J/A+A/312/111ivo://CDS.VizieR/J/A+A/312/111doi:10.26093/cds/vizier.33120111CDSJurcsik J.Kovacs G.2017-10-12T13:00:21Z2013-09-03T13:55:19ZCDS support team

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

cds-question@unistra.frvariable-starsmetallicityWe present an accurate and robust method for the calculation of [Fe/H] from the light curves of RRab stars. The method introduces a considerable improvement relative to our previously published formulae. First of all, it uses an improved and extended data base for the light curves and more accurate, very recent iron abundances. Secondly, the new data base makes it possible to show that the basic relation between [Fe/H] and the Fourier parameters is linear and contains only the period and one of the Fourier phases, most importantly {phi}_31_. Last but not least, we derive interrelations among the Fourier parameters which help us to filter out peculiar stars where more caution is needed in accepting the calculated abundance. The applicability of the method is demonstrated on independent samples of globular cluster stars. Peculiarities encountered in Blazhko variables and in some other cases are also discussed. The Fourier decomposition is defined by the formula: V(t) = A0 + A1*sin(2*pi/P*(t-t0)+phi1) + A2*sin(2*pi*2/P*(t-t0)+phi2) +... + A15*sin(2*pi*15/P*(t-t0)+phi15) V(t) -- light curve in Johnson V P -- period t0 -- Epoch = 2400000.01996A&A...312..111Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/312/111CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/312/111https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/312/111http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/312/111https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/312/111https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/312/111http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/312/111GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/312/111/table1 (Fourier coefficients)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/312/111/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/312/111/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/312/111/table1?GETtext/xml+votable180.050000true5.929538929.40101030.0055555555555555566/110 1663 2629 4479 4833 5182 5708 6301 6744 7174 7518 8466 9509 10541 10584 11492 11961 12512 12743 12918 13680 14994 16022 16867 16923 17328 18080 18177 18502 18964 19104 19110 19169 20303 21127 21146 21182 24866 25199 26131 26281 26515 26894 26981 27824 28143 28383 28582 30019 30055 30923 31054 31335 31390 31648 31743 31866 32257 32636 32663 33465 33996 34229 34537 36704 36781 38809 38942 40553 40767 40998 41318 41991 43405 43888 44498 44914 45765 46130 46246 46327 47821 48113https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/312/111?format=asciiOpticaldefaultJ/A+A/312/111/table1Fourier coefficientsphi9Fourier coefficient {phi}_9_radstat.FourierfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharn_Name[*] Shifted segments of data (1)meta.notecharPPerioddtime.perioddoubleA0Fourier coefficient A0magphot.mag;stat.meanfloatNNumber of data point usedmeta.numberintSigmastandard deviation {sigma}stat.stdevfloatA1Fourier coefficient A1magsrc.var.amplitudefloatphi1Fourier coefficient {phi}_1_radstat.FourierfloatA2Fourier coefficient A2magsrc.var.amplitudefloatphi2Fourier coefficient {phi}_2_radstat.FourierfloatA3Fourier coefficient A3magsrc.var.amplitudefloatphi3Fourier coefficient {phi}_3_radstat.FourierfloatA4Fourier coefficient A4magsrc.var.amplitudefloatphi4Fourier coefficient {phi}_4_radstat.FourierfloatA5Fourier coefficient A5magsrc.var.amplitudefloatphi5Fourier coefficient {phi}_5_radstat.FourierfloatA6Fourier coefficient A6magsrc.var.amplitudefloatphi6Fourier coefficient {phi}_6_radstat.FourierfloatA7Fourier coefficient A7magsrc.var.amplitudefloatphi7Fourier coefficient {phi}_7_radstat.FourierfloatA8Fourier coefficient A8magsrc.var.amplitudefloatphi8Fourier coefficient {phi}_8_radstat.FourierfloatA9Fourier coefficient A9magsrc.var.amplitudefloatA10Fourier coefficient A10magsrc.var.amplitudefloatphi10Fourier coefficient {phi}_10_radstat.FourierfloatA11Fourier coefficient A11magsrc.var.amplitudefloatphi11Fourier coefficient {phi}_11_radstat.FourierfloatA12Fourier coefficient A12magsrc.var.amplitudefloatphi12Fourier coefficient {phi}_12_radstat.FourierfloatA13Fourier coefficient A13magsrc.var.amplitudefloatphi13Fourier coefficient {phi}_13_radstat.FourierfloatA14Fourier coefficient A14magsrc.var.amplitudefloatphi14Fourier coefficient {phi}_14_radstat.FourierfloatA15Fourier coefficient A15magsrc.var.amplitudefloatphi15Fourier coefficient {phi}_15_radstat.FourierfloatSimbadSimbad column added by the CDSmeta.refchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main