1. Department of Physics, University of Kashmir, Srinagar 190006, India
2. Astrophysical Sciences Division, Bhabha Atomic Research Center, Mumbai 400085, India
3. Homi Bhabha National Institute, Mumbai 400094, India
4. Inter-University Center for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune 411007, India
5. Department of Physics, Central University of Kashmir, Ganderbal 191201, India