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Browsing Publications of Astronomical Society of India by Title

Browsing Publications of Astronomical Society of India by Title

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  • Interstellar grains in the regions of anomalous extinction 
    Vaidya, D. B; Anandarao, B. G (Astronomical Society of India, 1993)
    We have evaluated the interstellar extinction curve and the ratio R of the total to the selective extinction using exact computations of extinction efficiencies for various grain models. The computed results are compared ...
  • Interstellar grains towards Orion 
    Vaidya, D. B; Anandarao, B. G; Desai, J. N (Astronomical Society of India, 1999)
    Using discrete dipole approximation (DDA) we calculate the extinction efficiencies of the porous silicate grains. We use these efficiencies to reproduce the observed extinction in the region of star formation in Orion and ...
  • Interstellar Matter 
    Krishna Swamy, K. S (Astronomical Society of India, 1974-03)
  • Intracluster extinction in young open star clusters 
    Sagar, R; Qian, Z. Y (Astronomical Society of India, 1993)
    An analysis of near-infrared data in combination with optical observations, indicates a normal interstellar extinction law around hot O and B stars at wavelengths greater than or = 0.9 micrometers. At shorter wavelengths, ...
  • Introduction to Markarian 421 special session 
    Fleury, P (Astronomical Society of India, 2002)
  • An introduction to the Indian Astronomical Observatory, Hanle 
    Cowsik, R; Srinivasan, R; Prabhu, T. P (Astronomical Society of India, 2002)
    Situated in the high-altitude cold desert of Changthang Ladakh bordering Himachal Pradesh and Tibet, Indian Astronomical Observatory, Hanle (32o46m46sN, 78o57'51''E; 4500 m above msl), provides excellent opportunities for ...
  • Ionization of the Interstellar Medium 
    Mallik, D. C. V (Astronomical Society of India, 1976-09)
  • Ionized molecules in facula models 
    Tripathi, B. M; Gaur, V. P; Pande, M. C (Astronomical Society of India, 1981-09)
    Equivalent widths for the lines of ionized molecules AlH+, CH+, CN+ CO+, N2+, NH+, OH+ and SiH+ have been calculated in five facular and two photospheric models. The calculations suggest that CH+ should show up in facular ...
  • Ionospheric Currents Associated with Solar Flares: A Short Review 
    Roy, M (Astronomical Society of India, 1980-03)
    The enhanced radiation of the X-rays and the ultra-violets during a chromospheric flare can induce a qualitative change in the ionospheric current system. The observational results of this effect, popularly known as ...
  • Ionospheric Effects During February 1980 Solar Eclipse 
    Chandra, H; Deshpande, M. R; Vyas, G. D; Sethia, G; Vats, H. O; Iyer, K. N (Astronomical Society of India, 1980-12)
    Highlights of the ionospheric effects of the total solar eclipse of February 16, 1980 detected by ground-based experiments in India are summarised. Decrease in electron density at various height in ionosphere upto the F2 ...
  • Ionospheric effects of the total solar eclipse of 24 October, 1995 over Ahmedabad 
    Chandra, H; Vyas, G. D; Sharma, S (Astronomical Society of India, 1998)
  • IPS observations of the solar wind at 327 MHz - A comparison with ULYSSES observations 
    Janardhan, P; Balasubramanian, V; Ananthakrishnan, S; Srivatsan, R (Astronomical Society of India, 1996)
    Extensive IPS observations at 327 MHz using the Ooty Radio Telescope (ORT) are presented. The observations spanning two and a half years starting in September 1992 covered two important periods during the Ulysses south ...
  • IPS survey at 327 MHz for detection of compact radio sources 
    Balasubramanian, V; Janardhan, P; Ananthakrishnan, S; Manoharan, P. K (Astronomical Society of India, 1993)
    In early 1992 a new feed was installed along the focal line of the 530 m long and 30 m wide parabolic cylinder reflector of the Ooty Radio Telescope (ORT). The new feed consisting of 1056 GaAsFET low noise amplifiers, one ...
  • IR observations of Am stars 
    Shylaja, B. S; Ashok, N. M (Astronomical Society of India, 2002)
    The IR observations of chemically peculiar stars are carried out and compared with the previous data in IR and far IR from IRAS. The flux redistribution appears to be a common phenomenon in all the stars of this class. The ...
  • IR Spectroscopy of Nova-like Sources 
    Banerjee, D. P. K; Ashok, N. M (Astronomical Society of India, 2003)
    Near - IR spectroscopic and photometric observations of the eruptive variables V838 Mon and V445 Puppis in the J H K bands are reported. These objects erupted in nova-like explosions but evolved into rather unique and ...
  • IR-IMAC - A developmental approach 
    Vidhya, V; Kamath, U. S; Vidhya, R (Astronomical Society of India, 2004-03)
    IR-IMAC is a multi-utility software package developed to remotely control the Near-Infrared imager installed on the 2-metre Himalayan Chandra Telescope at Mt. Saraswati, Hanle. The core idea in the development of IR-IMAC ...
  • Is HR 2947 a variable? 
    Kameswara Rao, N; Ashok, N. M; Kulkarni, P. V (Astronomical Society of India, 1981-06)
    Observations of HR 2947 show that it is fainter by 0.3 mag in V compared to the magnitude listed by Cowley et al. (1969). The energy distribution from 1565 Armstrong to 1.25 micro is similar to that of a B5 III star and ...
  • Is the Gravitational Constant, G, Changing with Time? 
    Narlikar, J. V (Astronomical Society of India, 1974-12)
  • Isolated pairs of spiral galaxies--a statistical study of far infrared and microwave characteristics 
    Venugopal, V. R; Narasimhan, K. S. V. S (Astronomical Society of India, 1993-06)
    A statistical study of the far infrared and microwave (lambda 6.3 cm ) lumnosities of a sample of isolated pairs of spiral galaxies and a comparison sample on non-interacting galaxies selected from the lists given by ...
  • IUCAA 2 meter telescope and its first light instrument IFOSC 
    Gupta, R; Burse, M; Das, H. K; Kohok, A; Ramaprakash, A. N; Engineer, S; Tandon, S. N (Astronomical Society of India, 2002-09)
    The various features of the IUCAA 2-meter telescope, its site parameters and considerations made for preserving the local seeing in terms of ventilation, thermal emissivity of the dome etc are described. The first ...

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