A SEARCH FOR EVIDENCE OF THE NEON-SODIUM CYCLE IN THE CEPHEID X CYGNI

• Published in: Publications of the Astronomical Society of the Pacific Vol. 96; no. 582; pp. 613 - 617
• Main Authors: WALLERSTEIN, GEORGE, PILACHOWSKI, CATHERINE A., HARRIS, HUGH C.
• Format: Journal Article
• Language: English
• Published: The Astronomical Society of the Pacific 01.08.1984
• Subjects: Aluminum; Astrophysics; Calcium; Cepheids; Neon; Nitrogen; Oxygen; Silicon; Sodium; Stars

We 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...