Abstract
view Abstract Citations (12) References (11) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Cooling White Dwarfs in Galactic Globulars Castellani, V. ; degl'Innocenti, S. ; Romaniello, M. Abstract We study the evolution of hot horizontal-branch models which miss the asymptotic branch (AGB) phase to produce 'low-mass' white dwarfs (WDs) with masses of the order of 0.5 solar mass. One finds that for each given metallicity there exists a maximum value for the mass of the H-rich envelope allowing the models to approach the cooling phase without the onset of CNO H-burning flashes; the larger the metallicity, the lower the mass of such a 'critical envelope.' Moreover, we find that above log L is approximately 1 the cooling rate appears drastically affected by the previous evolutionary history, allowing a meaningful discussion of the cooling laws only below such a luminosity. The dependence of the cooling rates on the mass of the H-rich envelope is investigated for suitable assumptions about the value of this parameter, discussing the contribution of both CNO and p-p H burning to the evolution. The investigation has been further extended to stars with larger He cores, showing that the final cooling structures closely approach available evaluations of post-AGB CO dwarfs, as the result of a convergence toward 'canonical' self-consistent WD structrues. On this basis, we discuss the influence of WD masses on both the cooling rate and the H-R diagram location of the cooling sequence. The application of this theoretical scenario to the WD population in stellar clusters is finally discussed. Publication: The Astrophysical Journal Pub Date: March 1994 DOI: 10.1086/173804 Bibcode: 1994ApJ...423..266C Keywords: Astronomical Models; Globular Clusters; Horizontal Branch Stars; White Dwarf Stars; Hertzsprung-Russell Diagram; Metallicity; Stellar Interiors; Stellar Luminosity; Astrophysics; GALAXY: GLOBULAR CLUSTERS: GENERAL; STARS: EVOLUTION; STARS: INTERIORS; STARS: WHITE DWARFS full text sources ADS |
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