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Evolutionary versus dynamical time scales for the evolution of the central stars of planetary nebulae

1990; IOP Publishing; Volume: 351; Linguagem: Inglês

10.1086/168458

1538-4357

James K. McCarthy, J. R. Mould, R. H. Méndez, Rolf‐Peter Kudritzki, D. Husfeld, A. Herrero, Helen Groth,

History and Developments in Astronomy

view Abstract Citations (51) References (51) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Evolutionary versus Dynamical Time Scales for the Evolution of the Central Stars of Planetary Nebulae McCarthy, J. K. ; Mould, J. R. ; Mendez, R. H. ; Kudritzki, R. P. ; Husfeld, D. ; Herrero, A. ; Groth, H. G. Abstract The disagreement between evolutionary and dynamical time scales for the evolution of the central stars of planetary nebulae (CSPN) through the H-R diagram is investigated. Three possible reasons for the disagreement are examined: (1) the nebulae could have experienced a phase of rapid photoionization of material ejected previously while the stars were still on the AGB; (2) the central stars could have undergone a late helium shell flash and returned to the AGB; and (3) the AGB-CSPN evolutionary transition times could have been increased by small additional amounts of residual envelope material remaining after the superwind mass-loss phase. Mechanism (3) is favored here because it can account for evolutionary ages both less than and greater than the corresponding dynamical ages. Publication: The Astrophysical Journal Pub Date: March 1990 DOI: 10.1086/168458 Bibcode: 1990ApJ...351..230M Keywords: Asymptotic Giant Branch Stars; Planetary Nebulae; Stellar Evolution; Absorption Spectra; Hertzsprung-Russell Diagram; Photoionization; Stellar Envelopes; Stellar Mass; Stellar Winds; Astrophysics; NEBULAE: PLANETARY; STARS: EVOLUTION full text sources ADS | data products SIMBAD (23)