IIAP Publications: Recent submissions

  • Phase diagram of a bosonic ladder with two coupled chains 
    Sethi Luthra, M; Mishra, T; Pai, R. V; Das, B. P (American Physical Society, 2008-10)
    We study a bosonic ladder with two coupled chains using the finite size density matrix renormalisation group method. We show that in a commensurate bosonic ladder the critical on-site interaction ($U_C$) for the superfluid ...
  • Predicting the amplitude of a solar cycle using the north south asymmetry in the previous cycle: II. an improved prediction for solar cycle 24 
    Javaraiah, J (Springer, 2008-11)
    Recently, using Greenwich and Solar Optical Observing Network sunspot group data during the period 1874 2006, Javaraiah ( Mon. Not. Roy. Astron. Soc. 377, L34, 2007: Paper I), has found that: (1) the sum of the areas of ...
  • Presence of LaO, Presence of LaO, ScO and VO molecular lines in sunspot umbral spectra 
    Sriramachandran, P; Bagare, S. P; Rajamanickam, N; Balachandra Kumar, K (Springer, 2008-11)
    High-resolution Fourier Transform Spectrometer sunspot umbral spectra of the National Solar Observatory/National Optical Astronomy Observatory at Kitt Peak were used to detect rotational lines from 19 electronic transition ...
  • Obscured and powerful AGN and starburst activities at z ~ 3.5 
    Polletta, M; Omont, A; Berta, S; Bergeron, J; Stalin, C. S; Petitjean, P; Giorgetti, M; Trinchieri, G; Srianand, R; McCracken, H. J; Pei, Y; Dannerbauer, H (EDP Sciences, 2008-12)
    Aims. Short phases of coeval powerful starburst and AGN activity during the lifetimes of the most massive galaxies are predicted by various models of galaxy formation and evolution. In spite of their recurrence and high ...
  • Rapid H-alpha variability in Phi Persei 
    Ghosh, K. K; Sanjeevkumar, T; Jaykumar, K; Kuppuswamy, K; Rosario, M. J (Astronomical Society of the Pacific, 1988-06)
    A search for rapid variability of H-alpha with a time resolution from 30 to 45 seconds is performed for Phi Per. In total, 42 spectra in H-alpha were obtained during three nights. Results show the presence of rapid irregular ...
  • Rapid variations of H-alpha emission strength of eight Be stars 
    Ghosh, K. K (Kluwer Academic Publishers, 1988-08)
    Rapid observations of H profiles of eight Be stars have been obtained and it is found that rapid (in a time-scale of 4 to 6 minutes) and irregular variations of total emission strength of H line are present in these stars. ...
  • Search for rapid H-alpha variability studies in Be stars - 28 Eri, X Ophiuchi, 66 Ophiuchi and Pi Aquarii 
    Ghosh, K. K (EDP Sciences, 1988-10)
    In order to search for rapid Hα variability in Be stars, a series of Hα profiles were observed on a time scale of few minutes for 28 Eri, X Oph, 66 Oph and π Aqr. In total, 95 and 54 Hα profiles were obtained for the program ...
  • Atomic parity nonconservation in Ra+ 
    Wansbeek, L. W; Sahoo, B. K; Timmermans, R. G. E; Jungmann, K; Das, B. P; Mukherjee, D (The American Physical Society, 2008-11)
    We report on a theoretical analysis of the suitability of the 7sS1/22↔6dD3/22 transition in singly ionized radium to measure parity nonconservation, in the light of an experiment planned at the KVI of the University of ...
  • Flare-like activity in Be stars HR 7403 and .8762 
    Ghosh, K. K (D. Reidel Publishing Co., 1989-05)
    Results are presented from rapid spectrophotometric observations of the Be stars HR 7403 and HR 8762. The observations were conducted between November, 1984 and December, 1985. No ultrarapid variations were detected in the ...
  • Observation of an H-alpha outburst in the Be star HR 4123 
    Ghosh, K. K; Apparao, K. M. V; Tarafdar, S. P (American Astronomical Society, 1989-09)
    During routine monitoring of the Be star HR 4123 during the year 1987-1988, a burst of H-alpha emission was observed on May 11, 1987. The increase was observed on May 9 and lasted until June 7, peaking to an equivalent ...
  • Search for rapid spectral variability in Psi(9) Aurigae 
    Ghosh, K. K (Astronomical Society of the Pacific, 1989-09)
    Observations of Psi(9) Aur on five nights between January 29 and February 3, 1988 were conducted as part of a search for rapid spectral variability in Be stars. In addition, a series of H-alpha profiles with a time resolution ...
  • Search for rapid V/R variability in Eta CEN 
    Ghosh, K. K (Royal Astronomical Society, 1989-10)
    In order to search for rapid V/R variability in the Be star, Eta Cen, a series of H-alpha profiles of this star were observed on three nights between May 28 and June 3, 1986. A method of estimating the standard deviation ...
  • Modeling Uranian mutual event light curves 
    Vasundhara, R (Elsevier, 2008-11)
    Salient features of the analysis of the mutual event light curves of planetary satellites are presented. The need to carefully evaluate the flux contribution of the occulting/eclipsing satellite to the total flux is ...
  • Estimation of coronal magnetic fields using Type-I emission 
    Gopalswamy, N; Thejappa, G; Sastry, Ch. V; Tlamicha, A (Czechoslovakia Academy of Sciences, 1986-03)
    The radial dependence of the coronal magnetic field above active regions is calculated using Type-I chain data existing in the literature. Assuming that Type-I emission is due to shock waves, the upstream shock velocity ...
  • Evidence of expansion in the central region of NGC 2346 
    Banerjee, D. P. K; Anandarao, B. G; Desai, J. N; Jain, S. K; Mallik, D. C. V (International Astronomical Union, 1989)
  • Initial masses 
    Mallik, D. C. V (International Astronomical Union, 1989)
  • CCD Photometry of NGC 2453 
    Mallik, D. C. V; Sagar, R; Pati, A. K (International Astronomical Union, 1993)
  • Effects of high radial velocities on line transfer in extended atmospheres 
    Peraiah, A (Copernicus Foundation for Polish Academy, 1980)
    The equation of radiative transfer in a comoving frame has been solved for rapidly expanding gaseous medium in spherically symmetric extended stellar atmospheres. A non-LTE two-level atom with Voigt profile function is ...
  • Interactions of UHE cosmic ray neutrinos with the cosmological neutrino background 
    Sivaram, C; Gandhi, R (International Union of Pure and Applied Physics, 1995)
    Apart from the cosmic microwave radiation background, the standard cosmology predicts a thermal neutrino background with a temperature around 20K. Methods suggested to detect such a background, include anomalous forces ...
  • Comoving Frame Calculations of Spectral Lines formed in Rapidly Expanding Media with the Partial Frequency Redistribution Function for Zero Natural Line Width 
    Peraiah, A (Indian Academy of Sciences, 1980-09)
    Comoving frame calculations have been used to compute the spectral lines formed in rapidly expanding spherical media. We have employed the angle-averaged partial frequency redistribution function R(I) with a two-level atom ...

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