J/ApJ/931/147ivo://CDS.VizieR/J/ApJ/931/147doi:10.26093/cds/vizier.19310147CDSLi H.Aoki W.Matsuno T.Xing Q.Suda T.Tominaga N.Chen Y.,Honda S.Ishigaki M.N.Shi J.Zhao J.Zhao G.2025-06-19T20:10:39Z2024-05-15T08:58:54ZCDS support team

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

cds-question@unistra.frchemically-peculiar-starsvisible-astronomyspectroscopychemical-abundancesWe present homogeneous abundance analysis of over 20 elements for 385 very metal-poor (VMP) stars based on the LAMOST survey and follow-up observations with the Subaru Telescope. It is the largest high-resolution VMP sample (including 363 new objects) studied by a single program, and the first attempt to accurately determine evolutionary stages for such a large sample based on Gaia parallaxes. The sample covers a wide metallicity range from [Fe/H]<~-1.7 down to [Fe/H]~-4.3, including over 110 objects with [Fe/H]<~-3.0. The expanded coverage in evolutionary status makes it possible to define the abundance trends respectively for giants and turnoff stars. The newly obtained abundance data confirm most abundance trends found by previous studies, but also provide useful updates and new samples of outliers. The Li plateau is seen in main-sequence turnoff stars with -2.5<[Fe/H]{<}-1.7 in our sample, whereas the average Li abundance is clearly lower at lower metallicity. Mg, Si, and Ca are overabundant with respect to Fe, showing decreasing trend with increasing metallicity. Comparisons with chemical evolution models indicate that the overabundance of Ti, Sc, and Co are not well reproduced by current theoretical predictions. Correlations are seen between Sc and {alpha}-elements, while Zn shows a detectable correlation only with Ti but not with other {alpha}-elements. The fraction of carbon-enhanced stars ([C/Fe]>0.7) is in the range of 20%-30% for turnoff stars depending on the treatment of objects for which C abundance is not determined, which is much higher than that in giants (~8%). Twelve Mg-poor stars ([Mg/Fe]<0.0) have been identified in a wide metallicity range from [Fe/H]~-3.8 through -1.7. Twelve Eu-rich stars ([Eu/Fe]>1.0) have been discovered in -3.4<[Fe/H]{<}-2.0, enlarging the sample of r-process-enhanced stars with relatively high metallicity.2022ApJ...931..147Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/931/147CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/subaru : Log of Subaru Prime Focus Camera Exposures (ADAC NAOJ, 2007)V/164 : LAMOST DR5 catalogs (Luo+, 2019)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/AJ/90/2089 : Stars of very low metal abundance. I (Beers+, 1985)J/AJ/103/1987 : Stars of very low metal abundance (Beers+ 1992)J/A+AS/117/227 : Dwarf effective temperatures (Alonso+ 1996)J/A+A/354/169 : Metal-poor field stars abundances (Gratton+, 2000)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/ApJ/617/1091 : La and Eu abundances in 85 stars (Simmerer+, 2004)J/A+A/439/129 : HERES II. Spectroscopic analysis (Barklem+, 2005)J/A+A/442/961 : Lithium content of the Gal. Halo stars (Charbonnel+, 2005)J/ApJ/655/492 : Equivalent widths of 26 metal-poor stars (Aoki+, 2007)J/ApJ/667/1267 : CrI transition probabilities (Sobeck+, 2007)J/A+A/484/721 : HES survey. IV. Cand. metal-poor stars (Christlieb+, 2008)J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)J/A+A/501/519 : Extremely metal-poor turnoff stars abund. (Bonifacio+, 2009)J/A+A/503/545 : Equivalent widths of Li, Na, Fe, Ca in NGC6397 (Lind+, 2009)J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)J/ApJ/724/341 : Nucleosynthesis of massive metal-free stars (Heger+, 2010)J/MNRAS/403/1413 : Updated stellar yields from AGB models (Karakas, 2010)J/A+A/516/A46 : HE 2327-5642 abundance analysis (Mashonkina+, 2010)J/A+A/511/L10 : Abundances and space velocities of 94 stars (Nissen+, 2010)J/A+A/522/A26 : Fe Abundances in metal-poor stars (Sbordone+ 2010)J/ApJ/742/54 : CASH project II. Extremely metal-poor stars (Hollek+, 2011)J/AJ/141/175 : Abundances in M15 RGB/RHB stars (Sobeck+, 2011)J/MNRAS/412/843 : SAGA extremely metal-poor stars (Suda+, 2011)J/ApJS/199/38 : Presupernova evolution (Limongi+, 2012)J/ApJ/751/102 : Equivalent widths of 9 RGB in Carina dSph (Venn+, 2012)J/AJ/145/13 : Metal-poor stars from SDSS/SEGUE. I. Abund. (Aoki+, 2013)J/ApJ/778/56 : Hamburg/ESO Survey extremely metal-poor stars (Cohen+, 2013)J/ApJ/769/57 : Equivalent widths of metal-poor stars (Frebel+, 2013)J/ApJ/762/25 : The most metal-poor stars in HES & SDSS. I. (Norris+, 2013)J/ApJ/762/26 : Most metal-poor stars. II. Galactic halo stars (Yong+, 2013)J/ApJ/797/44 : Evolution and nucleosynthesis of AGB stars (Fishlock+, 2014)J/ApJ/781/40 : Metal-poor stars from HES survey. II. Sp. (Placco+, 2014)J/ApJ/797/21 : Carbon-enhanced metal-poor stars (Placco+, 2014)J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)J/ApJ/807/171 : SkyMapper Survey metal-poor star sp. (Jacobson+, 2015)J/ApJ/798/110 : Equivalent widths of LAMOST metal-poor stars (Li+, 2015)J/A+A/586/A120 : Grid of 1D models for Mg line formation (Osorio+, 2016)J/AJ/151/82 : The 4 brightest red giants in Ret 2 (Roederer+, 2016)J/ApJ/833/20 : Carbon-enhanced metal-poor (CEMP) star abund. (Yoon+, 2016)J/AJ/154/52 : Metal-poor stars from SDSS/SEGUE. I. (Matsuno+, 2017)J/A+A/608/A46 : Constraining cosmic scatter (Reggiani+, 2017)J/A+A/618/A133 : Non standard s-process in massive stars (Choplin+, 2018)J/ApJ/855/63 : Yields of Fe & Zn for different types of SNe (Hirai+, 2018)J/ApJS/238/16 : LAMOST-DR3 very metal-poor star catalog (Li+, 2018)J/ApJS/237/13 : Models & yields of 13-120M_{sun}_ stars (Limongi+, 2018)J/A+A/618/A134 : Omega Cen lower red giant stars abund. (Mucciarelli+, 2018)J/ApJ/857/2 : Abundances in 6 metal-poor stars (Roederer+, 2018)J/ApJ/865/129 : Abundance analysis of HD 222925 (Roederer+, 2018)J/ApJ/868/110 : R-Process Alliance: 1st release in Gal. halo (Sakari+, 2018)J/ApJ/857/111 : Stellar yields of rot. first stars. II. (Takahashi+, 2018)J/ApJ/883/84 : MIKE obs. of 2 metal-poor stars (Roederer+, 2019)J/ApJ/874/148 : Metal-poor star RAVE J093730.5-062655 abund. (Sakari+, 2019)J/ApJ/872/137 : Abund. of red clump & RGBs with APOGEE (Shetrone+, 2019)J/ApJ/898/150 : High-res. MIKE obs. of metal-poor stars (Ezzeddine+, 2020)J/ApJ/897/183 : Abundances of 3 stars in Grus II galaxy (Hansen+, 2020)J/ApJS/249/30 : R-Process Alliance: metal-poor star sp. (Holmbeck+, 2020)J/ApJ/903/88 : Ions individual abund. in LAMOST J1109+0754 (Mardini+, 2020)J/MNRAS/497/L7 : Gal. disc Pristine low-metallicity stars (Sestito+, 2020)J/MNRAS/492/3241 : The Pristine survey. IX. (Venn+, 2020)J/ApJ/891/39 : LAMOST very metal-poor stars of the Gal. halo (Yuan+, 2020)J/MNRAS/500/889 : S2 stream. Shreds of a primitive dwarf gal. (Aguado+, 2021)J/ApJ/931/146 : Very metal-poor stars with LAMOST & Subaru. I. (Aoki+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/931/147https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/931/147http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/931/147https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/931/147https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/931/147http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/931/147GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/931/147/table2 (Stellar parameters of the program stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/931/147/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/931/147/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/931/147/table2?GETtext/xml+votable180.050000true0.645993893.7270850.0055555555555555566/24 143-144 146 207 337 368 377 428 697 815 1210 1224 1519 1533 1971 2064 2083 2087 2148 2404 2437 2579 2599 2602 2707 2737 2838 4170 4282 4324 4413 4598 4694 4702 4705 4734 4783 4799 4821 4884 4909 4934 4948 4968 4974 5036 5061 5109 5171 5190 5222 5276 5316 5341 5354 5359 5381 5386 5458 5491 5496-5497 5546 5667 5713 5723 5995 6264 6274 6287 6310 6333 6338 6378 6386 6392 6400 6412 6463 6486 6589 6624 6627-6628 6711 6728 6783 6850 6997 7008 7020 7046 7067 7119 7143 7242 7255 7685 8207 8212 8242 8262 8274 8312 8332 8377 8387 8395 8446 8525 8558 8642 8644 8752 8764 8766 8834 8864 8880 8884 8890 8903 8920 9023 9026 9045 9091 9116 9121 9154 9167 9185 9198 9215 9261 9504 9512 9574 9639 9647 9649 9830 9846 9871 10003 10027 