IIAP Publications: Recent submissions

  • 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    A previously unpublished ultralow-dispersion spectrum of Sand- uleak -69 202, the stellar progenitor of SN 1987A, is presented and the uncertain presupernova evolution of Sanduleak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 ...
  • An efficient modulation scheme for dual beam polarimetry 
    Nagaraju, K; Ramesh, K. B; Sankarasubramanian, K; Rangarajan, K. E (Astronomical Society of India, 2007-09)
    An eight stage balanced modulation scheme for dual beam polarimetry is presented in this paper. The four Stokes parameters are weighted equally in all the eight stages of modulation resulting in total polarimetric efficiency ...
  • Detection of IMBHs from microlensing in globular clusters 
    Safonova, M; Rahvar, S; Bond, I; Hearnshaw, J; Stalin, C. S (American Institute of Physics, 2008-10)
    Globular clusters have been long predicted to host intermediate-mass black holes (IMBHs) in their centres. The growing evidence that some/all Galactic globular clusters (GCs) could harbour middle range (10/sup2-10/sup4 ...
  • Post-Agb Candidates 
    Parthasarathy, M (Astronomical Society of the Pacific, 1993-01)
  • The chemical composition of post-Agb stars 
    Parthasarathy, M; Garcia-Lario, P; Pottasch, S. R (Astronomical Society of the Pacific, 1993-01)
  • The IUE ultraviolet spectrum of PC 11 
    Parthasarathy, M; Pottasch, S. R; Clavel, J (International Astronomical Union, 1993)
  • Green coronal emission and the global solar cycle 
    Sivaraman, K. R; Makarov, V. I (Astronomical Society of the Pacific, 1992)
  • 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 ...
  • Spectroscopic properties of post-AGB stars 
    Parthasarathy, M (Cambridge University Press, 2006)
    A review of the spectroscopic properties of post-AGB stars is presented.
  • Compressional Alfvén surface waves with inclined magnetic fields 
    Satya Narayanan, A (Indian Association for the Cultivation of Science, 1996-12)
    The properties of the Alfvén compressional waves are discussed for a cold plasma when the magnetic field is inclined at an angle to the interface where there is a sharp change in the densities of the plasma. The condition ...
  • Parsec-scale radio morphology in Seyfert galaxies 
    Lal, D. V; Shastri, P; Gabuzda, D. C (The Astronomical Society of the Pacific, 2001)
  • Geomagnetic effect associated with X-ray flare from Sco X-1 
    Sastri, J. H; Murthy, B. S (Nature Publishing Group, 1975-09)
    The possibility is examined that an X-ray flare from Sco X-1, detected during a balloon flight in 1967, had a daytime geomagnetic effect. There was uncertainty as to the cause of the geomagnetic effect because of a ...

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