Results 61 to 70 of about 5,067 (228)

The Determination of Electron Abundances in Interstellar Clouds [PDF]

Symposium - International Astronomical Union, 1979
A new method for estimating electron fractions in shielded molecular clouds is proposed on the basis of gas phase ion-molecule reactions which involves measuring the quantity . Applied to existing data, it yields upper limits to Xe in the range from 10−8 to 10−7 for a variety of clouds, warm as well as cool.
A. Wootten, R. Snell, A. E. Glassgold
openaire   +1 more source

Composite Single‐Reference and Explicitly Correlated Multireference Calculations on the Mechanism of Pyrrole Pyrolysis

Journal of Physical Organic Chemistry, Volume 39, Issue 4, April 2026.
New calculations have been applied to the pyrolysis of pyrrole under shock‐tube conditions and to the radical‐radical reaction between allyl and •CN at low temperature and pressure, using the same mechanistic scheme for both. ABSTRACT The pyrolysis of pyrrole has previously been studied in shock‐tube experiments and in jet‐stirred reactors. The results
Barry K. Carpenter
wiley   +1 more source

Two-component model of the interaction of an interstellar cloud with surrounding hot plasma

, 2011
International audienceWe present a two-component gasdynamic model of an interstellar cloud embedded in hot plasma. It is assumed that the cloud consists of atomic hydrogen gas, and that the interstellar plasma is quasi-neutral.
Izmodenov, Vlad V., Lallement, Rosine, R. Lallement, E. A. Provornikova, V. V. Izmodenov, Provornikova, E. A.   +5 more
core   +1 more source

Discovery of CO Clouds Associated with the X-Ray Jets of SS 433: Evidence for Shock–Cloud Interaction Enhancing Nonthermal X-Ray Emission

The Astrophysical Journal Letters
We report the first identification of molecular clumps directly associated with the rebrightening regions of the large-scale X-ray jets of SS 433, based on ^12 CO ( J = 1–0) observations with the Nobeyama 45 m Radio Telescope.
Haruka Sakemi, Hidetoshi Sano, Yasuo Fukui, Mami Machida, Shigeo S. Kimura, Masato I.N. Kobayashi, Kazuho Kayama, Hiroaki Yamamoto, Kengo Tachihara, Hiroshi Nagai   +9 more
doaj   +1 more source

Boron abundances in diffuse interstellar clouds [PDF]

Proceedings of the International Astronomical Union, 2009
AbstractWe present a comprehensive survey of B abundances in diffuse interstellar clouds from HST/STIS observations along 56 Galactic sight lines. Our sample is the result of a complete search of archival STIS data for the B II λ1362 resonance line, with each detection confirmed by the presence of absorption from other dominant ions at the same ...
Ritchey, A. M., Federman, S. R., Sheffer, Y., Lambert, D. L.   +3 more
openaire   +2 more sources

Deciphering the “Missing Xenon Paradox” in Celestial Bodies: A Multifaceted Perspective Toward Demystifying This Enigma

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Xenon (Xe) is a heavy noble gas with intriguing chemical properties, such as having several stable isotopes and the ability to form compounds under extreme conditions. Despite the predictions based on cosmochemical models that suggest xenon should be relatively abundant in planetary reservoirs, empirical data indicate a significant depletion ...
Avinash Kumar Both, Avradip Ghosh, Chin Li Cheung   +2 more
wiley   +1 more source

Mixing Interstellar Clouds Surrounding the Sun

, 2022
On its journey through the Galaxy, the Sun passes through diverse regions of the interstellar medium. High-resolution spectroscopic measurements of interstellar absorption lines in spectra of nearby stars show absorption components from more than a ...
Linsky, Jeffrey L, Swaczyna, Pawel, Winslow, Réka M, Schwadron, Nathan A, Bzowski, Maciej, Rahmanifard, Fatemeh, McComas, David J, Möbius, Eberhard, Frisch, Priscilla C, Redfield, Seth   +9 more
core   +1 more source

Turbulent interstellar cloud models

, 1986
Рассмотрены модели межзвездных облаков, поддерживаемых в равновесии турбулентным давлением с известным законом распределения по облаку. Получены уравнения, описывающие строение таких моделей, и проведен их анализ.
Колесник, И.Г.
core   +1 more source

THE ABUNDANCE OF BORON IN DIFFUSE INTERSTELLAR CLOUDS [PDF]

The Astrophysical Journal, 2011
We present a comprehensive survey of boron abundances in diffuse interstellar clouds from observations made with the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope. Our sample of 56 Galactic sight lines is the result of a complete search of archival STIS data for the B II 1362 resonance line, with each detection confirmed by ...
Ritchey, A. M., Federman, S. R., Sheffer, Y., Lambert, David L.   +3 more
openaire   +3 more sources

First Principles Rovibronic Absorption Spectra of HF Molecule

Journal of Computational Chemistry, Volume 47, Issue 6, March 5, 2026.
Hydrogen fluoride (HF) is astrophysically important, as it has been detected in sunspots, Venus, red giants, and the interstellar medium, serving as a probe of exoplanet atmospheres. This article presents an ab initio investigation of HF rovibronic spectroscopy, combining high‐level electronic‐structure data with nuclear‐motion solutions and refinement
Nariman Abu El Kher, Maha Shibli, Mahmoud Korek, Sergei N. Yurchenko, Jonathan Tennyson, Nayla El‐Kork   +5 more
wiley   +1 more source