Results 121 to 130 of about 1,424,303 (245)
Ba Enrichment in Gaia MS+WD Binaries: Tracing s-process Element Production
The Astrophysical Journal LettersA large population of intermediate-separation binaries, consisting of a main-sequence (MS) star and a white dwarf (WD), recently emerged from Gaia’s third data release (DR3), posing challenges to current models of binary evolution. Here we examine the s -
Param Rekhi +5 more
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Evolution of thermally pulsing asymptotic giant branch stars – II. Dust production at varying metallicity [PDF]
, 2013 We present the dust ejecta of the new stellar models for the Thermally Pulsing Asymptotic Giant Branch (TP-AGB) phase computed with the COLIBRI code. We use a formalism of dust growth coupled with a stationary wind for both M and C-stars. In the original
A. Nanni +3 more
semanticscholar +1 more source
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 +1 more source
Of Biogeography, Fishes and Kelp: Environmental DNA Metabarcoding the Great African Seaforest
Diversity and Distributions, Volume 31, Issue 6, June 2025.ABSTRACT Aim The biodiversity associated with kelp forest ecosystems is understudied globally, including in South Africa, where kelp forests have expanded their range under climate change. This study used environmental DNA (eDNA) metabarcoding to assess fish biodiversity across an expansive range (~1000 km) of South Africa's kelp forests, contributing ...
Kira‐Lee Courtaillac +2 more
wiley +1 more source
Agb (Asymptotic Giant Branch): Star Evolution
, 1987 Asymptotic giant branch stars are red supergiant stars of low-to-intermediate mass. This class of stars is of particular interest because many of these stars can have nuclear processed material brought up repeatedly from the deep interior to the surface ...
Becker, S. A.
core
CO observations of candidates for carbon-rich asymptotic giant branch and post-asymptotic giant branch stars [PDF]
, 1993 Circumstellar CO emission has been detected in a number of featureless or weak SiC emission, low color temperature IRAS sources. The CO detections confirm the suggestion that these are either extreme carbon stars, carbon-rich proto-planetary nebulae ...
Woodsworth, AW, Kwok, S, Volk, K
core +1 more source
The Astrophysical Journal LettersMass loss in low-mass stars during the red giant branch (RGB) and early asymptotic giant branch (EAGB) phases plays a key role in shaping stellar evolution, yet its dependence on stellar parameters such as metallicity remains poorly constrained, with ...
Csilla Kalup +4 more
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Dynamical Models of Asymptotic-Giant-Branch Stars [PDF]
Symposium - International Astronomical Union, 1974 The dynamical behaviour of the envelopes of four asymptotic-giant-branch stars of composition (X, Z)=(0.68, 0.02) and luminosity log L/L⊙ = 3.41, 3.60, 3.85 and 4.14 has been studied. At log L/L⊙ = 3.41, the envelope pulsates in the first-overtone mode and exhibits properties similar to those of the Mira variables.
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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
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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