A search for evidence of the neon-sodium cycle in the Cepheid X Cygni

Details A search for evidence of the neon-sodium cycle in the Cepheid X Cygni A search for evidence of the neon-sodium cycle in the Cepheid X Cygni

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984pasp...96..613w&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 96, Aug. 1984, p. 613-617.

Other

12

Cepheid Variables, Sodium, Stellar Activity, Stellar Composition, Abundance, Spectral Line Width

Scientific paper

The authors have determined abundances of sodium, aluminum, silicon, calcium, and iron from 16 red spectra of 10 Å mm-1 of X Cyg to search for a sodium enhancement that might be expected from partial operation of the neon-sodium hydrogen burning cycle. Such burning is possible if the low oxygen and very high nitrogen abundances in X Cyg and other supergiants reported by Luck and Lambert (1981) are correct. The authors find no significant enhancement of sodium indicating that insufficient material that may have burned hydrogen at temperatures in the 30 - 50×106K range has reached the surface.

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