Results 101 to 110 of about 853,229 (315)

Overlapping Open Clusters NGC 1750 and NGC 1758 behind the Taurus Dark Clouds. II. CCD Photometry in the Vilnius System

open access: yesOpen Astronomy, 2003
Seven-color photometry in the Vilnius system has been obtained for 420 stars down to V = 16 mag in the area containing the overlapping open clusters NGC 1750 and NGC 1758 in Taurus.
Straižys V.   +8 more
doaj   +1 more source

Large-scale Interstellar Structure and the Heliosphere [PDF]

open access: yesarXiv, 2013
The properties of interstellar clouds near the Sun are ordered by the Loop I superbubble and by the interstellar radiation field. Comparisons of the kinematics and magnetic field of the interstellar gas flowing past the Sun, including the Local Interstellar Cloud (LIC), indicate a geometric relation between Loop I as defined by radio synchrotron ...
arxiv  

Detection of Deuterated Formaldehyde in Interstellar Clouds [PDF]

open access: yesThe Astrophysical Journal, 1979
AbstractDeuterated formaldehyde has been detected for the first time in interstellar clouds; the observed ratio HDCO/H2CO implies formation by gas phase chemistry.
R. A. Linke   +3 more
openaire   +3 more sources

Emergence of Optical Activity and Surface Morphology Changes in Racemic Amino Acid Films Under Circularly Polarized Lyman‐α Light Irradiation

open access: yesChirality, Volume 36, Issue 11, November 2024.
The photoreaction induced by Lyman‐α circularly polarized light (CPL) irradiation in racemic alanine film is more complex than simple preferential photolysis of enantiopure alanine molecules, and formation of larger molecules is observed. Circular networks of order of 100 nm scale are introduced in the alanine film surface by the irradiation.
Masahiro Kobayashi   +10 more
wiley   +1 more source

Formation of All Three C2H4O Isomers—Ethylene Oxide (c-C2H4O), Acetaldehyde (CH3CHO), and Vinyl Alcohol (CH2CHOH)—in Ethanol-containing Interstellar Analog Ices

open access: yesThe Astrophysical Journal
Oxygen-containing complex organic molecules are key precursors to biorelevant compounds fundamental for the origins of life. However, the untangling of their interstellar formation mechanisms has just scratched the surface, especially for oxygen ...
Jia Wang   +3 more
doaj   +1 more source

A Component of the Smith High-velocity Cloud Now Crossing the Galactic Plane

open access: yesThe Astrophysical Journal, 2023
We have identified a new structure in the Milky Way: a leading component of the Smith high-velocity cloud that is now crossing the Galactic plane near longitude 25°. Using new 21 cm H i data from the Green Bank Telescope (GBT), we measured the properties
Felix J. Lockman   +3 more
doaj   +1 more source

High Velocity Rain: The Terminal Velocity of Model of Galactic Infall [PDF]

open access: yes, 1996
A model is proposed for determining the distances to falling interstellar clouds in the galactic halo by measuring the cloud velocity and column density and assuming a model for the vertical density distribution of the Galactic interstellar medium. It is shown that falling clouds with $N(H I) < \sim 10^{19} cm^{-2}$ may be decelerated to a terminal ...
arxiv   +1 more source

Interstellar H2 toward HD 37903

open access: yes, 2011
We present an analysis of interstellar H2 toward HD 37903, which is a hot, B 1.5 V star located in the NGC 2023 reflection nebula. Meyer et al. (2001) have used a rich spectrum of vibrationally excited H2 observed by the HST to calculate a model of the ...
Abgrall   +14 more
core   +1 more source

Probing the range of applicability of structure‐ and energy‐adjusted QM/MM link bonds III: QM/MM MD simulations of solid‐state systems at the example of layered carbon structures

open access: yesJournal of Computational Chemistry, Volume 45, Issue 26, Page 2186-2197, October 5, 2024).
The QM/MM simulation protocol involving carbonic link bonds was extended for the treatment of layered carbon structures to study the adsorption and intercalation properties of graphitic materials. Abstract The previously introduced workflow to achieve an energetically and structurally optimized description of frontier bonds in quantum mechanical ...
Felix R. S. Purtscher, Thomas S. Hofer
wiley   +1 more source

Nearby Supernova and Cloud Crossing Effects on the Orbits of Small Bodies in the Solar System

open access: yesThe Astrophysical Journal Letters
Supernova (SN) blasts envelop many surrounding stellar systems, transferring kinetic energy to small bodies in the systems. Geologic evidence from ^60 Fe points to recent nearby SN activity within the past several Myr.
Leeanne Smith   +2 more
doaj   +1 more source

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