Measurement and theory of turbulence in RR Lyrae
نویسندگان
چکیده
منابع مشابه
Rr Lyrae – Theory Vs Observation
The luminosities, effective temperatures and metallicities that are derived empirically by Kovács and Jurcsik from the light curves of a large number of globular cluster and field RRab and RRc stars are compared to theoretical RR Lyrae models. The strong luminosity dependence of the empirical blue and red edges (LogL vs. LogTeff diagram) is in disagreement with that of both radiative and convec...
متن کاملRR Lyrae Distance Scale: Theory and Observations
The RR Lyrae distance scale is reviewed. In particular, we discuss theoretical and empirical methods currently adopted in the literature. Moreover, we also outline pros and cons of optical and near-infrared mean magnitudes to overcome some of the problems currently affecting RR Lyrae distances. The importance of the Kband Period-Luminosity-Metallicity (PLZK) relation for RR Lyrae is also discus...
متن کاملStrange Cepheids and Rr Lyrae
Strange modes can occur in radiative classical Cepheids and RR Lyrae models. These are vibrational modes that are trapped near the surface as a result of a ’potential barrier’ caused by the sharp hydrogen partial ionization region. Typically the modal number of the strange mode falls between the 7th and 12th overtone, depending on the astrophysical parameters of the equilibrium stellar models (...
متن کاملFourier Decomposition of RR Lyrae Pulsations: Theory Versus Observations
Fourier decomposition is employed to compare the light curves of RR Lyrae stars with those emerging from hydrodynamic models. Very good agreement is obtained between theory and observation for the RRc stars, but in the case of the RRab stars there are significant discrepancies in the Fourier phase quantities 4>21 and 4>31' The deficiencies of the models are not remedied by replacing Carson opac...
متن کاملShock waves and microturbulence in RR Lyrae
A time variation of the microturbulence velocity vturb in the atmosphere of RR Lyrae is estimated from a comparison of the observed and theoretical FWHM curves of the Fe II 4923.921 Å absorption line. The theoretical line profiles were obtained using a hydrodynamical RR Lyrae model, discussed in Fokin & Gillet (1997). The estimated value of the vturb varies from 2 to 7 km/s, with a maximum at t...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1985
ISSN: 0004-637X,1538-4357
DOI: 10.1086/163567