Results 41 to 50 of about 5,324 (165)

Chemical Doppelgangers in GALAH DR3: The Distinguishing Power of Neutron-capture Elements among Milky Way Disk Stars

The Astrophysical Journal
The observed chemical diversity of Milky Way stars places important constraints on Galactic chemical evolution and the mixing processes that operate within the interstellar medium. Recent works have found that the chemical diversity of disk stars is low.
Catherine Manea, Keith Hawkins, Melissa K. Ness, Sven Buder, Sarah L. Martell, Daniel B. Zucker   +5 more
doaj   +1 more source

The R-Process Alliance: Chemodynamically Tagged Groups. II. An Extended Sample of Halo r-process-enhanced Stars

The Astrophysical Journal, 2023
Orbital characteristics based on Gaia Early Data Release 3 astrometric parameters are analyzed for ∼1700 r -process-enhanced (RPE; [Eu/Fe] > +0.3) metal-poor stars ([Fe/H] ≤ −0.8) compiled from the R -Process Alliance, the GALactic Archaeology with ...
Derek Shank, Timothy C. Beers, Vinicius M. Placco, Dmitrii Gudin, Thomas Catapano, Erika M. Holmbeck, Rana Ezzeddine, Ian U. Roederer, Charli M. Sakari, Anna Frebel, Terese T. Hansen   +10 more
doaj   +1 more source

Revealing growth increments in fossil and modern otoliths with backscattered electron imaging

Limnology and Oceanography: Methods, Volume 24, Issue 1, January 2026.
Abstract Otoliths, the functional earstones of teleost fishes, record growth in the form of microscopic increments, making them key archives of individual life histories. While increment analysis is commonly applied to modern otoliths, studies of fossil (Holocene) otoliths remain limited.
Isabella Leonhard, Emilia Jarochowska, Rafał Nawrot, Lovrenc Lipej, Martin Zuschin   +4 more
wiley   +1 more source

The APO-K2 Catalog. I. ∼7500 Red Giants with Fundamental Stellar Parameters from APOGEE DR17 Spectroscopy and K2-GAP Asteroseismology

The Astronomical Journal
We present a catalog of fundamental stellar properties for ∼7500 evolved stars, including stellar radii and masses, determined from the combination of spectroscopic observations from the Apache Point Observatory Galactic Evolution Experiment, part of the
Jessica Schonhut-Stasik, Joel C. Zinn, Keivan G. Stassun, Marc Pinsonneault, Jennifer A. Johnson, Jack T. Warfield, Dennis Stello, Yvonne Elsworth, Rafael A. García, Savita Mathur, Benoit Mosser, Marc Hon, Jamie Tayar, Guy S. Stringfellow, Rachael L. Beaton, Henrik Jönsson, Dante Minniti   +16 more
doaj   +1 more source

A Swing of the Pendulum: The Chemodynamics of the Local Stellar Halo Indicate Contributions from Several Radial Merger Events

The Astrophysical Journal, 2023
We find that the chemical abundances and dynamics of APOGEE and GALAH stars in the local stellar halo are inconsistent with a scenario in which the inner halo is primarily composed of debris from a single massive, ancient merger event, as has been ...
Thomas Donlon II, Heidi Jo Newberg
doaj   +1 more source

Stellar Archaeology -- Exploring the Universe with Metal-Poor Stars

, 2010
The abundance patterns of the most metal-poor stars in the Galactic halo and small dwarf galaxies provide us with a wealth of information about the early Universe.
Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Aoki, Argast, Arlandini, Arnone, Asplund, Barbuy, Barklem, Beers, Beers, Bergemann, Bessell, Bisterzo, Bonifacio, Bromm, Bromm, Bromm, Burris, Carollo, Carretta, Cayrel, Cayrel, Christlieb, Christlieb, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Collet, Cowan, Diemand, Feltzing, François, Frebel, Frebel, Frebel, Frebel, Frebel, Frebel, Frebel, Frebel, Frebel, Fröhlich, Fulbright, Fulbright, Geh, Geisler, Hayek, Heger, Hill, Honda, Honda, Honda, Iben, Ito, Ivans, Ivans, Ivans, Iwamoto, Johnson, Johnson, Johnson, Johnson, Johnson, Johnston, Jonsell, Jonsell, Karakas, Karlsson, Kirby, Kirby, Koch, Koch, Kratz, Kratz, Lai, Lai, Lai, Limongi, Lucatello, Masseron, McWilliam, McWilliam, Meynet, Meynet, Norris, Norris, Norris, Norris, Norris, Norris, Norris, Norris, Norris, Plez, Preston, Preston, Preston, Qian, Robertson, Roederer, Roederer, Ryan, Ryan, Ryan, Schatz, Schneider, Schörck, Searle, Shetrone, Shetrone, Shigeyama, Simmerer, Simon, Sivarani, Sivarani, Sneden, Sneden, Sneden, Sobeck, Spergel, Spite, Spite, Springel, Suda, Suda, Tominaga, Travaglio, Umeda, Wanajo, Westin, Wisotzki, Woosley, Yoshida, Zacs   +148 more
core   +1 more source

Effects of Aging on Magnetic Mineralogy of Natural Volcanic Glass: Implications for Geomagnetic Paleointensity Recorders

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 1, January 2026.
Abstract Natural volcanic glasses are well represented in the geologic record, and typically contain near‐ideal single‐domain particles required for standard Thellier‐type absolute paleointensity experiments. Young (<∼50–100 ka) glasses have been demonstrated to reliably record Earth's magnetic field.
Julie A. Bowles, Fatimah Abdulghafur, Sebastian Fearn, Vera Soltes   +3 more
wiley   +1 more source

Disentangling Metallicity Effects in Hot Jupiter Occurrence across Galactic Birth Radius and Phase-space Density

The Astronomical Journal
We explore how the correlation between host star metallicity and giant planets shapes hot Jupiter occurrence as a function of Galactic birth radius ( R _birth ) and phase-space density in the Milky Way disk.
Rayna Rampalli, Melissa K. Ness, Elisabeth R. Newton, Andrew Vanderburg, Tobias Buck, Jessica Mills   +5 more
doaj   +1 more source

The infant Milky Way [PDF]

, 2012
We investigate the physical properties of the progenitors of today living Milky Way-like galaxies that are visible as Damped Lya Absorption systems and Lya Emitters at higher redshifts (z ~ 2.3,5.7).
Ferrara, Andrea, Salvadori, Stefania
core   +3 more sources

Radial Migration in Spiral Galaxies

, 2014
The redistribution of stars in galactic disks is an important aspect of disk galaxy evolution. Stars that efficiently migrate in such a way that does not also appreciably heat their orbits can drastically affect the stellar populations observed today and
Debattista, V. P., Roškar, R.
core   +1 more source