The formation of cool stars from cloud cores

  • Frank H. Shu
  • Susan Terebey
1. Pre-Main Sequence Star
Part of the Lecture Notes in Physics book series (LNP, volume 193)


We consider models of the processes by which a molecular cloud acquires dense cores, a (magnetized) rotating core collapses to give a protostar plus nebular disk, and a powerful stellar wind sets in to reverse the accretion flow and reveal the central object as a pre-main-sequence star. At each stage, we rely on a combination of theory and observation to fix the basic parameters of the model. We show that core formation in a molecular cloud is an inevitable byproduct of ambipolar diffusion in a magnetized self-gravitating medium of low fractional ionization. We find that the gravitational collapse of a uniformly-rotating isothermal core, which possesses a 1/r2 density profile in its inner parts, has simple analytic properties. And we propose that strong stellar winds in T Tauri stars represent a phase of readjustment in the angular momentum distribution after deuterium burning drives convection throughout a strongly differentially-rotating protostar. We conclude that the major missing link in this picture is the evolutionary behavior of massive nebular disks that may accumulate around protostars. Otherwise, there seems to be a satisfying connection between the cloud cores observed by molecular-line radio astronomers and the active stellar atmospheres of young stars studied by optical and x-ray astronomers.


Accretion Rate Molecular Cloud Ambipolar Diffusion Tauri Star Accretion Flow 


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  1. Allen, M. A., and Robinson, G. W. 1976, Ap. J., 297, 745.CrossRefGoogle Scholar
  2. Appenzeller, I., and Tscharnuter, W. 1975, Astr. Ap., 40, 397.Google Scholar
  3. Bally, J., and Lads, C. J. 1983, Ap. J., 265, 824.CrossRefGoogle Scholar
  4. Black, D. C., and Scott, E. H. 1982, Ap. J., 263, 696.Google Scholar
  5. Blitz, L. 1980, in Giant Molecular Clouds in the Galaxy, ed. P. M. Solomon and M. G. Edwards (Oxford: Pergamon Press), p. 1.Google Scholar
  6. Bodenheimer, P. 1981, in IAU Symp. No. 91, Fundamental Problems in the Theory of Stellar Evolution, ed. D. Sugimoto, D. Q. Lamb, and D. N. Schramm (Dordrecht: Reidel), p. 5.Google Scholar
  7. Boss, A. P., and Black, D. C. 1982, Ap. J., 258, 270.Google Scholar
  8. Cassen, P., and Moosman, A. 1981, Icarus, 48, 353.Google Scholar
  9. Cassen, P., and Summers, A. 1983, Icarus, 53, 26.Google Scholar
  10. Chandrasekhar, S. 1939, An Introduction to the Study of Stellar Structure (Univ. of Chicago Press).Google Scholar
  11. Cohen, M., and Kuhi, L. V. 1979, Ap. J. Suppl., 41, 743.Google Scholar
  12. Draine, B. T., Roberge, W. G., and Dalgarno, A. 1983, Ap. J., 264, 485.Google Scholar
  13. Elmegreen, B. G. 1979, Ap. J., 232, 729.Google Scholar
  14. Evans, N. J. 1978, in Protostars and Planets, ed. T. Gehrels (Tucson: Univ. Ariz. Press), p. 158.Google Scholar
  15. Fricke, K. 1967, Z. f. Ap., 68, 317.Google Scholar
  16. Goldreich, P., and Schubert, G. 1967, Ap. J., 150, 571.Google Scholar
