Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Emily J. Griffith"'
Autor:
Alexander P. Ji, Sanjana Curtis, Nicholas Storm, Vedant Chandra, Kevin C. Schlaufman, Keivan G. Stassun, Alexander Heger, Marco Pignatari, Adrian M. Price-Whelan, Maria Bergemann, Guy S. Stringfellow, Carla Fröhlich, Henrique Reggiani, Erika M. Holmbeck, Jamie Tayar, Shivani P. Shah, Emily J. Griffith, Chervin F. P. Laporte, Andrew R. Casey, Keith Hawkins, Danny Horta, William Cerny, Pierre Thibodeaux, Sam A. Usman, João A. S. Amarante, Rachael L. Beaton, Phillip A. Cargile, Cristina Chiappini, Charlie Conroy, Jennifer A. Johnson, Juna A. Kollmeier, Haining Li, Sarah Loebman, Georges Meynet, Dmitry Bizyaev, Joel R. Brownstein, Pramod Gupta, Sean Morrison, Kaike Pan, Solange V. Ramirez, Hans-Walter Rix, José Sánchez-Gallego
Publikováno v:
The Astrophysical Journal Letters, Vol 961, Iss 2, p L41 (2024)
Stars that formed with an initial mass of over 50 M _⊙ are very rare today, but they are thought to be more common in the early Universe. The fates of those early, metal-poor, massive stars are highly uncertain. Most are expected to directly collap
Externí odkaz:
https://doaj.org/article/cb019f1a53ca4e8bbf8ef53fff9533f7
Autor:
Emily J. Griffith, David W. Hogg, Julianne J. Dalcanton, Sten Hasselquist, Bridget Ratcliffe, Melissa Ness, David H. Weinberg
Publikováno v:
The Astronomical Journal, Vol 167, Iss 3, p 98 (2024)
The element abundance pattern found in Milky Way disk stars is close to two-dimensional, dominated by production from one prompt process and one delayed process. This simplicity is remarkable, since the elements are produced by a multitude of nucleos
Externí odkaz:
https://doaj.org/article/7484b8e022b440d491632bb3e82be226
Autor:
Emily J. Griffith, Jennifer A. Johnson, David H. Weinberg, Ilya Ilyin, James W. Johnson, Romy Rodriguez-Martinez, Klaus G. Strassmeier
Publikováno v:
The Astrophysical Journal, Vol 944, Iss 1, p 47 (2023)
We measure abundances of 12 elements (Na, Mg, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni) in a sample of 86 metal-poor (−2 ≲ [Fe/H] ≲ −1) subgiant stars in the solar neighborhood. Abundances are derived from high-resolution spectra taken with the
Externí odkaz:
https://doaj.org/article/51128a44faf1471da3cbfb5dc504efbd
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 520:782-803
We derive empirical constraints on the nucleosynthetic yields of nitrogen by incorporating N enrichment into our previously developed and empirically tuned multi-zone galactic chemical evolution model. We adopt a metallicity-independent ("primary") N
Autor:
James W. Johnson, Charlotte R. Christensen, Alyson Brooks, Jonathan C. Bird, Sarah Loebman, Fiorenzo Vincenzo, Thomas R. Quinn, Emily J. Griffith, David H. Weinberg
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 508:4484-4511
We develop a hybrid model of galactic chemical evolution that combines a multi-ring computation of chemical enrichment with a prescription for stellar migration and the vertical distribution of stellar populations informed by a cosmological hydrodyna
Autor:
Emily J. Griffith, David H. Weinberg, Sven Buder, Jennifer A. Johnson, James W. Johnson, Fiorenzo Vincenzo
Publikováno v:
The Astrophysical Journal. 931:23
We investigate the [X/Mg] abundances of 16 elements for 82,910 Galactic disk stars from GALAH+ DR3. We fit the median trends of low-Ia and high-Ia populations with a two-process model, which describes stellar abundances in terms of a prompt core-coll
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 484:562-573
While we observe a large amount of cold interstellar gas and dust in a subset of the early-type galaxy (ETG) population, the source of this material remains unclear. The two main, competing scenarios are external accretion of lower mass, gas-rich dwa
Autor:
David H. Weinberg, Jennifer A. Johnson, Emily J. Griffith, Fiorenzo Vincenzo, James W. Johnson, Todd A. Thompson
We test the hypothesis that the observed first-peak (Sr, Y, Zr) and second-peak (Ba) s-process elemental abundances in low-metallicity Milky Way stars, and the abundances of the elements Mo and Ru, can be explained by a pervasive r-process contributi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0259d3187d4b62d636e6e6d1d69e0ca4
http://arxiv.org/abs/2102.04920
http://arxiv.org/abs/2102.04920
Autor:
Henrik Jönsson, James W. Johnson, Jon A. Holtzman, Jennifer A. Johnson, Richard R. Lane, Sten Hasselquist, D. A. García-Hernández, David M. Nataf, Rachael L. Beaton, Emily J. Griffith, David H. Weinberg, Alexandre Roman-Lopes
We compare abundance ratio trends in a sample of $\sim 11,000$ Milky Way bulge stars ($R_{\rm GC} < 3$ kpc) from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) to those of APOGEE stars in the Galactic disk ($5$ kpc $< R_{\rm GC}
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b5b37a70e9f091cfa912becca51f6316
http://arxiv.org/abs/2009.05063
http://arxiv.org/abs/2009.05063
Autor:
James W. Johnson, David H. Weinberg, Fiorenzo Vincenzo, Tuguldur Sukhbold, Jennifer A. Johnson, Emily J. Griffith
Publikováno v:
The Astrophysical Journal. 921:73
The landscape of black hole (BH) formation -- which massive stars explode as core-collapse supernovae (CCSN) and which implode to BHs -- profoundly affects the IMF-averaged nucleosynthetic yields of a stellar population. Building on the work of Sukhb