منابع مشابه
Double-mode Rr Lyrae Variables: Pulsational Masses Revisited
Double-mode RR Lyrae variables (i.e. radial variables which are simultaneously pulsating in both fundamental and first overtone modes) appear a fundamental tool for investigating the mass of old Population II Horizontal Branch (HB) stars. The most widespread method adopted for evaluating the masses of these objects is based on the Petersen (1973) approach, which relies only on pulsational perio...
متن کاملDouble mode RR Lyrae stars in Omega Centauri
Aims. The aim of this work was to search for double mode pulsators among RR Lyr variables of globular cluster ω Cen. Methods. We conducted a systematic frequency analysis of CASE photometry of ω Cen RR Lyr stars. We searched for periodicities using Fourier and ANOVA periodograms, combined with consecutive prewhitening technique. Results. We discovered six double mode pulsators, with the first o...
متن کاملLetter to the Editor A nonlinear model for RR Lyrae double mode pulsation
The Vienna nonlinear code for modelling pulsating stars is applied to the problem of RR Lyrae double mode pulsation. For stellar parameters of M = 0.65 M , log(L/L ) = 1.72 and XYZ=(0.760, 0.239, 0.001) we find a stable double mode solution in a small effective temperature range around 6820 K. The fundamental period is given by P0 = 0.5279 days and period and amplitude ratios corresponding to P...
متن کاملOn the double-mode RR Lyrae variables of the Sculptor dwarf galaxy
Frequency analysis of more than 300 stars of the ogle data base on Sculptor galaxy has led to the discovery of 18 double-mode RR Lyrae (RRd) variables. This yields a 20% incidence rate for double-mode pulsation among the variables previously classified as first overtone RR Lyrae stars in this galaxy. Most of the RRd stars cover the period range of 0. 47 < P0 < 0. 49 but there are two stars with...
متن کاملPhysical properties of double-mode RR Lyrae stars based on pulsation and evolution models
We determine the fundamental stellar parameters of altogether 20 double-mode RR Lyrae (RRd) stars from the Galactic Field and the Large Magellanic Cloud, following our approach employed on the field RRd star BS Comae [1]. The stars were selected to cover wide ranges of periods and period ratios, implying diverse stellar parameters. From the possible observed quantities we use only the periods a...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1988
ISSN: 0074-1809
DOI: 10.1017/s0074180900158425