Results 101 to 110 of about 55,649 (206)

Formation of SiC grains and the 11.3μm feature in circumstellar envelopes of carbon stars. [PDF]

, 1996
We propose that the so-called 11.3μm emission features observed toward carbon stars can be attributed to small spherical core-mantle type grains consisting of a SiC core and a carbon mantle or small carbon grains containing SiC as an impurity.
Henning, Thomas, Stognienko, Ralf, Kozasa, Takashi, Dorschner, Johann   +3 more
core  

BEYOND IRC+10216: NEW TRENDS IN THE DETECTION OF METAL MOLECULES TOWARDS CIRCUMSTELLAR ENVELOPES

, 2003
Author Institution: Department of Chemistry, Department of Astronomy, Steward Observatory, and Arizona Radio Observatory, University of ArizonaNew millimeter-wave observations towards the circumstellar envelopes of several late-type carbon stars have ...
Highberger, J. L., Ziurys, L. M.
core   +1 more source

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

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

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

86th Annual Meeting of the Meteoritical Society (2024)

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

CONSTRAINTS ON THE GEOMETRY OF CIRCUMSTELLAR ENVELOPES: Optical Interferometric and. . .

, 1997
We have obtained contemporaneous optical interferometry and spectropolarimetry of seven Be stars. The interferometry was done using both continuum and narrow Ha line Ðlters to observe the circumstellar envelope emission.
J. E. Bjorkman, C. A. Hummel, B. L. Babler, J.E. Bjorkman, D. F. Buscher, A. Quirrenbach   +5 more
core  

The Circumstellar Envelope of pi Gru

, 1999
CO(J = 2-1) and SiO(J = 5-4) emission has been observed from the molecular envelope around the nearby S star pi Gru. The CO line profile differs from the usual parabolic shape seen in uniformly expanding envelopes; it has a Voigt-like profile and two horns.
Knapp, G. R., Young, K., Crosas, M.
openaire   +2 more sources