Results 131 to 140 of about 56,706 (218)

Detection of early-universe gravitational-wave signatures and fundamental physics. [PDF]

Gen Relativ Gravit, 2022
Caldwell R, Cui Y, Guo HK, Mandic V, Mariotti A, No JM, Ramsey-Musolf MJ, Sakellariadou M, Sinha K, Wang LT, White G, Zhao Y, An H, Bian L, Caprini C, Clesse S, Cline JM, Cusin G, Fornal B, Jinno R, Laurent B, Levi N, Lyu KF, Martinez M, Miller AL, Redigolo D, Scarlata C, Sevrin A, Haghi BSE, Shu J, Siemens X, Steer DA, Sundrum R, Tamarit C, Weir DJ, Xie KP, Yang FW, Zhou S.   +37 more
europepmc   +1 more source

RAMSES-CH: A New Chemodynamics Code [PDF]

arXiv, 2012
We present a new chemodynamical code based on the adaptive mesh refinement code RAMSES. The new code uses Eulerian hydrodynamics and N-body dynamics in a cosmological framework to trace the production and advection of several chemical species. It is the first such code to follow the self-consistent evolution of chemical elements in cosmological volumes
arxiv  

Evidence of structural discontinuities in the inner core of red-giant stars. [PDF]

Nat Commun, 2022
Vrard M, Cunha MS, Bossini D, Avelino PP, Corsaro E, Mosser B.   +5 more
europepmc   +1 more source

Interstellar medium, young stars, and astrometric binaries in Galactic archaeology spectroscopic surveys [PDF]

arXiv, 2015
Current ongoing stellar spectroscopic surveys (RAVE, GALAH, Gaia-ESO, LAMOST, APOGEE, Gaia) are mostly devoted to studying Galactic archaeology and structure of the Galaxy. But they allow for important auxiliary science: (i) Galactic interstellar medium can be studied in four dimensions (position in space + radial velocity) through weak but numerous ...
arxiv  

Galactic-scale macro-engineering: Looking for signs of other intelligent species, as an exercise in hope for our own

, 2014
If we consider Big History as simply 'our' example of the process of cosmic evolution playing out, then we can seek to broaden our view of our possible fate as a species by asking questions about what paths or trajectories other species' own versions of ...
Voros, Joseph
core   +2 more sources

Improving Power Spectrum Estimation Using Multitapering: Efficient Asteroseismic Analyses for Understanding Stars, the Milky Way, and Beyond

The Astronomical Journal
Asteroseismic time series data have imprints of stellar oscillation modes, whose detection and characterization through time series analysis allows us to probe stellar interior physics.
Aarya A. Patil, Gwendolyn M. Eadie, Joshua S. Speagle, David J. Thomson   +3 more
doaj   +1 more source

Neutron-capture Element Abundances of 491 Stars in Milky Way Dwarf Satellite Galaxies from Medium-resolution Spectra

The Astrophysical Journal
The chemical compositions of evolved stars in Local Group dwarf spheroidal galaxies (dSphs) provide insight into the galaxy’s past star formation and nucleosynthesis. Neutron-capture element abundances are especially interesting.
Lauren E. Henderson, Evan N. Kirby, Mithi A. C. de los Reyes, Roman Gerasimov, Viraj Manwadkar   +4 more
doaj   +1 more source

RR Lyrae stars as tracers of substructure and Galactic archaeology

, 2020
Die eingereichte Arbeit umfasst mehrere Themen, die sich mit der Nutzung von RR-Lyrae-Sternen in verschiedenen astrophysikalischen Anwendungen in Verbindung mit Galaktischer Archäologie be- fassen. Zudem werden Projekte diskutiert, die mit der Pulsation und den physikalischen Eigen- schaften von RR-Lyrae-Veränderlichen in Verbindung stehen.
openaire   +2 more sources

The Stellar Abundances for Galactic Archaeology (SAGA) Database – III. Analysis of enrichment histories for elements and two modes of star formation during the early evolution of the Milky Way [PDF]

, 2013
Shimako Yamada, Takuma Suda, Yutaka Komiya, Wako Aoki, Masayuki Y. Fujimoto   +4 more
openalex   +1 more source

Stellar Models are Reliable at Low Metallicity: An Asteroseismic Age for the Ancient Very Metal-poor Star KIC 8144907

The Astrophysical Journal
Very-metal-poor stars ([Fe/H] < −2) are important laboratories for testing stellar models and reconstructing the formation history of our galaxy. Asteroseismology is a powerful tool to probe stellar interiors and measure ages, but few asteroseismic ...
Daniel Huber, Ditte Slumstrup, Marc Hon, Yaguang Li, Victor Aguirre Børsen-Koch, Timothy R. Bedding, Meridith Joyce, J. M. Joel Ong, Aldo Serenelli, Dennis Stello, Travis Berger, Samuel K. Grunblatt, Michael Greklek-McKeon, Teruyuki Hirano, Evan N. Kirby, Marc H. Pinsonneault, Arthur Alencastro Puls, Joel Zinn   +17 more
doaj   +1 more source