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The SMC star cluster BS 90

The SMC star cluster BS 90. Boyke Rochau. MPIA Student Workshop, Dorio, 2007. Overview. - Location of BS 90. - Structural parameters. - Color-magnitude diagram. - Results. Boyke Rochau. LMC. SMC. The Magellanic Clouds. Location of BS 90. NGC 602. NGC 346 + BS 90 in the SMC.

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The SMC star cluster BS 90

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  1. The SMC star cluster BS 90 Boyke Rochau MPIA Student Workshop, Dorio, 2007

  2. Overview - Location of BS 90 - Structural parameters - Color-magnitude diagram - Results Boyke Rochau

  3. LMC SMC The Magellanic Clouds Location of BS 90

  4. NGC 602 NGC 346 + BS 90 in the SMC Location of BS 90 Boyke Rochau

  5. Centre of BS 90 10 pc N E Location of BS 90 - HST/ACS - Three pointings, centred on NGC 346 Boyke Rochau

  6. EFF model (Elson, Fall & Freeman, 1987): King model (King, 1962): Structural parameters of BS 90 Structure of BS 90 rc : Core radius rt : Tidal radius Boyke Rochau

  7. Best-fitting EFF and King model Structure of BS 90 EFF: Core radius: rc= 5.57 pc King: Core radius: rc= 5.45 pc Tidal radius: rt= 53.7 pc Concentration parameter: c =log(rc/rt) ~ 1.0 Boyke Rochau

  8. 10 pc Area with radius2 rc N E Color-magnitude diagram of BS 90 CMD of the BS 90 Boyke Rochau

  9. Subtraction of contaminating stars CMD of the BS 90 Boyke Rochau

  10. Results from the isochrone fit CMD of the BS 90 Extinction: AV = 0.04 mag Distance modulus: dm = 18.85 mag Distance: ~ 58.9 kpc Age: 4.5 Gyr Metallicity: Z = 0.004 [Fe/H] ~ - 0.72 Boyke Rochau

  11. Core radius-age relation of the SMC Results Age : 4.5 Gyr,Core radius : 5.57 pc Mackey & Gilmore (2003): - Lower branch represents ‘standard’ isolated evolution of a cluster - Upper right group: - external influence - exceptional stellar population Triangles: Mackey & Gilmore (2003) Boyke Rochau

  12. Age-metallicity relation of the SMC Results - ‘age gap’ of the LMC (e.g. Westerlund, 1997; Rich et al., 2001) - few old rich clusters in the SMC - ~ 10 clusters older than 4 Gyr Smith (1999) Boyke Rochau

  13. Results (Chemical enrichment models from: Pagel & Tautvaisiene, 1998) Boyke Rochau

  14. Further results Results - Construction of luminosity and mass function - Radial dependence of the mass function slope indicates mass segregation in BS 90 - The half-mass relaxation time (0.95 Gyr) shows the dynamical origin Boyke Rochau

  15. Bremen Und Schluss! ! (?) Boyke Rochau

  16. Luminosity function Backup Slides Boyke Rochau

  17. Radial dependence of the LF Backup Slides Boyke Rochau

  18. Mass function Backup Slides Boyke Rochau

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