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The Pre - Main Sequence

Published online by Cambridge University Press:  12 April 2016

Francesca D’Antona
Francesca D’Antona*
Affiliation:
Osservatorio Astronomico di Roma, Monte Porzio, Italy

Abstract

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The Pre-Main-Sequence (pre-MS) is defined as the phase following the protostellar stage and ending with the ignition of hydrogen in the stellar core. Models in hydrostatic and thermal equilibrium such as typical “Hayashi track” models are basically adequate to describe the internal structure of pre-MS stars, although for a fraction of pre-MS objects there can be phases of accretion also at late stages, which may influence the surface abundances of light elements.

The interior evolution of pre-MS structures is focused in the two main stages’ of Deuterium and Lithium burning for the low mass (M ≤ 1.5M⊙) stars. The location in the HR diagram of theoretical tracks is still subject to large uncertainty, even more apparent today that new opacities and treatment of turbulent convection are available, and the results can be internally compared. Uncertainties amount to a factor ~ two for mass and age determination of individual objects, and affect the absolute location for both the D-burning and the Li-burning regions. Qualitative constraints, such as that there can not be Li-depletion at L ≥ L⊙, remain valid. Abundances of7Li at the surface of pre-MS stars, if measured at a stage which can definitely be considered previous to the possible occurrence of nuclear burning, and, consequently, previous to other depletion mechanism which may occur later on, provide constraints on galactic evolution of this element of cosmological interest.

Type
V. The changing interior
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 395 - 409
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

