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60 papers · 1 filter
Rotation and surface abundance peculiarities in A-type stars
Yoichi Takeda, Inwoo Han, Dong-Il Kang +2
In an attempt of clarifying the connection between the photospheric abundance anomalies and the stellar rotation as well as of exploring the nature of "normal A" stars, the abundan…
Microlensing Optical Depth Revisited with Recent Star Counts
Yoon-Hyun Ryu, Heon-Young Chang, Myeong-Gu Park +1
More reliable constraints on the microlensing optical depth comes from a better understanding of the Galactic model. Based on well-constrained Galactic bulge and disk models constr…
Limits of Binaries That Can Be Characterized by Gravitational Microlensing
Doeon Kim, Yoon-Hyun Ryu, Byeong-Gon Park +5
Due to the high efficiency of planet detections, current microlensing planet searches focus on high-magnification events. High-magnification events are sensitive to remote binary c…
Precise Radial Velocities of Polaris: Detection of Amplitude Growth
Byeong-Cheol Lee, David. E. Mkrtichian, Inwoo Han +2
We present a first results from a long-term program of a radial velocity study of Cepheid Polaris (F7 Ib) aimed to find amplitude and period of pulsations and nature of secondary p…
Seoul National University Bright Quasar Survey in Optical (SNUQSO) I: First Phase Observations and Results
Induk Lee, Myungshin Im, Minjin Kim +7
We present results from the first phase of the Seoul National University Bright Quasar Survey in Optical (SNUQSO) as well as its basic observational setup. Previous and current lar…
Direction-Dependent CMB Power Spectrum and Statistical Anisotropy from Noncommutative Geometry
Earnest Akofor, A. P. Balachandran, Sang G. Jo +2
Modern cosmology has now emerged as a testing ground for theories beyond the standard model of particle physics. In this paper, we consider quantum fluctuations of the inflaton sca…