Results 31 to 40 of about 215 (139)
The Astrophysical JournalWe present theoretical predictions of the born-again scenario for post-asymptotic giant branch stars. An extensive model grid for born-again objects has been constructed, particularly including models for the very late thermal pulse with and without ...
Zhongyang Liu +4 more
doaj +1 more source
Astronomy & AstrophysicsThe location of a star along the horizontal branch (HB) during core-helium burning is primarily determined by the amount of mass lost by its progenitor.
Arancibia Rojas E. +4 more
doaj +1 more source
On the Pre‐ and Post‐Positional Semi‐Random Graph Processes
Journal of Graph Theory, Volume 108, Issue 4, Page 819-831, April 2025.ABSTRACT We study the semi‐random graph process, and a variant process recently suggested by Nick Wormald. We show that these two processes are asymptotically equally fast in constructing a semi‐random graph G $G$ that has property P ${\mathscr{P}}$, for the following examples of P ${\mathscr{P}}$: (1) P ${\mathscr{P}}$ is the set of graphs containing ...
Pu Gao, Hidde Koerts
wiley +1 more source
Synthesis of Organic and Inorganic Compounds in Asymptotic Giant Branch Stars
GalaxiesAfter the synthesis of carbon in the core of asymptotic giant branch (AGB) stars, carbon is dredged up to the surface by convection. Many carbon-based molecules are formed in the subsequently developed stellar wind.
Sun Kwok
doaj +1 more source
Multiepoch Optical Spectroscopy of the Post-AGB Star HD 161796
The Astrophysical Journal, 2022 The evolutionary rate of the pulsating post–asymptotic giant branch (post-AGB) star HD 161796 was suspected to be high. Spectra of HD 161796 acquired during a time span of 18 yr are analyzed with the main goal of determining the evolutionary increase in ...
Kārlis Puķītis +2 more
doaj +1 more source
Ecological Implications of Germination Temperature on Native and Invasive Rumex Spp.
Plant-Environment Interactions, Volume 6, Issue 2, April 2025.ABSTRACT Rumex alpinus L. (R. alpinus) is a non‐native invasive plant in Czech mountain regions, altering ecosystem structure and function in protected areas. Rumex obtusifolius L. (R. obtusifolius) is a native species and a problematic weed in Czech meadows, while Rumex longifolius DC. (R.
Michaela Jungová +5 more
wiley +1 more source
Evidence for the Disruption of a Planetary System During the Formation of the Helix Nebula
The Astronomical Journal, 2022 The persistence of planetary systems after their host stars evolve into their post-main-sequence phase is poorly constrained by observations. Many young white dwarf systems exhibit infrared excess emission and/or spectral absorption lines associated with
Jonathan P. Marshall +7 more
doaj +1 more source
Blueprint for a Universal Theory of Learning to Read: The Combinatorial Model
Reading Research Quarterly, Volume 60, Issue 2, April/May/June 2025.The Reading Tree. Abstract In this essay, I outline some of the essential ingredients of a universal theory of reading acquisition, one that seeks to highlight commonalities while embracing the global diversity of languages, writing systems, and cultures.
David L. Share
wiley +1 more source
A Correlation between the Final Separation and Mass Ratio from Common-envelope Simulations
The Astrophysical JournalAnalytical models for common-envelope evolution (CEE), particularly the energy formalism, are used in binary population synthesis to predict post-CEE configurations.
Sarah V. Borges
doaj +1 more source
Pulsation-induced Spectroscopic Variability of IRAS Z02229+6208
The Astrophysical Journal, 2023 Monitoring of high-resolution spectra in the optical and near-infrared wavelength region was carried out for the early post-AGB stage star IRAS Z02229+6208 with the CARMENES instrument to reveal spectroscopic variability over the pulsation cycle of 154 ...
Laimons Začs, Kārlis Puķı̄tis
doaj +1 more source