IIA Institutional Repository: Recent submissions

  • Radiative Transfer Models of Dust Shells Around Post-AGB Stars 
    Surendiranath, R; Parthasarathy, M; Varghese, B. A (Springer, 2002-09)
    We present a radiative transfer analysis of circumstellar dust shells around the Post-AGB stars HD 179821, HD 56126, HD 101584 and early R star HD 100764, using the code DUSTY. Parameters like mass-loss, shell inner radius, ...
  • Accurate Calculations of Interstellar Lines of Mg+ Using the Coupled Cluster Approach 
    Majumder, S; Merlitz, H; Gopakumar, G; Das, B. P; Mahapatra, U. S; Mukherjee, Debashis (The American Astronomical Society., 2002-07)
    One of the most successful ab initio, highly correlated all-order many-body methods, the relativistic coupled cluster theory, is employed to calculate excitation energies of the doublet states of Mg+ and allowed transitions ...
  • High resolution spectroscopy of the R Coronae Borealis star, V854 Centauri, during a deep minimum 
    Kameswara Rao, N; Lambert, D. L (American Astronomical Society, 1993-05)
    The R Coronae Borealis star V854 Cen was observed at minimum light (V about 15) at high spectral resolution from 5480 to 7070 A. The spectrum consists of three components: a continuum devoid of photospheric lines, a ...
  • The modulation of radiation in an electron-positron plasma 
    Gangadhara, R. T; Krishan, V; Shukla, P. K (Royal Astronomical Society, 1993-05-01)
    The modulational instability of a large-amplitude, linearly polarized electromagnetic wave propagating in an electron-positron plasma is considered, including the combined effect of relativistic mass variation of the plasma ...
  • The calcium K-line profiles as function of latitude and solar cycle phase 
    Singh, J (Elsevier, 2002-05)
    We have monitored the Calcium K-line profiles on daily basis at all the 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. ...
  • Non-emission-line young stars of intermediate mass 
    Manoj, P; Maheswar, G; Bhatt, H. C (Blackwell Publishing Ltd, 2002-08)
    We present optical spectra of four intermediate-mass candidate young stellar objects that have often been classified as Herbig Ae/Be stars. Typical Herbig Ae/Be emission features are not present in the spectra of these ...
  • A model of the 'steady' and 'fluctuating' parts of the sun's internal magnetic field 
    Gokhale, M. H; Hiremath, K. M (American Astronomical Society, 1993-04-10)
    We model the structure of the 'steady' (slowest varying) part of the sun's internal poloidal magnetic field assuming it to be (for given reasons and in the relevant domain) a current-free field whose field lines 'isorotate' ...
  • High angular resolution structures in the dust shell surrounding WR 104 from lunar occultation observations at 2.2 µm 
    Mondal, S; Chandrasekhar, T (Astronomical Society of India, 2002-09)
    A rare event of lunar occultation of a Wolf-Rayet star (WRI04) in the near IR K-band (2.2 micron) is reported. AnalYSis of the occultation light curve shows a fully resolved dust envelope departing significantly from a ...
  • Circumstellar environment around young stars in nearby OB associations 
    Manoj, P; Maheswar, G; Bhatt, H. C (Astronomical Society of India, 2002-09)
    We study the circumstellar environment around intermediate mass young stars in nearby OB associations of different ages. We find that a significant fraction of stars in these associations ha.ve cool circumstellar ...
  • Near infrared photometry of the young open cluster NGC 1960 
    Hasan, P; Kilambi, G. C; Baliyan, K. S (Astronomical Society of India, 2002-09)
    We present the preliminary results of observations of NGC 1960 which was observed from the Mt Abu Infrared Observatory, using the NICMOS3 infrared array mounted on the 1.2 m Cassegrain focus telescope. The observations ...
  • Intermediate Galactic Latitude Starforming Region-CG 12 
    Maheswar, G; Manoj, P; Bhatt, H. C (Astronomical Society of India, 2002-09)
    Optical linear polarization measurements of stars seen projected towards CG 12, an intermediate latitude (b = 2P .1) starforming cloud, have been made. The results show that the polarization vectors of the majority of the ...
  • Intermediate Galactic Latitude Starforming Region-CG 12 
    Maheswar, G; Manoj, P; Bhatt, H. C (Astronomical Society of India, 2002-09)
    Optical linear polarization measurements of stars seen projected towards CG 12, an intermediate latitude (b = 2P .1) starforming cloud, have been made. The results show that the polarization vectors of the majority of the ...
  • Spatial distribution of Unidentified Infrared emission Bands in star forming regions 
    Ghosh, S. K; Ojha, D. K (Astronomical Society of India, 2002-09)
    Midcourse Space Experiment (MSX) has surveyed the Galactic plane in four infrared bands between 6 and 25 /Lm, two of which cover several Unidentified Infrared emission Bands (UIBs). A scheme has been developed to extract ...
  • Far-infrared study of a few southern Galactic star forming regions 
    Ojha, D. K; Ghosh, S. K; Verma, R. P (Astronomical Society of India, 2002-09)
    Simultaneous far-infrared observations at 130 and 200 pm of the southern Galactic star forming regions (associated with mAS 12326-6245, IRAS 17059-4132, !RAS 17160-3707 & IRAS 17233-3606) have been carried out using the ...
  • A near-infrared study of the massive young star IRAS 02230+6202 and its surroundings 
    Mishra, S; Anandarao, B. G; Ojha, D. K (Astronomical Society of India, 2002-09)
  • Radio study of the Galactic Centre Environment 
    Roy, S (Astronomical Society of India, 2002-09)
    The central region of our milky way Galaxy still eludes a comprehensive understanding. With new observations. however. we are being able to know many of the observable properties of the sources, which allow us to better ...
  • Near-Infrared Investigations of Star Forming Regions 
    Anandarao, B. G (Astronomical Society of India, 2002-09)
    We have initiated an observational programme on star formation using the 256 x 256 HgCd'Th Infrared Array Camera.(NICMOS3) at the 1.2 m m telescope in Mt. Abu. The observations, being made in the spectral region 1-2.5 pm, ...
  • Hanle effect with angle-dependent partial redistribution 
    Nagendra, K. N; Frisch, H; Faurobert, M (The European Southern Observatory, 2002-11)
    The polarized line transfer equation for the Hanle effect is solved in the framework of an exact partial frequency redistribution (PRD) theory developed by Bommier (1997a,b). In that theory the effect of collisions on the ...
  • On the absolute magnitude of V482 Cygni, an R Coronae Borealis star 
    Kameswara Rao, N; Lambert, D. L (Astronomical Society of the Pacific, 1993-06)
    An identification of V482 Cygni, a R Coronae Borealis star, with a quadruple system containing a K5 III star is rejected. High-resolution spectra show that the radial velocity of V482 Cyg and the K5 III star differ by 35 ...
  • Effects of magnetic shear, spot, and plage rotation on prominence evolution 
    Rausaria, R. R; Gupta, S. S; Selvendran, R; Raman, K. S; Singh, J (Kluwer Academic Publishers, 1993-08)
    We have studied the evolution of two dark H-alpha filaments as prominences during their disk passage from February 12 to February 19, 1992 and from March 6 to March 17, 1992, using Kodaikanal Observatory H-alpha and Ca II ...

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