J/MNRAS/453/2022ivo://CDS.VizieR/J/MNRAS/453/2022doi:10.26093/cds/vizier.74532022CDSNetzel H.Smolec R.Moskalik P.2024-08-15T20:15:12Z2016-05-24T10:09:49ZCDS support team

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

cds-question@unistra.frvariable-starsmilky-way-galaxyWe analyse the OGLE-IV photometry of the first overtone and double-mode RR Lyrae stars (RRc/RRd) in the two fields towards the Galactic bulge observed with high cadence. In 27 per cent of RRc stars, we find additional non-radial mode, with characteristic period ratio, P_x_/P_1O_{include.in}(0.6, 0.64). It strongly corroborates the conclusion arising from the analysis of space photometry of RRc stars, that this form of pulsation must be common. In the Petersen diagram the stars form three sequences. In 20 stars, we find two or three close secondary modes simultaneously. The additional modes are clearly non-stationary. Their amplitude and/or phase vary in time. As a result, the patterns observed in the frequency spectra of these stars may be very complex. In some stars, the additional modes split into doublets, triplets or appear as a more complex bands of increased power. Subharmonics of additional modes are detected in 20 per cent of stars. They also display a complex structure. Including our previous study of the OGLE-III Galactic bulge data, we have discovered 260 RRc and 2 RRd stars with the additional non-radial mode, which is the largest sample of these stars so far. The additional mode is also detected in two Blazhko RRc stars, which shows that the modulation and additional non-radial mode are not exclusive.2015MNRAS.453.2022Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/453/2022CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AcA/61/1 : VI light curves of Galactic Bulge RR Lyrae (Soszynski+, 2011)J/AcA/64/177 : OGLE Galactic Bulge Fields RR Lyrae stars (Soszynski+, 2014)J/ApJ/651/197 : Galactic Bulge OGLE fundamental-mode RR Lyr (Collinge+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/453/2022https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/453/2022http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/453/2022https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/453/2022https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/453/2022http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/453/2022GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/453/2022/tablea1 (Properties of stars with non-radial mode (OGLE-IV))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/453/2022/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/453/2022/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/453/2022/tablea1?GETtext/xml+votable180.050000true267.5994167-30.20491670.0055555555555555565/7205 6/28864 28866https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/453/2022?format=asciidefaultJ/MNRAS/453/2022/tablea1Properties of stars with non-radial mode (OGLE-IV)AxAmplitude of additional modemagphot.magdoubleAx/A1OAx-to-A10 amplitude ratiosrc.var.amplitude;arith.ratiodoubleRemRemarks (1)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameOGLE-BLG-RRLYR- numbermeta.id;meta.mainintP10Period of the first overtonedtime.perioddoublePxPeriod of additional modedtime.perioddoublePx/P1OPx-to-P10 period ratiotime.perioddoubleA10Amplitude of the first overtonemagphot.magdoubleSimbadSimbad 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