Publications of Astronomical Society of India: Recent submissions

  • Diffuse gamma ray emission : Implications on cosmic ray origin 
    Sreekumar, P (Astronomical Society of India, 2002)
    The Compton Gamma Ray Observatory (CGRO) produced the first full sky survery in gamma rays resulting in significantly improved data on the spectral and spatial distribution of diffuse gamma-rays from our galaxy. The intense ...
  • Lithium in Stars on the Main Sequence and Beyond 
    Mallik, S. G. V (Astronomical Society of India, 2003)
    7Li provides a rare constraint on the baryonic density of the Universe and because of its fragile nature, it is also an excellent diagnostic of the physical processes occurring inside stars. The study of Li in Pop.I stars ...
  • The importance of atmospheric monitoring in Cherenkov experiments 
    Osborne, J. L; Aye, M; Chadwick, P. M; Daniel, M. K; McComb, T. J. L; McKenny, J. M; Nolan, S. J; Orford, K. J; Rayner, S. M (Astronomical Society of India, 2002)
    A review is presented of Monte Carlo simulations of the effects of differing atmospheric structure and absorption models on the Imaging Atmospheric Cherenkov Telescope signal. Methods of monitoring the atmosphere are discussed.
  • Gamma astronomy from space and from ground 
    Fleury, P (Astronomical Society of India, 2002)
    Ground based observations has come of age with the advent of the Whipple imaging telescope 10 years ago. The decade that followed has been a period of consolidation, with several detectors of performance comparable to that ...
  • Cosmic rays from SNRs and TeV gamma-ray astronomy 
    Rowell, G. P (Astronomical Society of India, 2002)
    The origin of Galactic cosmic rays is still a burning question that forms a major motivation for developments in ground-based gamma-ray astronomy. SNRs are long-thought to be sites for the acceleration of Galactic cosmic ...
  • X-ray Emissions from the Jovian System 
    Bhardwaj, A (Astronomical Society of India, 2003)
    X-ray emissions from Jupiter, discovered by Einstein observatory and followed up by ROSAT, have been thought to be excited by energetic and highly charged sulphur and oxygen ions precipitating from the inner magnetosphere ...
  • VHE Gamma-ray astronomy : Present status and future challenges 
    Finley, J. P (Astronomical Society of India, 2002)
    This paper will report on the status of VHE gamma-ray astronomy at the start of the new millennium. The decade of the 90's saw rapid development of the field and many new detectors and proposed facilities are discussed. ...
  • Solar Cycle Variation in GONG and MDI Data : 1995-2002 
    Tripathy, S. C (Astronomical Society of India, 2003)
    Both GONG and MDI projects have measured p-mode frequencies of the Sun for more than 7 years. Here we review what we have learnt from the temporal variation of the oscillation frequencie and splitting coefficients.
  • Spectroscopic Studies of Solar Corona During Eclipses and with Coronagraph 
    Singh, J (Astronomical Society of India, 2003)
    The profiles of forbidden lines in the coronal spectrum contain information on the physical parameters such as temperature, turbulence, mass motion and density of coronal structures. The spectra of Fe x (6374 Å) emission ...
  • Digitization of Kodaikanal Data 
    Singh, J; Muneer, S; Bagare, S. P; Rangarajan, K. E; Ramesh, K. B; Varghese, B. A; Samson, J. P. A; Devendran, P; Hariharan, G (Astronomical Society of India, 2003)
    In this report we describe a digitizer developed in the laboratories of the Indian Institutes of Astrophysics (IIA) to digitize the large amount of solar synoptic data obtained since 1904 at Kodaikanal. We show a sample ...
  • The role of sunspot umbral rotation in triggering solar flares 
    Sundararaman, K; Ramesh, K. B; Selvendran, R (Astronomical Society of India, 2003)
    The evolution of large active regions NOAA 9393 and NOAA 9433 observed during March and April 2001 respectively on their successive rotation and the active region NOAA 10069 that appeared during August 2002 were studied. ...
  • UBVRI CCD photometry of the OB associations Bochum 1 and Bochum 6 
    Yadav, R. K. S; Sagar, R (Astronomical Society of India, 2003)
    We report the first deep $UBVRI$ CCD photometry of 2460 stars in the field of two poorly studied OB associations Bochum 1 and Bochum 6. We selected 15 and 14 probable members in Bochum 1 and Bochum 6 respectively using ...
  • Production of sulphur dimers (S2) in Comet C/1996 B2 (Hyakutake) 
    Saxena, P. P; Singh, M; Bhatnagar, S (Astronomical Society of India, 2003)
    The reaction mechanism involving the association of two sulphur atoms through ethylene (C2H4), the latter acting as a catalyst to produce cometary sulphur dimers (S2) (Saxena & Misra, 1995), has been employed to compute ...
  • On the production of hydrocarbons in Titan's atmosphere 
    Saxena, P. P; Bhatnagar, S; Singh, M (Astronomical Society of India, 2003)
    The production of C(1 D) atoms and their role in the production of (C1, C2, C3, C4) hydrocarbons in Titan's atmosphere are discussed. The reaction between C(1 D) atom and H2 molecule to produce the methylidyne (CH) radical ...
  • NGC 1245 - an intermediate age open cluster 
    Subramaniam, A (Astronomical Society of India, 2003)
    The B, V CCD photometry of 916 stars in the field of the high galactic latitude intermediate age open cluster NGC 1245 is presented. The cluster parameters were estimated with the help of V vs(B-V) colour magnitude diagram ...
  • Search for periodicities in distribution of orbits of planets 
    Vahia, M. N; Mahajani, P; Rao, A. R (Astronomical Society of India, 2003)
    We investigate the distribution of extra-solar-system planets in order to search for periodicities in their distribution around their parent star. We use the database of one hundred planets outside the solar system from ...
  • Optical observations of the bright long duration peculiar GRB 021004 afterglow. 
    Pandey, S. B; Sahu, D. K; Resmi, L; Sagar, R; Anupama, G. C; Bhattacharya, D; Mohan, V; Prabhu, T. P; Bhatt, B. C; Pandey, J. C; Parihar, P. S; Castro-Tirado, A. J (Astronomical Society of India, 2003)
    The CCD magnitudes in Johnson B,V and Cousins R and I photometric passbands are determined for the bright long duration GRB 021004 afterglow from 2002 October 4 to 16 starting ~ 3 hours after the γ - ray burst. Light curves ...
  • Study of open cluster NGC 2509. 
    Sujatha, S; Babu, G. S. D (Astronomical Society of India, 2003)
    We present the first CCD photometric observations of the open cluster ocl 630 (NGC 2509) in UBVRI filters. It is a fairly nearby cluster at a distance of 912±15 pc, and is placed in the direction of the Puppis constellation ...
  • A new cycle in the periodicity of solar flare indices. 
    Das, T. K; Nag, T. K (Astronomical Society of India, 2003)
    A new cycle of about 5.5 years has been invoked in case of the periodicity in solar flare indices. As there exists no instrumental technique for measuring directly the energy output of an optical flare, the energy emitted ...
  • Dating stone inscriptions from eclipse records 
    Shylaja, B. S (Astronomical Society of India, 1997)
    The solar and lunar eclipses have been documented as stone inscriptions in various parts of Karnataka in South India. Descriptions in Kannada are available from 9th century A.D onwards. The dates of these eclipses have ...

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