IIAP Publications: Recent submissions

  • Transient response of the solar wind to changes in flow geometry 
    Hasan, S. S; Venkatakrishnan, P (D.Reidel Publishing Co.,, 1982-10)
    An initial stationary flow in a configuration diverging as r-squared is assumed, a state corresponding to the normal solar wind solution. The effect on the flow through a tube whose area A(r, t) diverges faster than ...
  • Red and blue stars in the direction of the Large Magellanic Cloud 
    Parthasarathy, M (International Astronomical Union, 1978)
    The Large Magellanic Cloud has been surveyed on ultralow dispersion (10,000 A/mm) plates taken with the 102-centimeter reflector at Kavalur. Many new red and blue stars were found. The LMC bar was found to have a strong ...
  • Characteristics of damping of the pulses in the sun 
    Das, G. C (D.Reidel Publishing Co.,, 1981-06)
    Mathematical modelling is used in determining the rotational frequency and the density of an ionized medium. It is noted that the technique derives from the measurement of the group travel time for a wave propagating in a ...
  • CO in the IUE spectrum of Comet Bradfield (1979l) 
    Murty, P. S (D.Reidel Publishing Co.,, 1982-02)
    New identifications are reported of the fourth positive bands and Cameron bands of CO in the IUE satellite spectrum of Comet Bradfield (1979l). Although the predicted band intensities as well as the band identifications ...
  • Unidentified molecular features in the red spectrum (5800 to 7300 Å) of PI Gruis 
    Murty, P. S (D.Reidel Publishing Co.,, 1982-11)
    Moderate dispersion (46 Å mm–1 at H) image-tube spectrum (5800–7300 Å) of the S star 1 Gru is found to exhibit several unidentified molecular features, in addition to the well-known bands of the oxides ofs-process elements. ...
  • Magnetohydrodynamic equilibrium and stability of pre-flare loops - Constant pitch field 
    Hasan, S. S (D. Reidel Publishing Co.,, 1980-08)
    The equilibrium and stability of a loop in which energy storage occurs prior to a solar flare is discussed. Working on the hypothesis, that the onset of the flare begins only after sufficient magnetic energy has been stored ...
  • Radio frequency emission in electron beam-plasma and beam-beam interaction 
    Krishan, V; Sinha, K. P; Krishan, S (D.Reidel Publishing Co.,, 1978-01)
    A linear excitation of electromagnetic modes at frequencies ~_ (n+1/2)ωce , in a plasma through which two electron beams are contra-streaming along the magnetic field is investigated. This may be a source of the observed ...
  • Stellar rotation on the zero age main sequence 
    Rajamohan, R (Royal Astronomical Society, 1978-09)
    Analysis of rotational velocities of unevolved members in clusters indicates that for a given mass the dispersion in the true rotational velocities is small for normal, single main-sequence stars. The envelope of highest ...
  • Pi gruis - molecular identifications and spectral classification 
    Murty, P. S (D.Reidel Publishing Co.,, 1983-08)
    Identifications of the molecular absorption features in the visible spectrum of the S star Pi Gruis are presented. Moderate dispersion spectrum of π/sup1 Gru covering the region 5800-7300 Å, demonstrates the presence of a ...
  • On the relationships between sfe (crochet) and solar X-ray and microwave bursts 
    Sastri, J. H; Murthy, B. S (D.Reidel Publishing Co.,, 1975-04)
    Geomagnetic crochets (sfe) observed at Kodaikanal over the period 1966-71 have been studied in relation to solar X-ray bursts observed by NRL satellite (SOLRAD-9) in the 0.5-3 A, 1-8 A and 8-20 A bands and radio bursts ...
  • Nonlinear analysis of two contra-streaming electron beams - plasma system 
    Krishan, V (D.Reidel Publishing Co.,, 1978-08)
    The nonlinear theory of electromagnetic modes in the radio frequency range, excited from a system consisting of two contra-streaming electron beams, supports the experimental observation that out of w~(n + ½)w/subce,w = ...
  • Upper mass limit for neutron star stability against black hole formation 
    Krishan, V; Kumar, N (D.Reidel Publishing Co.,, 1978-08)
    Starting from the exact general relativistic expression for the total energy of selfgravitating spherically distributed matter and using the minimum energy principle, we calculate the upper mass limit for a neutron star ...
  • New monochromators of concave grating suitable for space telescopes 
    Singh, M (Optical Society of America, 1978)
    Three types of new mono chromators based on the new mounting of concave grating by Singh Majumdar (SM) are described. These mono chromators are very compact and simple in operation, fulfilling the requirements of a mono ...
  • Conductivity of an ion-acoustically turbulent plasma 
    Krishan, V (D.Reidel Publishing Co.,, 1978-09)
    Three different mechanisms are suggested for the non-linear saturation of the ion-acoustic instability. These include the indirect wave-particle interaction, the scattering on density fluctuations and the effects of energy ...
  • Unusual extinction profiles by Rayleigh scattering 
    Shah, G. A (WILEY-VCH Verlag Berlin GmbH & Co, 1977)
    The extinction efficiencies for small smooth metallic particles (granules) have been calculated using rigorous Mie theory of scattering. Strong size-dependent resonances for spheres composed of sodium, potassium, and calcium ...
  • Observations of weak G-band stars 
    Kameswara Rao, N (Royal Astronomical Society, 1978-11)
    Scanner observations of the strengths of the G-band stars of CH at λ4300 and of the NH bands at λ3360 were obtained fro 10 weak G-band stars (wG stars) along with 2 normal field giants of spectral types G to K. the ...
  • Density dependence of solar emission lines of oxygen-like ions 
    Raju, P. K; Dwivedi, B. N (D.Reideal Publishing Co.,, 1978-12)
    Assuming steady state conditions, the occupation of 9 levels of oxygen-like ions: Ne iii, Mg v, Si vii, S ix, and Ar xi have been computed as a function of electron density and temperature. The following physical processes ...
  • A central gravitational redshift model for the absorption redshift systems in quasi-stellar objects 
    Das, P. K (Royal Astronomical Society, 1979-01)
    Static, spherically symmetric configurations of core and envelope type have been considered in General Relativity as central gravitational redshift models for the quasi-stellar objects (QSOs) and an attempt has been made ...
  • Equivalent width of OI λ7774 and absolute magnitude relation for F and G supergiants 
    Kameswara Rao, N; Mallik, S. G. V (Royal Astronomical Society, 1978-04)
    Luminosity calibration is established for F5-G2 supergiants using the equivalent width measures of OI λ7774 and FeI λ7748
  • Quantitative test for concave aspheric surfaces using a Babinet compensator 
    Saxena, A. K (Optical Society of America, 1979)
    A quantitative test for the evaluation of surface figures of concave aspheric surfaces using a Babinet compen-sator is reported. A theoretical estimate of the sensitivity is 0.002X for a minimum detectable phase change of ...

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