Theses: Recent submissions

  • Multiwavelength study of variable stars and star formation in open star 
    Sinha, Tirthendu (ARIES, Nainital, 2023-03-25)
    The evolution of pre-main-sequence (PMS) stars involves a set of complex physical processes such as evolution of circumstellar disks, accretion processes, bipolar jets and outflows, evolution of angular momentum etc. Because ...
  • Unveiling diverse nature of core collapse supernovae 
    Aryan, Amar (ARIES, Nainital, 2023-12)
    Core-collapse supernovae (CCSNe) are catastrophic astrophysical phenomena that occur during the last evolutionary stages of massive stars having initial masses ≳ 8 M⊙. These catastrophic events play a pivotal role in ...
  • Multi-wavelength study of hot stellar population in Galactic Globular Clusters 
    Singh, Gaurav (ARIES, Nainital, 2023-02-25)
    We present the multi-wavelength study of the hot stellar population in Galactic Globular clusters (GGCs). The population of interest in GCs is Blue straggler stars (BSSs) and the extreme end of the hor izontal branch ...
  • Dust Properties Towards Galactic Anti-Center Direction 
    Singh, Sadhana (ARIES, Nainital, 2023-06-11)
    The starlight passing through the interstellar medium becomes linearly polarized due to the differential extinction from the alignment of asymmetric dust grains in the medium. Both macroscopic and microscopic information ...
  • Multiwavelength Spectro-Photometric Monitoring of Episodically Accreting Young Low-Mass Stars 
    Ghosh, Arpan (ARIES, Nainital, 2023-07-04)
    Episodic accretion in young stellar objects (YSOs) are sudden enhance ment of the accretion rate from the circumstellar disc onto the central pre main sequence (PMS) star. During such episodes of enhanced accretion, it has ...
  • TRANSITIONS AND PERSISTENCE OF BLAZAR STATE IN BEAMED RADIO QUASARS 
    Chand, Krishan (ARIES, Nainital, 2022-12)
    A compact region at the centre of a galaxy known as an active galactic nucleus (AGN) generates a significant amount of energy that is not directly due to stars. It is believed that the accretion of materials onto ...
  • Optical and X-ray Studies of TeV Blazars 
    Dhiman, Vinit (ARIES, Nainital, 2023-10-10)
    Blazars consisting of BL Lacertae objects (BL Lacs; featureless compsite optical/UV spectra) and flat-spectrum radio quasars (FSRQs; promi nent emission lines in composite optical/UV spectra), are the active galactic ...
  • Multiwavelength Observations of Gamma Ray Bursts 
    Gupta, Rahul (ARIES, Nainital, 2023-09)
    Gamma-ray bursts (GRBs) are fascinating sources studied in modern astronomy. They are extremely luminous electromagnetic (Lγ,iso ∼ 1048 − 1054 erg/s) explosions in the Universe observed from cosmological distances. These ...
  • Study on carbonaceous aerosols over the Central Himalayas 
    Srivastava, Priyanka (ARIES, Nainital, 2022-07)
    Tiny particles in the solid, liquid, or mixed phases and suspended in air are known as atmospheric aerosols (Junge, 1963). Despite being minor constituents of the atmosphere, these particles have a profound influence and ...
  • Long-term study of the Sun and its implications to Solar Dynamo Models 
    Jha, Bibhuti Kumar (ARIES, 2022-09)
    The Sun shows a wide range of temporal variations, from a few seconds to decades and even centuries, broadly classi ed into two classes short{term and long{term. The solar dynamo mechanism is believed to be responsible ...
  • Characterizing solar eruptions in inner corona using ground and space-based data 
    Patel, Ritesh (ARIES, Nainital, 2022-08)
    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 groundand space-based observations of the solar atmosphere, the ...
  • Study of the Massive O- and WR-stars and their Associated Winds 
    Arora, Bharti (ARIES, Nainital, 2022-07-04)
    Massive stars (initial mass > 8M⊙) are important objects within a galaxy, impacting their environments via their intense radiation fields as well as dense, supersonic winds and subsequently via supernova explosions. This ...
  • Two-Temperature Solution and Spectral Analysis of Flows Around Compact Objects 
    Sarkar, Shilpa (ARIES, Nainital, 2022-06-02)
    Black holes (BHs) are one of the most exotic objects found in the Universe. They fall into a class of astrophysical objects termed as compact objects. Apart from BHs, neutron stars (NSs) and white dwarfs (WDs) also fall ...
  • Sudy of astrophysical magnetized flows 
    Singh, Kuldeep (ARIES, Nainital, 2021-08)
    A detailed study of magnetized astrophysical ows has been carried out in the magnetohydrodynamic and special relativistic magneto- hydrodynamic regime. We have considered the thermodynamics of the ow to be described ...
  • Astrometric and photometric studies of star clusters 
    Sariya, Devesh Path (ARIES, Nainital, 2015-07)
    Astrometry is the science of studying positions and motions of the celestial objects. Astrometry, by its definition, can be considered to be started with the first naked eye observations of the night sky. Thus, it is one ...
  • Probing the physical state of the intergalactic medium and Quasar environments 
    Jalan, Priyanka (ARIES, Nainital, 2022-02-26)
    Soon after the discovery of the first quasars, a small decrement in the spectrum of a quasar shortward of its Lyα emission line was measured. Recognizing the decrement was due to the Lyα resonance absorption of radiation ...
  • Study of core-collapse supernovae and their progenitors 
    Dastidar, Raya (ARIES, Nainital, 2021-08)
    Supernovae are the cosmic fireworks that mark the death of stars, wherein heavy elements are forged and dispersed, leading to the galactic enrichment of the Universe. In core-collapse supernovae, the collapse of the inert ...
  • Probing Environment of AGNs based on their feedback processes 
    Mishra, Sapna (ARIES, Nainital, 2021-07)
    It is broadly accepted that the presence of a supermassive black hole (SMBH) at the center of an active galaxy is not merely triggering the mass accretion onto it but may play a crucial role in predicting the final ...
  • Observational study of core-collapse supernovae with diminishing hydrogen envelope 
    Gangopadhyay, Anjasha (ARIES, Nainital, 2021-02-08)
    Supernovae (SNe) are the giant stellar explosions that brie y outshines the whole galaxy and enhances chemical enrichment. The thesis highlights a group of SNe with diminishing Hydrogen envelope. This mostly comprises ...
  • Multi-wavelength studies of active galactic nuclei 
    Bhagwan, Jai (ARIES, Nainital, 2017-04-09)
    Blazars comprise a subclass of radio loud Active Galactic Nuclei (AGN) that consist of BL Lacertae objects (BL Lacs) and Flat Spectrum Radio Quasars (FSRQs). They display large amplitude flux and polarization variability ...

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