD176021 along with HD202020 a known binary, exhibit the characteristic properties of CH stars as far as the heavy element abundances are concerned. Five objects in our sample show spectral properties that are normally seen in barium stars.2019MNRAS.486.3266Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/486/3266CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/486/3266https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/486/3266http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/486/3266https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/486/3266https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/486/3266http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/486/3266GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/486/3266/table1 (Basic data for the programme stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/486/3266/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/486/3266/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/486/3266/table1?GETtext/xml+votable180.050000true47.6127917-16.01113890.0055555555555555566/1236 27535 34166 34216 35960 36624 38792 39851 43860 45745 47396 48998https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/486/3266?format=asciiOpticaldefaultJ/MNRAS/486/3266/table1Basic data for the programme starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainBmagMagnitude on the B-bandmagphot.mag;em.opt.BfloatVmag? Magnitude on the V-bandmagphot.mag;em.opt.VfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharTexpExposure timestime.duration;obs.exposureintJmagMagnitude on the J-bandmagphot.mag;em.IR.JfloatHmagMagnitude on the H-bandmagphot.mag;em.IR.HfloatKmagMagnitude on the K-bandmagphot.mag;em.IR.KfloatNfr? Number of frames takenmeta.numberintnullableDateDate of observation (D-M-Y)time.epochcharInstSource of spectrum (1)meta.id;instrcharJ/MNRAS/486/3266/table2Temperatures from photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharTeffJK? Photometric effective temperature estimated using (J-K) colour as temperature indicatorKphys.temperature.effectivefloatnullableTeffJH1? Photometric effective temperature estimated using (J-H) colour as temperature indicator and [Fe/H]=-0.05Kphys.temperature.effectivefloatnullableTeffJH2? Photometric effective temperature estimated using (J-H) colour as temperature indicator and [Fe/H]=-0.5Kphys.temperature.effectivefloatnullableTeffJH3? Photometric effective temperature estimated using (J-H) colour as temperature indicator and [Fe/H]=-1.5Kphys.temperature.effectivefloatnullableTeffVK1? Photometric effective temperature estimated using (V-K) colour as temperature indicator and [Fe/H]=-0.05Kphys.temperature.effectivefloatnullableTeffVK2? Photometric effective temperature estimated using (V-K) colour as temperature indicator and [Fe/H]=-0.5Kphys.temperature.effectivefloatnullableTeffVK3? Photometric effective temperature estimated using (V-K) colour as temperature indicator and [Fe/H]=-1.5Kphys.temperature.effectivefloatnullableTeffBV1? Photometric effective temperature estimated using (B-V) colour as temperature indicator and [Fe/H]=-0.05Kphys.temperature.effectivefloatnullableTeffBV2? Photometric effective temperature estimated using (B-V) colour as temperature indicator and [Fe/H]=-0.5Kphys.temperature.effectivefloatnullableTeffBV3? Photometric effective temperature estimated using (B-V) colour as temperature indicator and [Fe/H]=-1.5Kphys.temperature.effectivefloatnullableTeffspEstimated spectroscopic temperatureKphys.temperature.effectiveintJ/MNRAS/486/3266/table3Derived atmospheric parameters and radial velocities of the programme starsRVlit? Radial velocity from litteraturekm/sphys.veloc;pos.heliocentricfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharTeffEffective temperature (1)Kphys.temperature.effectiveintloggspSurface gravity (2)log(cm.s**-2)phys.gravityfloatvtMicroturbulent velocity (3)km/sphys.velocfloat[FeI/H]FeI to hydrogen abundance ratiophys.abund.X;arith.ratiofloate_[FeI/H]Error on [FeI/H]stat.error;phys.abundfloat[FeII/H]FeII to hydrogen abundance ratiophys.abund.X;arith.ratiofloate_[FeII/H]? Error on [FeII/H]stat.error;phys.abundfloatnullableRVRadial velocity estimated in this workkm/sphys.veloc;pos.heliocentricfloate_RVError on RVkm/sstat.errorfloatn_RVInstrument used to estimate RVmeta.notechare_RVlit? Error on RVlitkm/sstat.errorfloatnullableJ/MNRAS/486/3266/table4Estimates of logg using parallax methodrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharplxParallax