Affiliation: | 1. Ankara University, Faculty of Science, Department of Astronomy and Space Sciences, TR-06100, Tando?an, Ankara, Turkey;2. Istituto Nazionale di Astrofisica-Osservatorio Astronomico di Trieste, via G.B. Tiepolo, 11, I-34143 Trieste, Italy;3. Department of Physics, The Citadel, 171 Moultrie Street, Charleston, SC 29409, United States;4. Visiting Astronomer, Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 W. Saanich Road, Victoria, Canada V8X 4M6;5. Department of Physics and Astronomy, Brandon University, Brandon, Canada MB R7A 6A9 |