Starquakes spring stellar surprises

Kurtz, D. W.; Jeffrey, Simon; Aerts, C.

doi:10.1093/astrogeo/atw151

Cited by 4 publications

(6 citation statements)

References 42 publications

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“…This diagram was initiated by Christensen-Dalsgaard (1998) and has been adapted many times. Versions can be found in Aerts et al (2010), Jeffery & Saio (2016), Kurtz et al (2016), Degroote (2010), Pápics (2013), and. This diagram is a useful guide to our discussion, but is intentionally schematic, since the classes of the stars and their boundaries are fluid.…”

Section: Forward Modelingmentioning

confidence: 99%

“…Tycho Brahe's quest for ever higher astrometric precision was fundamental to Johannes Kepler's discovery of his laws of motion for the planets (which led to, much later, the naming of the Kepler mission). Kurtz et al (2016), in the spirit of Tycho Brahe, called this quest for precision the Tychonic Principle, where a revolutionary improvement in precision inevitably leads to discovery.…”

Section: Figurementioning

confidence: 99%

“…Its evolutionary future is to evolve through a series of loops to become a pre-white dwarf. At present, it is the remarkable "bornagain rocket star" (Jeffery et al 2015;Kurtz et al 2016) which accelerates pulsationally from 0 − 100 km s −1 in 15 min with a Mach-10 pulse (239 km s −1 ) running through its atmosphere! This, thus, allows a look at extreme pulsation amplitude and supersonic velocity in a stellar atmosphere.…”

Section: Extreme Helium (Ehe) Stars Pv Tel Stars and R Crb Starsmentioning

confidence: 99%

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Asteroseismology across the HR diagram

Kurtz¹

2022

Preprint

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Asteroseismology has grown from its beginnings three decades ago to a mature field teeming with discoveries and applications. This phenomenal growth has been enabled by space photometry with precision 10 − 100 times better than ground-based observations, with nearly continuous light curves for durations of weeks to years, and by large scale ground-based surveys spanning years designed to detect all timevariable phenomena. The new high precision data are full of surprises, deepening our understanding of the physics of stars.• This review explores asteroseismic developments from the last decade primarily as a result of light curves from the Kepler and TESS space missions for: massive upper main-sequence OBAF stars, pre-mainsequence stars, peculiar stars, classical pulsators, white dwarfs and subdwarfs, and tidally interacting close binaries. • The space missions have increased the numbers of pulsators in many classes by an order of magnitude. • Asteroseismology measures fundamental stellar parameters and stellar interior physics -mass, radius, age, metallicity, luminosity, distance, magnetic fields, interior rotation, angular momentum transfer, convective overshoot, core burning stage -supporting disparate fields such as galactic archeology, exoplanet host stars, supernovae progenitors, gamma ray and gravitational wave precursors, close binary star origins and evolution, and standard candles. • Stars are the luminous tracers of the universe. Asteroseismology significantly improves models of stellar structure and evolution on which all inference from stars depends.

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Section: Forward Modelingmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Extreme Helium (Ehe) Stars Pv Tel Stars and R Crb Starsmentioning

confidence: 99%

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Asteroseismology across the HR diagram

Kurtz¹

2022

Preprint

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“…[6] There are strong connections between stochastic and deterministic mass-action systems. [3][4][5]52] For example, under appropriate volume scaling, the solutions of the stochastic system converge to those of the deterministic system. [52] Moreover, if the deterministic system is complex-balanced, then the stochastic system has a unique stationary distribution, which is a product of Poisson distributions.…”

Section: Stochastic Mass-action Systemsmentioning

confidence: 99%

“…[3][4][5]52] For example, under appropriate volume scaling, the solutions of the stochastic system converge to those of the deterministic system. [52] Moreover, if the deterministic system is complex-balanced, then the stochastic system has a unique stationary distribution, which is a product of Poisson distributions. [5] Alternatively, instead of studying a Markov process, one may choose to study the time evolution of the distribution on the state space, as governed by the chemical master equation, a system of ordinary differential equations whose dimension is the size of the state space.…”

Section: Stochastic Mass-action Systemsmentioning

confidence: 99%

Mathematical Analysis of Chemical Reaction Systems

Crăciun

2018

Israel Journal of Chemistry

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The use of mathematical methods for the analysis of chemical reaction systems has a very long history, and involves many types of models: deterministic versus stochastic, continuous versus discrete, and homogeneous versus spatially distributed. Here we focus on mathematical models based on deterministic mass‐action kinetics. These models are systems of coupled nonlinear differential equations on the positive orthant. We explain how mathematical properties of the solutions of mass‐action systems are strongly related to key properties of the networks of chemical reactions that generate them, such as specific versions of reversibility and feedback interactions.

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Precise astrometry: Earth Analogs and Beyond

Horzempa

2022

Exp Astron

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Starquakes spring stellar surprises

Cited by 4 publications

References 42 publications

Asteroseismology across the HR diagram

Asteroseismology across the HR diagram

Mathematical Analysis of Chemical Reaction Systems

Precise astrometry: Earth Analogs and Beyond

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