Results 1 to 10 of about 55,649 (206)
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 +6 more sources
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.
Sérgio Cristallo, Luciano Piersanti
exaly +3 more sources
Insights Into the Gas-Phase Structure and Internal Dynamics of Diphenylsilane: A Broadband Rotational Spectroscopy Study. [PDF]
ChemphyschemThe structure of diphenylsilane could be determined from the rotational spectra of all its singly substituted heavy atom isotopologues. A comparison with its oxygen analogue diphenylether revealed some interesting differences in the internal dynamics as well as in the gas‐phase structure.
Batra G, Schnell M.
europepmc +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.
Gary Mamon, A E Glassgold, P J Huggins
exaly +2 more sources
The abundance of S- and Si-bearing molecules in O-rich circumstellar envelopes of AGB stars [PDF]
Astronomy and Astrophysics, 2020 José Cernicharo +2 more
exaly +2 more sources
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
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
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
ChemPhysChem, Volume 24, Issue 22, November 16, 2023., 2023 Can the radical C5N bind a free electron to form a dipole‐bound state? The answer is sought using multi‐reference ab initio quantum chemical methods. Abstract We present results of quantum structure calculations aimed at demonstrating the possible existence of dipole‐bound states (DBS) for the anion C5N- ${{\rm{C}}_5 {\rm{N}}^ - }$ , a species already ...
Stanka Jerosimić +4 more
wiley +1 more source