Key Laboratory of Optical Astronomy;
National Astronomical Observatories;
Chinese Academy of Sciences;
Beijing 100012;
China;
Space Telescope Science Institute;
3700 San Martin Drive;
Baltimore;
MD 21218;
USA;
Center for Astrophysical Sciences;
Johns Hopkins University;
Baltimore;
MD 21218;
USA;
Department of Physics;
Texas Tech University;
Lubbock;
TX 79409;
USA;
Dipartimento di Fisica e Chimica;
Universita di Palermo;
Piazza del Parlamento 1;
90134 Palermo;
Italy;
INAF/Osservatorio Astronomico di Palermo;
Piazza del Parlamento 1;
90134 Palermo;
Italy;
College of Astronomy and Space Science;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
department of chemistry and physics;
western carolina university;
Cullowhee;
NC 28723;
USA;