Abstract
view Abstract Citations (31) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Luminous Blue Variables at Quiescence: The Zone of Avoidance in the Hertzsprung-Russell Diagram Stothers, Richard B. ; Chin, Chao-Wen Abstract Two phases of dynamical instability are theoretically predicted to exist during the evolution of supergiants of normal metallicity that are initially more massive than approximately 60 solar mass. One phase occurs briefly in the yellow or red region of the Hertzsprung-Russell diagram for stars in the early stages of core helium burning, and the other phase occurs for a longer time in the blue or blue-white region for stars exhausting their core helium. Probably only the second phase exists in the case of supergiants with initial masses between approximately 60 solar mass and approximately 30 solar mass or with low metallicities The cause of instability is the partial ionization of hydrogen and helium in a quasi-isolated outer region of the stellar envelope, above the layer where the iron opacity attains a large local maximum. Predicted luminosities, effective temperatures, ejected nebular masses, remnant masses, eruption recurrence times, and lifetimes, though very approximate, are generally consistent with available observational data for the important class of unstable supergiants known as luminous blue variables. Publication: The Astrophysical Journal Pub Date: May 1994 DOI: 10.1086/187335 Bibcode: 1994ApJ...426L..43S Keywords: Blue Stars; Hertzsprung-Russell Diagram; Magnetohydrodynamic Stability; Metallicity; Stellar Composition; Stellar Envelopes; Stellar Evolution; Stellar Luminosity; Stellar Mass Ejection; Stellar Models; Stellar Winds; Supergiant Stars; Variable Stars; Mathematical Models; Opacity; Stellar Mass; Stellar Temperature; Astrophysics; STARS: EVOLUTION; STARS: OSCILLATIONS; STARS: VARIABLES: OTHER MISCELLANEOUS full text sources ADS | data products SIMBAD (10)
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