In nine of 22 globular clusters the most extreme second-population stars are underrepresented on the AGB relative to the RGB, with anomalous stars showing even stronger AGB-manqué signatures.
Ultraviolet Radiation from Evolved Stellar Populations -- I. Models
3 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
This series of papers comprises a systematic exploration of the hypothesis that the far ultraviolet radiation from star clusters and elliptical galaxies originates from extremely hot horizontal-branch (HB) stars and their post-HB progeny. This first paper presents an extensive grid of calculations of stellar models from the Zero Age Horizontal Branch through to a point late in post-HB evolution or a point on the white dwarf cooling track. We use the term `Extreme Horizontal Branch' (EHB) to refer to HB sequences of constant mass that do not reach the thermally-pulsing stage on the AGB. These models evolve after core helium exhaustion
years
2026 3representative citing papers
MESA models show residual hydrogen envelope mass sets effective temperature on the horizontal branch, with maximum values of 0.05-0.30 solar masses to avoid later thermally pulsing AGB evolution, plus explanations for blue hook stars and puffed-up pre-HB configurations.
Review of UV spectroscopy applications to hot evolved stars, emphasizing HST contributions and the need for continued observations ahead of HWO.
citing papers explorer
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Multiple populations along the asymptotic giant branch: a Gaia+APOGEE study of 22 Galactic globular clusters
In nine of 22 globular clusters the most extreme second-population stars are underrepresented on the AGB relative to the RGB, with anomalous stars showing even stronger AGB-manqué signatures.
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Shaping the horizontal branch: The role of envelope mass in the evolution of stripped core-helium-burning stars
MESA models show residual hydrogen envelope mass sets effective temperature on the horizontal branch, with maximum values of 0.05-0.30 solar masses to avoid later thermally pulsing AGB evolution, plus explanations for blue hook stars and puffed-up pre-HB configurations.
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Studying hot evolved stars with ultraviolet spectroscopy
Review of UV spectroscopy applications to hot evolved stars, emphasizing HST contributions and the need for continued observations ahead of HWO.