Results 71 to 80 of about 2,624,667 (213)

Dynamics of Stellar Collisions [PDF]

arXiv, 2000
I compare gas-dynamical and stellar-dynamical models of collisions. These two models have distinctly different physics; for example, shocks introduce irreversibility in gas systems, while stellar systems evolve in a completely reversible fashion. Nonetheless, both models yield broadly similar results, suggesting that analogies between gas and stellar ...
arxiv  

Shock‐heated graphite in three IAB iron meteorites—Implications on the formation of diamond

Meteoritics &Planetary Science, EarlyView.
Abstract Iron meteorites, originating from the deepest parts of their parent bodies and separated during major break‐up events, surprisingly rarely contain diamonds despite experiencing similar pressure–temperature conditions as diamond‐bearing ureilites. In this study, graphite from three non‐magmatic IAB iron meteorites Canyon Diablo, Campo del Cielo,
Oliver Christ, Anna Barbaro, Ludovic Ferrière, Lidia Pittarello, M. Chiara Domeneghetti, Frank E. Brenker, Fabrizio Nestola, Matteo Alvaro   +7 more
wiley   +1 more source

A Stellar Model-fitting Pipeline for Solar-like Oscillations

, 2009
Over the past two decades, helioseismology has revolutionized our understanding of the interior structure and dynamics of the Sun. Asteroseismology will soon place this knowledge into a broader context by providing structural data for hundreds of Sun ...
J. Christensen-Dalsgaard, Joyce Ann Guzik, O. L. Creevey, Paul A. Bradley, T. S. Metcalfe   +4 more
core   +1 more source

Modeling Tracers of Young Stellar Population Age in Star-Forming Galaxies [PDF]

, 2013
The young stellar population of a star-forming galaxy is the primary engine driving its radiative properties. As a result, the age of a galaxy's youngest generation of stars is critical for a detailed understanding of its star formation history, stellar content, and evolutionary state. Here we present predicted equivalent widths for the H-beta, H-alpha,
arxiv   +1 more source

Impact crater lake evolution and concomitant hydrothermal mineralization recorded by the Wörnitzostheim drill core at the Ries impact structure, Germany

Meteoritics &Planetary Science, EarlyView.
Abstract Impact‐generated hydrothermal systems and postimpact crater lake systems are well‐documented geological phenomena; however, evidence of hydrothermal venting into impact crater lake systems has rarely been reported. We investigated the well‐preserved contact between hydrothermally altered impact melt‐bearing breccia (outer/surficial suevite ...
Matthew J. O. Svensson, Gordon R. Osinski, Fred J. Longstaffe, Timothy A. Goudge, Haley M. Sapers   +4 more
wiley   +1 more source

LUNA: Nuclear Astrophysics Deep Underground

, 2010
Nuclear astrophysics strives for a comprehensive picture of the nuclear reactions responsible for synthesizing the chemical elements and for powering the stellar evolution engine.
Alessandra Guglielmetti, Carlo Broggini, Clayton DD, Daniel Bemmerer, Roberto Menegazzo, Rolfs C   +5 more
core   +1 more source

Exploring the origins of magnetization within the Chicxulub crater upper peak ring

Meteoritics &Planetary Science, EarlyView.
Abstract Large terrestrial impacts may produce vast subsurface hydrothermal systems, capable of generating conditions favorable to the origin of life. Modeling suggests that these systems may persist for >1 million years for basin‐sized craters; however, direct experimental constraints on hydrothermal system duration are needed.
Christina M. Verhagen, Sonia M. Tikoo, Martin Schmieder, Jérôme Gattacceca, François Demory, Juliane Gross, David A. Kring, Paul V. Burger, Sean P. S. Gulick, Joanna V. Morgan, Mario Rebolledo‐Vieyra, Jaime Urrutia‐Fucugauchi, Annemarie E. Pickersgill, Cornelia Rasmussen   +13 more
wiley   +1 more source

Evry Leon Schatzman

, 2014
This article describes the life and work of French astrophysicist Evry Schatzman (1920-2010). He was a pioneer in the study of white dwarfs during the 1940s and was one of the proponents of the wave heating theory of the solar corona.
Luminet, Jean-Pierre
core  

Spectroscopic evidence of distinct stellar populations in the counter-rotating stellar disks of NGC 3593 and NGC 4550 [PDF]

, 2012
We present the results of integral-field spectroscopic observations of the two disk galaxies NGC 3593 and NGC 4550 obtained with VIMOS/VLT. Both galaxies are known to host 2 counter-rotating stellar disks, with the ionized gas co-rotating with one of them. We measured in each galaxy the ionized gas kinematics and metallicity, and the surface brightness,
arxiv   +1 more source

Microfaults: Abundant shear deformation and frictional melting in chondrites

Meteoritics &Planetary Science, EarlyView.
Abstract The majority of ordinary chondrite (OC) meteorites record some amount of textural evidence for impact‐induced deformation. Melt veins in some shocked samples have been compared to terrestrial impact‐related pseudotachylites, which form by frictional melting of host rock.
Craig R. Walton, Mahesh Anand, Maria Schönbächler   +2 more
wiley   +1 more source