First quintuplet frequency solution of a Blazhko variable: light curve analysis of RV UMa

Abstract

RV UMa is one of the RRab stars showing regular large amplitude light curve modulation. Extended photoelectric observations of RV UMa obtained at the Konkoly Observatory were published by Kanyo (1976). The analysis of the data was published by Kovacs (1995). After detecting an error in the reduction procedure of the published Konkoly data, corrected photometric data are presented with additional, previously unpublished measurements. The reanalysis of the combination of the corrected Konkoly data supplemented with Preston & Spinrad's (1967) observations has led to the discovery that the adequate mathematical model of the light curve is, in fact, a quintuplet, instead of a triplet frequency solution. This finding has crucial importance in the interpretation of the Blazhko phenomenon, as triplet (doublet) is the preferred structure in the resonance models, quintuplet in the magnetic models. Period changes of both the pulsation and the modulation light variations of RV UMa have been detected based on its century long photometric observations. An overall anticorrelation between the pulsation and the modulation period changes can be defined with dP_{Bl} / dP_0 = -8.6 pm 10^4 gradient, i.e., the modulation period is longer if the pulsation period is shorter. Between 1946 and 1975 the pulsation and modulation periods showed, however, parallel changes, which points to that there is no strict relation between the changes in the periods of the pulsation and the modulation.

22 pages, 8 figures, accepted for publication in The Astronomical Journal

References in corpus (6)

• The MACHO Project LMC Variable Star Inventory. IX. Frequency Analysis of the First Overtone RR Lyrae Stars and the Indication for Nonradial Pulsations
• The MACHO Project Large Magellanic Cloud variable star inventory. XI. Frequency analysis of the fundamental mode RR Lyrae stars
• The Changing Blazhko Effect of XZ Cygni
• The shortest modulation period Blazhko RR Lyrae star: SS Cnc
• The Blazhko behaviour of RR Geminorum II -- long-term photometric results
• The Blazhko behavior of RV UMa

Cited by in corpus (21)

• Kepler photometry of the prototypical Blazhko star RR Lyr: An old friend seen in a new light
• Standard Galactic Field RR Lyrae. I. Optical to Mid-infrared Phased Photometry
• Blazhko RR Lyrae light curves as modulated signals
• The CoRoT star 105288363: strong cycle to cycle changes of the Blazhko modulation
• An extensive photometric study of the Blazhko RR Lyrae star MW Lyr: I. Light curve solution
• Cyclic variations in O-C diagrams of field RR Lyrae stars as a result of LiTE
• The Multi-periodic Blazhko Modulation of CZ Lacertae
• An extensive photometric study of the Blazhko RR Lyrae star DM Cyg
• Long-term photometric monitoring of Messier 5 variables: II. Blazhko stars
• Bright Blazhko RRab Lyrae stars observed by ASAS and the SuperWASP surveys
• The historical vanishing of the Blazhko effect of RR Lyr from GEOS and Kepler surveys
• The Determination Of Reddening From Intrinsic VR Colors Of RR Lyrae Stars
• Known Galactic field Blazhko stars
• The all-sky GEOS RR Lyr survey with the TAROT telescopes. Analysis of the Blazhko effect
• Can turbulent convective variations drive the Blazhko cycle? Dynamical investigation of the Stothers idea
• An extensive photometric study of the Blazhko RR Lyrae star RZ Lyr
• A double-modulation effect detected in a double-mode high-amplitude $\delta$ Scuti star: KIC 10284901
• A photometric study of the southern Blazhko star SS For Unambiguous detection of quintuplet components
• The Unique Frequency Spectrum of the Blazhko RRc Star LS Her
• Photometric study of the star with changing Blazhko effect: TV~Bootis
• Blazhko effect in Cepheids and RR Lyrae stars