Affiliation: | Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Birkenhead, Merseyside CH41 1LD;Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210, USA;Department of Physics, Institute for Basic Science Researches, Chungbuk National University, Chongju 361-763, Korea;Korea Astronomy and Space Science Institute, 61-1, Whaam-Dong, Youseong-Gu, Daejeon 305-348, Korea |