The abundance of S- and Si-bearing molecules in O-rich circumstellar envelopes of AGB stars. [PDF]
Astron Astrophys, 2020 Aims We aim to determine the abundances of SiO, CS, SiS, SO, and SO2 in a large sample of oxygen-rich asymptotic giant branch (AGB) envelopes covering a wide range of mass loss rates to investigate the potential role that these molecules could play in ...
Massalkhi S +3 more
europepmc +5 more sources
Small carbon chains in circumstellar envelopes [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 Observations were made for a number of carbon-rich circumstellar envelopes using the Phoenix spectrograph on the Gemini South telescope to determine the abundance of small carbon chain molecules.
Bernath, P. F. +2 more
core +8 more sources
On the Presence of Metallofullerenes in Fullerene-rich Circumstellar Envelopes [PDF]
The Astrophysical Journal, 2022 The presence of neutral C _60 fullerenes in circumstellar environments has been firmly established by astronomical observations as well as laboratory experiments and quantum-chemistry calculations. However, the large variations observed in the C _60 17.4
R. Barzaga +5 more
doaj +2 more sources
Prevalence of non-aromatic carbonaceous molecules in the inner regions of circumstellar envelopes. [PDF]
Nat Astron, 2020 Evolved stars are foundries of chemical complexity, gas and dust that provide the building blocks of planets and life, and dust nucleation first occurs in their photosphere.
Martínez L +16 more
europepmc +2 more sources
The Chemistry of Cosmic Dust Analogues from C, C<sub>2</sub>, and C<sub>2</sub>H<sub>2</sub> in C-Rich Circumstellar Envelopes. [PDF]
Astrophys J, 2020 Interstellar carbonaceous dust is mainly formed in the innermost regions of circumstellar envelopes around carbon-rich asymptotic giant branch stars (AGBs).
Santoro G +15 more
europepmc +3 more sources
The photodissociation of CO in circumstellar envelopes [PDF]
, 2017 Carbon monoxide is the most abundant molecule after H$_2$ and is important for chemistry in circumstellar envelopes around late-type stars. The size of the envelope is important when modelling low-J transition lines and deriving mass-loss rates from such
Groenewegen, M. A. T.
core +2 more sources
Sulphur molecules in the circumstellar envelopes of M-type AGB stars [PDF]
, 2016 The sulphur compounds SO and SO$_2$ have not been widely studied in the circumstellar envelopes of asymptotic giant branch (AGB) stars. By presenting and modelling a large number of SO and SO$_2$ lines in the low mass-loss rate M-type AGB star R Dor, and
Black, J. H. +4 more
core +2 more sources
Stellar masers, circumstellar envelopes, and supernova remnants [PDF]
Proceedings of the International Astronomical Union, 2007 This paper reviews recent advances in the study or circumstellar masers and masers found toward supernova remnants. The review is organized by science focus area, including the astrophysics of extended stellar atmospheres, stellar mass-loss processes and
Alvarez +23 more
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Photochemistry in the inner layers of clumpy circumstellar envelopes: formation of water in C-rich objects and of C-bearing molecules in O-rich objects [PDF]
, 2010 A mechanism based on the penetration of interstellar ultraviolet photons into the inner layers of clumpy circumstellar envelopes around AGB stars is proposed to explain the non-equilibrium chemistry observed in such objects.
Agúndez +23 more
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The abundance of HCN in circumstellar envelopes of AGB stars of different chemical types [PDF]
, 2013 A multi-transition survey of HCN (sub-) millimeter line emission from a large sample of AGB stars of different chemical type is presented. The data are analysed and circumstellar HCN abundances are estimated.
Bieging, J. H. +5 more
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