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Some aspects of the chemical evolution of 4He in the Galaxy: the He/H radial gradient and the ΔY/ΔZ enrichment ratio

Published online by Cambridge University Press:  25 May 2016

W. J. Maciel
W. J. Maciel*
Affiliation:
IAG/USP - Av. Miguel Stefano 4200 - CEP 04301-904 Sao Paulo SP, Brazil

Abstract

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Two aspects of the chemical evolution of 4He in the Galaxy are considered on the basis of a sample of disk planetary nebulae by the application of corrections due to the contamination of 4He from the progenitor stars. First, the He/H radial gradient is analyzed, and then, the helium to heavy element enrichment ratio is determined for metallicities up to the solar value.

Type
3. Abundances of D, 3He and 4He
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 204 - 213
Copyright
Copyright © Astronomical Society of the Pacific 2000 

References

Allen, C., Carigi, L., & Peimbert, M. 1998, ApJ, 494, 247 Google Scholar
Amnuel, P.R. 1993, MNRAS, 261, 263 CrossRefGoogle Scholar
Boothroyd, A.I., & Sackmann, I.-J. 1999, ApJ, 510, 232 Google Scholar
Cazetta, J.O., & Maciel, W.J. 2000, Rev. Mex. Astron. Astrofis., in press Google Scholar
Chiappini, C., Maciel, W.J., 1994 A&A, 288, 921 Google Scholar
Chiappini, C., Matteucci, F., & Gratton, R. 1997, ApJ, 477, 765 Google Scholar
D'Odorico, S., Peimbert, M., & Sabbadin, F. 1976, A&A, 47, 341 Google Scholar
Esteban, C., & Peimbert, M. 1995, Rev. Mex. Astron. Astrofis. SC, 3, 133 Google Scholar
Esteban, C., Peimbert, M., Torres-Peimbert, S., & Garcia-Rojas, J. 1999, Rev. Mex. Astron. Astrofis., 35, 65 Google Scholar
Faúndez-Abans, M., & Maciel, W.J. 1986, A&A, 158, 228 Google Scholar
Grevesse, N., & Sauval, A.J. 1998, Space Sci. Rev., 85, 161 Google Scholar
Izotov, Y.I., Thuan, T.X., & Lipovetsky, V.A. 1997, ApJS, 108, 1 Google Scholar
Izotov, Y.I., Chaffee, F.H., Foltz, C.B., Green, R.F., Guseva, N.G., & Thuan, T.X. 1999, ApJ, in press Google Scholar
Maciel, W.J. 1988, A&A, 200, 178 Google Scholar
Maciel, W.J. 1997, in IAU Symp. 180, ed. Habing, H.J. & Lamers, H.J.G.L.M. (Dordrecht: Kluwer), 397 Google Scholar
Maciel, W.J. 2000, A&A, submitted Google Scholar
Maciel, W.J., & Cazetta, J.O. 1997, Ap&SS, 249, 341 Google Scholar
Maciel, W.J., & Chiappini, C. 1994, Ap&SS, 219, 231 Google Scholar
Maciel, W.J., & Quireza, C. 1999, A&A, 345, 629 Google Scholar
Maciel, W.J., & Rocha-Pinto, H.J. 1998, MNRAS, 299, 889 Google Scholar
Méndez, R.H., Kudritzki, R.P., Herrero, A., Husfeld, D., & Groth, H.G. 1988, A&A, 190, 113 Google Scholar
Méndez, R.H., Kudritzki, R.P., & Herrero, A. 1992, A&A, 260, 329 Google Scholar
Olive, K.A., Steigman, G., & Walker, T.P. 1999, Phys. Rep., in press Google Scholar
Padoan, P., Nordlund, Å., & Jones, B.J.T. 1997, MNRAS, 288, 145 CrossRefGoogle Scholar
Pagel, B.E.J., & Portinari, L. 1998, MNRAS, 298, 747 Google Scholar
Pagel, B.E.J., Simonson, E.A., Terlevich, R.J., & Edmunds, M.C. 1992, MNRAS, 255, 325 Google Scholar
Pasquali, A., & Perinotto, M. 1993, A&A, 280, 581 Google Scholar
Peimbert, M. 1978, in IAU Symp. 76, ed. Terzian, Y. (Dordrecht: Reidel), 215 Google Scholar
Peimbert, M. 1990, Rep. Prog. Phys., 53, 1559 Google Scholar
Peimbert, M., & Serrano, A. 1980, Rev. Mex. Astron. Astrofis., 5, 9 Google Scholar
Peimbert, M., & Torres-Peimbert, S. 1974, ApJ, 193, 327 Google Scholar
Peimbert, M., & Torres-Peimbert, S. 1976, ApJ, 203, 581 CrossRefGoogle Scholar
Shaver, P.A., McGee, R.X., Newton, L.M., Danks, A.C., & Pottasch, S.R. 1983, MNRAS, 204, 53 CrossRefGoogle Scholar
Rocha-Pinto, H.J., Scalo, J., Maciel, W.J., & Flynn, C. 2000, ApJ, in press Google Scholar
Stasinska, G., Gorny, S.K., & Tylenda, R. 1997, A&A, 327, 736 Google Scholar
Thuan, T.X., & Izotov, Y.I. 1998, Space Sci. Rev., 84, 83 Google Scholar
van den Hoek, L.B., & Groenewegen, M.A.T. 1997, A&AS, 123, 305 Google Scholar