Publications of Astronomical Society of India: Recent submissions

  • Mass function study of six open clusters Be 10, Be 67,To 5, Be 15, Be 71 and King 1 
    Lata, S (Astronomical Society of India, 2005-06)
    In the present study, we have used the CCD data to determine the luminosity and mass function of six open clusters. Members of clusters are identified using photometric and statistical criteria. From these members, we have ...
  • Highlights from the observatories 
    Saikia, D. J (Astronomical Society of India, 2005-03)
  • Mass limit on Nemesis 
    Bhalerao, V; Vahia, M. N (Astronomical Society of India, 2005-03)
    We assume that if the sun has a companion, it has a period of 27 Myr corresponding to the periodicity seen in cometary impacts on earth. Based on this assumption, it is seen that the inner Lagrangian point of the interaction ...
  • Period-brightness relationship in chromospheric bright points 
    Kariyappa, R; Satya Narayanan, A; Dame, L (Astronomical Society of India, 2005-03)
    Chromospheric bright points are sites where intense heating takes place by 3-min period waves. A 35-min-long time series of photographic spectra obtained in CaII H-line on a quiet region at the center of the solar disk ...
  • Studies on Halpha and SXR flares in relation to Type III metric bursts 
    Das, T. K; Sarkar, H; Manna, A (Astronomical Society of India, 2005-03)
    A study was made on Halpha and SXR flares in relation to Type III metric bursts. The interrelationship between Halpha and SXR flares was examined by grouping the events into two categories, (i) the events associated with ...
  • Fractal analysis of galaxy surveys 
    Seshadri, T. R (Astronomical Society of India, 2005-03)
    Fractal analysis is a powerful tool to study the nature of galaxy distribution. The use of multifractal analysis of the galaxy distribution for the investigation of the transition to homogeneity in the Universe is reviewed. ...
  • Expansion of radio galaxies in a cosmologically evolving medium: possible implications for the cosmic star-formation history 
    Barai, P; Gopal-Krishna; Osterman, M. A; Wiita, P. J (Astronomical Society of India, 2004-12)
    We compare earlier estimates of the volumes filed by lobes of radio galaxies during the quasar era based upon non-evolving ambient media with new ones assuming a strong cosmological evolution of the ambient medium. If the ...
  • CCD photometry of the galactic star clusters Be 15, Be 71 and King 1 
    Lata, S; Mohan, V; Sagar, R (Astronomical Society of India, 2004-12)
    We present UBV RI CCD photometry of three open star clusters Be 15, Be 71 and King 1 for the fist time. Base on these data, optical colour magnitude diagrams (CMDs) for the stars in the clusters down to V = 22 mag are ...
  • Galactic supernova remnants: an updated catalogue and some statistics 
    Green, D. A (Astronomical Society of India, 2004-12)
    A catalogue of 231 Galactic supernova remnants (SNRs) is presented, and the selection effects applicable to the identification of remnants at radio wavelengths are discussed. In addition to missing low surface brightness ...
  • A near-infrared stellar spectral library; I. H-band spectra 
    Ranade, A; Gupta, R (Astronomical Society of India, 2004-12)
    This paper presents the H band near-infrared (NIR) spectral library of 135 solar type stars covering spectral types O5-M3 and luminosity classes I-V as per MK classification. The observations were carried out with 1.2 meter ...
  • UBVRI CCD photometric studies of open clusters Berkeley 15, Czernik 18 and NGC 2401 
    Sujatha, S; Babu, G. S. D; Ananthamurthy, S (Astronomical Society of India, 2004-12)
    CCD photometric observations of three open clusters Berkeley 15 (=OCl 414), Czernik 18 (=OCl 426) and NGC 2401 (=OCl 588), obtained for the first time in UBVRI filters down to V=20 mag, are presented here. They are located ...
  • Intensities of CII and CO lines and emissions from interstellar dust 
    Qaiyum, A (Astronomical Society of India, 2004-12)
    A comparative study of Weingartner and Draine (2001) (hereinafter referred as WD) and Bakes and Tielens (1994) (hereinafter referred as BT) models of photoelectric heating effiencies of gas shows that for neutral medium ...
  • Measuring global curvature and cosmic acceleration with supernovae 
    Schmidt, B. P (Astronomical Society of India, 2004-12)
  • PKS1830-211: The strongest lensed radio source 
    Narasimha, D (Astronomical Society of India, 2004-09)
    The Ooty lens PKS1830-211 is a bright, variable radio source at a redshift of 2.507 consisting of a compact flat spectrum core, associated knot and jet, which are lensed by an intervening spiral galaxy at a redshift of ...
  • Spectral structure of X-shaped radio sources 
    Vir Lal, D; Pramesh Rao, A (Astronomical Society of India, 2004-09)
    Analysis of Giant Metrewave Radio Telescope low frequency data for an X-shaped source, 3C 223.1 has revealed an unusual result as discussed earlier by Lal & Rao (2004). The radio morphologies of it at 240 and 610 MHz show ...
  • HI deficiency in groups: what can we learn from Eridanus ? 
    Omar, A (Astronomical Society of India, 2004-07)
    The HI content of the Eridanus group of galaxies is studied using the GMRT observations and the HIPASS data. A significant Hi deficiency up to a factor of 2 2 - 3 is observed in galaxies in the Eridanus group. The deficiency ...
  • GMRT study of extremely faint dwarf irregular galaxies 
    Begum, A; Chengalur, J. N (Astronomical Society of India, 2004-09)
    We present results of deep, high velocity resolution (~1.6 km s-1) Giant Metrewave Radio Telescope (GMRT) HI 21 cm-line observations of a sample of extremely faint (MB > -12.5) dwarf irregular galaxies. unlike previous ...
  • Baby supernovae through the looking glass at long wavelengths 
    Chandra, P; Ray, A (Astronomical Society of India, 2004-09)
    We emphasize the importance of observations of young supernovae in wide radio band. We argue on the basis of observational results that only high- or only low-frequency data is not sufficient to get full physical picture ...
  • Kinematics of diffuse interstellar clouds: recent GMRT results 
    Dwarakanath, K. S (Astronomical Society of India, 2004-09)
    high latitude HI 21 cm-line absorption survey towards extragalactic sources was recently completed using the Giant Meterwave Radio Telescope (GMRT). A total of 104 sources with |b|>15o and with a 21 cm ¤ux density greater ...
  • The Galactic centre region 
    Roy, Subhashis (Astronomical Society of India, 2004-09)
    We have observed the central 450 region of the Galaxy at 620 MHz band of the Giant Metrewave Radio Telescope (GMRT) in radio continuum, and measured the polarisation properties of 64 small diameter background extragalactic ...

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