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Uta Fritze-von Alvensleben Peter Weilbacher Jens Bicker 《Astrophysics and Space Science》2003,284(2):893-896
To account for the range of stellar metallicities in local galaxies and for the increasing importance of low metallicities
at higher redshift we present chemically consistent models for the spectral and chemical evolution of galaxies over cosmological
timescales. We discuss advantages, limitations and future prospects of our approach.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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Danielle Alloin Carme Gallart Emmanuel Fleurence Emanuela Pompei Daniel Raimann Uta Fritze- Von Alvensleben Sukyoung Yi 《Astrophysics and Space Science》2002,281(1-2):109-113
The goal of this project is to analyze the integrated-light spectrum of a region in the LMC bar, for which HST images are
already available yielding color-magnitude diagrams reaching the oldest main-sequence turnoff. Then, we can derive the star
formation history in this field through evolutionary/population synthesis of the integrated light from 330 to 990 nm by a
variety of independent methods and compare the results with the - in principle - more reliable results derived from the analysis
of the color-magnitude diagram (CMD). This confrontation is the key ‘truth-test’ needed for the understanding of the abilities
and the limitations of the evolutionary/population synthesis methods that must be applied of necessity to unresolved nearby
and far-away galaxies. We report here on the observational part of the project.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
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Peter Anders Uta Fritze-von Alvensleben Richard de Grijs 《Astrophysics and Space Science》2003,284(2):937-940
The observational properties of globular cluster systems (GCSs) are vital tools to investigate the violent star formation
histories of their host galaxies. This violence is thought to have been triggered by galaxy interactions or mergers. The most
basic properties of a GCS are its luminosity function (number of clusters per luminosity bin) and color distributions. A large
number of observed GCS show bimodal color distributions, which can be translated into a bimodality in either metallicity and/or
age. An additional uncertainty comes into play when one considers extinction. These effects can be disentangled either by
obtaining spectroscopic data for the clusters or by imaging observations in at least four passbands. This allows us then to
discriminate between various formation scenarios of GCSs, e.g. the merger scenario by Ashman and Zepf, and the multi-phase
collapse model by Forbes et al. Young and metal-rich star cluster populations are seen to form in interacting and merging
galaxies. We analyse multiwavelength broad-band observations of these young cluster systems provided by the ASTROVIRTEL project.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
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