1. Monterey Institute for Research in Astronomy (MIRA) , 200 Eighth Street, Marina, CA 93933, USA
2. Astronomy & Astrophysics Division, Physical Research Laboratory , Navrangapura, Ahmedabad 380009, India
3. Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak , Nainital 263002, India
4. Institute of Astronomy, Russian Academy of Sciences , ul. Pyatniskaya 48, Moscow 119017, Russia