J/AJ/144/39ivo://CDS.VizieR/J/AJ/144/39doi:10.26093/cds/vizier.51440039CDSLe Borgne J.-F.Klotz A.Poretti E.Boer M.Butterworth N.Dumont M.,Dvorak S.Hambsch F.-J.Hund F.Kugel F.Vandenbroere J.Vilalta J.M.2017-10-13T15:41:00Z2013-10-10T14:16:23ZCDS support team

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

cds-question@unistra.frvariable-starsphotometryWe used the GEOS database to study the Blazhko effect of galactic RRab stars. The database is continuously enriched by maxima supplied by amateur astronomers and by a dedicated survey by means of the two TAROT robotic telescopes. The same value of the Blazhko period is observed at different values of the pulsation periods and different values of the Blazhko periods are observed at the same value of the pulsation period. There are clues suggesting that the Blazhko effect is changing from one cycle to the next. The secular changes in the pulsation and Blazhko periods of Z CVn are anticorrelated. The diagrams of magnitudes against phases of the maxima clearly show that the light curves of Blazhko variables can be explained as modulated signals, both in amplitude and in frequency. The closed curves describing the Blazhko cycles in such diagrams have different shapes, reflecting the phase shifts between the epochs of the brightest maximum and the maximum O-C. Our sample shows that both clockwise and counterclockwise directions are possible for similar shapes. The improved observational knowledge of the Blazhko effect, in addition to some peculiarities of the light curves, has yet to be explained by a satisfactory physical mechanism.2012AJ....144...39Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/144/39CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/corot : CoRoT observation log Release 13 (CoRoT, 2009-2013)B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)J/A+A/549/A101 : Known Galactic field Blazhko stars (Skarka, 2013)J/MNRAS/415/1577 : CoRoT 105288363 Blazhko modulation (Guggenberger+, 2011)J/A+A/520/A108 : CoRoT 101128793 light curves (Poretti+, 2010)J/A+A/510/A39 : CoRoT light curves of V1127 Aql (Chadid+, 2010)J/AJ/133/1470 : TAROT suspected variable star catalog (Damerdji+, 2007)J/A+A/476/307 : Period variations in galactic RRab stars (Le Borgne+, 2007)J/MNRAS/368/1757 : Catalogue of RR Lyrae from NSVS (Wils+, 2006)J/ApJ/651/197 : OGLE RR Lyr in Galactic Bulge (Collinge+, 2006)J/A+A/430/1049 : RR Gem BV(RI)c differential photometry (Jurcsik+, 2005)J/A+A/371/986 : Monoperiodic pulsating stars in OGLE (Poretti, 2001)J/A+A/322/817 : Theoretical RRab light curves properties (Feuchtinger+ 1997)http://rr-lyr.ast.obs-mip.fr/dbrr/ : The GEOS databasehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/144/39https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/144/39http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/144/39https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/144/39https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/144/39http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/144/39GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/144/39/table1 (*RRab stars showing blazhko effect observed with TAROTs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/39/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/39/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/39/table1?GETtext/xml+votable180.050000true218.388389731.75462310.005555555555555556Cone search capability for table J/AJ/144/39/table2 (RRab stars showing a known blazhko effect and not discussed in this paper)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/144/39/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/144/39/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/144/39/table2?GETtext/xml+votable180.050000true5.929538929.40101030.0055555555555555566/1028 1753 2157 2238 2254 2703 3329 4286 4833 4942 4998 5301 6301 7271 7768 7950 7979 9138 9547 9717 9769 9938 10169 10524 10638 10862 11098 12686 13066 13171 13618 14217 14581 14731 14735 14823 14857 14918 14950 14953 14955 14956 14961 14967 14971 14994 15014 15106 15136 15148 15156 15220 16018 16127 16308 16867 17112 18151 19449 19718 20097 20303 20497 21961 22571 22848 24772 24784 24866 25308 25491 25611 25953 26053 26557 26999 27361 27474 28030 28385 28525 28813 29225 30464 30466 30472 30875 31456 31886 31968 32052 32180 32239 32282 32294 32381 32415 32626 33197 33951 34236 34240 35399 36048 36198 36363 36605 36912 37095 37544 37911 38087 38898 40806 40988 41191 41260 41946 42260 42604 42658 43491 44595 44838 45062 45086 45164 45767 45899 46220 46641 46975 47598 47776 48911https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/144/39?format=asciiOpticaldefaultJ/AJ/144/39/table1*RRab stars showing blazhko effect observed with TAROTsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStatStatus: I=stars with known Blazhko effect, or II=new Blazhko RR Lyr starsmeta.codenullablePer[0.3687/0.6539] Pulsational perioddtime.periodfloatPB1[7.23/533]? Known Blazhko perioddtime.periodfloatnullabler_PB1Reference for PB1 (1)meta.ref;pos.framecharNmax[9/136] Number of maxima collectedmeta.idintAmp[0.8/1.35]? Amplitudemagphot.magfloatnullablePB2[7.209/532.481] New Blazhko perioddtime.periodfloatu_PB2Uncertainty flag on PB2meta.code.errorcharA(O-C)[0.004/0.063] Full amplitude of the O-C (observed minus calculated time of maximum brightness T_max_) valuedsrc.var.amplitude;stat.fit.omcfloatl_A(Vmax)[>=] Upper limit on A(Vmax)meta.code.errorcharA(Vmax)[0.1/0.75]? Full amplitude of the V_max_ (magnitude at maximum) valuemagsrc.var.amplitudefloatnullableEp(O-C)Epoch (HJD-2450000) of the O-C (observed minus calculated T_max_) valuedtime.epochdoubleEp(Vmax)[152.137/5609.961]? Epoch (HJD-2450000) of the V_max_ (magnitude at maximum) valuedtime.epochdoublenullablePhase? Phase shift {Delta}{Phi}(P_B_) between the epochs of the brightest maximum and the maximum O-C (expressed as a function of the Blazhko period)dtime.phasefloatnullableSimbadSimbad column added by the CDSmeta.refchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainStarStar namemeta.id;meta.maincharJ/AJ/144/39/table2RRab stars showing a known blazhko effect and not discussed in this paperrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar namemeta.id;meta.maincharf_StarFlag on Star (1)meta.codecharPerPulsational perioddtime.periodfloatl_PB1Lower limit on PB1meta.code.errorcharPB1Known Blazhko perioddtime.periodfloatu_PB1Uncertainty flag on PB1meta.code.errorcharr_PB1[a] Origin of PB1 (2)meta.ref;pos.framecharPB2? Second value for the known Blazhko perioddtime.periodintnullabler_PB2[b] Origin of PB2 (2)meta.ref;pos.framecharRefReference (3)meta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main