Results 61 to 70 of about 353 (134)

Type IIb Supernova Progenitors in 3D: Variability and Episodic Mass Loss Revealed by Radiation Hydrodynamics Simulations

The Astrophysical Journal Letters
We present the first 3D radiation hydrodynamics simulations of partially stripped ( ${M}_{{\rm{core}}}\sim 10{M}_{\odot }$ , M _env  ∼ 0.1–1 M _⊙ ) yellow supergiant ( L  ∼ 10 ^5 L _⊙ , T _eff  ≈ 5000–8000 K) envelopes, constructed with Athena++ .
Jared A. Goldberg, Yan-Fei Jiang, Lars Bildsten, Matteo Cantiello   +3 more
doaj   +1 more source

Molecules and Chemistry in Red Supergiants

Galaxies
The envelopes of Red Supergiants (RSGs) have a unique chemical environment not seen in other types of stars. They foster an oxygen-rich synthesis but are tempered by sporadic and chaotic mass loss, which distorts the envelope and creates complex outflow ...
Lucy M. Ziurys, Anita M. S. Richards
doaj   +1 more source

Prevalence of non-aromatic carbonaceous molecules in the inner regions of circumstellar envelopes. [PDF]

Nat Astron, 2020
Martínez L, Santoro G, Merino P, Accolla M, Lauwaet K, Sobrado J, Sabbah H, Pelaez RJ, Herrero VJ, Tanarro I, Agúndez M, Martín-Jimenez A, Otero R, Ellis GJ, Joblin C, Cernicharo J, Martín-Gago JA.   +16 more
europepmc   +1 more source

Hα Emission among Evolved FGKM Stars: A Compendium from the Literature

The Astronomical Journal
Emission in the wings of the H α line among late-type giant stars occurs as a consequence of conditions in their chromospheres. Data from the literature have been used to document the incidence of H α emission among Population I giant stars as a function
Graeme H. Smith
doaj   +1 more source

The Chemistry of Cosmic Dust Analogues from C, C₂, and C₂H₂ in C-Rich Circumstellar Envelopes. [PDF]

Astrophys J, 2020
Santoro G, Martínez L, Lauwaet K, Accolla M, Tajuelo-Castilla G, Merino P, Sobrado JM, Peláez RJ, Herrero VJ, Tanarro I, Mayoral ÁL, Agúndez M, Sabbah H, Joblin C, Cernicharo J, Martín-Gago JÁ.   +15 more
europepmc   +1 more source

86th Annual Meeting of the Meteoritical Society (2024)

Meteoritics &Planetary Science, Volume 59, Issue S1, Page A1-A468, August 2024.
wiley   +1 more source

Phosphorus-bearing molecules PO and PN at the edge of the Galaxy. [PDF]

Nature, 2023
Koelemay LA, Gold KR, Ziurys LM.
europepmc   +1 more source

Unconventional gas-phase preparation of the prototype polycyclic aromatic hydrocarbon naphthalene (C₁₀H₈) via the reaction of benzyl (C₇H₇) and propargyl (C₃H₃) radicals coupled with hydrogen-atom assisted isomerization. [PDF]

Chem Sci, 2023
He C, Kaiser RI, Lu W, Ahmed M, Krasnoukhov VS, Pivovarov PS, Zagidullin MV, Azyazov VN, Morozov AN, Mebel AM.   +9 more
europepmc   +1 more source

Dance to Demise—How Massive Stars May Form Dense Circumstellar Shells before Explosion

The Astrophysical Journal
We investigate the evolution of red supergiant (RSG) progenitors of core-collapse supernovae (SNe) with initial masses between 12 and 20 M _⊙ , focusing on the effects of enhanced mass loss due to pulsation-driven instabilities in their envelopes and ...
Sutirtha Sengupta, Das Sujit, Arkaprabha Sarangi   +2 more
doaj   +1 more source

Investigating Asymmetry Development from SiO to H2O Maser Regions in VX Sagittarii

The Astronomical Journal
Simultaneous very-long-baseline interferometry monitoring observations of H _2 O and SiO masers toward VX Sagittarii were conducted from 2014 February to 2019 January.
Dong-Hwan Yoon, Se-Hyung Cho, Youngjoo Yun, Haneul Yang, Jaeheon Kim   +4 more
doaj   +1 more source