A velocity curve of the Wolf-Rayet eclipsing system HD 214419 is obtained from measures on prismatic spectra of the Hell 5411 emission line. The shape of the velocity curve is unlike that obtained for Hell 4686. The emission ...

A numerical method for obtaining solution of radiative transfer equation in spherically symmetric media with spherical harmonic approximation is presented. The angle derivative is approximated by an orthonormal polynomial ...

Simple models of the reflection nebula in the form of homogeneous plane-parallel slab containing single scattering silicate and graphite grains taken one species at a time have been considered in view of the far-ultraviolet ...

A computationally simple method for solving the line transfer in comoving frame has been described for radially expanding spherical medium. We have assumed a radially increasing velocity distribution and a non-LTE (where ...

The effects of large scales gas motions on the radiation pressure in a resonance lines are investigated. We have assumed a medium with pure scattering together with emission in the continuum. A linear velocity law is ...

The radial velocities of 7 Sersic galaxies are reported. Three out of these (NGC 2903, 2997 and 5236) have published radial velocities prior to this work while the radial velocities of four remaining galaxies (NGC 922, ...

As we know, we owe the discovery of solar corona to the observation of total solar eclipse. Inspite of all that has been learned, coronal studies still remain the most important aspect of scientific investigation during ...

The objective of this project was to take intensity and polarization measurements of extended solar coronal streamers, from a height of 75,000 to 80,000 feet above the ground. Hitherto, no observations have been made of ...