Results 71 to 80 of about 3,026,820 (400)
Not All Stars Are the Sun: Empirical Calibration of the Mixing Length for Metal-poor Stars Using One-dimensional Stellar Evolution Models [PDF]
, 2017 Theoretical stellar evolution models are constructed and tailored to the best known, observationally derived characteristics of metal-poor ([Fe/H] ∼ −2.3) stars representing a range of evolutionary phases: subgiant HD 140283, globular cluster M92, and ...
M. Joyce, B. Chaboyer
semanticscholar +1 more source
No Significant Evolution of Relations between Black Hole Mass and Galaxy Total Stellar Mass Up to z ∼ 2.5 [PDF]
Astrophysical Journal, 2019 We investigate the cosmic evolution of the ratio between black hole (BH) mass (MBH) and host galaxy total stellar mass (Mstellar) out to z ∼ 2.5 for a sample of 100 X-ray-selected moderate-luminosity, broad-line active galactic nuclei (AGNs) in the ...
H. Suh +6 more
semanticscholar +1 more source
Chaotic Dynamics of Stellar Spin in Binaries and the Production of Misaligned Hot Jupiters
EPJ Web of Conferences, 2015 Motivated by observed hot Jupiter systems with high stellar obliquities, we examine the dynamics of stellar spin in planetary systems with distant stellar companions, with inclinations sufficiently high so that the planet undergoes Kozai-Lidov ...
Anderson Kassandra R. +2 more
doaj +1 more source
The fates of massive stars: exploring uncertainties in stellar evolution with METISSE [PDF]
, 2020 In the era of advanced electromagnetic and gravitational wave detectors, it has become increasingly important to effectively combine and study the impact of stellar evolution on binaries and dynamical systems of stars. Systematic studies dedicated to exploring uncertain parameters in stellar evolution are required to account for the recent observations
arxiv +1 more source
Asteroseismology and Spectropolarimetry of the Exoplanet Host Star λ Serpentis
The Astronomical Journal, 2023 The bright star λ Ser hosts a hot Neptune with a minimum mass of 13.6 M _⊕ and a 15.5 day orbit. It also appears to be a solar analog, with a mean rotation period of 25.8 days and surface differential rotation very similar to the Sun.
Travis S. Metcalfe +33 more
doaj +1 more source
Statistical analysis of stellar evolution
The Annals of Applied Statistics, 2009 Published in at http://dx.doi.org/10.1214/08-AOAS219 the Annals of Applied Statistics (http://www.imstat.org/aoas/) by the Institute of Mathematical Statistics (http://www.imstat.org)
van Dyk, DA +4 more
openaire +6 more sources
Full-lifetime simulations of multiple unequal-mass planets across all phases of stellar evolution [PDF]
, 2016 We know that planetary systems are just as common around white dwarfs as around main-sequence stars. However, self-consistently linking a planetary system across these two phases of stellar evolution through the violent giant branch poses computational ...
D. Veras +6 more
semanticscholar +1 more source
The Evolution of Flare Activity with Stellar Age [PDF]
Astrophysical Journal, 2019 Using a recent census of flare stars from the Kepler survey, we have explored how flare activity evolves across stellar main-sequence lifetimes. We utilize a sample of 347 stars with robust flare activity detections and which have rotation periods ...
J. Davenport +5 more
semanticscholar +1 more source
The ups and downs of inferred cosmological lithium [PDF]
EPJ Web of ConferencesI summarize the stellar side of the cosmological lithium problem(s). Evidence from independent studies is accumulating and indicates that stars may very well be fully responsible for lowering their surface lithium from the predicted primordial value to ...
Korn Andreas
doaj +1 more source
The Astrophysical Journal, 2023 To decipher complex patterns of gravity-mode period spacings observed for intermediate-mass main-sequence stars is an important step toward a better understanding of the structure and dynamics in the deep radiative region of the stars.
Yoshiki Hatta
doaj +1 more source