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Prog. Theor. Phys. Vol. 30 No. 4 (1963) pp. 460-474

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Evolution of Stars of Small Masses in the Pre-Main-Sequence Stages

Chushiro Hayashi and Takenori Nakano

Department of Nuclear Science, Kyoto University, Kyoto

(Received June 12, 1963)

Abstract:

The structure of the outer envelope with an H-ionization zone and an H2-dissociation zone is investigated for Population I stars of small masses (2M⊙ ≥M ≥0.05M⊙), which have low luminosities (L⊙ ≥L ≥10-3L⊙) and low effective temperatures (6000 °K ≥Te ≥2500 °K), in order to find the surface conduction 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 > 0.26M⊙ but they are wholly convective for 0.26M⊙ ≥M ≥0.08M⊙. The stars less massive than 0.08M⊙ are found to contract toward the configurations of high electron-degeneracy without hydrogen burning.


URL : http://ptp.ipap.jp/link?PTP/30/460/
DOI : 10.1143/PTP.30.460

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Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 36 No. 3 (1966) pp. 504-514 :
    Central Temperature and Density of Stars in Gravitational Equilibrium
    Katsuo Takarada, Humitaka Sato and Chushiro Hayashi
  2. Progress of Theoretical Physics Vol. 43 No. 4 (1970) pp. 942-964 :
    Rapid Contraction of Protostars to the Stage of Quasi-Hydrostatic Equilibrium. III
    Shinji Narita, Takenori Nakano and Chushiro Hayashi
  3. Progress of Theoretical Physics Vol. 60 No. 3 (1978) pp. 699-710 :
    Instability of a Gaseous Envelope Surrounding a Planetary Core and Formation of Giant Planets
    Hiroshi Mizuno, Kiyoshi Nakazawa and Chushiro Hayashi
  4. Progress of Theoretical Physics Supplement No.133 (1999) pp. 233-246 :
    Search for Machos by the MOA Collaboration
    Y. Muraki, T. Sumi, F. Abe, I. Bond, B. Carter, R. Dodd, M. Fujimoto, J. Hearnshaw, M. Honda, J. Jugaku, S. Kabe, Y. Kato, M. Kobayashi, B. Koribalski, P. Kilmartin, K. Masuda, Y. Matsubara, T. Nakamura, S. Noda, G. Pennycook, N. Rattenbury, M. Reid, To. Saito, H. Sato, S. Sato, M. Sekiguchi, D. Sullivan, M. Takeuti, Y. Watase, T. Yanagisawa, P. Yock and M. Yoshizawa

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