Results 81 to 90 of about 26,787 (255)

A population of binaries in the Asymptotic Giant Branch of 47 Tucanae? [PDF]

, 2006
We have used a set of archived Hubble Space Telescope/ACS images to probe the evolved populations of the globular cluster 47 Tucanae. We find an excess of Asymptotic Giant Branch (AGB) stars in the cluster core. We interpret this feature as the signature
Barbara Lanzoni, Francesco R. Ferraro, Giacomo Beccari, Giacomo Beccari, Michele Bellazzini   +4 more
core   +2 more sources

Of Biogeography, Fishes and Kelp: Environmental DNA Metabarcoding the Great African Seaforest

Diversity and Distributions, Volume 31, Issue 6, June 2025.
ABSTRACT Aim The biodiversity associated with kelp forest ecosystems is understudied globally, including in South Africa, where kelp forests have expanded their range under climate change. This study used environmental DNA (eDNA) metabarcoding to assess fish biodiversity across an expansive range (~1000 km) of South Africa's kelp forests, contributing ...
Kira‐Lee Courtaillac, Jannes Landschoff, Sophie von der Heyden   +2 more
wiley   +1 more source

Cool, Luminous, and Highly Variable Stars in the Magellanic Clouds. II. Spectroscopic and Environmental Analysis of Thorne–Żytkow Object and Super-AGB Star Candidates

The Astrophysical Journal, 2023
In previous work, we identified a population of 38 cool and luminous variable stars in the Magellanic Clouds and examined 11 in detail in order to classify them as either Thorne–Żytkow objects (TŻOs; red supergiants with a neutron star cores) or super ...
Anna J. G. O‘Grady, Maria R. Drout, B. M. Gaensler, C. S. Kochanek, Kathryn F. Neugent, Carolyn L. Doherty, Joshua S. Speagle, B. J. Shappee, Michael Rauch, Ylva Götberg, Bethany Ludwig, Todd A. Thompson   +11 more
doaj   +1 more source

On the missing second generation AGB stars in NGC 6752 [PDF]

, 2014
In recent years the view of Galactic globular clusters as simple stellar populations has changed dramatically, it is now thought that basically all globular clusters host multiple stellar populations, each with its own chemical abundance pattern and ...
Cassisi, S, Monelli, M, Pietrinferni, A, Salaris, M, Vink, JS   +4 more
core   +2 more sources

Asymptotic giant branch variables as extragalactic distance indicators [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractLarge-amplitude asymptotic giant branch variables potentially rival Cepheid variables as fundamental calibrators of the distance scale, particularly if observations are made in the infrared, or where there is substantial interstellar obscuration.
openaire   +2 more sources

Quantum Batteries: A Materials Science Perspective

Advanced Materials, Volume 37, Issue 17, April 28, 2025.
This perspective is focused on advanced materials that might allow the new device class of quantum batteries to be developed. These systems include microcavities with organic molecules, inorganic nanostructures and perovskites, and superconductor circuits.
Andrea Camposeo, Tersilla Virgili, Floriana Lombardi, Giulio Cerullo, Dario Pisignano, Marco Polini   +5 more
wiley   +1 more source

Spitzer observations of large amplitude variables in the LMC and IC 1613

EPJ Web of Conferences, 2017
The 3.6 and 4.5 ìm characteristics of asymptotic giant branch variables in the LMC and IC 1613 are discussed. For C-rich Mira variables there is a very clear periodluminosity-colour relation, where the [3.6] .
Whitelock Patricia A., Kasliwal Mansi, Boyer Martha   +2 more
doaj   +1 more source

Polarisation of molecular lines in the circumstellar envelope of the post-Asymptotic Giant Branch star OH 17.7-2.0 [PDF]

, 2023
W. H. T. Vlemmings, D. Tafoya
openalex   +1 more source

On the Pre‐ and Post‐Positional Semi‐Random Graph Processes

Journal of Graph Theory, Volume 108, Issue 4, Page 819-831, April 2025.
ABSTRACT We study the semi‐random graph process, and a variant process recently suggested by Nick Wormald. We show that these two processes are asymptotically equally fast in constructing a semi‐random graph G $G$ that has property P ${\mathscr{P}}$, for the following examples of P ${\mathscr{P}}$: (1) P ${\mathscr{P}}$ is the set of graphs containing ...
Pu Gao, Hidde Koerts
wiley   +1 more source

Dusty Stellar Source Classification by Implementing Machine Learning Methods Based on Spectroscopic Observations in the Magellanic Clouds

The Astrophysical Journal
Dusty stellar point sources are a significant stage in stellar evolution and contribute to the metal enrichment of galaxies. These objects can be classified using photometric and spectroscopic observations using color–magnitude diagrams and infrared ...
Sepideh Ghaziasgar, Mahdi Abdollahi, Atefeh Javadi, Jacco Th. van Loon, Iain McDonald, Joana Oliveira, Amirhossein Masoudnezhad, Habib G. Khosroshahi, Bernard H. Foing, Fatemeh Fazel Hesar   +9 more
doaj   +1 more source