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Browsing by Author "Alladin, S. M"

Browsing by Author "Alladin, S. M"

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  • Classification of colliding galaxies 
    Narasimhan, K. S. V. S; Sastry, K. S; Alladin, S. M (Astronomical Society of India, 1996)
    we propose a classification scheme for colliding galaxies based on the fractional changes in their binding energy and the orbital energy. We give examples of actual observed pairs of interacting galaxies for the various ...
  • Classification of colliding galaxies - II 
    Narasimhan, K. S. V. S; Alladin, S. M; Sastry, K. S (Astronomical Society of India, 2000)
    In our Paper I we had classified galaxies in increasing order of the intensity of tidal effects on the basis of transfer of energy from the motion of galaxies to the internal motions. This work has been refined by presenting ...
  • Energy Loss due to Gravitational Radiation in Galaxy Mergers 
    Sivaram, C; Alladin, S. M (Astronomical Society of Indian, 1986-12)
  • Escape velocities of interacting galaxies in Hernquist's model 
    Narasimhan, K. S. V. S; Alladin, S. M; Sastry, K. S (Astronomical Society of India, 1999)
  • Escape velocities of interacting spherical galaxies 
    Sastry, Shankara. K; Alladin, S. M (Astronomical Society of India, 1981-09)
    The dependence of the escape velocity of a pair of interacting identical spherical galaxies on their separation is studied using polyropic models for the galaxies. It is found that if the escape (parabolic) velocity of the ...
  • Evolution of Viscous Discs 
    Alladin, S. M (Astronomical Society of India, 1975-09)
  • Fluctuations in Moon's period and its relationship with the perigees of the Moon and the Sun 
    Ballabh, G. M; Alladin, S. M (Astronomical Society of India, 2002-09)
    Just as the regression of the nodes of the lunar orbit is connected with the periodicity in the eclipse phenomenon, the advance of perigee is connected with the periodicity in the fluctuations of Moon's synodic period. ...
  • Gravitational Interactions Between Galaxies 
    Alladin, S. M (Astronomical Society of India, 1975-03)
  • The merger time of binary globular clusters 
    Ballabh, G. M; Alladin, S. M (Astronomical Society of India, 2000)
    In a binary globular cluster the tidal forces increase the internal energy of the clusters and may lead to either merger or disruption of a cluster depending upon whether the two clusters are !of equal mass or vary much ...
  • Merging Galaxies 
    Alladin, S. M (Astronomical Society of India, 1978-06)
  • My life as an astronomer 
    Alladin, S. M (Astronomical Society of India, 1997)
    Factors which motivated me to pursue Astronomy are discussed. Dynamics of galaxies has been the principal area of my research. Work done by me and my associates in this field is indicated. Our work on frequency of occurrence ...
  • On the Formation of Bridges and Tails in Interacting Galaxies - II 
    Namboodiri, P. M. S; Kochhar, R. K; Alladin, S. M (Astronomical Society of Indian, 1987-12)
  • Report on the I. A. U. Symposium No. 69 
    Alladin, S. M (Astronomical Society of India, 1974-12)
  • Scattering in a parabolic encounter of a single star with a circular binary 
    Hasan, S. N; Tagare, S. G; Alladin, S. M (Astronomical Society of India, 2000)
    Huang and Valtonen (1987) obtained an analytic expression for the energy transfer in a parabolic encounter of a single star with a circular binary keeping terms of the first order in a/q where a is the radius of the circular ...
  • Stellar Velocity Perturbations in colliding Galaxies II 
    Narasimhan, K. S. V. S; Alladin, S. M (Astronomical Society of India, 1983-09)
    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.
  • Tidal disruption and tidal coalescence in binary stellar systems 
    Alladin, S. M; Parthasarathy, M (Royal Astronomical Society, 1978-09)
    Tidal effects in binary stellar systems are considered. The rate of increase of the binding energy of a component and the rate of decrease of the energy of the orbital motion of the binary are estimated under the simplifying ...
  • Tidal disruption in colliding galaxies 
    Narasimhan, K. S. V. S; Alladin, S. M (Astronomical Society of India, 1982-09)
    Distruptive effects in colliding galaxies due to their mutual tidal interaction are compared under the impulsive approximation. If M1 and M2 are the masses and Rho1 and Rho2 the densities of the two galaxies, M2 suffers ...
  • Tidal disruption model for the interacting pair of galaxies VV 117 (NGC 2444/45) 
    Narasimhan, K. S. V. S; Namboodiri, P. M. S; Alladin, S. M (Springer, 2003-09)
    A series of N-body simulations have been performed to interpret the interacting pair of galaxies VV 117 (NGC 2444/45). The galaxies have been modelled assuming a mass ratio two. The simulations use various values for the ...
  • A Tidal model for the inetracting pair of galaxies VV 117 
    Narasimhan, K. S. V. S; Alladin, S. M (Astronomical Society of India, 1985-12)
    Limber`s (1965) tidal model for the interacting pair of galaxies VV 117 ( = Arp 143 = NGC 2444-45) is improved upon in the light of subsequent H I observations. It is proposed that the spiral Sc component is being disrupted ...
  • Tidal transfer of energy and angular momentum to spheroidal galaxies 
    Som Sunder, G; Kochhar, R. K; Alladin, S. M (Royal Astronomical Society, 1990-06)
    The tidal transfer of energy and angular momentum to a spheriodal test galaxy is studied using tensor virial equations within the framework of impulse approximation. The tidally introduced angular momentum is always along ...

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