IIAP Ph.D.Theses: Recent submissions

  • Development of UV Astronomical Instruments for Balloon and Space Payloads 
    Sarpotdar, Mayuresh N (Indian Institute of Astrophysics, 2018-10)
    At Indian Institute of Astrophysics, we conduct high altitude balloon ex- periments for atmospheric and astronomical observations in UV wavelength range. To carry out observations of astronomical sources, a fine pointing ...
  • Observational studies of low redshift supernovae 
    Srivastav, S (Indian Institute of Astrophysics, 2017-02)
    Supernovae (SNe) are explosive transient events that mark the end stage of stellar evolution. This work presents a study of low redshift, hydrogen deficient (Type I) SNe, with emphasis on SNe of type Ia. The data were ...
  • Multiwavelength study of old open clusters: NGC 188 and M67 
    Sindhu, N (Indian Institute of Astrophysics, 2019-08)
    The thesis focuses on understanding the single and binary stellar evolution in the old open clusters, M67 and NGC 188 using multiwavelength photometric data. We have used images from the Ultra-Violet Imaging Telescope ...
  • Study of solar chromosphere: Variation of Calcium K line profiles with solar cycle 
    Sindhuja, G (Indian Institute of Astrophysics, 2015-07)
    The various features on the solar surface like sunspots, plages, network, active network play a main role in the solar variability. This thesis uses observations which were started in an effort to delineate the role of ...
  • Characterizing image quality of solar ultraviolet imaging telescope on board Aditya L1- mission and long- term study of the sun 
    Chatterjee, Subhamoy (Indian Institute of Astrophysics, 2019-03)
    Spatially resolved solar near ultraviolet (NUV, 200-400 nm) observation is important to understand the coupling between different layers of solar atmosphere and its impact on Earth’s climate. Again, solar features in NUV ...
  • General physical characteristics of Gamma-ray emitting beamed AGNs in fermi era. 
    Paliya, Vaidehi S (Indian Institute of Astrophysics, 2016-08)
    The research work presented in this thesis is aimed to provide a detailed under- standing of the radiative processes powering the jets of the blazars, a class of AGNs with jet pointed towards the line of sight to the ...
  • Multi-wavelength study of waves and solar atmospheric magneto-seismology 
    Mandal, Sudip (Indian Institute of Astrophysics, 2018-07)
    Corona, the outermost layer of the solar atmosphere, is made up with very hot and taneous plasma material. The density and temperature structuring of this layer, is largely inhomogenous. Temperatures, at certain locations, ...
  • Development of instruments for astronomical site characterization and their application 
    Tarun Kumar Sharma (Indian Institute of Astrophysics, 2016)
    Before setting up any large observational facility, selection of a suitable site is an important task. It requires a variety of site survey instruments, which helps to carry out a detailed comparative study of candidate ...
  • Determination of H0 through monitoring of gravitationally lensed quasars 
    Rathna Kumar, S (Indian Institute of Astrophysics, 2014-04)
    Cosmology is the study of the universe as a whole, in particular its physical origin and evolution. According to the current understanding, the universe came into existence some 13.7 billion years ago in a Big Bang (a ...
  • Radio polarization studies of the solar corona at low frequencies 
    Sasikumar Raja, K (Indian Institute of Astrophysics, 2014-10)
    The radio telescopes that are presently in operation specifically to study the Sun are limited. We have: (1) the Nobeyama radioheliograph in Japan operating at 17 and 34 GHz; (2) the Nan¸cay radioheliograph in France ...
  • Studies on Carbon-Enhanced Metal-Poor (CEMP) stars 
    Drisya, K (Indian Institute of Astrophysics, 2015-03)
    Chemical composition of metal-poor stars are crucial to develop an understanding of the nature of the earliest stars formed in the universe, the nucleosynthesis events associated with them, as well as, to redefine the ...
  • Scattering polarization with Paschen-Back effect as a tool to diagnose the magnetic structuring of the solar atmosphere 
    Sowmya, K (Indian Institute of Astrophysics, 2016-03)
    The Sun is a unique physical laboratory in which the various domains of physics inaccessible to laboratories on earth can be studied in great detail. Its proximity allows us to understand it in great depths. George Ellery ...
  • Exploration of the second solar spectrum through polarimetric studies 
    Supriya, H. D (Indian Institute of Astrophysics, 2016-03)
    The discovery of Zeeman effect opened a new window to observe the Sun. It enabled to understand the magnetic field which is one of the basic features that govern different physical processes on the Sun. These magnetic ...
  • Magnetoconvective flows and waves in the lower solar atmosphere 
    Sangeetha, C. R (Indian Institute of Astrophysics, 2017-01)
    Sun has complex magnetic features like sunspots, magnetic bright points, plages, network fields, filaments, etc. These complex magnetic features are found to be associated with various observed dynamical phenomenons like ...
  • On the coupling between lower and upper atmosphere of the Sun 
    Samanta, T (Indian Institute of Astrophysics, 2017-01)
    The thesis is focused on the study of the small-scale transients and waves as seen in the different layers of the solar atmosphere and the coupling between the different layers. The unique high resolution data obtained ...
  • Development of detectors for space missions and balloon flights 
    Ambily, S (Indian Institute of Astrophysics, 2018-11)
    We are developing compact astronomical payloads for ultraviolet (UV) observations from CubeSats and high altitude balloons. It is important to have a highly sensitive, low noise detector in the UV region where the ...
  • Abundance patterns of old open clusters as tracers of galactic chemical evolution 
    Reddy, A. B. S (Indian Institute of Astrophysics, 2014-06)
    We have initiated a program to explore the presence of chemical inhomogeneities in the Galactic disk using the open clusters (OCs) as ideal probes. We have obtained high S/N - ratio and high- dispersion echelle spectra ...
  • Study of stellar streams in the galaxy 
    Ramya, P (Indian Institute of Astrophysics, 2014-02)
    Our Galaxy, also called the Milky Way, is a spiral galaxy consisting of three major distinct components: bulge, disc and halo. They differ from each other in their structural as well as kinematical and chemical properties. ...
  • Study of sun-like G stars and their exoplanets 
    Gurumath, S. R (Vellore Institute of Technology and Indian Institute of Astrophysics, 2019-05)
    By employing exoplanetary physical and orbital characteristics, aim of this study is to understand the genesis, dynamics, chemical abundance and magnetic field structure of Sun-like G stars and relationship with their ...
  • Application of polarized line formation theory to the solar spectrum 
    Smitha, H. N (Indian Institute of Astrophysics, 2014-06)
    One of the primary causes for the occurrence of observed features on the Sun is its magnetic field. The traditional way of measuring the solar magnetic fields is through the Zeeman effect. Over the decades, as the precision ...

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