1. Aryabhatta Research Institute of Observational Sciences (ARIES), Manora Peak, Nainital 263002, India
2. Department of Physics, Deen Dayal Upadhyaya Gorakhpur University, Gorakhpur 273009, India
3. Indian Institute of Astrophysics, Koramangla, Bangalore 560034, India
4. Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, China
5. Kumaun University, Nainital 263002, India
6. Department of Physics and Astronomical Sciences, Central University of Himachal Pradesh (CUHP), Dharamshala 176215, India
7. Department of Physics, The College of New Jersey, PO Box 7718, Ewing, NJ 08628-0718, USA
8. Department of Astronomy, School of Physics, Peking University, Beijing 100871, China