Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...268..185c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 1, 1983, p. 185-194.
Astronomy and Astrophysics
Astrophysics
50
Emission Spectra, Globular Clusters, H Alpha Line, Red Giant Stars, Stellar Mass Ejection, Stellar Spectra, Hertzsprung-Russell Diagram, Metallicity, Open Clusters, Stellar Atmospheres, Stellar Luminosity, Stellar Temperature, Ubv Spectra
Scientific paper
An extensive H-alpha spectroscopic survey of red giants in twelve globular clusters and in three old open clusters is presented, covering a wide range of abundance. Mass loss rates are derived on the same assumptions used by Cohen (1976), and the observations are compared with the theoretical predictions of Fusi Pecci (1975) and Renzini's (1975) stellar wind model, as well as with Reimer's (1975) semi-empirical model. Evidence is presented that the emission components in the H-alpha profile are variable. The relation between the stellar luminosity and the FWHM of the H-alpha absorption feature is discussed. It is suggested that weak H-alpha emission may be present in most globular cluster giants with log L/solar L between 2.9 and 2.3 and perhaps even fainter. It is argued that this H-alpha emission is associated with the main part of the prehorizontal branch mass loss.
Cacciari Carla
Freeman Ken C.
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