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Abundances and Chemical Evolution of the Galactic Center

Published online by Cambridge University Press:  12 April 2016

Jean Audouze
Jean Audouze*
Affiliation:
Radio Astronomy Department Observatoire de Meudon and Laboratoire René Bernas, Orsay – France

Abstract

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From observations of the galactic center using various techniques radioastronomy, millimeter waves (molecules) – infrared and gamma rays, the interstellar matter of this region* appears to have been strongly processed into stars : the gas density is much lower than in the solar neighbourhood. From CO measurements one knows that there are many molecular clouds such as SgrB2 where stars are forming now. From IR measurements, there are some indication that low mass stars are relatively more numerous in such regions than in the external regions of the galaxy. Finally the heavy element abundances show three important features (i) the possibility of strong enhancements in elements such as N and in a less extent 0 and Ne (the so called abundance gradients), (ii) Some specific enhancements of isotopes such 43C, 44N and also 47O relative to 42C, 45N and 43O (iii) Deuterium seems to have a lower abundance than in other parts of the galaxy such as the solar neighbourhood. Simple models of chemical evolution have been designed to account for such features and are rewiewed here.

Type
Part II: Evolution of the Central Parts of the Galaxy
Information
International Astronomical Union Colloquium , Volume 45: Chemical and Dynamical Evolution of our Galaxy , September 1977 , pp. 79 - 101
Copyright
Copyright © Geneva Observatory 1977