Adams, F., C., Lada, C.J., Shu, F.H. 1987, ApJ 312, 788.Google Scholar
Alexander, D.R., Augason, G.C., Johnson, H.R. 1989, ApJ 345, 1014.Google Scholar
Barsony, M., Burton, M.G., Russell, A.P.G., Carlstrom, J.E., Garden, R. 1989, ApJ 346, L 93.Google Scholar
Basri, G. Bertout, C. 1989, ApJ 341, 340.Google Scholar
Basri, G., Martin, E.L., Bertout, C. 1991, A&A 252, 625.Google Scholar
Bertout, C. 1989, ARA&A 27, 351.Google Scholar
Bertout, C., Basri, G., Bouvier, J. 1988, ApJ 330, 350.Google Scholar
Bodenheimer, P. 1965, ApJ 142, 451.CrossRefGoogle Scholar
Bodenheimer, P. 1991, In Angular Momentum evolution of Young Stars, Kluwer, eds. Catalano, S. and Stauffer, J.R., p. 1.Google Scholar
Boesgaard, A.M., Steigman, G. 1985, ARA&A 23, 319.Google Scholar
Bouvier, J. 1991, In Angular Momentum evolution of Young Stars, Kluwer, eds. Catalano, S. and Stauffer, J.R., p. 41.CrossRefGoogle Scholar
Böhm Vitense, E. 1958, Zs. für Ap. 46, 108.Google Scholar
Bruston, P., Audouze, J., Vidal-Majar, A., Laurent, C. 1981, ApJ 243, 161.Google Scholar
Canuto, V.M., Mazzitelli, I. 1990, ApJ 370, 295 (CM).Google Scholar
Canuto, V.M., Mazzitelli, I. 1992, ApJ 389, 724.CrossRefGoogle Scholar
Cox, A.N., Tabor, J.E. 1976, ApJS 31, 271.Google Scholar
D’Antona, F., 1991, In Evolutionary Phenomena in the Universe, ed. Compositori, Bologna, SIF Conference Proceedings, 32, 43.Google Scholar
D’Antona, F., Matteucci, F. 1990 A&A 248, 62.Google Scholar
D’Antona, F., Mazzitelli, I. 1984 A&A 138, 431.Google Scholar
D’Antona, F., Mazzitelli, I. 1985 ApJ 296, 502.Google Scholar
D’Antona, F., Mazzitelli, I. 1992, in preparation.Google Scholar
D’Antona, F., Mazzitelli, I., Gratton, R. 1992, A&A, 257, 539.Google Scholar
Däppen, W. 1992, in these Proceedings.Google Scholar
Deliyannis, C.P., Demarque, P. 1991, ApJ 379, 216.Google Scholar
Deliyannis, C.P., Demarque, P., Kawaler, S.D. 1990, ApJS 73, 21.Google Scholar
Deliyannis, C.P., Pinsonneault, M.H. 1990, ApJ 367, L67.Google Scholar
Demarque, P. 1991, In Evolution of Stars: The Photospheric Abundance Connection, eds. Michaud, G. and Tutukov, A., Kluwer, Dordrecht, p. 71.Google Scholar
Endal, A.S., Sofia, S. 1981, ApJ 243, 625.Google Scholar
Garcia Lopez, R.J., Spruit, H.C. 1991, ApJ 377, 268.Google Scholar
Grossman, A.S., Graboske, H.C. Jr. 1973, ApJ 180, 195.Google Scholar
Graboske, H.C. Jr., Olnes, R.J., Grossman, A.S. 1975, ApJ 199, 255.Google Scholar
Hartmann, L.W., Jones, B.F., Stauffer, J.R., Kenyon, S.J. 1991, AJ 101, 1050.Google Scholar
Herbig, G.H., Vrba, F.J., Rydgren, A.E. 1986, AJ 91, 575.Google Scholar
Huebner, W.F., Merts, A. ., Magee, N.H., Argo, M.F. 1977, Los Alamos Scientific Laboratory Report, No LA-6760-M. Google Scholar
Kenyon, S.J., Hartmann, L.W. 1987, ApJ 323, 714.Google Scholar
Kenyon, S.J., Hartmann, L.W. 1990, ApJ 349, 197.Google Scholar
Kurucz, R.L. 1991, in ”Stellar Atmospheres: Beyond the Classical Models”, Crivellali, L., Hubeny, I., Hummer, D.G. eds., NATO ASI Series, Kluwer, Dordrecht.Google Scholar
Larson, R.B. 1969, MNRAS 145, 271.Google Scholar
Lynden-Bell, D., Pringle, J.E. 1974, MNRAS 168,603.Google Scholar
Magazzú, A., Rebolo, R., Pavlenko, Ya. V. 1992, ApJ, in press.Google Scholar
Magni, G., Mazzitelli, I. 1979, A&A 72, 134.Google Scholar
Martin, E.L., Garcia Lopez, R.J., Rebolo, R., Magazzú, A., Pavlenko, Ya.V. 1992, in these proceedings.Google Scholar
Mathews, G.J., Alcock, C.R., Fuller, G.M. 1990 ApJ 349, 449.CrossRefGoogle Scholar
