Publications of Astronomical Society of India: Recent submissions

  • The age distribution of open clusters as a function of Trumpler's classification 
    Bhatt, B. C; Pandey, A. K; Mahra, H. S (Astronomical Society of Indian, 1989-03)
    The age distribution of open clusters is studied as a function of Trumpler's central concentration and range in brightness classes. For different Trumpler's classes within 1 kpc, it is shown that the observed distribution ...
  • Unidentified Sources in the FIRSSE Catalogue 
    Seal, P; Shivanandan, K (Astronomical Society of Indian, 1989-03)
    Thirty four sources are identified from 159 unidentified FIRSSE sources by matching the positions of the sources in different catalogues. Eighty three sources are examined optically on the POSS-E prints. We also discuss ...
  • Effects of Aberration and Advection in a Partially Scattering Medium 
    Peraiah, A; Srinivasa Rao, M (Astronomical Society of Indian, 1989-03)
  • Photometric Performance of the CCD Detector at the Kavalur 102-CM Reflector 
    Sagar, R; Pati, A. K (Astronomical Society of Indian, 1989-03)
    A CCD detector system built around the Thomson TH 7882 chip has recently been acquired for use at the 102 cm telescope at the Vainu Bappu Observatory (VBO). The chip has a coating for enhanced ultraviolet sensitivity, ...
  • Internal motions in the open star clusters NGC 654 and 6087 
    Sagar, R; Bhatt, H. C (Astronomical Society of Indian, 1989-03)
    Proper motion measurements are used to study the internal kinematics in the open star clusters NGC 654 and 6087. It is found that intrinsic dispersions are independent of stellar mass and radial distance in both clusters. ...
  • A rapid scan Fourier transform infrared spectrometer 
    Jain, S. K; Smyth, M. J (Astronomical Society of Indian, 1988-12)
    A rapid scan Fourier transform spectrometer for astronomical infrared spectroscopy, tested at the Cassegrain focus of the 102 cm telescope at Kavalur, is described. The design of the fore-optics and the performance of the ...
  • Decametric radio spectra of some galaxies in clusters 
    Subramanian, K. R; Sastry, Ch. V (Astronomical Society of Indian, 1988-12)
    Observations of 12 radio sources identified with clusters of galaxies were made in 1983-84 with a decameter-wave radio telescope. The measured flux densities at 34.5 MHz are combined with other low frequency measurements ...
  • Field star contamination in open star cluster NGC 2301 
    Mohan, V; Sagar, R (Astronomical Society of Indian, 1988-12)
    Photographic photometry of about 900 stars down to V = 17 mag has been carried out in the region of the open cluster NGC 2301. The cluster region seems to be severely contaminated by field stars. Statistical criteria yield ...
  • Propagation of magnetohydrodynamic waves in the solar atmosphere - Alfven p-waves in sunspots 
    Zhukov, V. I; Efremov, V. I (Astronomical Society of Indian, 1988-12)
    Numerical calculations are given for the propagation of Alfven p-waves in the solar atmosphere for Geronicolas' (1977) sunspot model. It is shown that Alfven p-waves with a period greater than 400s do not, in fact, penetrate ...
  • Variable stars in the old galactic cluster M67 
    Rajamohan, R; Bhattacharyya, J. C; Subramanian, V; Kuppuswamy, K (Astronomical Society of Indian, 1988-12)
    Schmidt plates of the old open galactic cluster M67 were obtained on twelve nights to find the most probable variables in the cluster. The Sabattier technique was used to derive the magnitudes of the cluster members. The ...
  • Receiver System for Two Ooty Synthesis Radio Telescope 
    Narayana, D. L; Venkatasubramani, T. L; Bagri, D. S (Astronomical Society of Indian, 1988)
    This paper describes the receiver system of the 4 km Ooty synthesis radio telescope (OSRT), consisting of 13 elements operating at 327 MHz. Major subsystems of the receiver electronics are briefly discussed. A round-trip ...
  • A new electronically steerable 1056 dipole array at 327 MHz for the Ooty radio telescope 
    Joshi, M. N; Swarup, G; Bagri, D. S; Kher, R. K (Astronomical Society of Indian, 1988)
    The electronically steerable 1056-element linear dipole array installed on the Ooty radio telescope in 1982 is described. The colinear dipole array consists of 22 subarrays of 48 dipole each and employs a low loss (about ...
  • Ooty synthesis radio telescope - Design and performance 
    Sukumar, S et. al. (Astronomical Society of Indian, 1988)
    The principle, design and operational parameters of the Ooty synthesis radio telescope (OSRT) are described. It consists of thirteen elements including the Ooty Radio Telescope, which is divided into five parts. Operating ...
  • Astrometry of Comet Halley during the 1985-86 apparition 
    Bagare, S. P; Scaria, K. K (Astronomical Society of Indian, 1988)
    Photographs of Comet Halley were obtained using the 1-m telescope of the Vainu Bappu Observatory, Kavalur, during the 1985-86 apparition, and astrometric measurements carried out. The details of the observations and the ...
  • A study of coronal streamers during the total solar eclipse of 1980 February 16 
    Raju, A. K; Abhyankar, K. D (Astronomical Society of Indian, 1988)
    Procedure outlined by Saito and Billings has been used for deriving the three dimensional configurations of 17 coronal streamers from the photographs of total solar eclipse of 1980 Feburary 16. Almost all streamers were ...
  • Supernova 1987A - A review 
    Bhattacharya, D (Astronomical Society of Indian, 1988)
    Supernova 1987A, the first supernova since the time of Kepler to reach naked-eye visibility, was discovered on February 24, 1987, in the Large Magellanic Cloud. This has naturally been of great interest to astronomers. The ...
  • Project Kalki - A sky survey with the Schmidt telescope. 2 
    Rajamohan, R; Shankar, P. N; Bhattacharyya, J. C; Kuppuswamy, K; Paranjpye, A (Astronomical Society of Indian, 1988-03)
    The region of the sky photographed with the 45cm Schmidt telescope during 1987 March-May and the position of the asteroids detected on these plates are reported in this paper. Out of the 29 asteroids observed four have ...
  • Extinction measurements at Leh 
    Singh, J; Bhattacharyya, J. C; Raveendran, A. V; Mohin, S; Ashoka, B. N (Astronomical Society of India, 1988-03)
    Observations were started at Leh in 1984 with a view to finding the possibility of setting up an astronomical observatory for infrared observations. Results of extinction measurements in UBV bands obtained on 12 nights ...
  • Magnetic field and the ionic tail of comet Halley 
    Krishan, V; Ramadurai, S (Astronomical Society of Indian, 1988-03)
    The space missions to comet Halley have reported an increase of the magnetic field from (12-15) x 10 to the -5th gauss, characteristic of the interplanetary solar wind, to a peak field strength of (70-80) x 10 to the -5th ...
  • An Analysis of Proper Motion and Membership Probability in Open Clusters 
    Sagar, R (Astronomical Society of Indian, 1987-12)
    An analysis of the proper motion data and membership probability has been carried out for nine open clusters. The effects of observational errors on the parameters characterzing the frequency distributions of cluster and ...

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