Zobrazeno 1 - 10
of 11 550
pro vyhledávání: '"element abundance"'
Autor:
Ness, Melissa K., Mendel, J. Trevor, Buder, Sven, Wheeler, Adam, Ji, Alexander P., Mijnarends, Luka, Venn, Kim, Starkenburg, Else, Leaman, Ryan, Grasha, Kathryn, Aquilina, Sarah
The element abundances of local group galaxies connect enrichment mechanisms to galactic properties and serve to contextualise the Milky Way's abundance distributions. Individual stellar spectra in nearby galaxies can be extracted from Integral Field
Externí odkaz:
http://arxiv.org/abs/2407.17661
Autor:
Horta, Danny, Price-Whelan, Adrian M., Hogg, David W., Johnston, Kathryn V., Widrow, Lawrence, Dalcanton, Julianne J., Ness, Melissa K., Hunt, Jason A. S.
Under the assumption of a simple and time-invariant gravitational potential, many Galactic dynamics techniques infer the Milky Way's mass and dark matter distribution from stellar kinematic observations. These methods typically rely on parameterized
Externí odkaz:
http://arxiv.org/abs/2312.07664
Autor:
Roederer, Ian U., Vassh, Nicole, Holmbeck, Erika M., Mumpower, Matthew R., Surman, Rebecca, Cowan, John J., Beers, Timothy C., Ezzeddine, Rana, Frebel, Anna, Hansen, Terese T., Placco, Vinicius M., Sakari, Charli M.
Publikováno v:
Science, 382, 1177-1180 (2023)
The heaviest chemical elements are naturally produced by the rapid neutron-capture process (r-process) during neutron star mergers or supernovae. The r-process production of elements heavier than uranium (transuranic nuclei) is poorly understood and
Externí odkaz:
http://arxiv.org/abs/2312.06844
Autor:
Garver, Bethany R., Nidever, David L., Debattista, Victor P., Silva, Leandro Beraldo e, Khachaturyants, Tigran
The Milky Way stellar disk has both a thin and a thick component. The thin disk is composed mostly of younger stars ($\lesssim$8 Gyr) with a lower abundance of $\alpha$ elements, while the thick disk contains predominantly older stars ($\gtrsim$8--12
Externí odkaz:
http://arxiv.org/abs/2306.12388
Autor:
Parul, Hanna, Bailin, Jeremy, Wetzel, Andrew, Gurvich, Alexander B., Faucher-Giguère, Claude-André, Hafen, Zachary, Stern, Jonathan, Snaith, Owain
Milky Way-mass galaxies in the FIRE-2 simulations demonstrate two main modes of star formation. At high redshifts star formation occurs in a series of short and intense bursts, while at low redshifts star formation proceeds at a steady rate with a tr
Externí odkaz:
http://arxiv.org/abs/2301.07692
Publikováno v:
Frontiers in Astronomy & Space Sciences. 2024, p01-17. 17p.
Akademický článek
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Based on the second Gaia data release (DR2) and APOGEE (DR16) spectroscopic surveys, wedefined two kinds of star sample: high-velocity thick disk (HVTD) with $v{\phi}>90km/s$ and metal-richstellar halo (MRSH) with $v{\phi}<90km/s$. Due to high resolu
Externí odkaz:
http://arxiv.org/abs/2105.03152
Autor:
Fernández-Trincado, José G., Beers, Timothy C., Barbuy, Beatriz, Mészáros, Szabolcs, Minniti, Dante, Smith, Verne V., Cunha, Katia, Villanova, Sandro, Geisler, Doug, Majewski, Steven R., Carigi, Leticia, Tang, Baitian, Bidin, Christian Moni, Vieira, Katherine
We derive abundance ratios for nine stars in the relatively high-metallicity bulge globular cluster NGC 6380. We find a mean cluster metallicity between [Fe/H]$= -0.80$ and $-0.73$, with no clear evidence for a variation in iron abundances beyond the
Externí odkaz:
http://arxiv.org/abs/2109.02661
Autor:
Reames, Donald V.
Publikováno v:
Space Science Rev. 217 72 (2021)
Sixty years ago the first observation was published showing solar energetic particles (SEPs) with a sampling of chemical elements. Thus began study of the direct products of dynamic physics in the solar corona. As we have progressed from 4-min soundi
Externí odkaz:
http://arxiv.org/abs/2107.14313