Stars of very low metal abundance. I

Stars of very low metal abundance. IJ/AJ/90/2089ivo://CDS.VizieR/J/AJ/90/2089doi:10.26093/cds/vizier.50902089CDSBeers T.C.Preston G.W.Shectman S.A.2021-09-17T08:22:14Z2005-12-16T14:03:59ZCDS support team

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

cds-question@unistra.frchemically-peculiar-starshalo-starsspectroscopyAn objective-prism and a narrowband interference filter have been used in combination on the Curtis Schmidt telescope at CTIO to conduct a search for extremely metal-poor stars. The filter restricts the bandpass to the region around the H and K lines of CaII; the metal-poor candidates are those stars with weak or absent H and K. Slit spectra (1 A resolution) of some 450 candidates are used to measure equivalent widths of the CaII K line and Balmer features. A calibration of the K-line strength for giants in the metal-poor globular cluster NGC 6397 and field dwarfs and giants of known metallicity is used to identify survey candidates with metal abundance [Fe/H]<=-2.0; a list of 134 such stars is presented. UBV photometry is used to distinguish between two groups of metal-poor stars: a group with objects near the main-sequence turnoff, on the subgiant branch, and on the giant branch; and a second group with objects on the red horizontal branch (RHB) and asymptotic giant branch (AGB). The RHB-AGB stars exhibit the well-known weak G-band effect; three CH-strong objects are identified among the subgiants.1985AJ.....90.2089Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/90/2089CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/87/1515 : UBV photometry of AB stars in halo (Pier, 1982)J/ApJS/53/791 : Spectroscopy of AB stars in halo (Pier, 1983)J/PASP/102/1392 : UBV photometry from HK survey. (Doinidis+ 1990)J/PASP/103/973 : Photoelectric UBV from HK survey. (Doidinis+ 1991)J/ApJS/76/1001 : UBV photometry of HK survey stars (Preston+, 1991)J/AJ/103/267 : Spectrocopy of hot stars in galactic halo (Beers+ 1992)J/AJ/103/1987 : Stars of very low metal abundance (Beers+ 1992)J/AJ/108/268 : HK survey emission-line candidates positions (Beers+ 1994)J/AJ/108/538 : Metal-poor MS stars UBV photometry (Preston+ 1994)J/AJ/112/1188 : HK survey emission-line candidates (Beers+ 1996)J/AJ/117/2329 : Spectroscopy of hot stars in the halo. (Wilhelm+, 1999)J/ApJS/123/639 : UBV photometry of metal-weak candidates (Norris+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/90/2089https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/90/2089http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/90/2089https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/90/2089https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/90/2089http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/90/2089GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/90/2089/table1 (Objective-prism survey plate log)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/90/2089/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/90/2089/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/90/2089/table1?GETtext/xml+votable180.050000true15.4488-12.91460.005555555555555556Cone search capability for table J/AJ/90/2089/table3 (Velocities of standard stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/90/2089/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/90/2089/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/90/2089/table3?GETtext/xml+votable180.050000true47.106618326.33094470.005555555555555556Cone search capability for table J/AJ/90/2089/table4 (Standard-star line indices)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/90/2089/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/90/2089/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/90/2089/table4?GETtext/xml+votable180.050000true265.1749983-53.83354140.005555555555555556Cone search capability for table J/AJ/90/2089/table5 (Metal-poor stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/90/2089/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/90/2089/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/90/2089/table5?GETtext/xml+votable180.050000true335.263833-40.5228440.0055555555555555566/798 4376 8210 8363 12424 12621 12704 16409 16419 16421 16432-16433 16461-16462 16465 16467 16470 16473 16485 16496-16497 16501 16512 16514 16518 16520 16663 16665-16666 16669 16711 16717 16726 16821 17136 17237 17359 17386 17416 17491 17496 17544 17558 17942 17957 18474 18521 18534 18582 18713 18778 20646 25699 25747 26025 26289 26457 27075 27330 30577 30962 31408 31596 33470-33471 33515 33517 33596 33633 33638 33641-33642 33644 33728 34222 34598 34710 34792 34881 34888 35532 35771 36175 36303 36309 36330 36557 36648 36687 36693 36714 36762 36777 36821 36826 36842 38506 40567 40716 44208 44264 44281 44542 44632 44816 44884 45415 45421 45478-45479 45482-45483 45486-45487 45491 45785 45793 45796-45797 45801 45803-45804 45818 45825 45859 45868 45871 45881 46071 46080 46082 46462 46551 46553 46558-46559 46561 46563 46565 46575-46576 46580 46584-46585 46623 46647 46679 46685-46686 46689 46691 46694-46695 46699-46700 46703-46705 46707 46742 46751 46759 46761 46763-46765 46786-46787 46790-46792 46796 46849 46851 46856 47192-47193 47204 47207 47217 47309 47434 47451 47455 47467 47470-47472 47476 47478 47483-47484 47519 47538 47540 47544 47556-47558 47564 47838 47876 48064 48131 48138 48145 48160 48552 48602 48729 488513.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/90/2089?format=asciidefaultJ/AJ/90/2089/table1Objective-prism survey plate logBPS-CSPlate number (Curtis Schmidt)obs.fieldintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.decnullableindexed

