Star Cluster Analyses from Multi-Band Photometry: the Key Advantage of SALT's U-band Sensitivity

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dc.creatorAlvensleben, Uta Fritze - v.
dc.creatorPapaderos, Polychronis
dc.creatorAnders, Peter
dc.creatorLilly, Thomas
dc.creatorCunow, Barbara
dc.creatorGallagher, Jay
dc.date2006-02-06
dc.date.accessioned2026-07-07T06:57:12Z
dc.date.available2026-07-07T06:57:12Z
dc.descriptionConventionally, CMD analyses of nearby star clusters are based on observations in 2 passbands. They are plagued by considerable degeneracies between age, metallicity, distance (and extinction) that can largely be resolved by including additional passbands with U being most appropriate for young SCs and I or a NIR band for old globular clusters. For star clusters that cannot be resolved, integrated photometry in suitably selected passbands was shown to be as accurate as spectroscopy in independently revealing ages, metallicities, internal extinction, and photometric masses and their respective 1 sigma uncertainties, when analysed with a dedicated analysis tool for their Spectral Energy Distributions (SEDs) (cf. Anders et al. 2004a, b, de Grijs et al. 2003b). For external galaxies, rich star cluster populations can thus be efficiently analysed using deep exposures in 4 suitable filters. Again, the inclusion of the U-band significantly reduces the uncertainties in the cluster parameters. The age and metallicity distributions of star cluster systems yield valuable information about the formation history of their parent galaxies (Fritze - v. A. 2004). Here, we present our GALEV evolutionary synthesis models for star clusters of various metallicities (Anders, Fritze - v. A. 2003), recently extended to include the time evolution of CMDs, the dedicated SED Analysis Tool AnalySED we developed, show results on the basis of HST data, and present first data for a young star cluster system in the ongoing spiral-spiral merger NGC 1487 obtained with SALT during the SALTICAM Performance Verification Phase.
dc.descriptionContributed Talk, 7 pages, to appear in IAU Symp. 232, ``The Scientific Requirements for Extremely Large Telescopes'', eds. P. Whitelock, B. Leibundgut, M. Dennefeld, Cambridge Univ. Press
dc.identifierhttps://arxiv.org/abs/astro-ph/0602110
dc.identifierhttp://arxiv.org/abs/astro-ph/0602110
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/106883
dc.subjectAstrophysics
dc.titleStar Cluster Analyses from Multi-Band Photometry: the Key Advantage of SALT's U-band Sensitivity
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