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Determination of the Distance to M33 Based on the Tip of the Red Giant Branch and the Red Clump
Minsun Kim, Eunhyeuk Kim, Myung Gyoon Lee +2
We have determined the distance to M33 using the tip of the red giant branch (TRGB) and the red clump (RC), from the VI photometry of stars in ten regions of M33 based on HST/WFPC2…
Determination of the Distance to M33 Based on Single Epoch I-band HST Observations of Cepheids
Myung Gyoon Lee, Minsun Kim, Ata Sarajedini +2
We have determined the distance to M33 using single epoch I-band observations of Cepheids based on HST/WFPC2 images of five fields in M33. Combining the HST I-band photometry and t…
HST-WFPC2 Observations of the Star Clusters in the Giant HII Regions of M33
Myung Gyoon Lee, Hong Soo Park, Sang Chul Kim +4
We present a photometric study of the stars in ionizing star clusters embedded in several giant HII regions of M33 (CC93, IC 142, NGC 595, MA2, NGC 604 and NGC 588). Our photometry…
A Comparative Study of Globular Cluster Systems in UGC 9799 and NGC 1129
Myung Gyoon Lee, Eunhyeuk Kim, Doug Geisler +2
We present a preliminary analysis of HST-WFPC2 observations of globular cluster systems in the two brightest galaxies, UGC 9799 (cD) and NGC 1129 (non-cD), located in the center of…
New CCD Survey of Globular Clusters in M31
Myung Gyoon Lee, Sang Chul Kim, Doug Geisler +3
We present a progress report of our wide field CCD survey of globular clusters in M31. We have covered 3 deg X 3 deg area centered on M31, using the KPNO 0.9m and Washington CMT1 f…
Surface Photometry of Star Clusters in the Dwarf Elliptical Galaxies NGC 185 and NGC 205
Sang Chul Kim, Myung Gyoon Lee, Doug Geisler +3
We present the surface photometry of star clusters in the nearby dwarf elliptical galaxies NGC 185 and NGC 205, obtained from deep HST WFPC2 F555W (V) and F814W (I) images. We have…
Washington Photometry of New Globular Clusters in M31
Sang Chul Kim, Myung Gyoon Lee, Doug Geisler +3
We present a progress report on Washington photometry of several hundred new globular cluster (GC) candidates in M31 which were recently found from our new CCD survey of GCs. Washi…
Dynamical evolution of rotating stellar systems - II. Post-collapse, equal mass system
Eunhyeuk Kim, Christian Einsel, Hyung Mok Lee +2
We present the first post core collapse models of initially rotating star clusters, using the numerical solution of an orbit-averaged 2D Fokker-Planck equation. Based on the code d…
The Star Formation History of LGS 3
B. W. Miller, A. E. Dolphin, M. G. Lee +2
We have determined the distance and star formation history of the Local Group dwarf galaxy LGS 3 from deep Hubble Space Telescope WFPC2 observations. LGS 3 is intriguing because gr…
Existence of Large Scale Synchrotron X-ray Jets in Radio-loud Active Galactic Nuclei
J. M. Bai, Myung Gyoon Lee
In this paper, analytical arguments are presented that there exists a synchrotron X-ray jet on large scales in most radio-loud AGNs, based on the knowledge of the nature and physic…
Dynamics of the Globular Cluster System Associated with M87 (NGC 4486). II. Analysis
Patrick Cote, Dean E. McLaughlin, David A. Hanes +6
We present a dynamical analysis of the globular cluster system associated with M87 (= NGC 4486), the cD galaxy near the dynamical center of the Virgo cluster. The analysis utilizes…
'Round the Clock Observations of the Q0957+561 A,B Gravitationally Lensed Quasar
Wesley N. Colley, Rudolph E. Schild, Cristina Abajas +20
An observing campaign with 10 participating observatories has undertaken to monitor the optical brightness of the Q0957 gravitationally lensed quasar for 10 consecutive nights in J…
A New SX Phe Star in the Globular Cluster M15
Young-Beom Jeon, Seung-Lee Kim, Ho Lee +1
A new SX Phe star (labelled SXP1) found from CCD photometry is the first to be discovered in the globular cluster M15. It is a blue straggler and is located $102\arcsec.8$ nor…
Are Cen a and M87 Tev Gamma-Ray Sources?
J. M. Bai, Myung Gyoon Lee
In this paper, we identify Cen A and M87, two nearby Fanaroff-Riley I (FRI) radio galaxies, with high-energy-peaked BL Lac-like (HBL-like) objects by investigating their spectral e…