J/MNRAS/491/874ivo://CDS.VizieR/J/MNRAS/491/874doi:10.26093/cds/vizier.74910874CDSNaslim N.Jeffery C.S.Woolf V.M.2024-08-20T20:15:14Z2023-04-03T16:17:32ZCDS support team

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

cds-question@unistra.frsubdwarf-starschemically-peculiar-starsvisible-astronomyspectroscopyeffective-temperatureradial-velocityThe discovery of extremely zirconium- and lead-rich surfaces amongst a small subgroup of hot subdwarfs has provoked questions pertaining to chemical peculiarity in hot star atmospheres and about their evolutionary origin. With only three known in 2014, a limited search for additional 'heavy-metal' subdwarfs was initiated with the Subaru Telescope. Five hot subdwarfs having intermediate to high surface enrichment of helium were observed at high resolution and analysed for surface properties and abundances. This paper reports the analyses of four of these stars. PG 1559+048 and FBS 1749+373, having only intermediate helium enrichment, show strong lines of triply ionized lead. PG 1559+048 also shows a strong overabundance of germanium and yttrium. With more helium-rich surfaces, Ton 414 and J17554+5012, do not show evidence of heavy-metal enrichment. This limited survey suggests that extreme enrichment of 'heavy metals' by selective radiative levitation in hot subdwarf atmospheres is suppressed if the star is too helium rich.2020MNRAS.491..874Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/491/874CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/491/874https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/491/874http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/491/874https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/491/874https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/491/874http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/491/874GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/491/874/table1 (Atmospheric parameters for the programme stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/491/874/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/491/874/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/491/874/table1?GETtext/xml+votable180.050000true240.38030254.67418530.0055555555555555566/4976 9695 31444 32749https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/491/874?format=asciiOpticaldefaultJ/MNRAS/491/874/table1Atmospheric parameters for the programme starsSimbadNameSimbad column added by the CDSmeta.idcharnullableNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGrid[m10/sbd] Model atmosphere grid (1)meta.id;stat.fitcharTeffEffective temperatureKphys.temperature.effectiveinte_Teff? Error on TeffKstat.error;phys.temperature.effectiveintnullableloggSurface gravitylog(cm.s**-2)phys.gravityfloate_logg? Error on logglog(cm.s**-2)stat.errorfloatnullablenHe? Fractional helium abundancephys.density;arith.ratiofloatnullablee_nHe? Error on nHestat.errorfloatnullablelogy? Logarithm of helium-to-hydrogen ratiophys.abund.Yfloatnullablee_logy? Error on logystat.error;pos.cartesian.yfloatnullablevsiniProjected equatorial rotation velocity (2)km/sphys.veloc.rotatinte_vsiniError on vsinikm/sstat.error;phys.veloc.rotatfloatRVRadial velocity (3)km/sphys.veloc;pos.heliocentricfloate_RVError on RVkm/sstat.errorfloatrefReference for Teff, logg, logy and nHe (4)meta.ref;pos.frameint_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/491/874/table2Elemental abundances in the form log{epsilon}_i_recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharf_NameFlag on Name (1)meta.codecharloge(H)Hydrogen abundance (G1)phys.abundfloatloge(He)Helium abundance (G1)phys.abundfloatloge(C)Carbon abundance (G1)phys.abundfloate_loge(C)? Error on loge(C)stat.errorfloatnullableloge(N)Nitrogen