Results 41 to 50 of about 462 (193)
On the Age Distribution of Classical Cepheids in the Galaxy
Astronomische Nachrichten, Volume 346, Issue 5, June 2025.ABSTRACT We revisit the problem of the positive correlation between age and Galactocentric distance seen in Galactic Classical Cepheids, which at first sight may seem counter‐intuitive in the context of inside‐out galaxy formation. To explain it, we use the Besançon Galaxy Model and a simulation of star particles in the Galactic disc coupled with ...
Friedrich Anders +5 more
wiley +1 more source
Chemical and Photometric Evolution Models for Disk, Irregular, and Low Mass Galaxies
Advances in Astronomy, Volume 2014, Issue 1, 2014., 2014 We summarize the updated set of multiphase chemical evolution models performed with 44 theoretical radial mass initial distributions and 10 possible values of efficiencies to form molecular clouds and stars. We present the results about the infall rate histories, the formation of the disk, and the evolution of the radial distributions of diffuse and ...
Mercedes Mollá, Jorge Iglesias Páramo
wiley +1 more source
A Hertzsprung-Russell Diagram For Stellar Oscillations [PDF]
Symposium - International Astronomical Union, 1988 I present evolutionary tracks and curves of constant central hydrogen abundance in diagrams based on frequencies of high-order, low-degree p modes. For stars with masses between 0.7 and 1.5 M⊙, a clean separation is obtained between the effects of varying mass and varying evolutionary state.
openaire +1 more source
Journey to the cosmos: Navigating stellar evolution with differential equations
Alifmatika, 2023 Differential equations are a fundamental and versatile mathematical tool that finds widespread application across diverse academic disciplines, from physics and biology to economics and engineering.
Anshuman Jha +3 more
doaj +1 more source
Computer Graphics Forum, Volume 43, Issue 3, June 2024.Abstract The research communities studying visualization and sonification for data display and analysis share exceptionally similar goals, essentially making data of any kind interpretable to humans. One community does so by using visual representations of data, and the other community employs auditory (non‐speech) representations of data.
K. Enge +9 more
wiley +1 more source
Classical and Relativistic Orbital Motions around a Mass‐Varying Body
SRX Physics, Volume 2010, Issue 1, 2010., 2010 I work out the Newtonian and general relativistic effects due to an isotropic mass loss M˙/M of a body on the orbital motion of a test particle around it; the present analysis is also valid for a variation G˙/G of the Newtonian constant of gravitation. Concerning the Newtonian case, I use the Gauss equations for the variation of the elements and obtain
L. Iorio
wiley +1 more source
Estimating Stellar Parameters and Interstellar Extinction from Evolutionary Tracks
Open Astronomy, 2016 Developing methods for analyzing and extracting information from modern sky surveys is a challenging task in astrophysical studies. We study possibilities of parameterizing stars and interstellar medium from multicolor photometry performed in three ...
Sichevsky S., Malkov O.
doaj +1 more source
Evolutionary states of red-giant stars from grid-based modelling
EPJ Web of Conferences, 2017 From its surface properties it can be difficult to determine whether a red-giant star is in its heliumcore-burning phase or only burning hydrogen in a shell around an inert helium core.
Hekker Saskia +3 more
doaj +1 more source
Stellar Chromospheric Variability
Universe, 2021 Cool stars with convective envelopes of spectral types F and later tend to exhibit magnetic activity throughout their atmospheres. The presence of strong and variable magnetic fields is evidenced by photospheric starspots, chromospheric plages and ...
Richard de Grijs, Devika Kamath
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The Astrophysical Journal Supplement SeriesUnderstanding how and when galaxies formed stars over the history of the Universe is fundamental to the study of galaxy evolution. The star formation histories (SFHs) of galaxies in the local Universe can be measured with high precision using deep ...
Christopher T. Garling +5 more
doaj +1 more source