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The Magellanic Clouds and the Primordial Helium Abundance

Published online by Cambridge University Press:  25 May 2016

Manuel Peimbert  and
Antonio Peimbert
Manuel Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autonoma de México. Apdo. Postal 70-264, Mexico, D.F. 04510
Antonio Peimbert
Affiliation:
Instituto de Astronomía, Universidad Nacional Autonoma de México. Apdo. Postal 70-264, Mexico, D.F. 04510

Abstract

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A new determination of the pregalactic helium abundance based on the Magellanic Clouds H II regions is discussed. This determination amounts to Yp = 0.2345 ± 0.0030 and is compared with those derived from giant extragalactic H II regions in systems with extremely low heavy elements content. It is suggested that the higher primordial value derived by other authors from giant H II region complexes could be due to two systematic effects: the presence of neutral hydrogen inside the helium Strömgren sphere and the presence of temperature variations inside the observed volume.

Type
3. Abundances of D, 3He and 4He
Information
Symposium - International Astronomical Union , Volume 198: The Light Elements and their Evolution , 2000 , pp. 194 - 203
Copyright
Copyright © Astronomical Society of the Pacific 2000 

References

Armour, M. H., Ballantyne, D. R., Ferland, G. F., Karr, J., & Martin, P.G. 1999, PASP, 111, 1251 Google Scholar
Benjamin, R. A., Skillman, E. D., & Smits, D. P. 1999, ApJ, 514, 307 Google Scholar
Burles, S., & Tytler, D. 1998, ApJ, 507, 732 Google Scholar
Carigi, L. 2000, ApJ, submitted Google Scholar
Carigi, L., Colín, P., Peimbert, M., & Sarmiento, A. 1995, ApJ, 445, 98 Google Scholar
Carigi, L., Colín, P., & Peimbert, M. 1999, ApJ, 514, 787 Google Scholar
Chiappini, C., Matteucci, F., & Gratton, R. 1997, ApJ, 477, 765 Google Scholar
Copi, C. J., Schramm, D. N., & Turner, M. S. 1995, Science, 267, 192 CrossRefGoogle Scholar
Esteban, C., Peimbert, M., Torres-Peimbert, S., & Escalante, V. 1998, MNRAS, 295, 401 Google Scholar
Esteban, C., Peimbert, M., Torres-Peimbert, S., & García-Rojas, J. 1999, Rev Mex AA, 35, 85 Google Scholar
Ferland, G. J. 1996, Hazy, a Brief Introduction to CLOUDY, Univ. of Kentucky Dept. of Phys. & Astron. Internal Report Google Scholar
Fields, B. D., & Olive, K. A. 1998, ApJ, 506, 177 Google Scholar
Fukugita, M., Hogan, C. J., & Peebles, P. J. E. 1998, ApJ, 503, 518 Google Scholar
Izotov, Y. I., Chaffee, F. H., Foltz, C. B., Green, R. F., Guseva, N. G., & Thuan, T. X. 1999, ApJ, 527, 757 Google Scholar
Izotov, Y. I., & Thuan, T. X. 1998, ApJ, 500, 188 Google Scholar
Izotov, Y. I., Thuan, T. X., & Lipovetsky, V. A. 1994, ApJ, 435, 647 Google Scholar
Izotov, Y. I., Thuan, T. X., & Lipovetsky, V. A. 1997, ApJS, 108, 1 Google Scholar
Luridiana, V., Peimbert, M., & Leitherer, C. 1999, ApJ, 527, 110 Google Scholar
Maeder, A. 1992, A&A, 264, 105 Google Scholar
Massey, P., Parker, J. W., & Garmany, C. D. 1989, AJ, 98, 1305 Google Scholar
Pagel, B. E. J., Simonson, E. A., Terlevich, R. J., & Edmonds, M. G. 1992, MNRAS, 255, 325 Google Scholar
Peimbert, A., Peimbert, M., & Luridiana, V. 2000b, Rev Mex AA, submitted Peimbert, M. 1967, ApJ, 150, 825 Google Scholar
Peimbert, M. 1995, in The Analysis of Emission Lines., ed. Williams, R.E. & Livio, M. (Cambridge University Press), p. 165 Google Scholar
Peimbert, M., Peimbert, A., & Ruiz, M.T. 2000a, ApJ, submitted Google Scholar
Peimbert, M., & Torres-Peimbert, S. 1999, ApJ, 525 (Part 3), 1143 Google Scholar
Peimbert, M., Torres-Peimbert, S., & Ruiz, M.T. 1992, Rev Mex AA, 24, 155 Google Scholar
Robbins, R. R. 1968, ApJ, 151, 511 Google Scholar
Shields, G. A. 1974, ApJ, 191, 309 Google Scholar
Stasinska, G., & Schaerer, D. 1999, A&A, 351, 72 Google Scholar
Vílchez, J. M., & Pagel, B. E. J. 1988, MNRAS, 231, 257 Google Scholar
Woosley, S. E., Langer, N., & Weaver, T. A. 1993, ApJ, 411, 823 Google Scholar
Woosley, S. E., & Weaver, T. A. 1995, ApJS, 101, 181 Google Scholar