Results 51 to 60 of about 51,739 (211)

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

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

Modeling sulfur depletion in interstellar clouds [PDF]

Astronomy & Astrophysics, 2019
Context. The elemental depletion of interstellar sulfur from the gas phase has been a recurring challenge for astrochemical models. Observations show that sulfur remains relatively non-depleted with respect to its cosmic value throughout the diffuse and translucent stages of an interstellar molecular cloud, but its atomic and molecular gas-phase ...
Jacob C. Laas, Paola Caselli
openaire   +3 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

Interstellar Extinction in the Direction of The Barnard 1 Dark Cloud in Perseus

Open Astronomy, 2003
Spectral and luminosity classes, absolute magnitudes, color excesses, interstellar extinctions and distances are determined for 98 stars down to 18 mag in the Barnard 1 dark cloud belonging to the Per OB2 association. The classification of stars is based
Černis K., Straižys V.
doaj   +1 more source

Structure and evolution of interstellar carbonaceous dust. Insights from the laboratory

Frontiers in Astronomy and Space Sciences, 2022
A large fraction of interstellar carbon is locked up in solid grains. The nature, origin and evolution of these grains have been investigated for decades.
Víctor J. Herrero, Miguel Jiménez-Redondo, Miguel Jiménez-Redondo, Ramón J. Peláez, Belén Maté, Isabel Tanarro   +5 more
doaj   +1 more source

Gas stripping by radiation drag from an interstellar cloud

, 2004
We perform two-dimensional hydrodynamic simulation on the gas stripping by radiation drag from an interstellar cloud moving in uniform radiation fields.
Ferrarese, Ferrarese, Fortner, Fukue, Fukue, Fukue, Gebhardt, Gebhardt, Ho, Jun'ichi Sato, Kawakatu, Kawakatu, Kawakatu, Keisuke Sawada, Kormendy, Kormendy, Lamb, Laor, Loeb, Magorrian, Masayuki Umemura, McLure, McLure, Merrifield, Merritt, Merritt, Meyer, Mihalas, Miller, Mineshige, Miyoshi, Mori, Nakahashi, Nelson, Ohsuga, Poynting, Richstone, Robertson, Salucci, Sarzi, Shingo Matsuyama, Tsuribe, Tsuribe, Umemura, Umemura, Umemura, Umemura, Umemura, Wandel, Wandel   +49 more
core   +1 more source

Observations of Multiphase, High-velocity, Shocked Gas in the Vela Supernova Remnant

The Astrophysical Journal, 2023
We present an analysis of high-resolution far-UV archival spectra obtained with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope of the star HD 75309, which probes high-velocity shocked gas in the Vela supernova remnant (SNR).
Adam M. Ritchey
doaj   +1 more source

The mass spectrum of interstellar clouds [PDF]

International Astronomical Union Colloquium, 1989
AbstractThe abundance of 21-cm absorption lines seen in surveys at high latitudes can be translated into a line of sight abundance of clouds vs. column density using an empirical relationship between temperature and optical depth. As VLA surveys of 21-cm absorption at low latitudes are now becoming available, it is possible to study the variation of ...
John M. Dickey, Robert W. Garwood
openaire   +1 more source

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