Why Do the Main Sequence Stars Have Similar Chemical Composition?
Why Do the Main Sequence Stars Have Similar Chemical Composition?作者机构：Institute of Physics Maria Curie-Sklodowska University Lublin Poland Los Alamos National Laboratory MPA-CMMS Group Los Alamos USA
出 版 物：《International Journal of Astronomy and Astrophysics》 (天文学与天体物理学国际期刊（英文）)
年 卷 期：2012年第2卷第1期
页 面：37-38页
主 题：Stars Quasars Background Radiation Jeans Criterion Gravitational Contraction Nebulae
摘 要：In this short note we have reconsidered the Jeans criterion for gravitational contraction of a gas nebula at different temperatures, from the present-day background radiation temperature (2.8 K) to those which existed at the early stage of the Universe. We demonstrate that the initial mass of quasars cannot be of the order of single galaxy masses, but rather 106 solar mass only. If they have larger masses, it must be the result of subsequent accretion process. Nevertheless quasars, formed prior to the stars, were the immediate source of the elements heavier than helium.
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