J/A+A/687/A177ivo://CDS.VizieR/J/A+A/687/A177doi:10.26093/cds/vizier.36870177CDSXylakis-Dornbusch T.Christlieb N.Hansen T.T.Nordlander T.,Webber K.B.Marshall J.2024-11-21T20:02:02Z2024-07-11T09:24:17ZCDS support team

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

cds-question@unistra.frpopulation-ii-starschemically-peculiar-starssurveysmetallicityThe third Gaia Data Release, which includes BP/RP spectra for 219 million sources, has opened a new window in the exploration of the chemical history and evolution of the Milky Way. The wealth of information encapsulated in these data is far greater than their low resolving power (R ~ 50) at first glance would suggest, as shown in many studies. We zero in on the use of this data for the purpose of the detection of "new" metal-poor stars, which are hard to find yet essential for understanding - among other - several aspects of the origin of the Galaxy, star formation and the creation of the elements. We strive to refine a metal-poor candidate selection method which was developed with simulated Gaia BP/RP spectra, with an ultimate objective of providing the community with both a recipe to select stars for medium/high resolution observations and a catalogue of stellar metallicities. We used a dataset comprised of GALAH DR3 and SAGA database stars in order to verify and adjust to real world data our selection method. For that purpose, we used dereddening as a mean to tackle the issue of extinction, and then we applied our fine-tuned method to select metal-poor candidates, which we thereafter observed and analysed. We were able to infer metallicities for GALAH DR3 and SAGA stars - with color excesses up to E(B-V)<1.5 - with an uncertainty of {sigma}_[Fe/H]inf_~0.36, which is good enough for the purpose of identifying new metal-poor stars. Further, we selected 26 metal-poor candidates - via our method - for observations. As spectral analysis showed, 100% of them had [Fe/H]<-2.0, 57% had [Fe/H]<-2.5 and 8% had [Fe/H]<-3.0. We inferred metallicities for these stars with an uncertainty {sigma}_[Fe/H]inf_~0.31, as was proven when comparing to the spectroscopic [Fe/H]. Finally, we assembled a catalogue of metallicities for 10861062 stars.2024A&A...687A.177Xhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/687/A177CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)J/MNRAS/506/150 : The GALAH+ Survey DR3 (Buder+, 2021)J/A+A/666/A58 : Metal-poor stars identification methodhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/687/A177https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/687/A177http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/687/A177https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/687/A177https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/687/A177http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/687/A177GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/687/A177/catalog (Inferred [Fe/H], Gaia DR3 identifier, positions, and magnitudes for 10861062 stars (table 3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/687/A177/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/687/A177/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/687/A177/catalog?GETtext/xml+votable180.050000true50.26939812073835.02690364954380.0055555555555555561/16-18 24-26 33-35 45 2/0 16 32 76 82 88 90 108 122-123 129-131 171 173-175 177-179 185 188-189 191 3/4 8 68 72 132 136 192-193 196 308 312 320 322 358 364 366 436 440 482-483 486 504 515 584 586 605 607-608 610 616 629 631 637 639 683 690-691 707 737 739 749 760-761 763 4/20 24 36 40 276 280 292 532 536 548 552 780-781 788 792 1236 1240 1252 1256 1286 1292 1294 1336 1338 1364-1365 1367 1373 1375 1424 1426-1427 1438 1460 1462 1468 1470-1471 1748 1752 1764 1768 1872-1873 1876-1877 1879 1920 1922-1923 1926-1927 1938 1948 1950-1951 1994-1995 2020 2024 2053-2055 2057-2059 2313-2315 2391 2397-2399 2419 2425 2427 2472 2474-2475 2513 2515 2521 2523 2545 2547 2565 2715 2717-2719 2727 2731 2754-2755 2758-2759 2821-2823 2825-2827 2945 2947 2981 2992-2993 2995 3005 3048-3049 5/84-86 88-90 100-102 104-106 148-150 152-154 164-166 168-170 1108-1110 1112-1114 1124-1126 1128-1130 1172-1174 