Automated nonlinear stellar pulsation calculations: Applications to RR Lyrae stars
نویسندگان
چکیده
منابع مشابه
Automated Nonlinear Stellar Pulsation Calculations: Applications to RR Lyrae stars The Slope of the Fundamental Blue Edge and the First RRd Model Survey
We describe a methodology that allows us to follow the pulsational behavior of an RR Lyrae model consistently and automatically along its evolutionary track throughout the whole instability strip. It is based on the powerful amplitude equation formalism, and resorts to a judicious combination of numerical hydrodynamical simulations, the analytical signal time-series analysis, and amplitude equa...
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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...
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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...
متن کاملRr Lyrae Stars in the Macho Database
The MACHO Project has catalogued 8000 RR Lyrae stars in the Large Magellanic Cloud, 1800 in the Galactic bulge, and 50 in the Sgr dwarf galaxy. These variables are excellent distance indicators, and are used as tools to study the structure of the Large Magellanic Cloud and the bulge. The large datasets also probe uncommon pulsation modes. A number of double-mode RR Lyrae stars (RRd) are found i...
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The Vienna nonlinear convective pulsation code is applied to the case of RR Lyrae stars. Assuming two sets of stellar parameters (M = 0.65M , L = 52.5 L , Z = 0.001 and M = 0.75 M , L = 52.5 L , Z = 0.0001) we compute fundamental and first overtone limit cycle solutions for effective temperatures ranging from 6000 to 7100K. The resulting lightand radial velocity curves are compared in detail wi...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2004
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20035698