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The study about the properties of the Gould Belt

Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang- Gak Lee’s Retirement. The study about the properties of the Gould Belt. Keun-Hong Park Seoul National University. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy

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The study about the properties of the Gould Belt

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  1. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement The study about the properties of the Gould Belt Keun-Hong Park Seoul National University

  2. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement 별과 우주(Star & Universe)1999, 11월호

  3. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement 소백산천문대(Sobaeksan Observatory), 2006

  4. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Contents • Introduction • Targets • Result • Study 1: ISM • Study 2: Abundance • Summary

  5. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Introduction • What is the Gould Belt? • Discovered by Herschel and Gould • Ongoing star forming complex • 1 kpc-sized flat structure • Inclined about 20° to Galactic Plane • Early-type stars, open clusters, YSOs… • Several Survey Projects • JCMT Legacy Survey of the Gould Belt Project • The Spitzer survey of interstellar clouds in the Gould Belt • Herschel Gould Belt Survey Project

  6. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Introduction • Similar structures are found in extra-galaxies. • M 83 (NGC 5236) • NGC 6946 • The origin of the Gould Belt is not clear. • The stellar feedback effect? • Impact of a high-velocity clouds? • Impact of a dark matter clump? • Find the clues for the origin in this study

  7. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Introduction • Select nearby young open clusters inside the Gould Belt and the Galactic Plane. • Take the high resolution spectra of the stars in the clusters. • BOES at BOAO • R ~ 45,000 • UVES POP archive data • R ~ 80,000

  8. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Introduction • Study 1: ISM • Measure E.W. of interstellar lines in the spectra of early-type stars and derive column densities. • Find interstellar clouds and their distributions. • Improve our knowledge about the LISM. • Study 2: Abundance • Derive the stellar atmospheric parameters • Derive the abundance from the metal lines.

  9. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Target

  10. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement ISM • Targets • IC 2391 • NGC 6475 • Collinder 70 • IC 4665, Collinder 359, Stephenson 1, Roslund 5 • Lines • Ti II (3383.76 Å) • Ca II (3933.66 Å) • Na I D (5889.95 Å, 5895.92 Å) • K I (7698.96 Å)

  11. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement ISM IC 2391 15km/s

  12. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement ISM IC 2391 15km/s 23km/s

  13. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement ISM IC 2391 (~ 150 pc) Ca II Na I

  14. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement ISM NGC 6475 -3 km/s

  15. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement ISM NGC 6475 -3 km/s

  16. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement ISM NGC 6475 (~300pc) Ca II Na I

  17. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement ISM Collinder 70 25 km/s 11 km/s

  18. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement ISM IC 4665, Collinder 359 -15 km/s

  19. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement ISM Stephenson 1, Roslund 5 -15 km/s

  20. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Abundance • Almost observed target is early-type star. • A few metal lines -> detailed analysis is impossible • Consider non-LTE effect • More study is needed in this part. • Non-LTE effect is ignored in follow examples.

  21. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Abundance • T, gravity : H line profile fitting

  22. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Abundance • Mg

  23. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Abundance • Si

  24. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Abundance • O

  25. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Summary • Gould Belt is one of the most interesting structure • However, origin of it is not investigated. • Aim to find the clues of the origin from this study • Found the ISM clouds and their distributions from the spectra of early-type spectra. • Try to derive the abundance of the stars in each cluster, and to find the existence of the difference between the Gould Belt members and non-members.

  26. Work shop on Stars, Planets, and Life: Current Issues on Stellar Astronomy In Honor of Professor Sang-Gak Lee’s Retirement Thank You

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