1176-1178 1184-1185 1187-1190 1193 2132-2134 2136-2138 2148-2150 2152-2154 2196-2198 2200-2202 2212-2214 2216-2218 3104-3105 3108-3109 3111 3156-3158 3160-3162 3172-3174 3177 4948-4950 4952-4954 4964-4966 4968-4970 5012-5014 5016-5018 5028-5030 5032-5034 5136 5138 5174 5180 5182-5183 5314 5320 5322 5356 5358 5464-5465 5467 5489 5491 5589 5591 5597 5700 5702-5703 5722 5744 5746 5852 5854 5876 5878 6996-6998 7000-7002 7012-7014 7016-7018 7060-7062 7064-7066 7076-7078 7080-7082 7441 7444-7445 7500-7501 7512-7513 7515 7686-7687 7698-7699 7758-7759 7770 7796 7798-7799 7970-7971 7994-7995 7998 8084-8086 8088-8090 8100-8102 8104-8106 8207 8211 8227 9231 9251 9559 9585 9587 9669 9671 9707 9892 9894-9895 10049 10051 10057 10059 10081 10083 10089 10212-10213 10215 10221 10223 10259 10304-10305 10308-10309 10320 10846-10847 10855 10858-10859 10865-10867 10901-10903 10905-10907 10917-10919 10921-10923 11015 11026-11027 11029-11031 11279 11283 11299 11776-11777 11779 11785 11812-11813 11815 11821 11920-11921 11923 11933 11976-11977 11979 12016-12017 12201 12204-12205 12207 6/348 364 368 412 428 432 448 604 620 624 668 684 688 704 768 2048 4444 4460 4464 4508 4524 4528 4544 4700 4716 4720 4744-4745 4747 4764 4769 4780 4784 4800 4864 5120 8540 8556 8560 8604 8620 8624 8640 8796 8812 8816 8860 8876 8880 8896 8960 9216 10240 12429 12440-12441 12517 12528-12529 12532-12533 12636 12652 12656 12700 12704-12705 12707 12720 12736 13312 19804 19820 19824 19868 19884 19888 19904 20060 20076 20080 20124 20140 20144 20160 20224 20556 20558 20602 20688 20690-20691 20702 20724 20726 21248 21250 21286 21292 21294-21295 21400 21402 21438 21780-21781 21783 21789 21791 21864-21865 21867 21953 21989 21991 21997 22352-22353 22355 22361 22397 22399 22804 22806-22807 22880 22882 22982 22988 22990 23034 23376 23378 23384 23386-23387 23422 23508 23510 23516 23518 27996 28012 28016 28060 28076 28080 28096 28252 28268 28272 28316 28332 28336 28352 28416 29760-29761 29784-29785 29788-29789 29791 29985 29988-29989 30013 30056-30057 30059 30160-30161 30164-30165 30167 30738-30739 30742-30743 30786 30808 30810-30811 30814-30815 30986 31026-31027 31030 31086-31087 31188 31190-31191 31874-31875 31898-31899 31968 31970-31971 31974 31998-31999 32348 32364 32368 32412 32428 32432 32448 32512 32823 32827 32839 32843 32903 32907 36919 36923 36962 36968 36970 36999 37003 37056 37058 37064 37066 37088 37090 37096 37098 37440 37442 37448 37450 37472 37474 37480 37482 37568 37570 37576 37578 37600 37602 37608 37610 38229-38231 38233 38235 38247 38253-38255 38327 38333-38335 38339 38345-38347 38675 38681 38683 38789 38791 38797 38799 38821-38823 38976 38978 38984 38986 39008 39010 39016 39018 39104 39106 39112 39114 39136 39138 39144 39572 39574-39575 39648 39650 39656 39658-39659 40364-40365 40367 40709 40711 40717 40719 40741 40857 40859 40881 41031 41035 41057 41060-41061 41224-41226 41228-41229 41240-41241 41284-41286 41296-41297 41300-41301 43263 43375 43382-43383 43415 43418-43419 43427 43429-43431 43457-43459 43581-43583 43597-43599 43602-43603 43617-43619 43663 43665-43667 43683 44047 44058-44059 44099 44102-44103 44113-44115 45111 45115 45127 45131 45191 45195 47113 47115 47137 47148-47149 47151 47237 47256-47257 47259 47281 47293 47295 47689 47717 47728-47729 47731 47912-47913 48017 48020-48021 48023 48076-48077 48116-48117 48800-48801 48803 48813 48824-48825 488271.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/687/A177?format=asciidefaultJ/A+A/687/A177/catalogInferred [Fe/H], Gaia DR3 identifier, positions, and magnitudes for 10861062 stars (table 3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[0/10861061] Sequential numbermeta.recordintGaiaDR3Gaia DR3 source idmeta.id;meta.mainRA_ICRSRight ascension (ICRS) at Ep=2016.0degpos.eq.ra;meta.mainindexedDE_ICRSDeclination (ICRS) at Ep=2016.0degpos.eq.dec;meta.mainindexedE(B-V)Color excess (1)magphot.color.excessdoublefrCaHK/HbFlux-ratio CaHK/H{beta}phot.flux;arith.ratiodoublefrG/CaNIRFlux-ratio C/CaNIRphot.flux;arith.ratiodouble[Fe/H]infInferred [Fe/H]phys.abund.FefloatGmagG Gaia magnitudemagphot.mag;em.optdoubleBPmagBP Gaia magnitudemagphot.mag;em.opt.BdoubleRPmagRP Gaia magnitudemagphot.mag;em.opt.Rdouble