Chemical abundances in symbiotic nebulae

Details Chemical abundances in symbiotic nebulae Chemical abundances in symbiotic nebulae

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..619d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 619-626.

Astronomy and Astrophysics

Astrophysics

24

Abundance, Nebulae, Red Giant Stars, Stellar Composition, Symbiotic Stars, Balmer Series, Helium, Hydrogen, Interstellar Extinction

Scientific paper

We report new optical data on five symbiotic systems: AS 210, He2-38, RX Pup, RR Tel and HM Sge. Assuming that the wind of the red giant ionized by a hot source constitutes the emitting region, we have derived its chemical composition. Optical depth effects in both hydrogen and He I lines were taken into account. The resulting He abundances reveal that they are similar to those observed in planetary nebulae. Moreover, the helium abundance correlates with the N/O ratio, according to the expectations from contamination by dredge-up episodes.

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