J/MNRAS/466/2602ivo://CDS.VizieR/J/MNRAS/466/2602doi:10.26093/cds/vizier.74662602CDSPrudil Z.Skarka M.2024-08-17T20:17:46Z2019-11-27T14:29:48ZCDS support team

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

cds-question@unistra.frvariable-starsWe present the first paper of a series focused on the Blazhko effect in RR Lyrae type stars pulsating in the fundamental mode that are located in the Galactic bulge. A comprehensive overview of the incidence rate and light-curve characteristics of the Blazhko stars is given. We analysed 8282 stars having the best quality data in the OGLE-IV survey, and found that at least 40.3 per cent of the stars show modulation of their light curves. The number of Blazhko stars we identified is 3341, which is the largest sample ever studied, implying that these are the most relevant statistical results currently available. Using combined data sets with OGLE-III observations, we found that 50 per cent of the stars that show unresolved peaks close to the main component in OGLE-IV are actually Blazhko stars with extremely long periods. Blazhko stars with modulation occur preferentially among RR Lyrae stars with shorter pulsation periods in the Galactic bulge. Fourier amplitude and phase coefficients based on the mean light curves appear to be substantially lower for Blazhko stars than for stars with an unmodulated light curve on average. We derived new relations for the compatibility parameter D_m_ in the I passband and relations that allow for differentiating modulated and non-modulated stars easily based on R_31_, {phi}_21_ and {phi}_31_. Photometric metallicities, intrinsic colours and absolute magnitudes computed using empirical relations are the same for Blazhko and non-modulated stars in the Galactic bulge, suggesting there is no correlation between the occurrence of the Blazhko effect and these parameters.2017MNRAS.466.2602Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/466/2602CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AcA/64/177 : VI light curves of Galactic Bulge RR Lyrae (Soszynski+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/466/2602https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/466/2602http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/466/2602https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/466/2602https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/466/2602http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/466/2602GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/466/2602/table1 (BL stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/466/2602/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/466/2602/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/466/2602/table1?GETtext/xml+votable180.050000true258.22375-29.47808330.0055555555555555564/1795 5/7178-7179 7192 7194-7195 7205 7216-7217 7220 7313 6/28687 28707 28709-28711 28772 28774-28775 28792 28794-28795 28800-28801 28804 28816-28817 28819 28828-28829 28842-28843 28851 28854 28856-28857 28859-28860 28862 28872-28873 28876 28884 28888-28889 28906-28907 28911 29184-29185 29248-29249 29251 29264 42495 42837https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/466/2602?format=asciidefaultJ/MNRAS/466/2602/table1BL starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOGLEOGLE identification number (OGLE BLG-RRLYR-NNNNN in Simbad)meta.id;meta.mainintGroupGroup (1)meta.idcharK2-9[0/2] observability in Kepler K2 campaigns 9 (2)meta.codeintK2-11[0/2] observability in Kepler K2 campaigns 11 (2)meta.codeintRemRemarks (3)meta.notecharRTRise time (phase difference between maximum and minimum light)time.intervalfloat[Fe/H]? Metallicityphys.abund.Zfloatnullable(V-I)0? Deredenned V-I colour indexmagphot.color;em.opt.V;em.opt.IfloatnullableiMAG? Absolute i magnitudemagphys.magAbsfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_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