Results 101 to 110 of about 5,332 (183)

Composition of Giants 1° North of the Galactic Center: Detailed Abundance Trends for 21 Elements Observed with IGRINS

The Astrophysical Journal
We report the first high-resolution, detailed abundances of 21 elements for giants in the Galactic bulge/bar within 1° of the Galactic plane, where high extinction has rendered such studies challenging. Our high-signal-to-noise-ratio and high-resolution,
Govind Nandakumar, Nils Ryde, Gregory Mace, Kyle F. Kaplan, Niels Nieuwmunster, Daniel Jaffe, R. Michael Rich, Mathias Schultheis, Oscar Agertz, Eric Andersson, Christopher Sneden, Emily Strickland, Brian Thorsbro   +12 more
doaj   +1 more source

Shiva and Shakti: Presumed Proto-Galactic Fragments in the Inner Milky Way

The Astrophysical Journal
Using Gaia Data Release 3 astrometry and spectroscopy, we study two new substructures in the orbit–metallicity space of the inner Milky Way: Shakti and Shiva.
Khyati Malhan, Hans-Walter Rix
doaj   +1 more source

Evaluating Classifications of Extremely Metal-poor Candidates Selected from Gaia XP Spectra

The Astronomical Journal
Extremely metal-poor stars are intrinsically rare, but emerging methods exist to accurately classify them from all-sky Gaia XP low-resolution spectra.
Riley Thai, Andrew R. Casey, Alexander P. Ji, Vedant Chandra, Hans-Walter Rix   +4 more
doaj   +1 more source

How to Build an Empirical Speed Distribution for Dark Matter in the Solar Neighborhood

The Astrophysical Journal
The dark matter flux in a direct detection experiment depends on its local speed distribution. This distribution has been inferred from simulations of Milky Way–like galaxies, but such models serve only as proxies, given that no simulation directly ...
Tal Shpigel, Dylan Folsom, Mariangela Lisanti, Lina Necib, Mark Vogelsberger, Lars Hernquist   +5 more
doaj   +1 more source

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

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

Stellar Ages for Galactic Archaeology : Methods and Applications [PDF]

, 2021
Galactic Archaeology is the study of the formation and evolution of the Milky Way through the properties of stars and stellar populations. The combination of stellar ages, chemical compositions, positions, and velocities can reveal the history of star formation and chemical enrichment in different regions of the Galaxy.
openaire  

Asteroseismology of Metal-poor Red Giants Observed by TESS

The Astrophysical Journal
Galactic archeology has long been limited by a lack of precise masses and ages for metal-poor stars in the Milky Way’s thick disk. However, with TESS providing a growing number of photometric observations, it is possible to calculate masses and ages for ...
Corin Marasco, Jamie Tayar, David Nidever   +2 more
doaj   +1 more source

Galactic archaeology with the oldest stars in the Milky Way

, 2020
During a dark night, it is possible to observe thousands of stars by eye. All these stars are located within the Milky Way, our home. Not all stars are the same, they can have different sizes, masses, temperatures and ages. Heavy stars do not live long (in astronomical terms), only a few million years, but stars less massive than the Sun can get more ...
openaire   +2 more sources

Galactic Archaeology with neutron-capture elements in the Bulge

, 2023
In the last years, the search for the oldest stars have started to investigate the central region of our Galaxy. The Galactic bulge hosts extremely old stars, with ages compatible with the ages of the oldest halo stars. The data coming from these recent observations present new signatures in neutron capture elements.
openaire   +1 more source