10051 10070 10118 10122 10132 10307 10309 10318 10335 10376 10382 10440 10448 10491 10506 10512-10513 10517 10520 10568 10581 10643 10705 10727 10783 10785 10797 10820 10902 10914 10928 10937 11031 11079 11106 11149-11150 11344 11364 11367 11396 12517 12639 12704 13141 13344 13386 13411 13554 13703 13930 14959 15067 15097 15100 15135 15193 15314 15872 15885 17750 17767 17788 17813 17879 18001 18005 18094 18135 18178 18215 18230 18259 18293 18354 18370 18804 18870 18878 18898-18899 18901 19061 19153 19210 19242 19256 19315 19360 19415 19429 19466 19469 19514 19652 19697 19811 19888 19901 19957 19963 20046 20167 20241 20310 20371 20381 21773 21831 21868 21876 22524 23088 23220 23259 23335 23876 23905 23967 24224 24248 24332 25817 25832 25870 25904 25944 26018 26023 26048 26056 26066 26154 26164 26248 26276 26284 26298 26376 26382 26391 26397 26425 26446 26471 26485 26487 26504 26511 26530 26553 26591 26607 26845 26886 26961 27015 27038 27061 27131 27142 27183 27195 27202 27242 27281 27438 27445 27466 27503 27538 27670 27682 27696 27708 27727 27734 27765 27817 27820-27821 27850 27853 27870 27942 27998 28001 28019 28041 28054 28060 28084 28093 28115-28116 28139 28165 28180 28290 28318 28345 28423 28444 28494 28567 28594 28599 31303 31330 31402 31487 31492 31506 31509 31542 31571 31678 31680-31681 31710 31717 32034 32280 32400 32409 32437 32474 32549 32648 32676 32694 49105https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/931/147?format=asciiOpticaldefaultJ/ApJ/931/147/table2Stellar parameters of the program starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDShort ID of a star, Paper I (Aoki+ 2022, J/ApJ/931/146)meta.idcharprimaryRAJ2000Right Ascension in degrees (J2000)degpos.eq.ra;meta.mainDEJ2000[-7.1/60.6] Declination in degrees (J2000)degpos.eq.dec;meta.mainRVel[-454/434] Radial velocity (observed)km/sphys.veloc;pos.heliocentricfloatSNR[6.9/157] Spectral SNR around 4500 Angstromstat.snrfloatTeff[4290/6731] Effective temperature derived from Subaru spectraKphys.temperature.effectiveinte_Teff[7/584] Uncertainty on TeffKstat.error;phys.temperature.effectiveintlogg[0.5/4.8] Surface gravity derived from Subaru spectralog(cm.s**-2)phys.gravityfloate_logg[0.01/0.7] Uncertainty on logglog(cm.s**-2)stat.errorfloatf_logg[0/1]? Flag on logg (1)meta.codeintnullableFeH[-4.4/-0.6] Metallicity derived from Subaru spectraphys.abund.Fefloate_FeH[0.08/0.4] Uncertainty on FeHstat.errorfloatvt[0/4.1] Microturbulent velocity derived from Subaru spectrakm/sphys.velocfloate_vt[0.03/0.3] Uncertainty on Vtkm/sstat.errorfloatlogLum[-0.5/3.4] Luminosity derived from the Subaru spectralog(solLum)phys.luminosity;em.optfloate_logLum[0.017/0.7] Uncertainty on logLumlog(solLum)stat.errorfloatTeff-L[4376/6597] Effective temperature derived from LAMOST spectraKphys.temperature.effectiveintlogg-L[0.8/5.2] Surface gravity derived from LAMOST spectralog(cm.s**-2)phys.gravityfloatFeH-L[-4.2/-1.3] Metallicity derived from LAMOST spectraphys.abund.FefloatAbundDisplay the abundance data for this source (link to Table 3)meta.ref.urlcharSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/ApJ/931/147/table3Abundances and abundance error estimations of the program starsIDShort ID of a star, Paper I (Aoki+ 2022, J/ApJ/931/146)meta.idcharl_logepsLimit flag for logepsmeta.code.errorcharl_XFeLimit flag for XFemeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlogeps[-2.9/8.42]? Log number abundance of Ionmeta.id;meta.mainfloatnullableXFe[-2.2/4.6]? Abundance ratio of [X/Fe]phys.abundfloatnullablesigTeff[-0.31/0.5]? Abundance error associated with Teff uncertaintystat.errorfloatnullablesiglogg[-0.26/0.26]? Abundance error associated with logg uncertaintystat.errorfloatnullablesigFeH[-0.15/0.11]? Abundance error associated with [Fe/H] uncertaintystat.errorfloatnullablesigvt[-0.22/0.14]? Abundance error associated with microturbulent velocity uncertaintystat.errorfloatnullablesigN[0/0.8]? Abundance error associated with measurement uncertaintystat.errorfloatnullablesigTot[0.01/0.8]? Total abundance errorstat.errorfloatnullableNl[0/163] Number of adopted linesmeta.numberintIonSpecies of atomphys.atmol.ionStagechar