Astrophysics and Space Science

, Volume 45, Issue 2, pp 353–367 | Cite as

Unified formation of astronomical objects up to stellar mass range

  • GP. Horedt


In dense interstellar clouds or in the surroundings of just-formed stars, the larger grains form proto-cores by segregating from the gas under the influence of the gravitational field of the cloud during intervals of the order 108 yr.

If the mass of the proto-cores is smaller than a certain limit, the object possesses a negligible atmosphere and remains composed mainly of solid grain material. If the mass of the proto-core exceeds the limiting mass, the proto-core can bind around it an atmosphere. When the temperature of the opaque part of the atmosphere is only fractions of a degree above the temperature of the surrounding tenuous gas, gravitational contraction of the opaque part of the atmosphere sets in, forming gaseous objects up to stellar mass range.

Binary and multiple systems originate from neighbouring proto-cores, through gravitational contraction of both their separate and common outer atmospheres.

Pycnonuclear reactions are not able to prevent a star with mass ≲0.08M from cooling to the black dwarf stadium.


Atmosphere Mass Range Gravitational Field Unify Formation Stellar Mass 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. Aannestad, P. A. and Purcell, E. M.: 1973,Ann. Rev. Astr. Astrophys. 11, 309.Google Scholar
  2. Alfvén, H. and Arrhenius, G.: 1970,Astrophys. Space Sci. 8, 338;9, 3.Google Scholar
  3. Arny, Th.: 1971,Astrophys. J. 169, 289.Google Scholar
  4. Bodenheimer, P.: 1972,Rep. Prog. Phys. 35, 1.Google Scholar
  5. Cameron, A. G. W.: 1959,Astrophys. J. 130, 916.Google Scholar
  6. Cameron, A. G. W.: 1973,Icarus 18, 407.Google Scholar
  7. Castellani, V. and Panagia, N.: 1972,Astrophys. Space Sci. 15, 462.Google Scholar
  8. Chandrasekhar, S.: 1939,An Introduction to the Study of Stellar Structures, Chicago University Press.Google Scholar
  9. Cox, J. P. and Giuli, T.: 1968,Principles of Stellar Structure, Gordon and Breach, New York.Google Scholar
  10. Donnison, J. R. and Williams, I. P.: 1974,Astrophys. Space Sci. 29, 387.Google Scholar
  11. Field, G. B.: 1970,Mém. Soc. Roy. Sci. Liège, 5 sér.19, 29.Google Scholar
  12. Graboske, H. C. Jr., Pollack, J. B., Grossman, A. S., and Olness, R. J.: 1973, L. Livermore Lab. preprint, UCRL 74860.Google Scholar
  13. Greenberg, J. M. and Jong, T. de: 1969,Nature 224, 251.Google Scholar
  14. Greenberg, J. M.: 1974,Astrophys. J. Letters 189, L81.Google Scholar
  15. Hartmann, W. K.: 1970,Mém. Soc. Roy. Sci. Liège, 5 sér.19, 215.Google Scholar
  16. Horedt, Gp.: 1970,Monthly Notices Roy. Astron. Soc. 151, 81.Google Scholar
  17. Horedt, Gp.: 1972,Astrophys. Space Sci. 15, 129.Google Scholar
  18. Horedt, Gp.: 1973a,Astron. Astrophys. 23, 303.Google Scholar
  19. Horedt, Gp.: 1973b,Monthly Notices Roy. Astron. Soc. 163, 285.Google Scholar
  20. Horedt, Gp.: 1974,Bull. Astr. Inst. Czech. 25, 251.Google Scholar
  21. Isobe, S.: 1972,Publ. Astr. Soc. Jap. 24, 27.Google Scholar
  22. Jong, T. de and Kamijo, F.: 1973,Astron. Astrophys. 25, 263.Google Scholar
  23. Kruszewski, A.: 1966, in Z. Kopal (ed.),Adv. Astr. Astrophys. 4, 233, Academic Press, New York.Google Scholar
  24. Kumar, S. S.: 1972,Astrophys. Space Sci. 17, 453.Google Scholar
  25. Kumar, S. S.: 1974,Astrophys. Space Sci. 28, 173.Google Scholar
  26. Kusaka, T., Nakano, T., and Hayashi, C.: 1970,Prog. Theor. Phys. 44, 1580.Google Scholar
  27. Larson, R. B.: 1972,Monthly Notices Roy. Astron. Soc. 157, 121.Google Scholar
  28. Larson, R. B.: 1973,Monthly Notices Roy. Astron. Soc. 161, 133.Google Scholar
  29. Lebovitz, N.: 1972,Astrophys. J. 175, 171.Google Scholar
  30. MacDonald, G. J. F.: 1959,J. Geophys. Res. 64, 1967.Google Scholar
  31. McCrea, W. H.: 1957,Monthly Notices Roy. Astron. Soc. 117, 562.Google Scholar
  32. McCrea, W. H. and Williams, I. P.: 1965,Proc. Roy. Soc. A287, 143.Google Scholar
  33. Menzel, D., Bhatnagar, P. L., and Sen, H. K.: 1963,Stellar Interiors, Chapman and Hall, London.Google Scholar
  34. Mestel, L.: 1970,Mém. Soc. roy. Sci. Liège 5 sér.19, 167.Google Scholar
  35. Mészáros, P.: 1972,Astrophys. J. 177, 79.Google Scholar
  36. Milne, E. A.: 1930,Handbuch der Astrophysik, Vol. III, Part I, p. 196, Springer.Google Scholar
  37. Nakano, T.: 1973,Publ. Astr. Soc. Jap. 25, 91.Google Scholar
  38. Narita, S., Nakano, T., and Hayashi, C.: 1970,Prog. Theor. Phys. 43, 942.Google Scholar
  39. Öpik, E. J.: 1973,Astrophys. Space Sci. 21, 307.Google Scholar
  40. Reddish, V. C.: 1965,Vistas in Astronomy 7, 173.Google Scholar
  41. Schwarzschild, M.: 1958,Structure and Evolution of Stars, Princeton Univ. Press.Google Scholar
  42. Viala, Y. P. and Horedt, Gp.: 1974a,Astron. Astrophys. 33, 195.Google Scholar
  43. Viala, Y. P. and Horedt, Gp.: 1974b,Astron. Astrophys. Suppl. 16, 173.Google Scholar
  44. Wesson, P. S.: 1973,Astrophys. Space Sci. 23, 227.Google Scholar
  45. Wickramasinghe, N. C. and Reddish, V. C.: 1968,Nature 218, 661.Google Scholar
  46. Wildhack, W. A.: 1940,Phys. Rev. 57, 81.Google Scholar
  47. Williams, I. P. and Crampin, D. J.: 1971,Monthly Notices Roy. Astron. Soc. 152, 261.Google Scholar
  48. Wolf, R. A.: 1965,Phys. Rev. B137, 1634.Google Scholar
  49. Zeldovich, Ya. B.: 1957,Zh. Exp. Theor. Phys. 33, 991.Google Scholar

Copyright information

© D. Reidel Publishing Company 1976

Authors and Affiliations

  • GP. Horedt
    • 1
  1. 1.Centre for Theoretical PhysicsUniversitatea ClujRomania

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