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He abundance in red giants

Published online by Cambridge University Press:  07 August 2017

J.A. de Freitas Pacheco  and
R.D.D. Costa
J.A. de Freitas Pacheco
Affiliation:
Instituto Astronômico e Geofísico, Universidade de SÃo Paulo, Brazil
R.D.D. Costa
Affiliation:
Instituto Astronômico e Geofísico, Universidade de SÃo Paulo, Brazil

Abstract

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The He abundance in red giants is not well known. Moreover, some He enhancement in the stellar atmospheres is expected to occur as a consequence of distinct dredge-up episodes. In the present work is reported and discussed the He abundance for 5 symbiotic nebulae (Hen 2-38, RR Tel, RX Pup, HM Sge, KX TrA). Self-absorption effects in both hydrogen and HeI lines were taken into account.

Keywords

Symbiotic starsChemical abundances
Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 149: The Stellar populations of Galaxies , 1992 , pp. 418
Copyright
Copyright © Kluwer 

References

Almog, Y. and Netzer, H. (1989) Mon. Not. R. astr. Soc. 238, 57.Google Scholar
De Freitas Pacheco, J.A. and Costa, R.D.D. (1991a) - submitted to publication.Google Scholar
Netzer, H. (1975) Mon. Not. R. astr. Soc. 171, 395.CrossRefGoogle Scholar