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Browsing by Author "Raghunath, G"

Browsing by Author "Raghunath, G"

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  • Comoving frame calculations with Lorentz profiles in radially expanding media 
    Peraiah, A; Raghunath, G (Indian Institute of Astrophysics, 1979-11)
    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 ...
  • Effects of High Velocities on Photoionization Lines 
    Peraiah, A; Raghunath, G (Indian Academy of Sciences, 1980)
    We have treated formation of spectral lines in a commoving frame where photoionization is predominant over collisional processes. We have assumed that the radiation field for causing photoionization is a function of Planck ...
  • Lines Formed in Slowly Expanding Thin Spherical Shell 
    Peraiah, A; Raghunath, G; Nagendra, K. N (Indian Institute of Astrophysics, Bangalore, 1980)
    We have investigated how an optically thin spherical shell with small velocities change the profiles and equivalent widths of the lines. We have employed several types of variations in density, velocity of expansion and ...
  • Optical depth effects on the formation of spectral lines in rotating and expanding spherical atmospheres 
    Peraiah, A; Raghunath, G; Nagendra, K. N (Indian Academy of Sciences, 1981)
    The effect of high optical depths and large rotational velocities on the spectral lines in rotating and radial expanding spherical shells is investigated. It is assumed that the outer radius of the shell is three times the ...
  • Rotational Effects on line Source Function 
    Peraiah, A; Raghunath, G (Indian Institute of Astrophysics, Bangalore, 1980)
    The effects of rotation are investigated on the source functions in an expanding atmosphere. We have considered a non-LTE two-level atom in an extended atmosphere. We have also made use of von Zeipel`s theorem in giving ...

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