Spectrum synthesis of asymptotic giant branch stars in the Small Magellanic Cloud - A search for envelope burning

Details Spectrum synthesis of asymptotic giant branch stars in the Small Magellanic Cloud - A search for envelope burning Spectrum synthesis of asymptotic giant branch stars in the Small Magellanic Cloud - A search for envelope burning

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.249..538b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 249, April 1, 1991, p. 538-550.

Astronomy and Astrophysics

Astronomy

4

Asymptotic Giant Branch Stars, Magellanic Clouds, Stellar Atmospheres, Stellar Envelopes, Stellar Evolution, Abundance, Carbon, Nitrogen, Oxygen

Scientific paper

The atmospheric abundances of luminous upper AGB stars of the SMC are investigated, searching in particular for evidence of the hypothetical envelope burning process. Synthetic spectra with varying C, N and O abundances selected by considering the effect of the processes of the 3rd dredge up, and a simple-minded recipe for envelope-burning have been computed. The synthetic spectra were compared to observations of a small sample of SMC upper AGB stars thought to be prime candidates for the occurrence of envelope-burning. All of the stars have C/O ratios appropriate for thermally pulsing AGB stars dredging up C. Simple model envelope-burning abundance stars are too N-rich to match the observations, but in some stars the CN bands are stronger than predicted by our C dredge-up spectra. This suggests a smaller N enhancement which could be provided by less effective operation of the envelope-burning process. The relative ZrO band strengths of these stars may also indicate envelope-burning is occurring.

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