Evolution of Stars of Small Masses in the Pre-Main-Sequence Stages
Evolution of Stars of Small Masses in the Pre-Main-Sequence Stages
复制标题
前主序阶段小质量恒星的演化
DOI：
10.1143/ptp.30.460
复制
发表时间：
1963
影响因子：
--
通讯作者：
T. Nakano
中科院分区：
文献类型：
--
作者：
C. Hayashi;T. Nakano
The structure of the outer envelope with an H-ii:mization zone and an H 2-dissociation zone is investigated for Population I stars of small masses (2M02:M>0.05M(!)), which have low luminosities (L02:L2:10-3L0) and low effective temperatures (6000 'K2:T.2:2500 'K), in order to find the surface condition for the internal structure of these stars. The effective temperature of a star which is wholly convective and which has an H2-dissociation zone is found to be nearly constant in the wide range of its luminosity. Using stellar models composed of a radiative core and a convective envelope together with the above surface condition, the evolution of contracting stars is calculated up to the onset of hydrogen burning and the results are compared with the observed red dwarf stars. It is found that the stars on the zero-age main-sequence have radiative cores for M>0.26M0 but they are wholly convective for 0.26M02:M2:0.0BM0. The stars less massive than 0.08M0 are found to contract toward the configurations of high electron-degeneracy without hydrogen burning.