abundance (G1)phys.abundfloate_loge(N)? Error on loge(N)stat.errorfloatnullablel_loge(O)Limit flag on loge(O)meta.code.errorcharloge(O)Oxygen abundance (G1)phys.abundfloate_loge(O)? Error on loge(O)stat.errorfloatnullablel_loge(Ne)Limit flag on loge(Ne)meta.code.errorcharloge(Ne)Neon abundance (G1)phys.abundfloate_loge(Ne)? Error on loge(Ne)stat.errorfloatnullablel_loge(Mg)Limit flag on loge(Mg)meta.code.errorcharloge(Mg)Magnesium abundance (G1)phys.abundfloatl_loge(Al)Limit flag on loge(Al)meta.code.errorcharloge(Al)Aluminium abundance (G1)phys.abundfloate_loge(Al)? Error on loge(Al)stat.errorfloatnullableloge(Si)Silicon abundance (G1)phys.abundfloate_loge(Si)? Error on loge(Si)stat.errorfloatnullableloge(S)Sulfur abundance (G1)phys.abundfloate_loge(S)? Error on loge(S)stat.errorfloatnullablel_loge(Cl)Limit flag on loge(Cl)meta.code.errorcharloge(Cl)Chlorine abundance (G1)phys.abundfloate_loge(Cl)? Error on loge(Cl)stat.errorfloatnullableloge(Ar)Argon abundance (G1)phys.abundfloatl_loge(Ca)Limit flag on loge(Ca)meta.code.errorcharloge(Ca)Calcium abundance (G1)phys.abundfloate_loge(Ca)? Error on loge(Ca)stat.errorfloatnullablel_loge(Ti)Limit flag on loge(Ti)meta.code.errorcharloge(Ti)Titanium abundance (G1)phys.abundfloate_loge(Ti)? Error on loge(Ti)stat.errorfloatnullablel_loge(V)Limit flag on loge(V)meta.code.errorcharloge(V)Vanadium abundance (G1)phys.abundfloate_loge(V)? Error on loge(V)stat.errorfloatnullablel_loge(Fe)Limit flag on loge(Fe)meta.code.errorcharloge(Fe)Iron abundance (G1)phys.abundfloatl_loge(Ge)Limit flag on loge(Ge)meta.code.errorcharloge(Ge)Germanium abundance (G1)phys.abundfloate_loge(Ge)? Error on loge(Ge)stat.errorfloatnullablel_loge(Y)Limit flag on loge(Y)meta.code.errorcharloge(Y)Yttrium abundance (G1)phys.abundfloate_loge(Y)? Error on loge(Y)stat.errorfloatnullablel_loge(Zr)Limit flag on loge(Zr)meta.code.errorcharloge(Zr)Zirconium abundance (G1)phys.abundfloatl_loge(Pb)Limit flag on loge(Pb)meta.code.errorcharloge(Pb)Lead abundance (G1)phys.abundfloate_loge(Pb)? Error on loge(Pb)stat.errorfloatnullablel_loge(Ar)Limit flag on loge(Ar)meta.code.errorcharJ/MNRAS/491/874/tablea2Comparison of abundances log{epsilon}_i_ for microturbulent velocities v_t_= 0.0 and 5.0km/sf_Name[ab] Flag on Name (1)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar Namemeta.id;meta.maincharloge(C)Carbon abundance (G1)phys.abundfloate_loge(C)Error on loge(C)stat.errorfloatloge(N)Nitrogen abundance (G1)phys.abundfloate_loge(N)Error on loge(N)stat.errorfloatloge(O)? Oxygen abundance (G1)phys.abundfloatnullablee_loge(O)? Error on loge(O)stat.errorfloatnullableloge(Ne)? Neon abundance (G1)phys.abundfloatnullablee_loge(Ne)? Error on loge(Ne)stat.errorfloatnullableloge(Al)? Aluminium abundance (G1)phys.abundfloatnullablee_loge(Al)? Error on loge(Al)stat.errorfloatnullableloge(Si)Silicon abundance (G1)phys.abundfloate_loge(Si)Error on loge(Si)stat.errorfloatloge(S)Sulfur abundance (G1)phys.abundfloate_loge(S)Error on loge(S)stat.errorfloatloge(Cl)? Chlorine abundance (G1)phys.abundfloatnullablee_loge(Cl)? Error on loge(Cl)stat.errorfloatnullableloge(Ca)? Calcium abundance (G1)phys.abundfloatnullablee_loge(Ca)? Error on loge(Ca)stat.errorfloatnullableloge(Ti)? Titanium abundance (G1)phys.abundfloatnullablee_loge(Ti)? Error on loge(Ti)4stat.errorfloatnullableloge(V)? Vanadium abundance (G1)phys.abundfloatnullablee_loge(V)? Error on loge(V)stat.errorfloatnullableloge(Ge)? Germanium abundance (G1)phys.abundfloatnullablee_loge(Ge)? Error on loge(Ge)stat.errorfloatnullableloge(Y)? Yttrium abundance (G1)phys.abundfloatnullablee_loge(Y)? Error on loge(Y)stat.errorfloatnullableloge(Pb)? Lead abundance (G1)phys.abundfloatnullablee_loge(Pb)? Error on loge(Pb)stat.errorfloatnullable