J/MNRAS/493/4677ivo://CDS.VizieR/J/MNRAS/493/4677doi:10.26093/cds/vizier/bg-fd-4j5CDSCaffau E.Bonifacio P.Sbordone L.Matas Pinto A.M.Francois P.,Jablonka P.Lardo C.Martin N.F.Starkenburg E.Aguado D.,Gonzalez-Hernandez J.I.Venn K.Mashonkina L.Sestito F.2026-08-03T07:29:43Z2023-07-24T09:22:51ZCDS support team

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

cds-question@unistra.frpopulation-ii-starschemically-peculiar-starsmilky-way-galaxyeffective-temperatureradial-velocitystellar-distancevisible-astronomyExtremely metal-poor (EMP) stars are old objects that mostly formed very early after the big bang. They are rare and, to select them, we have to rely on low-resolution spectroscopic or photometric surveys; specifically the combination of narrow- and broad-band photometry provides a powerful and time efficient way to select MP stars. The Pristine photometric survey is using the Canada-France-Hawaii Telescope MegaCam wide-field imager to obtain narrow-band photometry by utilizing a filter centred at 395.2nm on the Ca II-H and -K lines. Gaia DR2 is providing us the wide-band photometry as well as parallaxes. Follow-up observations of MP candidates allowed us to improve our photometric calibrations. In this paper of the series we analyse MP stars observed with FORS2 at VLT. We demonstrate the Pristine calibration adopted in this work to be able to provide metallicities accurate to +/-0.3dex for MP giant stars with good parallaxes, while it performs poorly for dwarf and turn-off stars, whatever the accuracy on the parallaxes. We find some MP and very MP stars that are not enhanced in {alpha} elements. Such stars have already been found in several other searches, and a higher resolution follow-up of our sample would be useful to put our findings on a firmer ground. This sample of stars analysed has a low fraction of carbon-enhanced MP stars, regardless of the definition adopted. This deficiency could indicate a small sensitivity of the Pristine filter to carbon abundance, issue to be addressed in the future.2020MNRAS.493.4677Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/493/4677CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/493/4677https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/493/4677http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/493/4677https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/493/4677https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/493/4677http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/493/4677GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/493/4677/table3 (Stellar parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/493/4677/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/493/4677/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/493/4677/table3?GETtext/xml+votable180.050000true130.40187517.39758330.0055555555555555566/4338 4350 4366 4381 4419 4483 4679 8204 8207 8246 8252 8266 8296 8301 8306 8314 8323 8328 8338 8351 8356-8357 8375 8389 8392 8412 8417 8456 8459 8466 8474 8483 8495 8513 8518 8521 8525 8713-8715 8742 8754 26041 26046 26270 26284 26294 26296 26334 26349 26361 26427 26446-26447 26456 26461 26467 26470 26479 26513 26537 26563 26577 27580 27655 27660 27702 27715 27717 27724 27730 27732 27753 27767 27910 27927 31421 31443 31445 31448 31454 31456 31462 31481 31484 31513 31518 31529 31533 31536 31546 31554 31583 31587 31589 31594 31603-31604 31607 31614 31617 31620 31625-31627 31635 31639 31664 31667 31670-31671 31673 31680 31702 31708 31717 31731 31735 31740 32387 32391 32394 32416https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/493/4677?format=asciiOpticaldefaultJ/MNRAS/493/4677/table3Stellar parametersSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMoreLink to abundance and orbital datameta.ref.urlcharNameStar name (Pristine_DDD.dddd+DD.dddd)meta.id;meta.maincharprimaryf_Name[a] Flag on Name (1)meta.codecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggError on logglog(cm.s**-2)stat.errorfloatvtMicroturbulence