J/AJ/90/2089/table3Velocities of standard starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStarmeta.id;meta.maincharRVcatRadial velocity from Carney (1981ApJ...245..238C)km/sspect.dopplerVelocintRVobsObserved radial velocitykm/sspect.dopplerVeloc;pos.heliocentricinte_RVobsError on radial velocitykm/sstat.errorintDRVDifference between the observed and taken from literature radial velocitykm/sspect.dopplerVeloc;arith.diffintSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullable

J/AJ/90/2089/table4Standard-star line indicesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharEW(K)CaII K-line index (G1)0.1nmspect.line.eqWidthfloate_EW(K)? Error on K index0.1nmstat.errorfloatnullableEW(H')H' line index (G1)0.1nmspect.indexfloate_EW(H')? Error on H'0.1nmstat.errorfloatnullableEW(G)G-band line index (G1)0.1nmspect.line.eqWidthfloate_EW(G)? Error on G0.1nmstat.errorfloatnullableB-VB-V colour indexmagphot.color;em.opt.B;em.opt.Vfloat[Fe/H]Metallicity [Fe/H]Sunphys.abund.ZfloatLC[dg] luminosity lass: 'g' (giant) when the star lies above the main-sequence turnoff, 'd' (dwarf) when the star lies below the main-sequence turnoffphys.luminositycharRefsReferences (2)meta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullable

J/AJ/90/2089/table5Metal-poor starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBPS-CSMetal poor candidate star namemeta.id;meta.maincharRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainGLONGalactic longitudedegpos.galactic.lonGLATGalactic latitudedegpos.galactic.latfloatHVHeliocentric velocitykm/sspect.dopplerVeloc;pos.heliocentricinte_HVError on heliocentric velocitykm/sstat.errorintVmagJohnson V magnitudemagphot.mag;em.opt.VfloatB-VJohnson (B-V) colormagphot.color;em.opt.B;em.opt.VfloatU-BJohnson (U-B) colormagphot.color;em.opt.U;em.opt.BfloatNobsNumber of photometric observationsmeta.numberintE(B-V)? Assumed reddeningmagphot.color.excessfloatnullableEW(K)CaII K-line index (G1)0.1nmspect.line.eqWidthfloate_EW(K)Error on CaII K-line index0.1nmstat.errorfloatEW(H')H' line index (G1)0.1nmspect.indexfloate_EW(H')Error on H' index0.1nmstat.errorfloatEW(G)G-band line index (G1)0.1nmspect.line.eqWidthfloate_EW(G)Error on G-band line index0.1nmstat.errorfloatSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.decnullableindexed