Survey of H-alpha emission in globular cluster red giants

Abstract

view Abstract Citations (53) References (56) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Survey of H-alpha emission in globular cluster red giants. Cacciari, C. ; Freeman, K. C. Abstract 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. Publication: The Astrophysical Journal Pub Date: May 1983 DOI: 10.1086/160943 Bibcode: 1983ApJ...268..185C Keywords: 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; Astrophysics full text sources ADS | data products SIMBAD (18)