Other
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204..249b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, July 1983, p. 249-271. Research supported by the N
Other
49
Globular Clusters, Metallicity, Red Giant Stars, Stellar Spectra, Calibrating, Carbon, Dwarf Galaxies, Nitrogen, Radiant Flux Density, Stellar Gravitation, Stellar Temperature, Temperature Dependence
Scientific paper
Synthetic spectrum calculations are conducted in order to simulate the spectral flux densities for 177 red giants in 19 globular clusters measured by Searle and Zinn (1978), for 19 stars in the Draco dwarf spheroidal galaxy measured by Zinn (1978), and for 19 stars in the globular cluster Omega C Centauri measured by Rodgers et al. (1979). The synthetic spectrum calculations are compared with the observations in order to yield abundances for the stars observed and hence mean abundances for the clusters. Good agreement is found with the abundance results of Searle and Zinn, determined by a completely independent calibration. The metal-rich cluster M71 is determined to have M/H = -0.5. It is shown that the metal abundances derived for the most metal-rich clusters should be overestimated by about 0.3 dex due to an opacity source in the violet-blue spectral region which is missing in the calculations. Also obtained are the mean chemical abundance and the abundance range of Omega Centauri and Draco. These abundances are utilized to calibrate other empirical abundance indicators. In addition, the possibility of the Searle and Zinn observations giving information on the abundance of the specific elements C, N, and Ca is considered.
Bell Roger A.
Gustafsson Bengt
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