1. Master thesis
Detection of Van Hoof effect in RR Lyrae stars from BOES observation
Spectroscopy for RR Lyrae variables
Target : TT Lyn, RR Leo, & SW Dra
Instruments : 1.8m Telescope with BOES at Bohyunsan optical astronomy observatory
High resolution echelle spectroscopy (R~60000)
Result
Van Hoof effect
Phase lag between hydrogen line and metal lines
Detection of the effect between …
Hydrogen & metal lines
Ca II & other metal lines
Mg I & other metal lines (except TT Lyn)
Hα & other Balmer lines

2. Post Master Spitzer IRAC observations of 30 Doradus complex in the LMC
Archival data(AOR key )
Reduction & Photometry
MOPEX / APEX
Result & Analysis
Detection of young stellar objects(YSOs)
YSOs are associated with the high velocity component of CO J=4-3 emitting clouds
We discovered a cluster of YSOs which indicates a filamentary structure of star formation
Publication
Kim et al., 2007, ApJ, 669, 1003

3. Now I’m doing… Coursework for Ph.D.
Extragalactic globular cluster study
Photometry for the extragalactic GC system
Target : NGC1399(Fornax cluster), M87(Virgo cluster)
Instruments : 4m Blanco telescope with Mosaic II CCD at CTIO
Multi band photometry
U, B, V, & I for NGC1399 GCS
M,T2, & DDO51 for M87 GCS
Result & Analysis for NGC1399
By comparing the number ratio of blue and red GCs in various colors, we found that the color bimodality could not be interpreted as two distinct populations.
We verified that YEPS model can reproduce the variation well.
Our observational study supports the hypothesis of YYL06 on the origin of color bimodality.