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)= ...

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 ...

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 ...

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 ...

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 ...

Observations of galaxies show that in the nearby universe we see that approximately 2/3 of the disk galaxies are barred ones (Eskridge et al., 2000). The formation and evolution scenarios of bars are mainly studied with ...

The thesis, in general aims at studying the early history of the Milkyway through the chemical abundances of metal poor stars in the Halo and in the satellite galaxies of the Milkyway. Halo of a galaxy is one of the early ...

Solar atmosphere is stratified and exhibits dynamic structures with confined hot plasmas. The corona consists of dynamic magnetic structures, in the form of closed and open loops with an enhanced plasma density. Moreover, ...