Yong-Woo Kang

Raman-scattered He II Line in the Planetary Nebula M2-9 and in the Symbiotic Stars RR Telescopii and He 2-106

In this Letter, we report the detection of an emission feature around 6545 \AA in the spectra of the bipolar planetary nebula M2-9 and the symbiotic stars RR Telescopii and He 2-106 and propose to identify it as the He II Raman scattered feature. This feature was predicted by Nussbaumer, Schmid & Vogel (1989), who suggested that it is formed through Raman scattering by atomic hydrogen of He II

A DESIGN AND DEVELOPMENT OF MULTI-PURPOSE CCD CAMERA SYSTEM WITH THERMOELECTRIC COOLING II. SOFTWARE

n=6\to n=2

ALGORITHMS FOR MOVING OBJECT DETECTION: YSTAR-NEOPAT SURVEY PROGRAM

photons with slightly shorter wavelength than that of Ly

AUTOMATED STREAK DETECTION FOR HIGH VELOCITY OBJECTS: TEST WITH YSTAR-NEOPAT IMAGES

\beta

OPTICAL PROPERTY AND ALIGNMENT OF KAO WIDE FIELD TELESCOPE (NEOPAT-3)

. The scattering cross section

Design of a Multi-CCD Controller

\sim 10^{-20}{\rm cm^2}

YSTAR: Yonsei Survey Telescopes for Astronomical Research

for this process implies the existence of a neutral hydrogen component with a column density

YSTAR Experiments for Optical Transients

N_{HI}\sim 10^{20}{\rm cm^{-2}}

Algorithms for Moving Object Detection

around the He II emission regions in these objects, which are believed to be associated with the mass loss process in the late stage of stellar evolution. Brief discussions on the astrophysical implications of Raman scattering in these objects are presented.

Fast Optical Transients from YSTAR

We present a software which we developed for the multi-purpose CCD camera. This software can be used on the all 3 types of CCD - KAF-0401E (), KAF-1602E (), KAF-3200E () made in KODAK Co.. For the efficient CCD camera control, the software is operated with two independent processes of the CCD control program and the temperature/shutter operation program. This software is designed to fully automatic operation as well as manually operation under LINUX system, and is controled by LINUX user signal procedure. We plan to use this software for all sky survey system and also night sky monitoring and sky observation. As our results, the read-out time of each CCD are about 15sec, 64sec, 134sec for KAF-0401E, KAF-1602E, KAF-3200E., because these time are limited by the data transmission speed of parallel port. For larger format CCD, the data transmission is required more high speed. we are considering this control software to one using USB port for high speed data transmission.