Results 51 to 60 of about 22,085 (227)

The Local Group Galaxy IC 1613 and its asymptotic giant branch variables [PDF]

, 2015
JHKs photometry is presented from a three-year survey of the central regions of the Local Group dwarf irregular galaxy IC1613. The morphologies of the colour-magnitude and colour-colour diagrams are discussed with particular reference to the supergiants ...
J. Menzies, P. Whitelock, M. Feast
semanticscholar   +1 more source

An Innovative Tool for Measuring Sunlight Propagation Through Different Snowpacks

Earth and Space Science, Volume 12, Issue 8, August 2025.
Abstract Sunlight penetration in the snowpack plays a fundamental role in many environmental processes, ranging from local energy balance to snow microbiology and can potentially contribute to climate change. In addition, many photochemical reactions typically occur in the snowpack driven by solar radiation.
Luca Teruzzi, Andrea Spolaor, David Cappelletti, Claudio Artoni, Marco A. C. Potenza   +4 more
wiley   +1 more source

Planetary nebulae: a key tool to reconstruct the evolutionary history of stars

Frontiers in Astronomy and Space Sciences
Planetary nebulae, among the most fascinating objects in the sky, have been extensively investigated in the past years, because their study provides important information on the low and intermediate mass stellar populations of the host environment ...
Paolo Ventura, Silvia Tosi, Flavia Dell’Agli, Stefano Bianchi   +3 more
doaj   +1 more source

CLEAR EVIDENCE FOR THE PRESENCE OF SECOND-GENERATION ASYMPTOTIC GIANT BRANCH STARS IN METAL-POOR GALACTIC GLOBULAR CLUSTERS [PDF]

, 2015
Galactic globular clusters (GCs) are known to host multiple stellar populations: a first generation (FG) with a chemical pattern typical of halo field stars and a second generation (SG) enriched in Na and Al and depleted in O and Mg.
D. A. García-Hernández, S. Mészáros, M. Monelli, S. Cassisi, P. Stetson, O. Zamora, M. Shetrone, S. Lucatello   +7 more
semanticscholar   +1 more source

Systematic Search for Water Fountain Candidates Using the Databases of Circumstellar Maser Sources

The Astrophysical Journal Supplement Series
Water fountains (WFs) are thought to be objects in the morphological evolution of the circumstellar envelopes of low- and intermediate-mass evolved stars, transitioning from spherically symmetric to asymmetric shapes.
Haichen Fan, Jun-ichi Nakashima, D. Engels, Yong Zhang, Jian-Jie Qiu, Huan-Xue Feng, Jia-Yong Xie, Hiroshi Imai, Chih-Hao Hsia   +8 more
doaj   +1 more source

CHEMICAL ANALYSIS OF ASYMPTOTIC GIANT BRANCH STARS IN M62 [PDF]

, 2015
We have collected UVES-FLAMES high-resolution spectra for a sample of 6 asymptotic giant branch (AGB) and 13 red giant branch (RGB) stars in the Galactic globular cluster (GC) M62 (NGC 6266).
E. Lapenna, A. Mucciarelli, F. Ferraro, L. Origlia, B. Lanzoni, D. Massari, D. Massari, E. Dalessandro   +7 more
semanticscholar   +1 more source

Turbulence of Tropical Cyclones: From Peristrophic to Zonostrophic

Journal of Geophysical Research: Atmospheres, Volume 130, Issue 14, 28 July 2025.
Abstract Cyclostrophic rotation in the core region of tropical cyclones (TCs) imprints a distinct signature upon their turbulence structure. Its intensity is characterized by the radius of maximum wind, Rmw ${R}_{mw}$, and the azimuthal wind velocity at that radius, Umax ${U}_{max}$.
Boris Galperin, Alexander K. Nickerson, Gregory P. King, Jun A. Zhang   +3 more
wiley   +1 more source

A test for asymptotic giant branch evolution theories: Planetary Nebulae in the Large Magellanic Cloud [PDF]

, 2015
We used a new generation of asymptotic giant branch (AGB) stellar models that include dust formation in the stellar winds to find the links between evolutionary models and the observed properties of a homogeneous sample of Large Magellanic Cloud (LMC ...
P. Ventura, L. Stanghellini, F. Dell’Agli, D. A. Garc'ia-Hern'andez, M. Criscienzo   +4 more
semanticscholar   +1 more source

Edge of Chaos Theory Unveils the First and Simplest Ever Reported Hodgkin–Huxley Neuristor

Advanced Electronic Materials, Volume 11, Issue 8, June 2025.
This manuscript presents the first and simplest ever‐reported electrical cell, which leverages one memristor on Edge of Chaos to reproduce the three‐bifurcation cascade, marking the entire life cycle from birth to extinction via All‐to‐None effect of an electrical spike, also referred to as Action Potential, across axon membranes under monotonic ...
Alon Ascoli, Ahmet Samil Demirkol, Ioannis Messaris, Vasilis Ntinas, Dimitris Prousalis, Stefan Slesazeck, Thomas Mikolajick, Fernando Corinto, Michele Bonnin, Marco Gilli, Pier Paolo Civalleri, Ronald Tetzlaff, Leon Chua   +12 more
wiley   +1 more source

Evidence of Third Dredge-up in Post-AGB Stars in Galactic Globular Clusters

The Astrophysical Journal
To better understand the mixing and mass loss experienced by low-mass stars as they ascend the asymptotic giant branch (AGB), I have gathered from the literature the abundances of CNO and s -process elements in post-AGB stars in Galactic globular ...
William V. Dixon
doaj   +1 more source