[PDF] Top 20 Populations in old stellar systems

... One further point can be made from our data. We find that the ratio of CN strong to CN weak stars appears to remain constant with luminosity for stars that have evolved beyond My = 1.6 on the GB. If some stars have ... See full document

... the old metal rich (metallicity about twice solar) open cluster NGC6791 have produced a deep LF that displays a sharp cut-off at low luminosities, caused by the finite age of the cluster, plus a secondary peak at ... See full document

... shifts then confirmed in the rest-frame UV using the LRIS-B spectrograph on the Keck I telescope on Mauna Kea. Our total sample of 114 Hα spectra consists of 75 new obser- vations and 39 that have been published ... See full document

... Several recent studies of YSP have been used to estimate the time- scales and order of events for triggering the activity in radio galax- ies. For their sample of three radio galaxies, Tadhunter et al. (2005) found ... See full document

... benchmark systems would be subgiant stars which can provide accurate age and metallicity constraints, and white dwarfs which can give robust lower limits to age, and in the case of high mass white dwarfs (for ... See full document

... young stellar populations (YSPs) in the host galaxies as part of a larger project to investigate evolutionary scenarios for the active galactic nucleus (AGN) host ...the stellar populations in ... See full document

... 6. Stellar mass functions of galaxies in clusters (red) and the field (blue) at ...galaxy populations: SF, PAS and PSB, from left to ...to old (from left to ...the stellar mass functions of ... See full document

... construct stellar mass profiles of observed systems and measure the stellar mass enclosed in a series of physical radii (M ∗ (< R)), for samples of cusp and core spheroids at the same ... See full document

... and stellar population properties of the individual components and how they vary with position, in order to assess their plausibility as discrete elements, and to start to reconstruct their distinct formation ... See full document

... 4 systems being present in the Milky Way (Siegert et ...these systems Sadowski et ...to old stellar ...binary systems evolve into systems composed of a carbon-oxygen ... See full document

... several systems which formed and quenched at different times, then merged to form the most massive quiescent ...these systems were rapidly quenched, however, because their stellar populations ... See full document

... close stellar binaries. In these systems the two stars orbit each other with a few days period, and they rotationally synchronize over time through tidal interaction, ...the stellar rotation period ... See full document

... by stellar winds and supernovae (Chevalier & Clegg 1985; Heckman et ...their stellar populations are not old enough to have produced a substantial number of Wolf-Rayet or AGB stars (which ... See full document

... cluster stellar populations in the Virgo Cluster were derived from HST-ACS observations of ∼ 5300 stars in a single pointing lo- cated between M87, M86, and M84 at 190 kpc distance from M87 (Williams et ... See full document

... and stellar population indices demonstrating the lack of young stellar populations, implying that line emission follows tightly the continuum due to the underlying old stellar ... See full document

... that stellar multiple systems are known to exist in such large numbers in the local Universe suggests that they should not be ignored while constructing ...resolved stellar popula- tion studies in a ... See full document

... young stellar populations depends on the accuracy of the model atmospheres and evolutionary tracks for massive ...input stellar param- eters to reflect current values available in the ... See full document

... of stellar popu- lation properties of galaxies that inhabit such ...greater stellar mass content and longer timescales for star formation than the typical values found in groups outside superclusters, ... See full document

... Several attempts have been made in order to explain the peculiarities of EMP abundance patterns; their origin, nevertheless, is still an unsolved puzzle. One of the first scenarios pro- posed to explain the overabundance ... See full document

... I note however that a number of outstanding problems exist for Λ CDM on the scales of galaxies and galaxy clusters. The first of these is the so-called "missing sattelites problem", in which Λ CDM models predict ... See full document