IIAP Publications: Recent submissions

  • Abundances in planetary nebulae: Me 2-1 
    Surendiranath, R; Pottasch, S. R; García-Lario, P (EDP Sciences, 2004-07)
    ISO and IUE spectra of the round planetary nebula Me 2-1 are combined with visual spectra taken from the literature to obtain for the first time a complete extinction-corrected spectrum. With this, the physico-chemical ...
  • One more explanation of superluminal motion 
    Krishan, V (Indian Academy Sciences, 1988-12)
    A model in which stimulated Raman scattering produces superluminal motion in extragalactic radio sources is examined. The scattering medium studied is a plasma whose position, density, and temperature determine the rate ...
  • The low-frequency radio spectrum of the continuum emission from the undisturbed sun 
    Subramanian, K. R; Sastry, Ch. V (Indian Academy Sciences, 1988-12)
    The low-frequency radio spectrum of the continuum emission from the undisturbed Sun is determined for 24 days during the period 1985 May - September. It is found that the spectral index varied from +1.6 to +3.6 during this ...
  • Long-term polarimetric behaviour of the carbon Mira R Leporis 
    Raveendran, A. V; Kameswara Rao, N (European Southern Observatory, 1989-05)
    BVRI polarimetry of R Lep obtained during 1984-1987 shows large changes in the normalized wavelength dependence of polarization. It is found that both the amount and position angle of polarization had components which ...
  • Effect of the time spent by the photon in the absorbed state on the time-dependent transfer of radiation 
    Mohan Rao, D; Rangarajan, K. E; Peraiah, A (The American Astronomical Society, 1990-08)
    The time-dependent transfer equation is derived for a two-level atomic model which takes both bound-bound and bound-free transitions into account. A numerical scheme is proposed for solving the monochromatic time-dependent ...
  • Photon and dimuon pairs in an expanding quark-gluon plasma 
    Datta, B; Raha, S; Sinha, B (Elsevier, 1988-12)
    Diphotons and dimuons escaping the interaction regions in ultra-relativistic heavy-ion collisions are studied in a thermodynamical framework. The relevance of such an analysis for quark-gluon plasma diagnostics is highlighted.
  • The rotating envelope of the hot star gamma Cassiopeiae resolved by optical interferometry 
    Mourard, D; Bosc, I; Labeyrie, A; Saha, S. K (Nature Publishing Group, 1989-11)
    CERTAIN hot stars, belonging to the Be class, may have an envelope of hydrogen gas, possibly in the form of a rotating disk or spheroidal shell. Other models involve elliptical rings or close binary systems where the Roche ...
  • Induced magnetization of Alfven waves 
    Chakraborty, B; Khan, M. R; Sarkar, Susmita; Krishan, V; Bhattacharyya, B (Elsevier, 1990-07)
    The induced magnetization of propagating and standing Alfven waves (IMPAW and IMSAW, respectively) in plasmas, due to the inverse Faraday effect, is investigated here. This effect follows from the magnetic moment per unit ...
  • Injection spectrum of ultrahigh energy cosmic rays in the top-down scenario 
    Basu, R; Bhattacharjee, P (The American Physical Society, 2004-07)
    We analyze the uncertainties involved in obtaining the injection spectra of UHECR particles in the top-down scenario of their origin. We show that the Dokshizer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) Q/Sup2 evolution of ...
  • The Young Open Star Clusters: Stability and Structure 
    Pandey, A. K; Mahra, H. S; Sagar, R (American Astronomical Society, 1990-02)
    It is found to the differential extinction ΔE (B-V) in open clusters which may be due to the presence of gas and dust, decreases systematically with age of the cluster. Consequently we can infer that the average gas removal ...
  • CN 1-1 - A bipolar type I planetary nebula 
    Bhatt, H. C (European Southern Observatory, 1989-04)
    Polarization measurements of Cn 1-1 are interpreted as due to scattering by nebular dust. It is suggested that the nebula has a bipolar morphology. This, together with the enhanced nitrogen abundance in the nebula, supports ...
  • Chemical composition and evolutionary status of nine UV-bright stars in five globular clusters from VLT/UVES spectra 
    Jasniewicz, G; de Laverny, P; Parthasarathy, M; Lèbre, A; Thévenin, F (EDP Sciences, 2004-08)
    We have derived the chemical composition of nine UV-bright stars belonging to five Galactic globular clusters of various metallicities ([Fe/H] from -1.0 to -2.4 dex). The analyses are based on high resolution spectra ...
  • Do polar faculae on the sun predict a sunspot cycle? 
    Makarov, V. I; Makarova, V. V; Sivaraman, K. R (Springer, 1989-03)
    The paper reports the results of the analysis of the data on polar faculae for three solar cycles (1960–1986) at the Kislovodsk Station of the Pulkovo Observatory and on polar bright points in Ca ii K line for two solar ...
  • Variation in the network flux as derived from the Calcium K-line profiles as function of latitude and solar cycle phase 
    Singh, J; Gholami, I; Muneer, S (Elsevier, 2004)
    We have obtained the Calcium K-line profiles, on daily basis, at all latitudes, while integrating the spectrum over the visible longitudes of the Sun by moving a ~340 mm solar image at a uniform speed in the E-W direction ...
  • Nonpotential magnetic fields at sites of gamma-ray flares 
    Hagyard, M. J; Venkatakrishnan, P; Smith, J. B. Jr (American Astronomical Society, 1990-06)
    The relation between the degree of nonpotentiality of photospheric magnetic fields and the occurrence of gama-ray flares is examined to determine whether there are special signatures of the stressed fields for this type ...
  • Equivalent widths of hydrogen Lyman alpha line in an expanding spherical atmosphere 
    Peraiah, A; Ingalgi, M. F (Indian Academy of Sciences, 1990-06)
    The profiles of hydrogen Lyman-alpha line in an expanding spherical atmosphere containing dust and gas were calculated. The variation of equivalent widths with velocities of expansion of the atmosphere, together with the ...
  • Effects of rotation on the colours and line indices of stars. II - The effect on UVBY and H-beta indices 
    Mathew, A; Rajamohan, R (Indian Academy of Sciences, 1990-06)
    The intrinsic uvby and H-beta indices of member stars of Alpha-Persei, Pleiades, and Scorpio-Centaurus association have been analyzed in detail for rotation effects. These stars range in spectral type from B0 to F0 and the ...
  • Influence of the solar activity on the Indian Monsoon rainfall 
    Hiremath, K. M; Mandi, P. I (Elsevier, 2004-10)
    We use 130 years data for studying correlative effects due to solar cycle and activity phenomena on the occurrence of the Indian Monsoon rainfall. We compute the correlation coefficients and significance of correlation ...
  • Quasi-Periodicity in global solar radio flux at metric wavelengths during Noise Storms 
    Sundaram, G. A. S; Subramanian, K. R (Springer, 2004-08)
    We present observational results from studying the quasi-periodicities in global solar radio flux during periods of enhanced noise storm activity, over durations of 4 hr a day (`intra-day'' variations), observed at 77.5 ...
  • CCD photometry in VRI bands of the galactic cluster NGC 2818 
    Surendiranath, R; Kameswara Rao, N; Sagar, R; Nathan, J. S; Ghosh, K. K (Indian Academy of Sciences, 1990-06)
    The open cluster NGC 2818 containing a planetary nebula has been observed in VRI bands using the CCD system at prime focus of the 2.3 meter Vainu Bappu Telescope. The study extending to stars V of 21 magnitude established ...

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