Results 1 to 10 of about 380 (165)
AGB Stars and Their Circumstellar Envelopes: An Operative Approach to Computing Their Atmospheres
Universe, 2021 The study of AGB stars necessarily covers a wide range of topics, from the primary astronomical observations to their interpretation in terms of fundamental physics.
S Cristallo +2 more
exaly +3 more sources
The abundance of S- and Si-bearing molecules in O-rich circumstellar envelopes of AGB stars [PDF]
Astronomy and Astrophysics, 2020 S Massalkhi, M Agúndez, J Cernicharo
exaly +2 more sources
The photodissociation of CO in circumstellar envelopes
Astrophysical Journal, 1988 The CO photodissociation rate for the unshielded ISM is calculated using recent laboratory results which confirm that photodissociation occurs by way of line absorption. A value of 2.0 x 10 to the -10th/s, an order of magnitude higher than the rate used in the past, is obtained.
G A Mamon, A E Glassgold, P J Huggins
exaly +2 more sources
n-Alkanes formed by methyl-methylene addition as a source of meteoritic aliphatics [PDF]
Communications ChemistryAliphatics prevail in asteroids, comets, meteorites and other bodies in our solar system. They are also found in the interstellar and circumstellar media both in gas-phase and in dust grains.
P. Merino +16 more
doaj +2 more sources
The chemistry in circumstellar envelopes of evolved stars: Following the origin of the elements to the origin of life [PDF]
Proceedings of the National Academy of Sciences of the United States of America, 2006 L M Ziurys
exaly +2 more sources
On the Presence of Metallofullerenes in Fullerene-rich Circumstellar Envelopes
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 +1 more source
The Chemistry of Cool Circumstellar Envelopes [PDF]
Symposium - International Astronomical Union, 1987 We have developed a time-dependent chemical kinetic model to describe the chemistry in the circumstellar envelopes of cool stars, with particular reference to IRC + 10216. Our detailed calculations show that ion-molecule reactions are important in the formation of many of the species observed in IRC + 10216.
L.A.M. Nejad, T. J. Millar
openaire +1 more source
Circumstellar Molecular Envelopes [PDF]
Symposium - International Astronomical Union, 1997 The results of C17O and C18O observations of low luminosity young stars are discussed and the derived properties of the circumstellar molecular envelopes described. Much of the circumstellar material is quiescent and cold. The youngest sources have envelopes which contain up to ∼ 0.3 M⊙ of material within 3000–4000 AU of the central star. From a survey
G. A. Fuller, E. F. Ladd
openaire +1 more source
AGB Stars and Their Circumstellar Envelopes. I. the VULCAN Code
Universe, 2021 The interplay between AGB interiors and their outermost layers, where molecules and dust form, is a problem of high complexity. As a consequence, physical processes like mass loss, which depend on the chemistry of the circumstellar envelope, are often ...
Sergio Cristallo +4 more
doaj +1 more source
Phosphorus in circumstellar envelopes [PDF]
Monthly Notices of the Royal Astronomical Society, 2001 ABSTRA C T We have investigated the chemistry of phosphorus-bearing compounds in the circumstellar envelopes of both oxygen-rich and carbon-rich evolved stars. In accordance with thermodynamic calculations of photospheric chemistry, we have assumed that the dominant forms of phosphorus in the inner circumstellar envelope (CSE) are PS and HCP in each ...
D. D. S. MacKay, S. B. Charnley
openaire +1 more source