Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...221..893c&link_type=abstract
Astrophysical Journal, Part 1, vol. 221, May 1, 1978, p. 893-906.
Astronomy and Astrophysics
Astrophysics
79
Abundance, Late Stars, Line Spectra, Nuclear Fusion, Stellar Spectra, Stellar Spectrophotometry, Emission Spectra, Globular Clusters, Helium, Hydrogen, Spectral Bands, Stellar Atmospheres
Scientific paper
Spectroscopic and photometric observations of the weak-G-band star HD 91805 are examined together with intermediate-band photometry of several Bidelman-MacConnell objects. Curve-of-growth and spectrum-synthesis analyses of HD 91805 are performed to obtain insight into the products of mixing; the results are found to be very similar to those reported by Sneden and Peterson (1977) for HR 6766. Evidence based on the intermediate-band photometry is presented that the majority of the Bidelman-MacConnell weak-G-band stars are burning helium in their cores subsequent to the helium core flash. Possible causes of the weak-G-band anomaly are considered, and it is concluded that carbon depletion due to meridional circulation requires the least radical departure from now well-understood astrophysical processes.
Cottrell Peter L.
Norris Jackson
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