Results 11 to 20 of about 3,339,915 (332)

Basic Stellar Physics [PDF]

open access: yesEPJ Web of Conferences, 2023
Polytropes, Virial theorem, evolutionary time scales, degrees of freedom, radiative transport, molecular weight, degeneracy, Jeans mass, and Eddington luminosity are basic ingredients to describe the physics of stars.
Palmerini S.
doaj   +4 more sources

Population Synthesis to Constrain Galactic and Stellar Physics - I. Determining Age and Mass of Thin-Disc Red-Giant Stars [PDF]

open access: yesAstronomy and Astrophysics, 2017
Context. The cornerstone mission of the European Space Agency, Gaia , together with forthcoming complementary surveys (CoRoT, Kepler , K2, APOGEE, and Gaia -ESO), will revolutionize our understanding of the formation and history of our Galaxy, providing ...
Annie Robin   +2 more
exaly   +2 more sources

Stellar Flares [PDF]

open access: yesLiving Reviews in Solar Physics
Magnetic storms on stars manifest as remarkable, randomly occurring changes of the luminosity over durations that are tiny in comparison to the normal evolution of stars.
Adam F. Kowalski
exaly   +2 more sources

Chemical element transport in stellar evolution models [PDF]

open access: yesRoyal Society Open Science, 2017
Stellar evolution computations provide the foundation of several methods applied to study the evolutionary properties of stars and stellar populations, both Galactic and extragalactic.
Maurizio Salaris, Santi Cassisi
doaj   +3 more sources

Blue supergiants as tests for stellar physics [PDF]

open access: yesAstronomy & Astrophysics, 2021
Context. Massive star evolution is still poorly understood, and observational tests are required to discriminate between different implementations of physical phenomena in stellar evolution codes. Aims.
C. Georgy, H. Saio, G. Meynet
semanticscholar   +1 more source

Multiband gravitational-wave event rates and stellar physics [PDF]

open access: yesPhysical Review D, 2019
Joint gravitational-wave detections of stellar-mass black-hole binaries by ground- and space-based observatories will provide unprecedented opportunities for fundamental physics and astronomy.
D. Gerosa   +6 more
semanticscholar   +1 more source

Evidence for spots on hot stars suggests major revision of stellar physics [PDF]

open access: yesMonthly notices of the Royal Astronomical Society, 2019
It has long been thought that starspots are not present in the A and B stars because magnetic fields cannot be generated in stars with radiative envelopes. Space observations show that a considerable fraction of these stars varies in light with periods
L. Balona
semanticscholar   +1 more source

Extreme-ultraviolet Stellar Characterization for Atmospheric Physics and Evolution mission: motivation and overview

open access: yesJournal of Astronomical Telescopes Instruments and Systems, 2022
. The Extreme-ultraviolet Stellar Characterization for Atmospheric Physics and Evolution (ESCAPE) mission is an astrophysics Small Explorer employing ultraviolet spectroscopy (EUV: 80 to 825 Å and FUV: 1280 to 1650 Å) to explore the high-energy radiation
K. France   +29 more
semanticscholar   +1 more source

Role of stellar physics in regulating the critical steps for life [PDF]

open access: yesInternational Journal of Astrobiology, 2018
We use the critical step model to study the major transitions in evolution on Earth. We find that a total of five steps represents the most plausible estimate, in agreement with previous studies, and use the fossil record to identify the potential ...
M. Lingam, A. Loeb
semanticscholar   +1 more source

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