5 papers
Synthetic Color-Magnitude Diagrams for omega Centauri and Other Massive Globular Clusters with Multiple Populations
Chang H. Ree, Suk-Jin Yoon, Soo-Chang Rey +1
We have constructed synthetic color-magnitude diagrams (CMDs) for omega Cen and other massive globular clusters with apparently peculiar CMD morphology. Our population models, whic…
Omega Centauri as a Disrupted Dwarf Galaxy: Evidence from Multiple Stellar Populations
Young-Wook Lee, Soo-Chang Rey, Chang H. Ree +4
Our recent CCD photometry (Lee et al. 1999) has shown, for the first time, that omega Cen has several distinct stellar populations, which is reminiscent of the Sagittarius dwarf ga…
A New Distance Estimator and Spatial Distribution of GRBS Observed by BATSE
Heon-Young Chang, Suk-Jin Yoon, Chul-Sung Choi
We propose a redshift estimator for the long () gamma-ray bursts (GRBs) observed by the BATSE. It is based on an empirical relation between the redshift and the power-…
Horizontal-Branch Morphology as an Age Indicator
Young-Wook Lee, Suk-Jin Yoon, Soo-Chang Rey +1
We present our recent revision of model constructions for the horizontal-branch (HB) morphology of globular clusters, which suggests the HB morphology is more sensitive to age comp…
Horizontal-Branch Stars as an Age Indicator
Young-Wook Lee, Suk-Jin Yoon, Hyun-chul Lee +1
Surface temperature distribution of horizontal-branch (HB) stars is very sensitive to age in old stellar systems, which makes it an attractive age indicator. In this paper, we pres…