Results 101 to 110 of about 2,000,138 (297)

Neutrino and axion bounds from the globular cluster M5 (NGC 5904). [PDF]

Physical Review Letters, 2013
The red-giant branch (RGB) in globular clusters is extended to larger brightness if the degenerate helium core loses too much energy in "dark channels." Based on a large set of archival observations, we provide high-precision photometry for the Galactic ...
N. Viaux, M. Catelán, P. Stetson, G. Raffelt, J. Redondo, A. Valcarce, A. Weiss   +6 more
semanticscholar   +1 more source

Extragalactic Globular Clusters in the Near-Infrared: V. IC 4051 and NGC 3311

, 2005
We present the results of combined optical and near-infrared photometry for the globular cluster systems of the giant ellipticals IC 4051 and NGC 3311.
Barmby, Baum, Bertin, Brodie, Bruzual, Bruzual, Cohen, D. Geisler, D. W. Hoard, Davies, de Zeeuw, Ferrari, Gebhardt, Geisler, Goudfrooij, Goudfrooij, Grillmair, Harris, Harris, Harris, Hempel, Hempel, Hibbard, Holtzman, Jensen, Jorgensen, Jura, Kent, Kissler-Patig, Kissler-Patig, Kissler-Patig, Kundu, Kundu, Kuntschner, Larsen, Lee, M. Hempel, Maraston, Maraston, Maratson, McLaughlin, McNamara, Mehlert, Mehlert, Mighell, Minniti, Puzia, Puzia, Renzini, Richter, Schlegel, Searle, Secker, Stephens, Thomas, Thomas, Vazdekis, Vazdekis, Västerberg, W. E. Harris, Woodworth, Worthey, Zepf   +62 more
core   +1 more source

Relativistic Binaries in Globular Clusters

Living Reviews in Relativity, 2006
The galactic population of globular clusters are old, dense star systems, with a typical cluster containing 10^4 - 10^7 stars. As an old population of stars, globular clusters contain many collapsed and degenerate objects. As a dense population of stars,
Benacquista Matthew J.
doaj  

Multiperiodic RR Lyrae stars in the field of NGC 6362

EPJ Web of Conferences, 2017
We present frequency analysis of RR Lyrae stars of globular cluster NGC6362.
Moskalik Paweł, Smolec Radosław, Kałużny Janusz, Pych Wojciech, Różyczka Michał, Thompson Ian B.   +5 more
doaj   +1 more source

The Globular Cluster Migratory Origin of Nuclear Star Clusters [PDF]

, 2014
Nuclear Star Clusters (NSCs) are often present in spiral galaxies as well as resolved Stellar Nuclei (SNi) in elliptical galaxies centres. Ever growing observational data indicate the existence of correlations between the properties of these very dense ...
M. Arca-Sedda, R. Capuzzo-Dolcetta
semanticscholar   +1 more source

An age difference of two billion years between a metal-rich and a metal-poor globular cluster [PDF]

Nature, 2013
Globular clusters trace the formation history of the spheroidal components of our Galaxy and other galaxies, which represent the bulk of star formation over the history of the Universe.
Brad M. S. Hansen, J. Kalirai, J. Kalirai, Jay Anderson, A. Dotter, H. Richer, R. Rich, M. Shara, G. Fahlman, J. Hurley, Ivan R. King, D. Reitzel, P. Stetson   +12 more
semanticscholar   +1 more source

Spectroscopy of Globular Clusters in the Sculptor Group Galaxies NGC 253 and NGC 55

, 1999
We have obtained spectra for 103 published globular cluster candidates in the Sculptor Group galaxies NGC 253 and NGC 55. On the basis of radial velocities and digitized plate images, 14 globular clusters are identified in NGC 253 and one probable ...
Beasley, M. A., Sharples, R. M.
core   +1 more source

AL 3 (BH 261): a new globular cluster in the Galaxy [PDF]

, 2006
AL~3 (BH 261), previously classified as a faint open cluster candidate, is shown to be a new globular cluster in the Milky Way, by means of B, V and I Color-Magnitude Diagrams. The main feature of AL~3 is a prominent blue extended Horizontal Branch.
Andrews A. D., B. Barbuy, Barbuy B., Barbuy B., Bica E., Buonanno R., E. Bica, Ortolani S., Ortolani S., Ortolani S., Ortolani S., S. Ortolani   +11 more
core   +2 more sources

A black hole in a globular cluster [PDF]

Nature, 2007
Globular star clusters contain thousands to millions of old stars packed within a region only tens of light years across. Their high stellar densities make it very probable that their member stars will interact or collide. There has been considerable debate about whether black holes should exist in these star clusters.
Stephen E. Zepf, Arunav Kundu, Katherine L. Rhode, Katherine L. Rhode, Thomas J. Maccarone   +4 more
openaire   +5 more sources

Fast-rotating Blue Straggler Stars in the Globular Cluster NGC 3201

The Astrophysical Journal, 2023
We used high-resolution spectra acquired with the Magellan Telescope to measure radial and rotational velocities of approximately 200 stars in the Galactic globular cluster NGC 3201.
Alex Billi, Francesco R. Ferraro, Alessio Mucciarelli, Barbara Lanzoni, Mario Cadelano, Lorenzo Monaco, Mario Mateo, John I. Bailey III, Megan Reiter, Edward W. Olszewski   +9 more
doaj   +1 more source