Results 141 to 150 of about 29,820 (298)
When do stars in 47 Tucanae lose their mass? [PDF]
, 2015 By examining the diffusion of young white dwarfs through the core of the globular cluster 47 Tucanae, we estimate the time when the progenitor star lost the bulk of its mass to become a white dwarf.
Antolini, Elisa +6 more
core +2 more sources
Dredge-Up in Asymptotic Giant Branch Stars [PDF]
Symposium - International Astronomical Union, 1999 The third dredge-up phenomenon in asymptotic giant branch stars, responsible for the formation of C stars, is discussed based on detailed evolutionary model calculations. The structural readjustment of the star as dredge-up proceeds is analyzed, and its consequences on dredge-up predictions discussed.
openaire +1 more source
Clinical and Translational Science, Volume 18, Issue 3, March 2025.ABSTRACT Electrocardiogram (ECG) interpretation and measurement is an essential aspect of patient safety and pharmacovigilance in clinical trials. Changes in the T wave segment of an ECG can provide both diagnostic and prognostic information and may be affected by a variety of intrinsic and extrinsic factors related to drug administration.
Robert M. Lester, Sabina Paglialunga
wiley +1 more source
, 2010 We explore the effects of photodissociation at the stages of post-asymptotic giant branch stars to find a mechanism able to produce multi-polar shapes. We perform two-dimensional gasdynamical simulations to model the effects of photodissociation in proto-
Abgrall +51 more
core +1 more source
The stellar origin of 7Li - Do AGB stars contribute a substantial fraction of the local Galactic lithium abundance? [PDF]
, 2001 We adopt up-to-date 7Li yields from asymptotic giant branch stars in order to study the temporal evolution of 7Li in the solar neighbourhood in the context of a revised version of the two-infall model for the chemical evolution of our galaxy. We consider
D'Antona, F +3 more
core +2 more sources
MULTIPLE SPIRAL BRANCHES ON LATE ASYMPTOTIC GIANT BRANCH STARS
The Astrophysical Journal, 2012 We present one-dimensional hydrodynamical models that suggest a new mechanism for generating spiral structures around evolved stars. In these models, the pulsation of the star initiates the mass outflow and generates shock waves from a static atmosphere.
Qian Wang, Lee Anne Willson
openaire +1 more source
Heterochrony and Oophagy Underlie the Evolution of Giant Filter‐Feeding Lamniform Sharks
Evolution &Development, Volume 27, Issue 1, March 2025.Retention of juvenile craniofacial characteristics by paedomorphosis (heterochrony) may have facilitated the evolution of gigantism in filter‐feeding lamniform sharks, by increasing the efficiency of prey acquisition. ABSTRACT Evolutionary transitions toward gigantic body sizes have profound consequences for the structure and dynamics of ecological ...
Joel H. Gayford +3 more
wiley +1 more source
Systematic Search for Water Fountain Candidates Using the Databases of Circumstellar Maser Sources
The Astrophysical Journal Supplement SeriesWater fountains (WFs) are thought to be objects in the morphological evolution of the circumstellar envelopes of low- and intermediate-mass evolved stars, transitioning from spherically symmetric to asymmetric shapes.
Haichen Fan +8 more
doaj +1 more source
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
The puzzle of the CNO isotope ratios in asymptotic giant branch carbon stars [PDF]
, 2016 Context. The abundance ratios of the main isotopes of carbon, nitrogen and oxygen are modified by the CNO-cycle in the stellar interiors. When the different dredge-up events mix the burning material with the envelope, valuable information on the ...
C. Abia +3 more
semanticscholar +1 more source