from Gaia DR2 (Gaia Collaboration 2018A&A...616A...1G, Cat. I/345)maspos.parallax.trigfloate_plxError on plxmasstat.error;pos.parallaxfloatMbol? Bolometric magnitudemagphys.magAbs.bolfloatnullablee_Mbol? Error on Mbolmagstat.errorfloatnullablelogLstar? Star luminositylog(solLum)phys.luminosityfloatnullablee_logLstar? Error on Lstarlog(solLum)stat.errorfloatnullablelogMstar? Star mass (1)log(solMass)phys.massfloatnullablee_logMstar? Error on Mstarlog(solMass)stat.errorfloatnullablelogg? Surface gravity estimated using the parallax method (2)log(cm.s**-2)pos.parallaxfloatnullablee_logg? Error on logglog(cm.s**-2)stat.errorfloatnullableloggspSpectroscopic surface gravitylog(cm.s**-2)phys.gravityfloatAge? Star age derived from the star location in the HR diagramGyrtime.agefloatnullableJ/MNRAS/486/3266/table5Comparison of our estimated stellar parameters with literature valuesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatvtMicroturbulent velocitykm/sphys.velocfloat[FeI/H]FeI to hydrogen abundance ratiophys.abund.X;arith.ratiofloatf_[FeI/H][a] Flag on [FeI/H] (1)meta.codechar[FeII/H]? FeII to hydrogen abundance ratiophys.abund.X;arith.ratiofloatnullableRefReferences for the presented stellar parameters (2)meta.refintJ/MNRAS/486/3266/table6Estimates of [Fe/H], [ls/Fe], [hs/Fe], [hs/ls], and C/OrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.mainchar[Fe/H]Iron to hydrogen abundance ratiophys.abund.Fe;arith.ratiofloat[ls/Fe]Light s-process elements (Sr,Y,Zr) to iron abundance ratiophys.abundfloat[hs/Fe]Heavy s-process elements (Ba, La, Ce, Nd, Sm) to iron abundance ratiophys.abundfloat[hs/ls]Light to heavy s-process elements abundance ratiophot.colorfloat[C/O]? Carbon to oxygen abundance ratiophys.abundfloatnullableJ/MNRAS/486/3266/table7Spatial velocity and probability estimates for the programme starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharULSRU-component of space velocity relative to the local standard of rest (LSR)km/sphys.velocfloate_ULSRError on ULSRkm/sstat.errorfloatVLSRV-component of space velocity relative to the local standard of rest (LSR)km/sphys.veloc;pos.lsrfloate_VLSRError on VLSRkm/sstat.error;phys.veloc;pos.lsrfloatWLSRW-component of space velocity relative to the local standard of rest (LSR)km/sphys.velocfloate_WLSRError on WLSRkm/sstat.errorfloatVtotTotal space velocitykm/sphys.velocfloate_VtotError on Vtotkm/sstat.errorfloatpthinProbability for a star's membership into the thin disc (1)stat.fit.goodnessfloatpthickProbability for a star's membership into the thick disc (1)stat.fit.goodnessfloatphaloProbability for a star's membership into the halo (1)stat.fit.goodnessfloatPopPopulationmeta.codecharJ/MNRAS/486/3266/table8Comparison of the abundances of our programme stars with the literature valuesNameStar namemeta.id;meta.mainchar[FeI/H]? FeI to hydrogen abundance ratiophys.abund.X;arith.ratiofloatnullable[FeII/H]? FeII to hydrogen abundance ratiophys.abund.X;arith.ratiofloatnullable[Fe/H]? Iron to hydrogen abundance ratiophys.abund.Fe;arith.ratiofloatnullable[Sr/Fe]? Sr to iron abundance ratiophys.abundfloatnullable[Y/Fe]Y to iron abundance ratiophys.abundfloat[Zr/Fe]? Zr to iron abundance ratiophys.abundfloatnullable[BaII/Fe]? BaII to iron abundance ratiophys.abundfloatnullable[LaII/Fe]? LaII to iron abundance ratiophys.abundfloatnullable[CeII/Fe]? CeII to iron abundance ratiophys.abundfloatnullable[PrII/Fe]? PrII to iron abundance ratiophys.abundfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[NdII/Fe]NdII to iron abundance ratiophys.abundfloat[SmII/Fe]? SmII to iron abundance ratiophys.abundfloatnullable[EuII/Fe]? EuII to iron abundance ratiophys.abundfloatnullableRefReferences (1)meta.refintJ/MNRAS/486/3266/tablea1Elemental abundances in HE 0308-1612, CD 28 1082, and HD 29370recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIonphys.atmol.ionStagecharZIon numberphys.atmol.numberintlogepsSSolar abundance (G1)phys.abundfloatlogeps1? HE 0308-1612 log{epsilon} abundancephys.abundfloatnullablee_logeps1? HE 0308-1612 log{epsilon} abundancestat.errorfloatnullablen_logeps1[s] s for synthmeta.notecharo_logeps1? Number of lines used for the logeps1 determinationmeta.numberintnullable[X/H]1? HE 0308-1612 [X/H] abundancephys.abundfloatnullable[X/Fe]1? HE 0308-1612 [X/Fe] abundancephys.abundfloatnullablelogeps2? CD 28 1082 log{epsilon} abundancephys.abundfloatnullablee_logeps2? CD 28 1082 log{epsilon} abundancestat.errorfloatnullablen_logeps2[s] s for synthmeta.notecharo_logeps2? Number