It is shown that steady part of rotation in the Sun's convective envelope (CE) and radiative core (RC)can be determined as an analytical solution of the diffusion equation in an incompressible medium of constant diffusivity. ...

Using our data along with the photometric data available from the literature, we have made extensive analysis of the light variations of UX Ari. The parametric study of the photometric data for the last 22 years in the ...

An analytical relationship is obtained between the stellar velocity perturbations and the eccentricity of the galactic orbit, under the impulsive approximation, for a hyperbolic encounter between two spherical galaxies.

The achievements and shortcomings of the standard hot big bang models of the universe are reviewed. The achievements lie in the predictions of the expanding universe, the abundances of light nuclei, and the MW background. ...

The nature of small-scale magnetic fields in the solar atmosphere is discussed. In the first part of the review, equilibrium models for the structure of magnetic flux tubes are presented. It is shown that the thermodynamic ...

This thesis is on the framework of the "NainiTal-Cape Survey" programme for searching photometric variability in chemically peculiar stars, initiated in 1997 at the ARIES, NainiTal, India, in collaboration with the South ...

The upcoming TAUVEX mission is expected to provide us with high quality data from observations over large parts of the sky in different wavelength bands. We propose to use this data for the study of diffuse radiation field ...

We present a detailed study of four young open star clusters and two OB associations using deep CCD U B V R I and 2MASS J H Ks measurements. Physical parameters of the clusters have been estimated using optical as well as ...