Claudia Aguilera

Stellar Research

Extra-mixing mechanisms in red giant branch stars

Low-mass stars experience a series of changes when they enter their post-main sequence evolution, including slower rotation velocities and deepening of the surface convective zone. This last process, the first dredge-up, dilutes the abundance of light elements. According to standard stellar evolution, which considers convection as its only mechanism of mixing chemical species in stellar […]

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Reconstructing the history of the Milky Way using phylogenetic trees (ERIS)

This Millenium Nucleus ERIS applies one of the principles of Darwin’s Theory of Evolution -descent with modification to the evolution of our Galaxy. Phylogenetic trees are used in biology to represent ancestors and descendants of species. In ERIS, the evolutionary relationship between stars comes from how they synthesize new elements in their interiors and pollute

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Gaia Benchmark Stars and references for spectroscopic studies

The Gaia Benchmark Stars are reference stars selected for calibration and validation of parameters for spectroscopic studies. The advantage of studying this particular set of stars is that their effective temperatures and logg are determined from their angular diameters, bolometric fluxes, and distances. Thus, they do not depend on spectroscopy. These stars, with fundamental parameters,

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TESS subgiants as probes of rotation and extra-mixing

Angular momentum evolution and extra mixing are two of the greatest uncertainties in stellar models of evolved stars. Subgiant stars are the transition between the main sequence, where models are properly calibrated, and the red giant branch phase, where models deviate from observations. As such, they work as anchoring points to study rotational and chemical

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