Publications of Astronomical Society of India: Recent submissions

  • Physical processes underlying the geomagnetic effects of solar wind dynamic pressure (Pd) variations 
    Sastri, J. H (Astronomical Society of India, 2007-12)
    A concise review of recent studies of the ground-level geomagnetic storm sudden commencements (ssc's)/positive sudden impulses (si's) observed in the dip equatorial region and at low latitudes is presented highlighting the ...
  • Study of MHD surface waves along the interfaces of the magneto sheath, boundary layer and magnetosphere with the effect of solar wind 
    Rathinavelu, G. D; Sivaraman, M; Satya Narayanan, A; Somasundaram, K (Astronomical Society of India, 2007-12)
    The magnetospheric boundary layer, which is the interface between the magneto sheath and the magnetosphere, has been considered to be the plasma slab surrounded by moving and static plasma media on either side. The ...
  • Radio spectrum measurements at the Gauribidanur observatory 
    Monstein, C; Ramesh, R; Kathiravan, C (Astronomical Society of India, 2007-12)
    During a campaign in December 2006, radio spectrum measure- ments over the frequency range 45-870 MHz were carried out at the Gauribida- nur observatory, located about 100 km north of Bangalore. The spectrometer used for ...
  • Fe XIV green/Fe XIII infrared line ratio diagnostics 
    Srivastava, A. K; Singh, J; Dwivedi, B. N; Muneer, S; Sakurai, T; Ichimoto, K (Astronomical Society of India, 2007-12)
    We consider the first 27-level atomic model of Fe XIII (5.9 K < log Te < 6.4 K) to estimate its ground level populations, taking account of electron as well as proton collisional excitations and de-excitations, radiative ...
  • Study of bubble nebula using IUE high resolution spectra 
    Anand, M. Y; Kagali, B. A; Murthy, J (Astronomical Society of India, 2009-06)
    In this paper, we have analyzed IUE high resolution spectra of the central star (BD+602522) of the Bubble nebula. We discuss velocities of the different regions along the line of sight to the bubble. We find that the Bubble ...
  • Magnetic nature of coronal loops 
    Singh, J; Muneer, S; Sakurai, T; Ichimoto, K (Astronomical Society of India, 2007-12)
    It is generally believed that the magnetic pressure is much higher than the gas pressure in the coronal loops and these loops are isothermal in nature. We made systematic observations of four strong coronal emission lines ...
  • Design and analysis of an FUV spectrograph for a small satellite 
    Munshi, R; Prasad, B. R; Murthy, J (Astronomical Society of India, 2009-06)
    The Halo Ultraviolet Explorer (HUE) is a payload aimed at studying the diffuse far ultraviolet sky over a bandpass of 800 -- 1200 Ao. The novel features of HUE include a large effective collecting area (254 cm2) and fast ...
  • TAUVEX flight calibrations: Plans and challenges 
    Safonova, M; Shalima, P; Murthy, J (Astronomical Society of India, 2009-06)
    The operational tasks for the Performance Verification (PV) and calibration phase in the first year of TAUVEX operation are presented. The new challenges regarding the possible reduction in sensitivity are outlined and are ...
  • Interstellar dust studies with TAUVEX 
    Maheswar, G; Muthu, C; Sujatha, N. V; Pandey, G; Bhatt, H. C; Kameswara Rao, N; Murthy, J (Astronomical Society of India, 2007-06)
    We propose to carry out studies on the properties of inter- stellar dust using TAUVEX. Through the multi-band TAUVEX observations, particularly with the use of filters optimized for extinction observations of the 2175 ° ...
  • Pre-main sequence stars, emission stars and recent star formation in the Cygnus region 
    Bhavya, B; Mathew, B; Subramaniam, A (Astronomical Society of India, 2007-09)
    The recent star formation history in the Cygnus region is studied using 5 clusters (IC 4996, NGC 6910, Berkeley 87, Biurakan 2 and Berkeley 86). The optical data from the literature are combined with the 2MASS data to ...
  • On the progenitor of supernova 1987 A 
    Parthasarathy, M; Branch, D; Baron, E; Jeffery, D. J (Astronomical Society of India, 2006-12)
    A previously unpublished ultralow-dispersion spectrum of Sand- uleak -69 202, the stellar progenitor of SN 1987A, is presented and the uncertain presupernova evolution of Sanduleak -69 202 is discussed.
  • Star formation in the region of young open cluster - NGC 225 
    Subramaniam, A; Mathew, B; Sreeja S. K (Astronomical Society of India, 2006-12)
    NGC 225 is believed to be a 120 Myr old open cluster located at tilda 650 pc. Eight stars with H alphaemission are found to be located around the cluster, of which two are probable Herbig Be stars, indicating a very young ...
  • Astrophysical molecule CN: vibronic transition probability parameters 
    Karthikeyan, B; Balachandra Kumar, K; Rajamanickam, N; Bagare, S. P (Astronomical Society of India, 2006-06)
    Astrophysical applications are broadened by the emerging consensus on the vibration-electronic (vibronic) transition probability parameters such as Franck - Condon (FC) factors & r - centroids of some molecular species ...
  • Some possible observing programmes in stellar and galactic astronomy with the TAUVEX 
    Bhatt, H. C (Astronomical Society of India, 2007-06)
    While the major part of the survey observations with the TAU- VEX will be targeted on high galactic latitudes and celestial poles there are many observing proposals for stellar and galactic astronomy. Some of these on young ...
  • Occultation of 2UCAC 42376428 by (423) Diotima on 2005 March 06 
    Vasundhara, R; Kuppuswamy, K; Ramamoorthy, S; Velu, C; Venkataramana, A. K (Astronomical Society of India, 2006-03)
    Observations of the occultation of the star 2UCAC 42376428 by (423) Diotima on 2005 March 06 at the Vainu Bappu Observatory are reported. The observed mid time of the event at 15:12:25.1 UT occurred 3.4 s later than the ...
  • Gauribidanur radio array solar spectrograph (GRASS) 
    Ebenezer, E; Subramanian, K. R; Ramesh, R; Sundararajan, M. S; Kathiravan, C (Astronomical Society of India, 2007-06)
    We describe the Gauribidanur radio array solar spectrograph (GRASS) and its various systems. The system consists of an array of 8 log periodic dipoles,a spectrum analyzer and a data acquisition system. The spectrograph ...
  • UV observations of globular clusters and nearby galaxies 
    Subramaniam, A (Astronomical Society of India, 2007-06)
    We propose to identify the hot stellar population of the galactic globular clusters (GCs) using the TAUVEX. These stars can be easily identified in the core of the GCs where the crowding due to the main-sequence stars get ...
  • Further evidence for intra-night optical variability of radio-quiet quasars 
    Goyal, Arti; Gopal-Krishna; Sagar, R; Anupama, G. C; Sahu, D. K (Astronomical Society of India, 2007-06)
    Although well established for BL Lac objects and radio-loud quasars, the occurrence of intra-night optical variability (INOV) in radio-quiet quasars is still debated, primarily since only a handful of INOV events with good ...
  • TAUVEX---UV observations from geosynchronous orbit 
    Murthy, J; Safonova, M; Mohan, Rekhesh; Gopakumar, P (Astronomical Society of India, 2007-06)
    The T Observatory consists of three identical co-aligned telescopes operating in several bands in the 1200-3500, rmAA bandpass from geostationary orbit. The major science objectives of T are (a) searches for QSOs and AGNs ...
  • Helioseismology - Impact and Implications 
    Hasan, S. S (Astronomical Society of India, 1995-09)

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