Results 1 to 10 of about 1,046 (265)

r-process Abundance Patterns in the Globular Cluster M92

The Astrophysical Journal, 2023
Whereas light-element abundance variations are a hallmark of globular clusters, there is little evidence for variations in neutron-capture elements. A significant exception is M15, which shows a star-to-star dispersion in neutron-capture abundances of at
Evan N. Kirby, Alexander P. Ji, Mikhail Kovalev   +2 more
doaj   +1 more source

Variable stars in the globular cluster M 13 [PDF]

Astronomy & Astrophysics, 2003
10 pages, 9 figures, 5 tables, accepted for publication in ...
Kopacki, G., Kolaczkowski, Z., Pigulski, A.   +2 more
openaire   +2 more sources

JWST/NIRCam Probes Young Star Clusters in the Reionization Era Sunrise Arc

The Astrophysical Journal, 2023
Star cluster formation in the early universe and its contribution to reionization remains largely unconstrained to date. Here we present JWST/NIRCam imaging of the most highly magnified galaxy known at z ∼ 6, the Sunrise arc.
Eros Vanzella, Adélaïde Claeyssens, Brian Welch, Angela Adamo, Dan Coe, Jose M. Diego, Guillaume Mahler, Gourav Khullar, Vasily Kokorev, Masamune Oguri, Swara Ravindranath, Lukas J. Furtak, Tiger Yu-Yang Hsiao, Abdurro’uf, Nir Mandelker, Gabriel Brammer, Larry D. Bradley, Maruša Bradač, Christopher J. Conselice, Pratika Dayal, Mario Nonino, Felipe Andrade-Santos, Rogier A. Windhorst, Nor Pirzkal, Keren Sharon, S. E. de Mink, Seiji Fujimoto, Adi Zitrin, Jan J. Eldridge, Colin Norman   +29 more
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Variable stars in the globular cluster M 92 [PDF]

Astronomy & Astrophysics, 2001
AbstractResults of a search for variable stars in the central region of the Oosterhoff II type globular cluster M92 are presented.
openaire   +2 more sources

A JWST Project on 47 Tucanae: NIRSpec Spectroscopy of Multiple Populations among M Dwarfs

The Astrophysical Journal Letters
We present the first spectroscopic estimates of the chemical abundance of M dwarf stars in a globular cluster (GC), namely 47 Tucanae. By exploiting NIRSpec on board the James Webb Space Telescope, we gathered low-resolution spectra for 28 stars with ...
A. F. Marino, A. P. Milone, A. Renzini, E. Dondoglio, E. Bortolan, M. G. Carlos, G. Cordoni, A. Dotter, S. Jang, E. P. Lagioia, M. V. Legnardi, F. Muratore, A. Mohandasan, M. Tailo, T. Ziliotto   +14 more
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Star-crossed Clusters: Asteroseismic Ages for Individual Stars Are in Tension with the Ages of Their Host Clusters

The Astrophysical Journal Letters
A meta-analysis of seismic ages determined for individual stars in the well-studied open and globular clusters NGC 6819, NGC 6791, M67, M4, M19, M80, and M9 reveals both high variance across measurements and a possible discrepancy with independent ...
Jamie Tayar, Meridith Joyce
doaj   +1 more source

Predictions for Self-Pollution in Globular Cluster Stars [PDF]

The Astrophysical Journal, 2001
Full evolutionary models have been built to follow the phases of asymptotic giant branch evolution with mass loss for metal mass fractions from Z=0.0002 to Z=0.004. For the first time, we find that temperatures close to or even larger than 10^8 K are achieved at low Z; the full CNO cycle operates at the base of the envelope, the Oxygen abundance for ...
Ventura P. 1, D'antona F. 2, Mazzitelli I.3, Gratton R. 4   +3 more
openaire   +3 more sources

Rotation and Hα Emission in a Young SMC Cluster: A Spectroscopic View of NGC 330

The Astrophysical Journal
We present an analysis of high-resolution optical spectra recorded for 30 stars of the split extended main-sequence turnoff of the young (∼40 Myr) Small Magellanic Cloud globular cluster NGC 330.
Paul I. Cristofari, Andrea K. Dupree, Antonino P. Milone, Matthew G. Walker, Mario Mateo, Aaron Dotter, John I. Bailey III   +6 more
doaj   +1 more source

Are there S stars in galactic globular clusters? [PDF]

Monthly Notices of the Royal Astronomical Society, 1984
Deux etoiles geantes rouges dans NGC 6723 montrent des bandes ZrO augmentees. Comparaisons avec les geantes de 47 Tuc et analogie avec les etoiles des Nuages de Magellan.
openaire   +1 more source

The Spatial Distribution of Intracluster Globular Clusters in the Fornax Cluster

The Astrophysical Journal
We investigate the spatial distribution of the intracluster globular clusters (ICGCs) detected in the core of the Fornax galaxy cluster. By separately modeling different components of the observed population of globular clusters (GCs), we confirm the ...
Raffaele D’Abrusco, Marco Mirabile, Michele Cantiello, Enrica Iodice, Avinash Chaturvedi, Michael Hilker, Giuseppina Fabbiano, Marilena Spavone, Maurizio Paolillo   +8 more
doaj   +1 more source