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Aspects of Design and Development of a Near Infrared Photometer for Low Altitude Astronomical Sites

Anwesh Kumar, M (Indian Institute of Astrophysics, 2021-01)

In order to fill the void of observation of bright near infrared astronomical sources, we propose a Near Infrared photometer operating from a low latitude astronomical site. As part of this thesis work, design decisions ...

Studies on metal-poor stars and chemical enrichment of the Galaxy

Shejeelammal, J (Indian Institute of Astrophysics, 2022-06)

The low- and intermediate-mass stars are the major inhabitants of our Galaxy. They play an important role in the chemical evolution of the Galaxy. These stars have enriched the ISM with the products of various nucleosynthesis ...

High precision radial velocity studies on VBT echelle spectrograph

Sireesha, C (Indian Institute of Astrophysics, 2019-08)

The Echelle spectrograph operating at Vainu Bappu Telescope (VBT) is a general-purpose instrument designed for high-resolution spectroscopy. It was considered for precision Radial Velocity (RV) measurements without altering ...

Characterizing Solar Eruptions in Inner Corona using Ground and Space-based Data

Ritesh, Patel (Indian Institute of Astrophysics, 2021-08)

The solar corona is known to be associated with eruptions of large amount of magnetized plasma into the interplanetary space. In-spite of several years of ground- and space-based observations of the solar atmosphere, the ...

Optimum design and development of segmented mirror telescope optics and phasing system

Jacob, A (Indian Institute of Astrophysics, 2020-10)

Astronomy today is in the path of constructing large telescopes. Due to several manufacturing and maintenance difficulties, large telescopes of more than 8 m are predominantly segmented. To fulfill the need for its growing ...

Study of the shape and alignment of lensed CMB and large scale structure inferred from the CMB using Minkowski Tensors

Goyal, Priya (Indian Institute of Astrophysics, 2021-08)

The large scale structure in the universe causes arcminute angular scale deflections of the paths of CMB photons, leading to blurring of the acoustic peaks and correlations between different modes. This effect can be ...

Panchromatic study of star clusters: binaries, blue lurkers, blue stragglers and membership

Jadhav, Vikrant V (Indian Institute of Astrophysics, 2022-03-09)

Observation and characterization of extra-solar planets using Indian facilities

Chakrabarty, Aritra (Indian Institute of Astrophysics, 2020-09)

Detection and characterization of extra-solar planets (also known as exoplanets) is an emerging field that has been constantly evolving with the advent of new cutting-edge observational techniques and the development of ...

Understanding of Li production and its evolution in evolved stars

Singh, Raghubar (Indian Institute of Astrophysics, 2021-07)

Lithium (Li) is susceptible to relatively low temperatures. Hence, Li abundances among red giants are expected to be depleted signi cantly, by a factor of 40-60, from its original value on the main sequence. Assuming A(Li)= ...

Echo mapping of active galactic nuclei

Amit Kumar Mandal (Indian Institute of Astrophysics, 2021-06)

Active galactic nuclei (AGN) are the persistent high luminosity sources powered by accretion of matter onto super massive black holes (SMBHs) at their centres. They are known to show flux variation and this property can ...

Investigation of the evolution of dark clouds

Sharma, Ekta (Indian Institute of Astrophysics, 2020-11)

Stars form in the densest regions of molecular clouds which are actually gravitationally unstable cores that resides at the junction of filaments. Before the onset of the gravitational collapse in cores, the build up of ...

Studies of Helium-rich and Hydrogen-deficient stars to explain their origin and evolution

Bhowmick, A (Indian Institute of Astrophysics, 2020-12)

The existence of hydrogen-deficient stars in a hydrogen-dominated universe in itself, sparks a considerable curiosity to explore their origin and evolution. Very rare in nature, the peculiar characteristics of these ...

The pulsar radio emission and polarization

Roy, Tridib (Indian Institute of Astrophysics, 2020-06)

The thesis is mainly focused on the modeling of pulsar radio emission and polarization. The radio emission mechanism of pulsar is not fully understood, because of the lack of understanding about the kinematical processes ...

Multiwavelength studies of nova systems

Pavana, M (Indian Institute of Astrophysics, 2020-09)

Novae are interacting binary star systems consisting of a Roche-lobe filling secondary on or near the main sequence, losing hydrogen-rich material through the inner-Lagrangian point onto an accretion disc surrounding the ...

Relativistic dynamics in black hole systems and implications for observations

Prerna Rana (Indian Institute of Astrophysics, 2020-08)

Scattering theory and radiative transfer in spherically symmetric moving atmospheres

Megha, A (Indian Institute of Astrophysics, 2020-05)

Magnetic fields are ubiquitous in astrophysical plasmas. They are responsible for most of the stellar activities and they manifest in numerous ways in the stellar atmospheres. The Sun being our nearest star is the natural ...

The optical-GeV connection in fermi blazars

Bhoomika (Indian Institute of Astrophysics, 2020-07)

Blazars are a class of active galactic nuclei (AGN) that have relativistic jets that are oriented close to the observers line of sight. They display ux variability across the en- tire accessible electromagnetic spectrum ...

Design and development of closed-loop AO system for 2-m class telescope at IIA

Satya Ranjan Behera (Indian Institute of Astrophysics, 2020)

Adaptive Optics (AO) is a real time wave-front correction technique, through which the light coming from the stars can be corrected for the effects of atmospheric turbulence. This enables the ground based telescope to reach ...

Cosmic Evolution of Black Holes and the M.—σ relation

Bhattacharyya, Dipanweeta (Indian Institute of Astrophysics, 2020-01)

The connection of the SMBHs to their host galaxies is evidenced by the strong correlation between the mass of SMBH and velocity dispersion, σ, of the stars in rest of the galaxy. This is somewhat surprising because the ...

Development of High Resolution System for Stellar Imaging

Sreekanth Reddy, V (Indian Institute of Astrophysics, 2021-01)

Adaptive Optics (AO) technology is a part of ground-based astronomical observatories around the world. It enables the telescopes to attain near diffraction-limited resolution. We have designed, developed and tested a ...

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