Results 301 to 310 of about 499,224 (333)
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Astrophysics and Space Science, 1969
Evolutionary tracks of 0.9M ⊙, 0.7M ⊙ and 0.6M ⊙ models for Population II stars have been computed in the post-red giant phase. The stars are initially composed of a helium core containing a mass fraction equal to 0.9 and of a hydrogen-rich envelope.
V. Castellani, P. Giannone, A. Renzini
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Evolutionary tracks of 0.9M ⊙, 0.7M ⊙ and 0.6M ⊙ models for Population II stars have been computed in the post-red giant phase. The stars are initially composed of a helium core containing a mass fraction equal to 0.9 and of a hydrogen-rich envelope.
V. Castellani, P. Giannone, A. Renzini
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SPE Journal, 2012
Summary Horizontal and multibranch wells are likely to become the major means of modern exploitation strategies; inflow performances for these wells are needed. Because this paper considers the finite conductivity of a horizontal well, it establishes the inflow performance relationships (IPRs) for different branch configurations of ...
Huiqing Liu +3 more
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Summary Horizontal and multibranch wells are likely to become the major means of modern exploitation strategies; inflow performances for these wells are needed. Because this paper considers the finite conductivity of a horizontal well, it establishes the inflow performance relationships (IPRs) for different branch configurations of ...
Huiqing Liu +3 more
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Current problems on horizontal branch stars
Astrophysics and Space Science, 1973In the light of present knowledge on stellar evolution, it is shown that red ZAHB will not develop for very low metal globular clusters if Y is appreciably greater than 0.1. Recent determinations of the mass-sizes of the Re- cores at the time of the He-flash support independently conclusion that, if no increase in surface He-abundanice occurs between ...
F. Caputo, A. Natta, V. Castellani
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Current problems on horizontal branch stars
Astrophysics and Space Science, 1975Expected characteristics of RR Lyrae stars as a function of the evolutive parameters are reported. Results from both evolutionary and pulsational investigations are collected in a suitable form, to show the general constraints to any interpretative analysis of the observations.
Filippina Caputo, Vittorio Castellani
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A-Type Horizontal-Branch Stars
1975Horizontal-branch stars have attracted our attention as conspicuous examples of highly evolved population-II stars. Recent developments in the theoretical calculations of the internal structure of horizontal-branch stars (see Rood, 1970; Demarque and Mengel, 1971; Sweigart and Demarque, 1972) enable detailed studies on the evolutionary tracks ...
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Galactic Chemical Evolution: Insights From Field Horizontal Branch Stars
EAS Publications Series, 2015In this study we conducted the first large-sample red horizontal branch field star survey in the Milky Way. We carried out a detailed high-resolution spectroscopic abundance analysis of the RHB candidates. We also derived 12 C /13 C isotopic ratios, important indicators of stellar evolution, by using the CN features mainly located around the 8004 A.
Afsar, M. +4 more
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Pressure Transient Analysis for Horizontal Well and Multi-Branched Horizontal Wells
Proceedings of International Conference on Horizontal Well Technology, 1996Abstract Transient pressure for cases of a horizontal wellbore axis with any angle inclined to a fault or a constant pressure supply boundary in anisotropic formations were studied. This axis parallel to or perpendicular to a fault is only its a simple special case.
X.Y. Kong, X.Z. Xu, D.T. Lu
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Convective Overshooting in Horizontal Branch Stars
1987The evolution of horizontal branch stars up to the starting of the thermally pulsing regime of the He-burning shell is investigated with the aid of a non local treatment of the core convection. The formalism follows the overshooting model by Bressan et al (1981) which opposes to the classical, local schemes for overshooting and semiconvection currently
C. Chiosi, G. Bertelli, A. Bressan
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