HE 1518-0948 is a post double helium white dwarf merger product currently ascending the helium giant branch via helium shell burning.
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An 11-species model with state-specific atomic H kinetics reproduces experimental radiance profiles from H2/He shocks and improves ionization and radiation predictions compared to alternate models.
Interferometric radius and TESS frequencies for κ Cyg reveal that MESA models fitting the oscillations overestimate radius and underpredict period spacing, indicating incorrect interior structure in core-helium-burning stars.
citing papers explorer
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Stars on the ascending helium giant branch I. From white dwarf merger to helium giant: the evolutionary state of the rapidly rotating hot subdwarf HE 1518-0948
HE 1518-0948 is a post double helium white dwarf merger product currently ascending the helium giant branch via helium shell burning.
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State-Specific Kinetic Modeling of Atomic H for H$_2$/ He Entry Flows
An 11-species model with state-specific atomic H kinetics reproduces experimental radiance profiles from H2/He shocks and improves ionization and radiation predictions compared to alternate models.
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CHARA Interferometry and TESS Asteroseismology of the Core-Helium Burning Red Giant $\kappa$ Cyg
Interferometric radius and TESS frequencies for κ Cyg reveal that MESA models fitting the oscillations overestimate radius and underpredict period spacing, indicating incorrect interior structure in core-helium-burning stars.