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The Good, the Bad, and the Ugly

The Good, the Bad, and the Ugly. 1 B. Lim, 1 H. Sung, 1 Y. Shin 2 M. S. Bessell , 3 R. Karimov , and 3 M. Ibrahimov. 1 ARCSEC, SJU, Korea 2 RSAA, ANU, Australia 3 UBAI, Uzbekistan. Open Clusters (OCs)?. A group of stars (Stellar systems). The same origin.

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The Good, the Bad, and the Ugly

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  1. The Good, the Bad, and the Ugly 1B. Lim, 1H. Sung, 1Y. Shin 2M. S. Bessell, 3R. Karimov, and 3M. Ibrahimov 1ARCSEC, SJU, Korea 2RSAA, ANU, Australia 3UBAI, Uzbekistan

  2. Open Clusters (OCs)? A group of stars (Stellar systems) The same origin Almost same distance, age, chemical composition, kinematical properties, etc Distribute in the disk of the Galaxy The number of members - Several 10~ 1000 stars

  3. Why are open clusters important? • From the viewpoint of near-field cosmology • Formation of the disks of the Galaxy • Chemical evolution of the disks relating to the star formation history in the Galaxy • From the viewpoint of stellar astronomy • Stellar evolution • Stellar initial mass function • Massive star formation • Dynamical evolution

  4. SOS (Sejong Open clusters Survey) • Main targets: Clusters in the northern hemisphere • Photometric analysis based on • Lim et al. (2008): the characteristics of CCD system • Lim et al. (2009): Standard transformation • The fundamental parameters of OCs • Reddening, Distance, Size, Age, Stellar mass distribution (the initial mass function) • Importance of this project • Providing very homogeneous photometric data ! ! !

  5. How many data have we obtained? For priority 0, 1

  6. Some Results Pismis Moreno 1

  7. The Good NGC 1624 <E(B-V )>=0.87±0.03 Distance ~ 5.5 kpc Age (log t) ~ 6.70 NGC 2353 <E(B-V )>=0.10±0.04 Distance ~ 1.2 kpc Age (log t) ~ 8.35 Young and intermediate age

  8. The BAD Berkeley 44 <E(B-V )>=1.05±0.05 Distance ~ 2.2 kpc Age (log t) ~ 9.05 Old age

  9. The UGLY Tombaugh 4 Is it real? Or fake? Alessi 14

  10. Conclusion • Systematic analysis based on homogeneous data for open clusterscan tell us important information on the formation history of the Galaxy and stellar astronomy • SOS project • Providing homogeneous photometric data • Systematic analysis for • Young and intermediate age (the good) • Old age (the bad) • Fake clusters? (the ugly)

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