IIAP Publications: Recent submissions

  • Radio and EUV measurements of the equatorial coronal hole of February 25, 1999 
    Subramanian, K. R; Sundaram, G. A. S (Astronomical Society of the Pacific, 2005)
    We present here the observations of the equatorial coronal hole made at 109 MHz on February 25, 1999 with the Gauribidanur Radioheliograph. The brightness temperature of this coronal hole is about 1:7£105 K.We compare our ...
  • Exploiting large surveys for galactic astronomy 
    Corbally, C. J; Bailer-Jones, C. A. L; Giridhar, S; Lloyd Evans, T. H (Cambridge University Press, 2007-08)
    This summary of JD13, Exploiting large surveys for Galactic astronomy, is based on the talks that were given during the meeting and/or submitted to the full proceedings which appeared in MemSAI 77 no. 4, 2006. The electronic ...
  • Nova V4444 Sagittarii 1999 in the early decline and quiescent phases 
    Kamath, U. S; Ashok, N. M; Anupama, G. C (Astronomical Society of India, 2008-12)
    We present near-infrared and optical spectra of the fast nova V4444 Sagittarii at two single epochs in the early decline phase and unfiltered images obtained in quiescence. Based on this and other available data, we discuss ...
  • Night sky at the Indian Astronomical Observatory during 2000-2008 
    Stalin, C. S; Hegde, M; Sahu, D. K; Parihar, P. S; Anupama, G. C; Bhatt, B. C; Prabhu, T. P (Astronomical Society of India, 2008-09)
    This paper presents an analysis of the optical night sky brightness and extinction coefficient measurements in UBVRI at the Indian Astronomical Observatory (IAO), Hanle, during the period 2000–2008. They are obtained from ...
  • Low-resolution spectroscopy of high galactic latitude objects: a search for CH stars 
    Goswami, A; Bama, P; Shantikumar, N. S; Devassy, D (Astronomical Society of India, 2007-09)
    Properties of CH stars like iron deficiency and enrichment of carbon and heavy elements can provide valuable inputs to our understanding of nucleosynthesis. In particular, these parameters provide strong observational ...
  • Studies of diffuse UV radiation 
    Sujatha, N. V; Murthy, J (Astronomical Society of India, 2007-06)
    The upcoming TAUVEX mission is expected to provide us with high quality data from observations over large parts of the sky in different wavelength bands. We propose to use this data for the study of diffuse radiation field ...
  • Active galaxies and their importance: results from imaging them in the UV 
    Shastri, P (Astronomical Society of India, 2007-06)
    The current phenomenology of active galaxies is briefly outlined. Their significance in the larger context of galaxy formation and evolution is de- scribed. Recent ultraviolet imaging results are then summarized in the ...
  • On the performance of a dual-beam polarimeter at Kodaikanal tower telescope 
    Nagaraju, K; Sankarasubramanian, K; Rangarajan, K. E; Ramesh, K. B; Singh, J; Devendran, P; Hariharan (Astronomical Society of India, 2008-09)
    Calibration and characterization of a dual-beam polarimeter installed at Kodaikanal Tower Telescope (KTT) for spectropolarimetric observations are presented in this paper. It was found that a slit width of 48 μ is optimum ...
  • Photometric and spectroscopic evolution of type II-P supernova SN 2004A 
    Gurugubelli, U. K; Sahu, D. K; Anupama, G. C; Chakradhari, N. K (Astronomical Society of India, 2008-09)
    We present optical photometry and spectroscopy of the normal type IIP supernova SN2004A, which was discovered in the galaxy NGC 6207 on 2004 January 9.84UT. Early observations indicated that the supernova was discovered ...
  • Some properties of merger remnants of interacting galaxies modeled as n = 4 polytrope 
    Namboodiri, P. M. S (Astronomical Society of India, 2008-03)
    Galaxies interact in a multitude of ways with their environ- ment. Such interactions can alter the morphological type of galaxies, trigger star formation and even produce active galactic nuclei. One of the important parameter ...
  • 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 ...
  • The nature of the compact object in quiescent SXTs 
    Sutaria, F. K; Kolb, U. C; Kuulkers, E; Charles, P; Chaty, S (American Institute of Physics, 2008-10)
    We report on the observation of two quiescent stage Soft X-ray transients-the BH-SXT GS1124-68 and the NS-SXT J2123-058.
  • Nebular phase observations of the type Ib supernova 2008D/X-ray transient 080109: side-viewed bipolar explosion 
    Tanaka, M; Yamanaka, M; Maeda, K; Kawabata, K. S; Hattori, T; Minezaki, T; Valenti, S; Valle, M. D; Sahu, D. K; Anupama, G. C; Tominaga, N; Nomoto, K; Mazzali, P. A; Pian, E (The American Astronomical Society, 2009-08)
    Abstract We present optical spectroscopic and photometric observations of supernova (SN) 2008D, associated with the luminous X-ray transient 080109, at >300 days after the explosion (nebular phases). We also give flux ...

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