Publications of Astronomical Society of India: Recent submissions

  • Spectroscopy of IRAS sources with far IR colors similar to those of planetary nebulae 
    Reddy, B. E; Parthasarathy, M (Astronomical Society of India, 1993)
    Optical candidates of 17 unidentified IRAS sources with far-infrared colors similar to planetary nebulae have been detected on sky survey plates. Low resolution CCD spectra of seven optical candidates suggests that they ...
  • Photometric elements, absolute dimensions and evolutionary status of the eclipsing binary HU Tauri 
    Parthasarathy, M; Sarma, M. B. K; Vivekananda Rao, P (Astronomical Society of India, 1993)
    The photometric elements of HU Tauri are derived from an analysis of its B and V light curve using the Wilson and Devinney (1971) light curve synthesis method. The photometric elements suggest that HU Tauri is a semi-detached ...
  • Mass transfer in ALGOLS and its implications to the mass transfer theory 
    Chaubey, U. S (Astronomical Society of India, 1993)
    he average mass transfer rates in four Algol-type binary stars RZ Cas, TV Cas, SW Cyg and DI Peg are derived from their observed period changes in the light of alternate period change model. The results have been used to ...
  • Near infrared photometry of unassociated IRAS point sources in the zodiacal belt 
    Ashok, N. M; Chandrasekhar, T; Ragland, S; Watson, P. V (Astronomical Society of India, 1993)
    An observational program to generate a list of bright near infrared sources using IRAS Point Source Catalogue for further studies using lunar occultation technique has been initiated at Physical Research Laboratory, ...
  • 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 ...
  • Balloon-borne far-infrared mapping of galactic star forming regions 
    Das, B; Ghosh, S. K; Rengarajan, T. N; Verma, R. P; Iyengar, K. V. K; Tandon, S. N (Astronomical Society of India, 1993)
    Large angular areas (greater than 500 sq arcmin each) covering the three Galactic star forming regions (NGC 2024, OMC-1/OMC-2, and IRAS 06058 + 2138 and its neighborhood) have been mapped in two FIR bands (58 and 150 ...
  • The infall time-scale in the solar neighborhood 
    Basu, S (Astronomical Society of India, 1993)
    The Galactic disk is supposed to have been formed from gas condensing out from the halo. The rate at which this infall of gas occurs, the amount of infall, and the time scales over which gas falls on to the disc have ...
  • Effects of velocity laws on line formation 
    Srinivasa Rao, M; Varghese, B. A (Astronomical Society of India, 1993)
    We calculated the spectral line profiles in a spherically symmetric expanding medium. Complete redistribution of photons in the line for a two level atom is assumed with Doppler profile function in a purely scattering ...
  • Dwarf cepheid DY Pegasus -- revisited 
    Kilambi, G. C; Rahman, A (Astronomical Society of India, 1993)
    UBV broadband photoelectric photometry of dwarf cepheid DY Pegasus is presented. Using the observed light variations of this pulsating variable, mass, radius, gravity and temperature variations over a pulsational cycle ...
  • Velocity field structure in the Orion Nebula 
    Seema, P; Banerjee, D. P. K; Anandarao, B. G (Astronomical Society of India, 1993)
    High quality interferograms have been obtained on the H II region in the Orion Nebula in the emission line of (OIII) 5007 A using the high resolution imaging Fabry-Perot spectrometer. Velocity profiles were obtained for ...
  • 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, ...
  • Ultra rapid variability in gamma CAS and lambda ERI 
    Chakraborty, A; Anandarao, B. G; Swaminathan, R (Astronomical Society of India, 1993)
    We present here preliminary results of observations on two Be stars gamma Cas and lambda Eri made during 27-30 December 1992 and 14-15 February 1993.
  • Hard X-ray spectra of some X-ray binaries from balloon-borne observations 
    Chitnis, V. R; Agrawal, P. C; Manchanda, R. K; Rao, A. R (Astronomical Society of India, 1993)
    We have studied X-ray binaries 4U1907 + 09, GX1 + 4 and Cygnus X-1 in the energy range 20-100 keV, using balloon-borne xenon-filled multilayer proportional counters flown from Hyderabad, India. Results of these observations ...
  • Optical identification and BVRI photometry of a few 'unidentified' IRAS sources of a late type stellar nature 
    Iyengar, K. V. K (Astronomical Society of India, 1993)
    A search for the optical counterparts of 21 'unidentified' IRAS sources was carried out using the Palomar Observatory Sky Survey (POSS), European Space Observatory (ESO) and Space Engineering Research Center (SERC) Sky ...
  • Infrared colors of RS CVn binaries 
    Rengarajan, T. N; Verma, R. P; Iyengar, K. V. K (Astronomical Society of India, 1993)
    IRAS 1D COADD data for 82 RS CVn systems have been analysed to obtain their magnitudes at 12 and 25 micrometers. Their colors V - (12) and (12) - (25) have been computed and discussed. For 62 stars, the excess at 12 ...
  • Dust around Herbig Ae/Be stars: IRAS low resolution spectra 
    Bhatt, H. C; Gorti, U (Astronomical Society of India, 1993)
    IRAS low resolution spectra are presented for 17 Herbig Ae/Be stars. The observed spectral characteristics are correlated with reddening E(B-V) and the spectral type of the star. The silicate emission feature at 9.7 ...
  • Disruption of forced current sheets in astrophysical plasmas 
    Lakhina, G. S (Astronomical Society of India, 1993)
    Ion tearing mode instability of the forced current sheets is studied. The trapped electrons have a strong stabilizing effect on the excitation of the instability. The presence of background turbulence can effectively lead ...
  • Faraday rotation versus stimulated Raman scattering in intense sources 
    Gangadhara, R. T; Krishan, V (Astronomical Society of India, 1993)
    A coherent plasma process such as the stimulated Raman scattering plays significant role in bringing about the changes in polarization characteristics of radiation. It is found that some of the observed polarization ...
  • Optical testing of a gamma-ray telescope mirror 
    Udupa, D. V; Shukla, R. P; Saksena, G. D (Astronomical Society of India, 1993)
    A large size concave mirror for use in the gamma-ray telescope TACTIC was tested. Focal length of the concave spherical mirror of diameter 600 mm was measured to be 401.2 cm using the Ronchi test. The surface accuracy of ...
  • Mobile domes for TACTIC telescope 
    Karkera, B. N; Puri, I. K; Bhat, C. L; Koul, R; Murthy, G. S. K; Suthar, R. L; Kmble, S. H (Astronomical Society of India, 1993)
    A system of mobile domes which have a minimal shadowing effect, is proposed for the TACTIC telescope being set up at Gurushikar, Mt. Abu. The important design considerations and the salient features of the proposed concept ...

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