Mazzitelli, I. 1989, In Low Mass Star Formation and Pre-Main Sequence Objects, e. Reipurth, B., ESO Conference Proceedings N. 33, 433.Google Scholar
Mihalas, D., Däppen, W., Hummer, D.G. 1988, ApJ 331, 815.Google Scholar
Mercer-Smith, J.A., Cameron, A.G.W., Epstein, R.I. 1984, ApJ 279, 363.Google Scholar
Montmerle, T., André, P. 1989, In Low Mass Star Formation and Pre-Main Sequence Objects, Reipurth, B. ed., ESO Proceedings N. 33, 407.Google Scholar
Palla, F: 1991, In IAU Symp. 147: Fragmentation of molecular Clouds and Star Formation, ed. Falgarone, E., Kluwer.Google Scholar
Palla, F., Parigi, G. 1992, in these Proceedings.Google Scholar
Palla, F., Stahler, S.W. 1990, ApJ 360, L47.Google Scholar
Palla, F., Stahler, S.W. 1991, ApJ 375, 288.Google Scholar
Palla, F., Stahler, S.W. 1992, ApJ in press.Google Scholar
Pinsonneault, M.H., Kawaler, S., Demarque, , 1990, ApJS 74, 501.CrossRefGoogle Scholar
Pinsonneault, M.H., Deliyannis, C.P., Hobbs, L.M., Thornburn, J.A. 1991, In Cool Stars Workshop, Tucson.Google Scholar
Pinsonneault, M.H., Deliyannis, C.P., Demarque, , 1992a, ApJS 78, 179.Google Scholar
Pinsonneault, M.H., Deliyannis, C.P., Demarque, , 1992b, in these Proceedings.Google Scholar
Pozio, F. 1990, thesis, University of Rome, unpublished.Google Scholar
Pozio, F. 1991, Mem. Soc. Astr. It. 62, 171.Google Scholar
Pringle, J.E. 1989, In Low Mass Star Formation and Pre-Main Sequence Objects, e. Reipurth, B., ESO Conference Proceedings N. 33 p. 89.Google Scholar
Proffitt, C.R., Michaud, G. 1989, ApJ 346, 976.Google Scholar
Proffitt, C.R., Michaud, G., Richer, J. 1990, In “Cool Stars, Stellar Systems and the Sun, ed. Wallerstein, G., (ASP Conference Series 9), p. 35.Google Scholar
Rebolo, R., Martin, E.L., Magazzú, A. ApJ 389, L83.Google Scholar
Ryan, S.G., Norris, J.E., Bessell, M.S., Deliyannis, C.P. 1992, ApJ 388, 184.Google Scholar
Rieke, G.H., Ashok, N.M., Boyle, R.P. 1989, ApJ 339,Google Scholar
Rieke, G.H., Rieke, M.J., Morgan, W.T. 1991, In Astrophysics with Infrared Arrays, ed. Elston, R., ASP Conference Series, p. 244.Google Scholar
Rogers, F.J., Iglesias, C.A. 1992, ApJS 79 (RI).Google Scholar
Saumon, D. 1990, ph.D. Thesis, Rochester University.Google Scholar
Schatzman, E. 1991, In Angular Momentum evolution of Young Stars, Kluwer, eds. Catalano, S. and Stauffer, J.R., p. 223.Google Scholar
Stahler, S.W. 1983, ApJ 274, 822.Google Scholar
Stahler, S.W. 1988, ApJ 332, 804.Google Scholar
Stahler, S.W., Shu, F.H., Taam, R.E. 1980, ApJ 241, 637.Google Scholar
Stahler, S.W., Palla, F. 1990, ApJ 360, L47.Google Scholar
Stevenson, D.J. 1991, ARA&A 29, 163.Google Scholar
Strom, K.M., Strom, S.E., Edwards, , Cabrit, , Skrutskie, 1989a, AJ 97, 1451.CrossRefGoogle Scholar
Strom, K.M., Wilkin, F.P., Strom, S.E., Seamon, R.L. 1989b, AJ 98, 1444.Google Scholar
Swenson, F.J., Stringfellow, G.S., Faulkner, J. 1990, ApJ 348, L33.Google Scholar
York, D.G., Rogerson, J.B. 1976, ApJ 203, 378.Google Scholar
Vandenberg, D.A., Poli, H.E. 1989, AJ 98, 1451.Google Scholar
Vauclair, S. 1988, ApJ 335, 971.Google Scholar
Vidal-Majar, A., Laurent, C., Gry, C., Bruston, P., Ferlet, R., York, D.G. 1983, A&A 120, 58.Google Scholar
Walter, F.M. 1987, PASP 99, 31.Google Scholar
Walter, F.M., Brown, A., Mathieu, R.D., Myers, P.C., Vrba, F.J. 1988, AJ 96, 297.Google Scholar
Zinnecker, H., McCaughrean, M.J., Wilking, B.A. 1992, In Protostars and Planets III, ed. Levy, E.H., Lunine, J.I., Mathews, M.S., (University of Arizona Press: Tucson, Arizona), in press.Google Scholar