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Photometry of M22 globular cluster

Photometry of M22 globular cluster. Analisa Calamida Gabriel Stöckle Jovan Aleksic. Data access. Why M22? Peculiar Galactic Globular Cluster with possible metallicity spread (multiple stellar populations?)

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Photometry of M22 globular cluster

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  1. Photometry of M22 globular cluster Analisa Calamida Gabriel Stöckle Jovan Aleksic

  2. Data access • Why M22? Peculiar Galactic Globular Cluster with possible metallicity spread (multiple stellar populations?) • Astrometric solution needed to cross- correlate own observations with available data

  3. Astrometry • Aladin (Sexctractor, filters) • Topcat (Calculated columns,…)

  4. Cross Correlation • Aladin: • Import 2MASS(J,H,K) + WFI-2.2m (B,V,I) data to Aladin • Cross Correlate • Export to • TOPCAT • Retrieve Isochrones (BASTI) • Plot CMDs

  5. Conclusions about VO - Astrometric solution not feasible -> buggy! - BUT: Data analysis inside VO produces very fast reliable results!

  6. Future scientific work - cross-correlate with more bands -> better color/temperature sensitivity - cross-correlate with spectra to characterize peculiar stars

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