Omega Centauri: weak MgH band in red giants directly traces the helium content
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DOI: 10.1093/mnras/staa1081
Abstract: High spectral resolution and high signal-to-noise ratio optical spectra of red giants in the globular cluster Omega Centauri are analysed for stellar parameters and chemical abundances of 15 elements including helium by either line equivalent… read more here.
Keywords: mgh; centauri weak; red giants; omega centauri ... See more keywords
Asteroseismology of luminous red giants with Kepler – II. Dependence of mass-loss on pulsations and radiation
Sign Up to like & getrecommendations! Published in 2020 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/staa3970
Abstract: Mass-loss by red giants is an important process to understand the final stages of stellar evolution and the chemical enrichment of the interstellar medium. Mass-loss rates are thought to be controlled by pulsation-enhanced dust-driven outflows.… read more here.
Keywords: loss rates; mass loss; red giants; asteroseismology ... See more keywords
Deep learning classification in asteroseismology
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DOI: 10.1093/mnras/stx1174
Abstract: In the power spectra of oscillating red giants, there are visually distinct features defining stars ascending the red giant branch from those that have commenced helium core burning. We train a one-dimensional convolutional neural network… read more here.
Keywords: deep learning; red giants; asteroseismology; classification asteroseismology ... See more keywords
A phenomenological modification of thermohaline mixing in globular cluster red giants
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DOI: 10.1093/mnras/stx1187
Abstract: Thermohaline mixing is a favoured mechanism for the so-called "extra mixing" on the red giant branch of low-mass stars. The mixing is triggered by the molecular weight inversion created above the hydrogen shell during first… read more here.
Keywords: red giants; lithium abundances; thermohaline mixing; carbon lithium ... See more keywords
Modelling Kepler red giants in eclipsing binaries: calibrating the mixing-length parameter with asteroseismology
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DOI: 10.1093/mnras/stx3079
Abstract: Stellar models rely on a number of free parameters. High-quality observations of eclipsing binary stars observed by Kepler offer a great opportunity to calibrate model parameters for evolved stars. Our study focuses on six Kepler… read more here.
Keywords: asteroseismology; red giants; mixing length; length parameter ... See more keywords