Results 11 to 20 of about 55,649 (206)
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. Vibration-rotation lines of the $ν_{3}$ antisymmetric stretch of C$_{3}$ near 2040 cm$^{-1}$ (4.902 $μ$m) have been used to determine the column density for ...
Hargreaves, R. J. +2 more
core +7 more sources
Fullerenes and fulleranes in circumstellar envelopes
Journal of Physics: Conference Series, 2016 Three decades of search have recently led to convincing discoveries of cosmic fullerenes. The presence of C60 and C+ 60 in both circumstellar and interstellar environments suggests that these molecules and their derivatives can be efficiently formed in circumstellar envelopes and survive in harsh conditions. Detailed analysis of the infrared bands from
Sadjadi, S, Kwok, S, Zhang, Y
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, 2005 Illustrated Civil War envelopes with patriotic symbols, slogans and cartoons, mostly Northern, including a few Southern ...
core +16 more sources
Circumstellar envelope of the supergiant 89 Herculis [PDF]
Symposium - International Astronomical Union, 1987 A bright enigmatic supergiant, 89 Her (HD 163506; F2Ia, Mbol=-7m.5), exhibits the light variations (Percy et al. 1979, Fernie 1981, 1983) as well as the changes of radial velocities and structures of Balmer and sodium lines. Sargent and Osmer (1969) have given some evidences for the existence of expanding circumstellar envelope around 89 Her and have ...
J. L. Climenhaga +4 more
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International Journal of Chemical Kinetics, Volume 55, Issue 11, Page 731-742, November 2023., 2023 Abstract The kinetics of the tautomerization of thio‐imidic acids RC(SH)NH were determined at low (50–300 K) and high (500–1500 K) temperatures as R was varied to encompass mono‐ and diatomic species H, F, HO, NC, CN through H2N, HC(O), HC(S), HC≡ C, H3C, F3C, HOCH2, H2C=CH, CH3C(O), H2NCH2 and including ethyl, isopropyl and phenyl groups. The presence
Judith Würmel, John M. Simmie
wiley +1 more source
Constraining the Earliest Circumstellar Disks and Their Envelopes [PDF]
The Astrophysical Journal, 2008 23 pages, 4 figures, accepted for publication in the Astrophysical ...
Chiang, Hsin-Fang +4 more
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ChemPhysChem, Volume 24, Issue 20, October 17, 2023., 2023 Threshold photoelectron spectroscopy with vacuum ultraviolet synchrotron radiation and quantum chemical calculations shed new light on the ionization energies of xylyl, picolyl and lutidyl radicals. N‐ and CH3‐substituent effects on the ionization energies of benzyl‐type reactive intermediates are found to be position‐dependent and additive.
Keisuke Kanayama +5 more
wiley +1 more source
Crescent-shaped Molecular Outflow from the Intermediate-mass Protostar DK Cha Revealed by ALMA
The Astrophysical Journal, 2023 We report on an Atacama Large Millimeter/submillimeter Array study of the Class I or II intermediate-mass protostar DK Cha in the Chamaeleon II region.
Naoto Harada +8 more
doaj +1 more source
Theory of circumstellar envelopes [PDF]
Symposium - International Astronomical Union, 1987 After a comparison of conventional photospheres with circumstellar envelopes the radiation in spherical shells is considered. We discuss the transfer equation and a new quasi-exact solution in term of the transition matrix-Various methods used for the numerical evaluation of the specific intensities are summarized.
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A sensitive line search in circumstellar envelopes [PDF]
The Astrophysical Journal, 1988 AbstractA molecular line search in the range between 85 and 89 GHz has been performed in the circumstellar envelopes of 11 evolved stars. Emissions of 29SiO J=2−1,28SiO J=2−1, HCN J=1−0, H13CN J=1−0, HC5 N J=33−32, HCO+ J=1−0 transitions and other transitions of C2 H, C4 H, and C3 N have been observed in 11 stars.
null Nguyen-Q-Rieu +6 more
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