  17. Hayashi, C., Hoshi, R., and Sugimoto, D. 1962, Prog. Theor. Phys. Suppl., No. 23.Google Scholar
  18. Herbig, G. 1962, Adv. Astr. Ap., 1, 47.Google Scholar
  19. Ho, P. T. P., Martin, R. N., Myers, P. C., and Barrett, A. H. 1977, Ap. J. Lett., 215, L29.Google Scholar
  20. Ho, P. T. P., and Townes, C. H. 1983, Ann. Rev. Astr. App., 215, 239.Google Scholar
  21. Hunter, C. 1977, Ap. J., 213, 497.Google Scholar
  22. Kuhi, L. V. 1964, Ap. J., 140, 409.Google Scholar
  23. Kutner, M. L., Tucker, K. D., Chin, G., and Thaddeus, P. 1977, Ap. J., 215, 521.Google Scholar
  24. Larson, R. B. 1969, MNRAS, 145, 271.Google Scholar
  25. Larson, R. B. 1981, MNRAS, 194, 809.Google Scholar
  26. Loren, R. B., Sandqvist, Aa., and Wooten, A. 1983, Ap. J., 270, 620.Google Scholar
  27. Mercer-Smith, J. A., Cameron, A. G. W., and Epstein, R. I. 1983, preprint.Google Scholar
  28. Mestel, L. 1965, Quart. J. R. A. S., 6, 265.Google Scholar
  29. Mestel, L., and Spitzer, L. 1956, MNRAS, 116, 503.Google Scholar
  30. Mouschovias, T. Ch. 1976, Ap. J., 207, 141.Google Scholar
  31. Mouschovias, T. Ch. 1981, in IAU Symp. No. 91, Fundamental Problems in the Theory of Stellar Evolution, ed. D. Sugimoto, D. Q. Lamb, and D. N. Schramm (Dordrecht: Reidel), p. 27.Google Scholar
  32. Mouschovias, T. Ch., and Paleologou, E. V. 1980, Ap. J., 237, 877.Google Scholar
  33. Myers, P. C., and Benson, P. J. 1983, Ap. J., 266, 309.CrossRefGoogle Scholar
  34. Nakano, T. 1981, Prog. Theor. Phys. Suppl., No. 70, 54.Google Scholar
  35. Ostriker, J. P., and Bodenheimer, P. 1973, Ap. J., 180, 171.Google Scholar
  36. Rowan-Robinson, M. 1979, Ap. J., 234, 111.Google Scholar
  37. Sargent, A. I. 1977, Ap. J., 218, 736.Google Scholar
  38. Schneps, M. H., Martin, R. N., Ho, P. T. P., and Barrett, A. H. 1978, Ap. J., 221, 124.Google Scholar
  39. Shu, F. H. 1977, Ap. J., 214, 488.Google Scholar
  40. Shu, F. H. 1983, Ap. J., 273, 202.Google Scholar
  41. Solomon, P. M., and Sanders, D. B. 1980, in Giant Molecular Clouds in the Galaxy, ed. P. M. Solomon and M. G. Edwards (Oxford: Pergamon Press), p. 41.Google Scholar
  42. Spitzer, L. 1942, Ap. J., 95, 329.Google Scholar
  43. Stahler, S. 1983a, preprint.Google Scholar
  44. Stahler, S. 1983b, preprint.Google Scholar
  45. Stahler, S. W., Shu, F. H., and Taam, R. E. 1980a, Ap. J., 241, 637; 1980b, Ap. J., 242, 226; 1981, Ap. J., 248, 727 (SST).Google Scholar
  46. Strom, S. 1983, preprint.Google Scholar
  47. Terebey, S., Shu, F. H., and Cassen, P. 1983, in preparation (TSC).Google Scholar
  48. Ulrich, R. K. 1976, Ap. J., 210, 377.Google Scholar
  49. Umebayashi, T., and Nakano, T. 1980, Pub. Astr, Soc. Japan, 32, 405.Google Scholar
  50. Vogel, S. N., and Kuhi, L. V. 1981, Ap. J., 245, 960.Google Scholar
  51. Winkler, K.-H., and Newman, M. J., 1980a, Ap. J., 236, 201; 1980b, Ap. J., 238, 311.Google Scholar

Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • Frank H. Shu
    • 1
  • Susan Terebey
    • 1
  1. 1.Astronomy DepartmentUniversity of CaliforniaBerkeleyUSA

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