velocitykm/sphys.veloc.microTurbfloat[Fe/H]ph? Photometric Fe/H abundance ratiophys.abund.Fe;arith.ratiofloatnullable[Fe/H]? Fe/H abundance ratiophys.abund.Fe;arith.ratiofloatnullablee_[Fe/H]? Error on [Fe/H]stat.error;phys.abund.Fefloatnullable[Ca/H]? Lain cols 85-88phys.abundfloatnullablee_[Ca/H]? Lain cols 96-99stat.error;phys.abundfloatnullableRV? Radial velocitykm/sphys.veloc;pos.heliocentricintnullablee_RV? Statistical error on the radial velocity (2)km/sstat.errorintnullabledRV? Maximum radial velocity shift for the zenith angle at which the star was observedkm/ssrc.var.amplitudeintnullableJ/MNRAS/493/4677/abundDetailed chemical composition of 98 starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (Pristine_DDD.dddd+DD.dddd)meta.id;meta.maincharTeffEffective temperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloatvtMicroturbulence velocitykm/sphys.veloc.microTurbfloat[M/H]? Photometric metallicityphys.abund.Zfloatnullable[Fe/H]Spectroscopic Fe/H abundance ratiophys.abund.Fe;arith.ratiofloatA(Fe)Iron abundancephys.abundfloats(Fe)Line-to-line scatter on the Fe abundancestat.errorfloato_A(Fe)Number of FeI linesmeta.numberintl_A(C)Limit flag on A (C)meta.code.errorcharA(C)Carbon abundancephys.abundfloatu_A(C)Uncertainty flag on A (C)meta.code.errorcharl_A(N)Limit flag on A (N)meta.code.errorcharA(N)? Nitrogen abundancephys.abundfloatnullableu_A(N)Uncertainty flag on A (N)meta.code.errorcharA(CaK)? Calcium abundance from the CaII-K linephys.abundfloatnullableA(Fe2)? Iron abundance from one FeII linephys.abundfloatnullableA(Mg)Magnesium abundancephys.abundfloats(Mg)? Line-to-line scatter on the Mg abundancestat.errorfloatnullableo_A(Mg)Number of Mg linesmeta.numberintA(Ca1)? Calcium abundance from CaI linesphys.abundfloatnullables(Ca1)? Line-to-line scatter on the Ca abundance from CaI linesstat.errorfloatnullableo_A(Ca1)? Number of CaI linesmeta.numberintnullableA(Ti1)? Titanium abundance from one TiI linephys.abundfloatnullables(Ti1)? Line-to-line scatter on the Ti abundance from TiI linesstat.errorfloatnullableo_A(Ti1)? Number of TiI linesmeta.numberintnullableA(Ti2)? Titanium abundance from one TiII linephys.abundfloatnullables(Ti2)? Line-to-line scatter on the Ti abundance from TiII linesstat.errorfloatnullableo_A(Ti2)? Number of TiII linesmeta.numberintnullableA(Cr)? Chromium abundancephys.abundfloatnullableA(Mn)? Manganese abundancephys.abundfloatnullables(Mn)? Line-to-line scatter on the Mn abundancestat.errorfloatnullableo_A(Mn)? Number of Mn linesmeta.numberintnullableA(Ni)? Nickel abundancephys.abundfloatnullableA(Sr)? Strontium abundancephys.abundfloatnullableA(Ba)? Barium abundancephys.abundfloatnullableA(Na)? Sodium abundancephys.abundfloatnullables(Na)? Line-to-line scatter on the Na abundancestat.errorfloatnullableJ/MNRAS/493/4677/orbitOrbital parameters of 55 stars with [Fe/H]=< -2.5eEccentricitysrc.orbital.eccentricityfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (Pristine_DDD.dddd+DD.dddd)meta.id;meta.maincharDistHeliocentric distancekpcpos.distancefloate_DistError on Distkpcstat.errorfloatrapoApocentre distancekpcpos.distance;src.orbitalfloatE_rapoUpper error on rapokpcstat.error;stat.maxfloate_rapoLower error on rapokpcstat.errorfloatrperiPericentre distancekpcpos.distance;src.orbitalfloatE_rperiUpper error on rperikpcstat.error;stat.maxfloate_rperiLower error on rperikpcstat.errorfloatE_eUpper error on estat.error;stat.maxfloate_eLower error on estat.errorfloatJphiAzimuthal component of the actionkpc.km/sarith.grad;phys.velocfloatE_JphiUpper error on Jphikpc.km/sstat.error;stat.maxfloate_JphiLower error on Jphikpc.km/sstat.errorfloatJzVertical component of the actionkpc.km/sarith.grad;phys.velocfloatE_JzUpper error on Jzkpc.km/sstat.error;stat.maxfloate_JzLower error on Jzkpc.km/sstat.errorfloatZmaxMaximum excursion from the Milky Way planekpcpos.cartesian.z;pos.galacticfloatE_ZmaxUpper error on Zmaxkpcstat.error;stat.maxfloate_ZmaxLower error on Zmaxkpcstat.errorfloat