J/MNRAS/415/1577ivo://CDS.VizieR/J/MNRAS/415/1577doi:10.26093/cds/vizier.74151577CDSGuggenberger E.Kolenberg K.Chapellier E.Poretti E.Szabo R.,Benko J.M.Paparo M.2024-07-14T20:15:33Z2012-04-09T14:23:13ZCDS support team

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

cds-question@unistra.frvariable-starsspectroscopyWe present an analysis of the COnvection, ROtation and planetary Transits (CoRoT) star 105288363, a new Blazhko RR Lyrae star of type RRab (f0=1.7623d^-1^), observed with the CoRoT spacecraft during the second long run in the direction of the Galactic Centre (LRc02, time-base 145d). The CoRoT data are characterized by an excellent time-sampling and a low noise amplitude of 0.07mmag in the 2-12d^-1^ range and allow us to study not only the fine details of the variability of the star, but also long-term changes in the pulsation behaviour and the stability of the Blazhko cycle. We use, among other methods, standard Fourier analysis techniques and O-C diagrams to investigate the pulsational behaviour of the Blazhko star 105288363. In addition to the frequency pattern expected for a Blazhko RR Lyrae star, we find an independent mode (f1=2.984d^-1^) showing a f0/f1 ratio of 0.59 which is similar to that observed in other Blazhko RR Lyrae stars. The bump and hump phenomena are also analysed, with their variations over the Blazhko cycle. We carefully investigated the strong cycle-to-cycle changes in the Blazhko modulation (P_B_=35.6d), which seem to happen independently and partly diametrically in the amplitude and phase modulations. Furthermore, the phasing between the two types of modulations is found to change during the course of the observations.2011MNRAS.415.1577Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/415/1577CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/corot : CoRoT observation log Release 7 (CoRoT, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/415/1577https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/415/1577http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/415/1577https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/415/1577https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/415/1577http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/415/1577GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/415/1577/table1*List of frequencies, amplitudes and phases obtained from the analysis of the full data set (all cycles combined), assuming equidistant multipletsNameName of the frequencymeta.id;em.freqcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintType[FBTQI] Type of frequency (1)meta.codecharFreqFrequency (2)d**-1em.freqdoubleAmpAmplitude (Errors are 0.00028mag)magphot.magdoublephi[0/1] Phasetime.phasefloate_phi[0/1] rms uncertainty on phi obtained from a Monte Carlo (MC) simulation with Period04stat.errorfloatJ/MNRAS/415/1577/table3Observed maxima and minima of the pulsation of CoRoT ID 105288363recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEEpoch (cycle)meta.number;time.periodintTmax? Times of maximum (HJD-2450000)dtime.epochdoublenullablemagM? Relative magnitude at Tmaxmagphot.mag;arith.difffloatnullableO-CM? O-C at Tmaxdtime;arith.difffloatnullableTmin? Times of minimum (HJD-2450000)dtime.epochdoublenullablemagm? Relative magnitude at Tminmagphot.mag;arith.difffloatnullableO-Cm? O-C at Tmindtime;arith.difffloatnullable