Results 91 to 100 of about 1,202 (206)
Sliding along the Eddington Limit—Heavy-Weight Central Stars of Planetary Nebulae
Galaxies, 2018 Due to thermal pulses, asymptotic giant branch (AGB) stars experience periods of convective mixing that provide ideal conditions for slow neutron-capture nucleosynthesis.
Lisa Löbling
doaj +1 more source
Péclet‐Number‐Dependent Longitudinal Dispersion in Discrete Fracture Networks
Water Resources Research, Volume 60, Issue 12, December 2024.Abstract Dispersion in fractured media impacts many environmental and geomechanical practices. It is mainly controlled by the structure of fracture networks and the Péclet number (Pe) $(Pe)$, but predicting it remains challenging. In this study, numerous three‐dimensional stochastic discrete fracture networks (DFNs) were generated, where the density ...
Tingchang Yin +3 more
wiley +1 more source
Bio‐Inspired Fluorescent Calcium Sulfate for the Conservation of Gypsum Plasterwork
Small, Volume 20, Issue 43, October 24, 2024.This study explores the nonclassical crystallization of calcium sulfates using calcein, aiming to develop bio‐inspired methods for tailored consolidation products in heritage conservation. Through this investigation, fluorescent nano‐bassanite (NB‐C) consolidants are synthesized.
Miguel Burgos‐Ruiz +6 more
wiley +1 more source
STARDUST FROM ASYMPTOTIC GIANT BRANCH STARS
The Astrophysical Journal, 2009 The formation of dust in the outflows of low- and intermediate-mass stars on the first giant branch and asymptotic giant branch (AGB) is studied and the relative contributions of stars of different initial masses and metallicities to the interstellar medium (ISM) at the instant of solar system formation are derived.
Hans-Peter Gail +3 more
openaire +2 more sources
The Chemical Composition of Asymptotic Giant Branch Stars [PDF]
International Astronomical Union Colloquium, 1989 AbstractLow resolution spectroscopic and photometric studies of Magellanic Cloud AGB stars have shown that the M → S → C sequence is the result of the third dredge-up of 12C and s-process elements in AGB stars of low mass. In this paper, data on the chemical compositions of normal Galactic M → S → C stars are reviewed and shown to be broadly consistent
openaire +2 more sources
Spitzer observations of large amplitude variables in the LMC and IC 1613
EPJ Web of Conferences, 2017 The 3.6 and 4.5 ìm characteristics of asymptotic giant branch variables in the LMC and IC 1613 are discussed. For C-rich Mira variables there is a very clear periodluminosity-colour relation, where the [3.6] .
Whitelock Patricia A. +2 more
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First giant branch and asymptotic giant branch stars in nearby aggregates
The Astronomical Journal, 1991 The properties of the brightest red stars in several aggregates in the Galaxy are compared with theoretical models. 22 asymptotic giant branch (AGB) stars are identified, four of which are in the thermally pulsing AGB (TPAGB) phase and four of which are TPAGB carbon stars.
Icko Iben, Olin J. Eggen
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The Astronomical JournalHubble Space Telescope observations of 92 galaxies that have a strong showing of I -band asymptotic giant branch (IAGB) stars in their color–magnitude diagrams (CMDs) are used to measure the relative offset between the mean apparent I -band magnitudes of
Wendy L. Freedman +5 more
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A Parameter Study of 1D Atmospheric Models of Pulsating AGB Stars
GalaxiesUsing the atmospheric pulsation code written by George Bowen, we have performed a parameter study examining the effects of modifying various parameters of models of oxygen-rich AGB atmospheres pulsating in the fundamental and first-overtone modes.
Henry A. Prager +4 more
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Spectral evolution of asymptotic giant branch stars
The Astrophysical Journal, 1988 L'evolution des etoiles de masse intermediaire de la branche geante asymptotique est simulee numeriquement a partir d'un modele de perte de masse simple. Les resultats sont compares aux donnees photometriques et spectrometriques enregistrees par le satellite IRAS dans le domaine ...
Sun Kwok, Kevin Volk
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