Results 11 to 20 of about 2,649,849 (212)

Constraining stellar and orbital co-evolution through ensemble seismology of solar-like oscillators in binary systems. A census of oscillating red giants and dwarf stars in Gaia DR3 binaries

Astronomy & Astrophysics, 2023
Binary systems constitute a valuable astrophysics tool for testing our understanding of stellar structure and evolution. Systems containing at least one oscillating component are interesting in this regard because asteroseismology offers independent ...
P. G. Beck, D. Grossmann, L. Steinwender, L. Schimak, N. Muntean, M. Vrard, R. A. Patton, J. Merc, S. Mathur, R. García, M. Pinsonneault, D. Rowan, P. Gaulme, C. Allende Prieto, K. Z. Arellano-C'ordova, L. Cao, E. Corsaro, O. Creevey, K. Hambleton, A. Hanslmeier, B. Holl, J. Johnson, S. Mathis, D. Godoy-Rivera, S. Simón-Díaz, J. Zinn   +25 more
semanticscholar   +1 more source

On the lithium abundance of the visual binary components ξ Boo A (G8V) and ξ Boo B (K5V)

Astronomische Nachrichten, Volume 343, Issue 9-10, November-December 2022., 2022
Abstract A spectroscopic investigation of the lithium resonance doublet in ξ Boo A and ξ Boo B in terms of both abundance and isotopic ratio is presented. We obtained new R = 130,000 spectra with a signal‐to‐noise ratio (S/N) per pixel of up to 3200 using the 11.8 m LBT and PEPSI.
Klaus G. Strassmeier, Matthias Steffen
wiley   +1 more source

Contributions of structural variations to the asymptotic mixed‐mode coupling Factor in red giant stars

Astronomische Nachrichten, Volume 343, Issue 9-10, November-December 2022., 2022
Abstract The advent of ultra‐precise photometry space missions enables the possibility of investigating stellar interiors with mixed modes. The structural variations induced by the discontinuity of the chemical composition left behind during the first dredge–up is an important feature in the stellar mid‐layers located between the hydrogen‐burning shell
Chen Jiang
wiley   +1 more source

Solar System Science with the Orbiting Astronomical Satellite Investigating Stellar Systems (OASIS) Observatory

Space Science Reviews, 2022
The overarching theme of the Orbiting Astronomical Satellite for Investigating Stellar Systems (OASIS), an Astrophysics MIDEX-class mission concept, is Following water from galaxies, through protostellar systems, to Earth’s oceans.
C. Anderson, N. Biver, G. Bjoraker, T. Cavalié, G. Chin, M. Disanti, P. Hartogh, A. Tielens, C. Walker   +8 more
semanticscholar   +1 more source

Stellar Population Astrophysics (SPA) with TNG [PDF]

Astronomy & Astrophysics, 2020
Context. Open clusters are excellent tracers of the chemical evolution of the Galactic disc. The spatial distribution of their elemental abundances, through the analysis of high-quality and high-resolution spectra, provides insight into the chemical ...
G. Casali, L. Magrini, A. Frasca, A. Bragaglia, G. Catanzaro, V. D’Orazi, R. Sordo, E. Carretta, L. Origlia, G. Andreuzzi, X. Fu, A. Vallenari   +11 more
semanticscholar   +1 more source

Stellar population astrophysics (SPA) with the TNG [PDF]

Astronomy & Astrophysics, 2019
Context. Open clusters exquisitely track the Galactic disc chemical properties and its time evolution; a substantial number of studies and large spectroscopic surveys focus mostly on the chemical content of relatively old clusters (age ≳ 1 Gyr ...
V. d'orazi, E. Oliva, A. Bragaglia, A. Frasca, N. Sanna, K. Biazzo, G. Casali, S. Desidera, S. Lucatello, L. Magrini, L. Origlia   +10 more
semanticscholar   +3 more sources

The Photophysics of Nucleic Acids: Consequences for the Emergence of Life

ChemSystemsChem, Volume 5, Issue 1, January 2023., 2023
Photochemical reactions in nucleic acids induced by ultraviolet (UV) radiation could have played an important role in the prebiotic selection of the building blocks of life. This Review summarizes the quantum efficiencies of the photorelaxation pathways of nucleic acids and discusses its implications for the emergence of an initial sequence pool on ...
Corinna L. Kufner, Dominik B. Bucher, Dimitar D. Sasselov   +2 more
wiley   +1 more source

25 Years of Self-Organized Criticality: Solar and Astrophysics [PDF]

Space Science Reviews, 2014
Shortly after the seminal paper “Self-Organized Criticality: An explanation of 1/fnoise” by Bak et al. (1987), the idea has been applied to solar physics, in “Avalanches and the Distribution of Solar Flares” by Lu and Hamilton (1991).
M. Aschwanden, N. Crosby, M. Dimitropoulou, M. Georgoulis, S. Hergarten, James MdAteer, A. Milovanov, S. Mineshige, L. Morales, N. Nishizuka, G. Pruessner, R. Sánchez, Surjalal Sharma, Antoine Strugarek, V. Uritsky   +14 more
semanticscholar   +2 more sources

MESA ISOCHRONES AND STELLAR TRACKS (MIST). I. SOLAR-SCALED MODELS [PDF]

, 2016
This is the first of a series of papers presenting the Modules for Experiments in Stellar Astrophysics (MESA) Isochrones and Stellar Tracks (MIST) project, a new comprehensive set of stellar evolutionary tracks and isochrones computed using MESA, a state-
Jieun Choi, A. Dotter, C. Conroy, M. Cantiello, B. Paxton, Benjamin D. Johnson   +5 more
semanticscholar   +1 more source

An Improved IASI Temperature and Humidity Retrieval Method Based on Double Channel Differences

Earth and Space Science, Volume 9, Issue 12, December 2022., 2022
Abstract Due to surface emissivity, the retrieval accuracy of hyperspectral infrared temperature and humidity profiles is typically poor in the lower atmosphere. To solve this problem, we use the double channel differences method (DCDM) to retrieve the temperature and humidity profiles of the Infrared Atmospheric Sounding Interferometer (IASI) with ...
Xindong Cui, Zengliang Zhao, Zhigang Yao, Yang Wang, Xingtao Su, Jian Chen, Yisheng Zhang, Pengyu Tang   +7 more
wiley   +1 more source