Results 131 to 140 of about 3,997 (213)

Antisolar Differential Rotation May Have Revived Magnetic Braking in the Subgiant 31 Aquilae

The Astronomical Journal
Recent observations have shown that sufficiently slow rotation disrupts the organization of large-scale magnetic field in older main-sequence stars, leading to weakened magnetic braking (WMB) and a collapse in the efficiency of the global stellar dynamo.
Travis S. Metcalfe, Jennifer L. van Saders, Thomas R. Ayres, Derek Buzasi, Jeremy J. Drake, Ricky Egeland, Rafael A. García, Oleg Kochukhov, Steven H. Saar, Keivan G. Stassun, Sarbani Basu, J. M. Joel Ong, Amalie Stokholm, Timothy R. Bedding, Sylvain N. Breton, Ilya V. Ilyin, Pascal Petit, Marc H. Pinsonneault, Klaus G. Strassmeier   +18 more
doaj   +1 more source

The Rich Chemistry of Ionized Methanol With Sulfur Dioxide: Pathways to Prebiotic and Elusive Species in Earth's Atmosphere and Space

Chemistry – A European Journal, Volume 32, Issue 39, 22 October 2026.
The reaction between the methanol radical cation and sulfur dioxide is remarkably fast and forms several ionic and neutral products (HOSOH+, CH2OSO+, CH2OH+, CH2O, H2O, HSO2). The chemistry goes beyond simple proton or hydrogen transfer, revealing a close interaction between the two species, relevant to atmospheric and astrochemical environments where ...
Mauro Satta, Daniele Catone, Mattea Carmen Castrovilli, Antonella Cartoni   +3 more
wiley   +1 more source

The Treasury of Extremely Metal-poor O Stars

The Astrophysical Journal Supplement Series
The Treasury of Extremely Metal-Poor O Stars (TEMPOS) is a Hubble Space Telescope survey of hot and massive O-type stars in nearby, low-metallicity galaxies (≲20% of the solar metallicity, Z _⊙ ).
O. Grace Telford, Christiana Erba, Kristen B. W. McQuinn, Calum Hawcroft, Andreas A. C. Sander, Julia Roman-Duval, John Chisholm, Danielle A. Berg, Varsha Ramachandran, Yong Zheng, Claus Leitherer, Abby Mintz, Evan N. Kirby   +12 more
doaj   +1 more source

NanoSIMS-Analyse und hochauflösende Elektronenmikroskopie an präsolaren Silikaten aus roten Riesensternen und Supernovaexplosionen [PDF]

, 2009
This thesis deals with the analysis of “presolar” silicates and oxides by high resolution mass spectrometry and electron microscopy techniques. This “stardust” was identified by its extreme oxygen isotopic anomalies, which point to nucleosynthetic ...
Vollmer, Christian
core  

The Evolution of Parallel Electric Field Across the Earth's Magnetosheath

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract In Earth's collisionless magnetosheath, turbulence evolution and energy transformation across the system, especially at kinetic scales, remain poorly quantified without full‐coverage of high‐resolution observations. Using multi‐traversal observations from the 2023 and 2024 Magnetospheric Multiscale (MMS) Unbiased Magnetosheath Campaign, we ...
Y. Qi, R. E. Ergun, T. Vo, A. Chasapis, S. J. Schwartz, V. Wilder   +5 more
wiley   +1 more source

Enhancement of Magnetic Flux Transferred to the Magnetotail Due to a Storm‐Time Kelvin‐Helmholtz Instability

Geophysical Research Letters, Volume 53, Issue 19, 16 October 2026.
Abstract Along the flank magnetopause, magnetosheath flow interfaced with the relatively stationary magnetosphere produces strong flow shears, and the Kelvin‐Helmholtz instability (KHI) occurs. When the interplanetary magnetic field (IMF) is southward, anti‐parallel day‐side reconnection and KHI can interact, which may enhance the reconnection rate as ...
Brandon L. Burkholder, Katariina Nykyri, Xuanye Ma, Lauri Holappa, Harsha Gurram, Rachel C. Rice, David Sibeck, Dinesh K. V. Radhakrishnan   +7 more
wiley   +1 more source

Linear astrophysical dynamos in rotating spheres Differential rotation, anisotropic turbulent magnetic diffusivity, and solar-stellar cycle magnetic parity

The Astrophysical Journal, 1984
H. Yoshimura, Z. Wang, F. Wu
openaire   +1 more source

Linear Astrophysical Dynamos in Rotating Spheres - Solar and Stellar Cycle North-South Hemispheric Parity Selection Mechanism and Turbulent Magnetic Diffusivity

The Astrophysical Journal, 1984
H. Yoshimura, F. Wu, Z. Z. Wang
openaire   +1 more source

Microlensing search for extra solar planets [PDF]

, 2015
Gravitational microlensing may be used to probe distant stars for planetary companions. The presence of a planet in the vicinity of a star acting as the lens may cause a short lived anomaly in the observed lightcurve of the lensing event.
Tsapras, Yiannis
core  

Predictive Rankings of the Probability of Hosting a Temperate Terrestrial World for the HWO ExEP Mission Star List

The Astronomical Journal
The Habitable Worlds Observatory (HWO) is NASA’s flagship mission design from the 2020 Decadal Survey on Astronomy and Astrophysics, meant to observe temperate terrestrial planets via direct imaging and use direct spectroscopy of exoplanet reflected ...
Jamie Dietrich, Katelyn Ruppert, Austin Ware, Patrick A. Young   +3 more
doaj   +1 more source