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Ultraviolet Radiation from Evolved Stellar Populations -- I. Models
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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
Forward citations
Cited by 5 Pith papers
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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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A Helium-shell Burning Blue Horizontal Branch Star Produced from Common Envelope Evolution
Feige 64 is a 0.35 solar mass helium-shell-burning BHB star in a 0.826-day orbit with a 1.26 solar mass white dwarf, best explained as a common-envelope remnant.
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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...
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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.
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Selected Results on Variable Stars Observed by TESS
A curated review of TESS-era results across the major classes of variable stars, with illustrative light curves, but with no new observational or theoretical result.
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