Publications of Astronomical Society of India: Recent submissions

  • On the epochs of polarity reversals of the polar magnetic field of the sun during 1870-1982 
    Makarov, V. I; Sivaraman, K. R (Astronomical Society of Indian, 1986-09)
    The H-alpha synoptic charts for the 1904-1982 period and data on the polar prominences for the 1870-1905 period are used to investigate the polarity reversal of the polar magnetic field on the sun for 11 solar cycles. Good ...
  • Lower bounds on axion rest mass in a general cosmological scenario 
    Datta, B; Joshi, P. S (Astronomical Society of Indian, 1986-09)
    It is shown that, if axions make up the dark matter in the universe, a general lower limit range of 1.07-4.09 x 10 to the -5th eV can be set on the axion rest mass on the basis of consideration of general spacetimes, without ...
  • Central engine or locomotive 
    Kapoor, R. C (Astronomical Society of India, 1986-09)
    The astrophysical aspects of proposals of escape of supermassive blackholes from galactic nuclei and their implications in relation to quasars are discussed. We conclude that high velocity recoil of the central engine can ...
  • UBV photoelectric photometry of the open cluster NGC 2539 
    Joshi, U. C; Sagar, R (Astronomical Society of Indian, 1986-06)
    UBV photometric observations of 135 stars near NGC 2539, obtained using the 104-cm Sampurnanand reflector at Uttar Pradesh State Observatory during 1975-1978, are reported. The data are presented in tables and graphs and ...
  • Association of solar flares with twisting of magnetic neutral lines 
    Uddin, W; Pande, M. C; Shelke, R. N (Astronomical Society of Indian, 1986-06)
    A 'twisting index' is defined, assuming that flares tend to occur in highly sheared magnetic fields which also lead to a twisting of magnetic neutral lines in complex active regions. The correlation of this twisting index ...
  • Existence of libration points in the generalized photogravitational restricted problem of three bodies 
    Kumar, V; Choudhry, R. K (Astronomical Society of Indian, 1986-06)
    The motion of an infinitesimal mass under the gravitational field of two radiating bodies of finite mass is investigated analytically, with a focus on the possible existence of libration points, in the framework of the ...
  • On some visible and infrared atomic hydrogen lines in three photospheric models 
    Bondal, K. R; Gaur, V. P (Astronomical Society of Indian, 1986-06)
    The ability of the photosphere models of Holweger and Mueller (1974) (HM) and Vernazza et al. (1976 and 1981) (VAL) to predict the profiles in the wings of the Balmer, Paschen, and Brackett lines in the disk-center solar ...
  • Photometric study of the RS CVn binary II Pegasi 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V (Astronomical Society of Indian, 1986-03)
    An analysis of available data and of B and V photometry obtained at Kavalur on 39 nights during the 1980-81, 1981-82, and 1984-85 observing seasons of II Peg shows no two light curves to agree in shape, amplitude, phases ...
  • Weak cyanogen lines in the solar spectrum in the 4139 A-4215 A region 
    Porfir`eva, G. A (Astronomical Society of Indian, 1986-03)
    The identification reliability of solar spectrum cyanogen lines in the 4139-4215 A region is considered in connection with the study of velocity fields by means of line profile analysis. The identification of most of the ...
  • On the oscillator strength and the dissociation energy of CN molecules 
    Sinha, K; Tripathi, B. M (Astronomical Society of Indian, 1986-03)
    Equivalent widths of the CN red system in the solar spectrum are determined and compared with previous observational data in order to evaluate various published values for oscillator strength and dissociation energy. The ...
  • A Deconvolution Method for Astronomical Photometric and Spectroscopic Observations 
    Anandarao, B. G; Rao, S. R (Astronomical Society of Indian, 1986-03)
    A numerical method for deconvoluting one-dimensional optical imaging is described along with its algorithm. This method can be very successfully used for archieving image enhancement and restoration with minimized noise, ...
  • Decomposition of data into a sum of nonlinear functions Application to astronomical observations 
    Anandarao, B. G; Rao, S. R (Astronomical Society of Indian, 1986-03)
    In astronomical observations we often encounter spectra which are a result of superposition of individual contributions from phenomena of similar kind. We describe here a method together with its algorithm by which one can ...
  • Photometry of open cluster STOCK 17 
    Pandey, A. K (Astronomical Society of Indian, 1986-03)
    Photoelectric magnitudes of 10 stars in the field of Stock 17 have been obtained. The reddening is uniform across the cluster. A distance of 2.12 kpc has been estimated for the cluster. It is concluded that the age of the ...
  • Boundary to the solar system set by the Galaxy according to King-Innanen's formula 
    Rawal, J. J (Astronomical Society of Indian, 1986-03)
    A planet/comet-sun-Galaxy system is considered, under the assumption that the whole mass of the Galaxy is concentrated at its center, in order to find the limiting direct and retrograde orbits around the sun using ...
  • Generating Solution of the Restricted Three-Body Problem in 3-DIMENSION 
    Ahmad, A; Huda, M. N (Astronomical Society of Indian, 1986-03)
    As it is well known, the KS-transformation is a transformation which regularizes the equations of Keplerian motion in the three dimensional physical space to the four dimensional phase space. Kurcheeva (1977) has given ...
  • Galaxy mergers and globular clusters 
    van den Bergh, S (Astronomical Society of Indian, 1986-03)
    It is found from an analysis of recent observations that field ellipticals contain about five times, and Virgo ellipticals about 10 times, as many globular clusters as would be expected if they had been formed by merger ...
  • General upper limits to the age of the universe 
    Joshi, P. S (Astronomical Society of Indian, 1986-03)
    An inhomogeneous and anisotropic universe is modeled by means of a general class of relativistic space-times, and conclusions are derived concerning the most general upper bounds that can be set on the age of the universe. ...
  • Exposure time calculator for IFOSC and sky background estimation 
    Chakraborty, P; Das, H. K; Tandon, S. N (Astronomical Society of India, 2005-12)
    Abstract. This paper describes a spectroscopy exposure time calculator for the faint object spectrograph, the \IUCAA Faint Object Spectrograph" (IFOSC). It is intended to provide reasonable estimates of exposure times for ...
  • Aspects of prehistoric astronomy in India 
    Kameswara Rao, N (Astronomical Society of India, 2005-12)
    Some archeoastronomical aspects regarding the development of observational astronomy in India during prehistoric times are described. A plea is made for the preservation of megalithic monuments of possible astronomical ...
  • Optical observations and multiband modelling of the afterglow of GRB041006 : Evidence of a hard electron energy spectrum 
    Misra, K; Resmi, L; Pandey, S. B; Bhattacharya, D; Sagar, R (Astronomical Society of India, 2005-12)
    We present the CCD Cousins R band photometric observations of the afterglow of GRB 041006. The multiband afterglow evolution is modelled using an underlying `hard' electron energy spectrum with a p1 ~ 1.3. The burst appears ...

Search DSpace


Browse

My Account