منابع مشابه
Theoretical fits of the δ Cephei light , radius and radial velocity curves
We present a theoretical investigation of the light, radius and radial velocity variations of the prototype δ Cephei. We find that the best fit model accounts for luminosity and velocity amplitudes with an accuracy better than 0.8σ, and for the radius amplitude with an accuracy of 1.7σ. The chemical composition of this model suggests a decrease in both helium (0.26 vs 0.28) and metal (0.01 vs 0...
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We measured the radial velocity curve of the companion of the neutron star X-ray transient XTE J2123–058. Its semi-amplitude (K2) of 298.5±6.9 km s−1 is the highest value that has been measured for any neutron star LMXB. The high value for K2 is, in part, due to the high binary inclination of the system but may also indicate a high neutron star mass. The mass function ( f2) of 0.684± 0.047M⊙, a...
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We analyze data on pulsation amplitudes and phases for two β Cephei stars, δ Cet and ν Eri. Strömgren photometry and radial velocity measurements are used simultaneously to obtain constraints on mean parameters of the stars and identification of the excited modes. The inference about the radial mode order and mean star parameters is based on comparison of certain complex parameter, f , determin...
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قاعده مقتضی و مانع در متون فقهی کم و بیش مستند احکام قرار گرفته و مورد مناقشه فقهاء و اصولیین می باشد و مشهور معتقند مقتضی و مانع، قاعده نیست بلکه یکی از مسائل ذیل استصحاب است لذا نگارنده بر آن شد تا پیرامون این قاعده پژوهش جامعی انجام دهد. به عقیده ما مقتضی دارای حیثیت مستقلی است و هر گاه می گوییم مقتضی احراز شد یعنی با ماهیت مستقل خودش محرز گشته و قطعا اقتضاء خود را خواهد داشت مانند نکاح که ...
15 صفحه اولthe effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)
cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1941
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/101.8.376