Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..66..201c&link_type=abstract
Astrophysics and Space Science, vol. 66, no. 1, Nov. 1979, p. 201-209. Research supported by the Financiadora de Estudos e Proj
Astronomy and Astrophysics
Astrophysics
17
Abundance, Helium, Metals, Open Clusters, Red Giant Stars, Stellar Mass Ejection, Astronomical Catalogs, Electrophotometry, Globular Clusters, Hydrogen, Iron, Mass Ratios, Stellar Evolution
Scientific paper
Interstellar reddening, the Fe/H forbidden line, effective temperatures, surface gravities, and masses for twelve 'clump' stars at the blue end of the giant branch and for seven non-clump red giant members in NGC 7789 have been determined from existing UBV and DDO photoelectric data. For the metal abundance and helium content of the clump stars, Z of approximately 0.01 and Y of approximately 0.38, respectively were found. The masses of the red giants are found to be higher than those of the clump stars. On average, the masses of the clump stars are about half of the turnoff point mass. It is concluded that the clump stars could have undergone mass loss before reaching their helium core burning phase of evolution. This conclusion arises from an analysis of the several sources entering the mass determination.
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