J/MNRAS/472/2963ivo://CDS.VizieR/J/MNRAS/472/2963doi:10.26093/cds/vizier.74722963CDSYouakim K.Starkenburg E.Aguado D.S.Martin N.F.Fouesneau M.,Gonzalez Hernandez J.I.Allende Prieto C.Bonifacio P.Gentile M.,Kielty C.Cote P.Jablonka P.McConnachie A.Sanchez Janssen R.,Tolstoy E.Venn K.2024-08-17T20:20:53Z2020-08-11T10:12:20ZCDS support team

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

cds-question@unistra.frchemically-peculiar-starsmetallicityvisible-astronomysloan-photometryThe Pristine survey is a narrow-band, photometric survey focused around the wavelength region of the CaII H&K absorption lines, designed to efficiently search for extremely metal-poor stars. In this work, we use the first results of a medium-resolution spectroscopic follow-up to refine the selection criteria for finding extremely metal-poor stars ([Fe/H]<=-3.0) in the Pristine survey. We consider methods by which stars can be selected from available broad-band and infrared photometry plus the additional Pristine narrow-band photometry. The sample consists of 205 stars in the magnitude range 14<V<18. Applying the photometric selection criteria cuts the sample down to 149 stars, and from these we report a success rate of 70 per cent for finding stars with [Fe/H]<=-2.5 and 22 per cent for finding stars with [Fe/H]<=-3.0. These statistics compare favourably with other surveys that search for extremely metal-poor stars, namely an improvement by a factor of ~4-5 for recovering stars with [Fe/H]<=-3.0. In addition, Pristine covers a fainter magnitude range than its predecessors and can thus probe deeper into the Galactic halo.2017MNRAS.472.2963Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/472/2963CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AN/338/686 : Pristine survey II. Bright stars abundances (Caffau+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/472/2963https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/472/2963http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/472/2963https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/472/2963https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/472/2963http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/472/2963GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/472/2963/Sample (Metallicities of Pristine stars from photometry and spectroscopy (table 1) and SDSS coordinates and magnitudes used in the paper (table 1s))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/472/2963/Sample?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/472/2963/Sample?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/472/2963/Sample?GETtext/xml+votable180.050000true183.542416713.6790.0055555555555555565/8096 6/8245-8246 8257 8259-8260 8262 8269 8276-8277 8281 8297 8308 8313 8329 8332-8333 8335 8366 8398 8405 8412 8418 8424 8432-8433 8449 8454-8455 8459 8467 8471-8472 8476 8480 8486 8497-8498 8513 8708 8718 8724 8726 8731 8733-8734 8770 26095 26399 26420 26424 26460 26484 26495 26552 26554 26593 26604-26605 27679 27714-27715 27762 27847 27852 27857 27889 27915 27917 27947 27968 27970 28032 31397-31398 31406 31411 31417 31469-31470 31474-31475 31478 31481 31483 31534-31535 31538-31539 31542-31544 31551 31567 31581 31585 31587-31588 31590-31592 31594 31598-31599 31606-31607 31609 31611 31620-31622 31627-31628 31630 31635-31636 31640-31641 31643-31644 31648-31649 31651-31653 31655 31657-31659 31671-31672 31676-31677 31685 31688 31693 31697 31699 31701 31705 31707 31710 31715 31718 31720 31724-31725 31730 32264 32266-32267 32292 32298-32300 32388 323922.381800341673347e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/472/2963?format=asciiOpticaldefaultJ/MNRAS/472/2963/SampleMetallicities of Pristine stars from photometry and spectroscopy (table 1) and SDSS coordinates and magnitudes used in the paper (table 1s)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPristinePristine designation (DDD.dddd+DD.dddd)meta.id;meta.maincharCaHKMagnitude obtained from the Pristine narrow-band filtermagphot.magfloate_CaHKrms uncertainty on CaHKmagstat.errorfloat[Fe/H]g-i? Photometric metallicity determined using the g-i colourphys.abund.FefloatnullableP[Fe/H]g-i? Probability that [Fe/H]_g-i<=-2.5stat.probabilityfloatnullable[Fe/H]g-r? Photometric metallicity determined using the g-r colourphys.abund.FefloatnullableP[Fe/H]g-r? Probability that [Fe/H]_g-r<=-2.5stat.probabilityfloatnullablel_[Fe/H][>= ] Limit flag on [Fe/H]meta.code.error;phys.abund.Fechar[Fe/H]Spectroscopic metallicity derived form FERREphys.abund.Zfloate_[Fe/H]? rms uncertainty on [Fe/H]stat.error;phys.abund.FefloatnullableS/NSignal to noise ratio of the analyzed spectrumstat.snrintInstInstrument used for the observations, either INT/IDS or WHT/ISISinstr.setupcharFlagsSelection criteria a given star failed to meet (1)meta.code.errorcharRAJ2000SDSS right ascension (J2000)pos.eq.ra;meta.mainDEJ2000SDSS declination (J2000)pos.eq.dec;meta.maingmagSDSS g magnitudemagphot.mag;em.opt.Bfloate_gmagSDSS g magnitude errormagstat.error;phot.magfloatrmagSDSS r magnitudemagphot.mag;em.opt.Rfloate_rmagSDSS r magnitude errormagstat.error;phot.magfloatimagSDSS i magnitudemagphot.mag;em.opt.Ifloate_imagSDSS i magnitude errormagstat.error;phot.magfloatVmagV magnitude (1)magphot.mag;em.opt.VfloatSimbadSimbad column added by the CDSmeta.ref.urlchar