of lines used for the logeps2 determinationmeta.numberintnullable[X/H]2? CD 28 1082 [X/H] abundancephys.abundfloatnullable[X/Fe]2? CD 28 1082 [X/Fe] abundancephys.abundfloatnullablelogeps3? HD 29370 log{epsilon} abundancephys.abundfloatnullablee_logeps3? HD 29370 log{epsilon} abundancestat.errorfloatnullablen_logeps3[s] s for synthmeta.notecharo_logeps3? Number of lines used for the logeps3 determinationmeta.numberintnullable[X/H]3? HD 29370 [X/H] abundancephys.abundfloatnullable[X/Fe]3? HD 29370 [X/Fe] abundancephys.abundfloatnullableJ/MNRAS/486/3266/tablea2Elemental abundances in HD 30443, CD-38 2151, and HD 50264[X/H]6? HD 50264 [X/H] abundancephys.abundfloatnullable[X/Fe]6? HD 50264 [X/Fe] abundancephys.abundfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIonphys.atmol.ionStagecharZIon numberphys.atmol.numberintlogepsSSolar abundance (G1)phys.abundfloatlogeps? HD 30443 log{epsilon} abundancephys.abundfloatnullablee_logeps? HD 30443 log{epsilon} abundancestat.errorfloatnullablen_logeps[s] s for synthmeta.notecharo_logeps? Number of lines used for the logeps4 determinationmeta.numberintnullable[X/H]4? HD 30443 [X/H] abundancephys.abundfloatnullable[X/Fe]4? HD 30443 [X/Fe] abundancephys.abundfloatnullablelogeps5? CD-38 2151 log{epsilon} abundancephys.abundfloatnullablee_logeps5? CD-38 2151 log{epsilon} abundancestat.errorfloatnullablen_logeps5[s] s for synthmeta.notecharo_logeps5? Number of lines used for the logeps5 determinationmeta.numberintnullable[X/H]5? CD-38 2151 [X/H] abundancephys.abundfloatnullable[X/Fe]5? CD-38 2151 [X/Fe] abundancephys.abundfloatnullablelogeps6? HD 50264 log{epsilon} abundancephys.abundfloatnullablee_logeps6? HD 50264 log{epsilon} abundancestat.errorfloatnullablen_logeps6[s] s for synthmeta.notecharo_logeps6? Number of lines used for the logeps6 determinationmeta.numberintnullableJ/MNRAS/486/3266/tablea3Elemental abundances in HD 87080, HD 87853, and HD 123701[X/Fe]7? HD 87080 [X/Fe] abundancephys.abundfloatnullablelogeps8? HD 87853 log{epsilon} abundancephys.abundfloatnullablee_logeps8? HD 87853 log{epsilon} abundancestat.errorfloatnullablen_logeps8[s] s for synthmeta.notecharo_logeps8? Number of lines used for the logeps8 determinationmeta.numberintnullable[X/H]8? HD 87853 [X/H] abundancephys.abundfloatnullable[X/Fe]8? HD 87853 [X/Fe] abundancephys.abundfloatnullablelogeps9? HD 123701 log{epsilon} abundancephys.abundfloatnullablee_logeps9? HD 123701 log{epsilon} abundancestat.errorfloatnullablen_logeps9[s] s for synthmeta.notecharo_logeps9? Number of lines used for the logeps9 determinationmeta.numberintnullable[X/H]9? HD 123701 [X/H] abundancephys.abundfloatnullable[X/Fe]9? HD 123701 [X/Fe] abundancephys.abundfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIonphys.atmol.ionStagecharZIon numberphys.atmol.numberintlogepsSSolar abundance (G1)phys.abundfloatlogeps7? HD 87080 log{epsilon} abundancephys.abundfloatnullablee_logeps7? HD 87080 log{epsilon} abundancestat.errorfloatnullablen_logeps7[s] s for synthmeta.notecharo_logeps7? Number of lines used for the logeps7 determinationmeta.numberintnullable[X/H]7? HD 87080 [X/H] abundancephys.abundfloatnullableJ/MNRAS/486/3266/tablea4Elemental abundances in HD 176021, HD 188985, and HD 202020[X/Fe]10? HD 176021 [X/Fe] abundancephys.abundfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIonphys.atmol.ionStagecharZIon numberphys.atmol.numberintlogepsSSolar abundance (G1)phys.abundfloatlogeps10? HD 176021 log{epsilon} abundancephys.abundfloatnullablee_logeps10? HD 176021 log{epsilon} abundancestat.errorfloatnullablen_logeps10[s] s for synthmeta.notecharo_logeps10? Number of lines used for the logeps10 determinationmeta.numberintnullable[X/H]10? HD 176021 [X/H] abundancephys.abundfloatnullablelogeps11? HD 188985 log{epsilon} abundancephys.abundfloatnullablee_logeps11? HD 188985 log{epsilon} abundancestat.errorfloatnullablen_logeps11[s] s for synthmeta.notecharo_logeps11? Number of lines used for the logeps11 determinationmeta.numberintnullable[X/H]11? HD 188985 [X/H] abundancephys.abundfloatnullable[X/Fe]11? HD 188985 [X/Fe] abundancephys.abundfloatnullablelogeps12? HD 202020 log{epsilon} abundancephys.abundfloatnullablee_logeps12? HD 202020 log{epsilon} abundancestat.errorfloatnullablen_logeps12[s] s for synthmeta.notecharo_logeps12? Number of lines used for the logeps12 determinationmeta.numberintnullable[X/H]12? HD 202020 [X/H] abundancephys.abundfloatnullable[X/Fe]12? HD 202020 [X/Fe] abundancephys.abundfloatnullable