Results 61 to 70 of about 692 (185)

Asteroseismology for Galactic archaeology: bridging two fields [PDF]

Proceedings of the International Astronomical Union, 2015
AbstractAsteroseismology has the capability of precisely determining stellar properties that would otherwise be inaccessible, such as radii, masses, and thus ages of field stars. When coupling this information with classical determinations of stellar parameters, such as metallicities, effective temperatures, and angular diameters, powerful new ...
Luca Casagrande, Victor Silva Aguirre, Aldo M. Serenelli   +2 more
openaire   +1 more source

Barium Stars across the Milky Way: Probing Their Origins via the GALAH Survey

The Astrophysical Journal
Barium stars are unusually enriched in barium ([Ba/Fe] ≥ 1.0 dex) and not predicted by current Galactic chemical evolution models. Previous observations of barium stars have found evidence that they form through mass transfer from a companion asymptotic ...
Jaden Levine, Catherine Manea, Keith Hawkins, Kendall Sullivan, Kate H. R. Rubin, Zachary Maas, Andrew C. Nine   +6 more
doaj   +1 more source

Environmental and Temporal Effects on Vocal Activity in a Nocturnal Primate: Implications for Passive Acoustic Monitoring

American Journal of Primatology, Volume 88, Issue 3, March 2026.
Passive acoustic monitoring of the Critically Endangered Nosy Be sportive lemur (Lepilemur tymerlachsoni) for two lunar cycles revealed that vocal activity (i.e., call rates) increased over a 4‐h sampling window starting at twilight. The lemurs also called more as temperature and moonlight increased, and called less when it rained.
Luke D. Martin, Eva S. Nomenjanahary, Herison Razafimanantsoa, Sylviane Volampeno, Alice M. Richardson, Robert D. Magrath, Alison M. Behie   +6 more
wiley   +1 more source

Tracing Hercules in Galactic azimuth with Gaia DR2

, 2019
The second data release of the Gaia mission has revealed, in stellar velocity and action space, multiple ridges, the exact origin of which is still debated.
O. Bienaymé, Monari, G., Famaey, Benoit, Gerhard, O., A. Siebert, G. Monari, B. Famaey, C. Wegg, Bienaymé, O., Wegg, C., Famaey, B., Ibata, R., Siebert, A., O. Gerhard, R. Ibata   +14 more
core   +1 more source

The Rise of the r-process in the Gaia-Sausage/Enceladus Dwarf Galaxy

The Astrophysical Journal
Neutron star mergers (NSMs) produce r -process elements after a time-delayed inspiral process. Once a significant number of NSMs are present in a galaxy, r -process elements, such as Eu, are expected to significantly increase with time.
Xiaowei Ou, Alexander P. Ji, Anna Frebel, Rohan P. Naidu, Guilherme Limberg   +4 more
doaj   +1 more source

Holocene History of the Lower Seine Estuary and the Commerce Valley Tributary (Normandy, France): A Palaeoenvironmental Framework for the Roman Landscape of Juliobona (Lillebonne) and Implication for Port Conditions

Geoarchaeology, Volume 41, Issue 2, March/April 2026.
ABSTRACT The sediment infill deposits of the Lower Commerce Valley in the Seine estuary, located near the Roman city of Juliobona (now Lillebonne, Normandy), provide valuable data on environmental changes during the Holocene, including sea‐level changes, sediment supply and anthropogenic influences.
Léa Mairaville, Stoil Chapkanski, Dominique Todisco, Cécile Finco, Christine Paillès, Jonas Parétias, Thierry Lepert, Amine Haddad, Johanne Ducastel, Fabrice Boufflers, Jérémy Leleu, Laurent Dezileau, Damase Mouralis   +12 more
wiley   +1 more source

StarFlow: Leveraging Normalizing Flows for Stellar Age Estimation in SDSS-V DR19

The Astronomical Journal
Understanding the ages of stars is crucial for unraveling the formation history and evolution of our Galaxy. Traditional methods for estimating stellar ages from spectroscopic data often struggle with providing appropriate uncertainty estimations and are
Alexander Stone-Martinez, Jon A. Holtzman, Yuxi(Lucy) Lu, Sten Hasselquist, Julie Imig, Emily J. Griffith, Earl P. Bellinger, Andrew K. Saydjari   +7 more
doaj   +1 more source

Rangitīkei River Terraces Formed During the Otira Glaciation: Lithostratigraphic Type Sections, Review and Conceptual Model

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 1, March 2026.
The Rangitīkei Valley in the lower North Island of New Zealand contains flights of river terraces that are influenced by changes in sediment supply, stream power and base level associated with Quaternary climate events over the last ∼350 thousand years.
Callum Rees, Alan Palmer, Utiku Potaka
wiley   +1 more source

Galactic Archaeology: what changes when ages are known?

, 2015
Galactic Archaeology has recently been challenged by the fact that stars observed now in a certain location are not necessarily born there, but could have been kicked out from their birth places by different internal and/or external processes.
I. Minchev, C. Chiappini, F. Anders
core   +1 more source

Machine Learning as Evidential Constraints in Historical Inference: The Case of Galactic Archaeology [PDF]

Machine learning (ML) shows strong performance in making accurate inferences from massive, high-dimensional data. Many scientists turn to this new tool when traditional inferential procedures cannot deal with overly messy data and complex target ...
Yao, Siyu
core   +1 more source