References

Aitken, D.K., Griffiths, J., and Jones, B. 1976 M.N.R.A.S. 176, 73p.Google Scholar
Arnett, W.D. 1977 preprintGoogle Scholar
Audouze, J., Lequeux, J. and Vigroux, L. 1975 Astron. Astrophys 43, 71.Google Scholar
Audouze, J., Lequeux, J., Reeves, H. and Vigroux, L. 1976 Ap.J. Letters, 208, L51.CrossRefGoogle Scholar
Audouze, J., Lequeux, J., Rocca-Volmerange, B. and Vigroux, L. 1977 in CNO isotopes in Astrophysics (ed: Audouze, J. – Reidel – Dordrecht) p.155 Google Scholar
Audouze, J. and Tinsley, B.M. 1976 Ann. Rev. Astron. Astrophys. 14, 43 CrossRefGoogle Scholar
Bania, T.M. 1977 Ap.J. 216, 381.Google Scholar
Becklin, E.E. and Neugebauer, G. 1968 Ap.J. 151, 145.Google Scholar
Becklin, E.E. and Neugebauer, G. 1975 Ap.J. Letters, 200, L71.Google Scholar
Burton, W.B. 1976 Ann. Rev. Astron. Astrophys. 14, 275.Google Scholar
Chièze, J.P., Lazareff, B. and Vigroux, L. 1978 in preparation.Google Scholar
Churchwell, E., Walmsey, C.M. and Winnewisser, G. 1977 Astron. Astrophys. 54, 925.Google Scholar
Downes, D. 1974 Proc. 8th ESLAB Symposium (Moorwood, A.F.M. ed. ESR0-SP105-November 1974) p247.Google Scholar
Downes, D., Maxwell, A. and Meeks, M.L. 1965 Nature 208, 1189.Google Scholar
Ekers, R.D., Goss, W.M., Schwarz, U.J., Downes, D. and Rogstadt, D.H. 1975 Astron. Astrophys. 43, 159.Google Scholar
Fitchel, C.H., Hartmann, R.C., Kniffen, D.A., Thompson, D.J., Bignami, G.F., Ögelman, H., Özel, M.E. and Türner, T. 1975 Ap.J. 198, 163.Google Scholar
Gatley, L., Becklin, E.E., Werner, M.W., and Wynn-Williams, C.G. 1977 Ap.J. 216, 277.CrossRefGoogle Scholar
Guibert, J., Lequeux, J., Viallefond, F. 1977 to be published.Google Scholar
Haymes, R.C., Walraven, G.D., Meegan, C.A., Hall, R.D., Djuth, F.T. and Shelton, D.H. 1975, Ap.J. 201, 593.Google Scholar
Hoffmann, W.F., Frederick, C.L. and Emery, R.J. 1971 Ap.J. Letters, 164, L23.Google Scholar
Iben, I Jr. and Truran, J.W. 1977 preprint.Google Scholar
Kellermann, K.I., Shaffer, D.B., Clark, B.G. and Geldzahler, B.J. 1977 Ap.J. Letters, 214, L61.Google Scholar
Lazareff, B., Audouze, J., Starrfield, S. and Truran, J.W. 1978 Ap.J. (submitted to publication)Google Scholar
Linke, R.A., Goldsmith, P.F., Wannier, P.G., Wilson, R.W. and Penzias, A.A. 1977 Ap.J. 214, 50.Google Scholar
Lo, K.Y., Schilizzi, R.T., Cohen, M.H., and Ross, H.N., Ap.J. Letters, 202, L63.CrossRefGoogle Scholar
Meneguzzi, M., Audouze, J. and Reeves, H. 1971 Astron. Astrophys. 20, 91.Google Scholar
Meyer, J.P. 1974 unpublished doctoral thesis, Université de Paris-Sud, Orsay.Google Scholar
Mezger, P.G. 1974 in Conference on Research programmes for the new large telescope Reiz, A. ed. ESO/SRC/CERN 1974 p.79.Google Scholar
Mezger, P.G. and Smith, L.F. 1976 Astron. Astrophys. 47, 143.Google Scholar
Neugebauer, G., Becklin, E.E., Beckwith, S., Mathews, K., and Wynn-Williams, C.G. 197 Ap.J. Letters. 205, L135.Google Scholar
Oort, J.H. Ann. Rev. Astron. Astrophys. 1977, 15, 295.CrossRefGoogle Scholar
Pauls, T., Mezger, P.G. and Churchwell, E. 1974 Astron. Astrophys., 34, 327.Google Scholar
Penzias, A.A., Wannier, P.G. Wilson, R.W., and Linke, R.A. 1977 Ap.J. 211, 108.Google Scholar
Puget, J.L. 1977 private communicationGoogle Scholar
Sanders, R.H., Wrixon, G.T., 1975, Astron. Astrophys. 26, 365.Google Scholar
Scoville, N.Z., Solomon, P.M., Jefferts, K.B. 1974 Ap.J. Letters. 187, L63.CrossRefGoogle Scholar
Starrfield, S., Truran, J.W., Sparks, W.M. and Kutter, G.S. 1972 Ap.J. 176, 169.Google Scholar
Talbot, R.J. and Arnett, W.D. 1973 Ap.J. 186, 69.Google Scholar
Thaddeus, P. 1977 in Star Formation (de Jong, T and Maeder, A ed., Reidel) to be published.Google Scholar
Vigroux, L., Audouze, J. and Lequeux, J. 1976 Astron. Astrophys. 52, 1.Google Scholar
Wannier, P.G., Lucas, R., Linke, R.A., Encrenaz, P.J., Penzias, A.A. and Wilson, R.W. 1976 Ap.J. Letters. 205, L169.CrossRefGoogle Scholar
Wannier, P.G., Penzias, A.A., Linke, R.A. and Wilson, R.W. 1976 Ap.J. 204, 26.Google Scholar
Wilson, R.W., Penzias, A.A., Wannier, P.G. and Linke, R.A. 1976 Ap.J. Letters204, L135.Google Scholar
Wolfendale, A.W. and Worrall, D.M. 1976 Nature 263, 482.Google Scholar
Wollman, E.R. 1976 unpublished PhD Thesis University of California BerteleyGoogle Scholar
Wollman, E.R., Geballe, T.R., Cacy, J.H., Townes, C.H. and Rank, D.M. 1976 Ap.J. Letters, 205, L5.Google Scholar
Zuckerman, B. 1977 Nature 268, 491.CrossRefGoogle Scholar