Results 1 to 10 of about 37,882 (341)

Resolving Globular Cluster Formation within a Cosmological Context [PDF]

, 2009
We place constraints on the formation redshifts for blue globular clusters (BGCs), independent of the details of hydrodynamics and population III star formation.
Aaron C. Boley, Ashman, Bastian, Baumgardt, Bertschinger, Binney, Binney, Bromm, de Angeli, Eisenstein, Fall, George Lake, Gnedin, Gnedin, Greif, Gunn, Harris, Hinshaw, Justin Read, Kravtsov, Levine, Madau, Moore, Nakamura, Romain Teyssier, Sarajedini, Schweizer, Surdin, Tumlinson, Woosley, Zhang   +30 more
core   +2 more sources

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

Massive star archeology in globular clusters [PDF]

Proceedings of the International Astronomical Union, 2014
AbstractGlobular clusters are among the oldest structures in the Universe and they host today low-mass stars and no gas. However, there has been a time when they formed as gaseous objects hosting a large number of short-lived, massive stars. Many details on this early epoch have been depicted recently through unprecedented dissection of low-mass ...
Chantereau, W., Charbonnel, C., Meynet, G.   +2 more
openaire   +4 more sources

The influence of residual gas expulsion on the evolution of the Galactic globular cluster system and the origin of the Population II halo

, 2007
We present new results on the evolution of the mass function of the globular cluster system of the Milky Way, taking the effect of residual gas expulsion into account.
Bastian, Baumgardt, Baumgardt, Baumgardt, Baumgardt, Baumgardt, Binney, Boily, Boily, Boutloukos, Chaboyer, Chandar, Chiba, D'Antona, Dabringhausen, de Grijs, de la Fuente Marcos, Decressin, Decressin, Engargiola, Evstigneeva, Fall, Fall, Freeman, Freyer, Freyer, G. Parmentier, Gieles, Gieles, Gnedin, Goodwin, Gratton, Gratton, Gratton, H. Baumgardt, Harris, Harris, Harris, Hilker, Hills, Innanen, Jórdan, Kavelaars, Kroupa, Kroupa, Kroupa, Kroupa, Kroupa, Kroupa, Kroupa, Kundu, Kundu, Lada, Lamers, Larsen, Larsen, Mackey, McLaughlin, Meylan, Nantais, Okazaki, Ostriker, P. Kroupa, Parmentier, Parmentier, Parmentier, Piotto, Prantzos, Rosolowsky, Secker, Sneden, Solomon, Spitzer, Tamura, Tremaine, van den Bergh, van den Bergh, VandenBerg, Verschueren, Vesperini, Vesperini, Vesperini, Vesperini, Vesperini, Weidner, Weidner, Whitmore, Whitmore, Whitmore, Zhang, Zinn   +90 more
core   +1 more source

The ellipticities of Galactic and LMC globular clusters [PDF]

, 1997
The globular clusters of the LMC are found to be significantly more elliptical than Galactic globular clusters, but very similar in virtually all other respects. The ellipticity of the LMC globular clusters is shown not be correlated with the age or mass
Goodwin, Simon P
core   +2 more sources

Search for variable stars in globular clusters [PDF]

Symposium - International Astronomical Union, 1986
A program to search poorly studied southern globular clusters for variable stars is being carried out on the 1-m Yale telescope at CTIO. Recently two galactic bulge clusters of moderately high metallicity have been found to contain RR Lyrae variables; a cluster of similar metallicity a little farther from the galactic center apparently has none.
openaire   +1 more source

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

The influence of gas expulsion and initial mass-segregation on the stellar mass-function of globular star clusters

, 2008
Recently de Marchi, Paresce & Pulone (2007) studied a sample of twenty globular clusters and found that all clusters with high concentrations have steep stellar mass-functions while clusters with low concentration have comparatively shallow mass ...
D'Agostino R. B., Fukushige T., Gaburov E., Holger Baumgardt, Kroupa P., Kroupa P., Makino J., Michael Marks, Motte F., Pavel Kroupa   +9 more
core   +1 more source

Extremely alpha-Enriched Globular Clusters in Early-Type Galaxies: A Step towards the Dawn of Stellar Populations? [PDF]

, 2006
We compare [alpha/Fe], metallicity, and age distributions of globular clusters in elliptical, lenticular, and spiral galaxies, which we derive from Lick line index measurements.
Markus Kissler‐Patig, Paul Goudfrooij, Thomas H. Puzia, Tornambe A.   +3 more
core   +2 more sources

Field star diffusion in globular clusters [PDF]

Monthly Notices of the Royal Astronomical Society, 1992
A new interaction of globular clusters with galactic field stars, the deceleration (by dynamical friction) of high-velocity field stars diffusing through individual globular clusters, is investigated. This frictional interaction contributes to cluster heating and, in conjunction with disc shocking and other mechanisms, helps to reflate the evolution of
W. Peng, J. C. Weisheit
openaire   +1 more source