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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Upper mass limit for neutron star stability against black hole formation 
    Krishan, V; Kumar, N (D.Reidel Publishing Co.,, 1978-08)
    Starting from the exact general relativistic expression for the total energy of selfgravitating spherically distributed matter and using the minimum energy principle, we calculate the upper mass limit for a neutron star ...
  • Uranus and the Invisible Planets 
    Kochhar, R. K (Royal Astronomical Society, 1987-12)
  • Use of Lasers in Satellite to Earth Communication Link 
    Sundar Kumar Iyer, S; Mukunda Rao, M (Indian Institute of Astrophysics, Bangalore, 1991)
    With the growing demand of communication requirement all over the world, there is no way out to go in for higher carrier frequencies. A far sighted move be to in for laser communication links in areas like earth to satellite ...
  • Using an artificial neural network to classify multicomponent emission lines with integral field spectroscopy from SAMI and S7 
    Hampton, E. J; Medling, A. M; Groves, B; Kewley, L; Dopita, M; Davies, R; Ho, I-Ting; Kaasinen, M; Leslie, S; Sharp, R; Sweet, S. M; Thomas, A. (Oxford University Press on behalf of the Royal Astronomical Society, 2017-09)
    Integral field spectroscopy (IFS) surveys are changing how we study galaxies and are creating vastly more spectroscopic data available than before. The large number of resulting spectra makes visual inspection of emission ...
  • Using an Artsimovich Railgun for return from the Moon 
    Sazhin, M. V; Safonova, M. V; Sementsov, V. N (Springer, 2021-05)
    Nonstandard techniques to deliver a payload from the Moon to Earth are explored. Two approaches are compared, which are based on using a space elevator and an acceleration device, the Artsimovich railgun. The energy needed ...
  • UV (IUE) spectra of the central stars of high latitude planetary nebulae Hb7 and Sp3 
    Gauba, G; Parthasarathy, M; Nakada, Y; Fujii, T (EDP Sciences, 2001-07)
    We present an analysis of the UV (IUE) spectra of the central stars of Hb7 and Sp3. Comparison with the IUE spectrum of the standard star HD 93205 leads to a spectral classification of O3V for these stars, with an effective ...
  • The UV (IUE) spectrum of the planetary nebula PC 11 (HD 149427) 
    Parthasarathy, M; García-Lario, P; Pottasch, S. R; de Martino, D; Surendiranath, R (European Southern Observatory, 2000-03)
    The UV spectrum of PC 11 is found to show variations in the strength of the O III] 1666Å , N III] 1750Å and C III] 1909Å emission lines. The detection of continuum emission in the wavelength interval 2650Å to 3200Å indicates ...
  • UV astronomy and stellar chromosphere 
    Kameswara Rao, N (Saha Institute of Nuclear Physics, 1995)
    "The abrupt termination of solar and stellar spectrum below A 2900 has been a great handicap to the advancement of our knowledge of the heavenly bodies ; because the ...
  • UV facilities for the investigation of the origin of life 
    de Castro, Ana I Gómez; Barstow, Martin A; Brosch, Noah; Coté, Patrick; France, Kevin; Heap, Sara; Hutchings, John; Koriski, S; Murthy, J; Neiner, Coralie; Roberge, Aki; Román-Duval, Julia; Rowe, Jason; Sachkov, Mikhail; Schkolnik, Evgenya; Shustov, Boris (Elsevier, 2021)
    This contribution summarizes the status and capabilities of current and future UV facilities for the investigation of the origin of life. The main operational project for UV astronomy is the Hubble Space Telescope with ...
  • UV imaging telescope for the Indian Multiwavelength Astronomy Satellite 
    Pati, A. K; Kameswara Rao, N (SPIE-The International Society for Optical Engineering, 1998-08)
    The UV Imaging Telescope is a part of the proposed Indian Multiwavelength Astronomy Satellite mission. The initiate for an astronomy mission has ben taken by several institution in India, after the successful demonstration ...
  • 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 ...
  • UV photometry of spotted stars in the horizontal branch of the globular cluster NGC 2808 using AstroSat 
    Deepthi, S. Prabhu; Subramaniam, A; Snehalata Sahu (Indian Academy of Science, 2021-10)
    A recent study of hot (20,000 to 30,000 K) extreme horizontal branch (EHB) stars in globular clusters (GCs) has led to the discovery of their variability. It is suggested that this variability is driven by the projected ...
  • The UV spectrum of the WC 11 star CPD -56 deg 8032 
    Kameswara Rao, N; Giridhar, S; Nandy, K (The European Southern Observatory, 1990-08)
    UV observations of the WC 11 central star of the compact planetary nebula CPD -56 deg 8032 show that the continuum flux is variable. This variability appears to be caused by a change in the circumstellar extinction properties. ...
  • UV(IUE) spectra of hot post-AGB candidates 
    Gauba, G; Parthasarathy, M (The European Southern Observatory, 2003-09)
    Analysis of the low resolution UV(IUE) spectra (1150 to 3200 Å) of 15 hot post-AGB candidates is presented. The UV(IUE) spectra of 10 stars suggest partial obscuration of the hot stars due to circumstellar dust. The reddened ...
  • UVIT imaging of WLM: demographics of star-forming regions in the nearby dwarf irregular galaxy 
    Mondal, Chayan; Subramaniam, A; George, K (IOP Publishing, 2018-09)
    We present a study of star-forming regions and their demographics in the nearby dwarf irregular galaxy WLM using Ultraviolet Imaging Telescope (UVIT) multiband observations in three filters, F148W, N245M, and N263M. We ...
  • A UVIT Look at Star Formation in Nearby Interacting/Merging Galaxies 
    Mousumi Das (Cambridge University Press on behalf of International Astronomical Union, 2023)
    The interactions and mergers of gas rich galaxies are known to produce star formation which often leads to nuclear activity as well. The star formation is ideally mapped using FUV and NUV emission, since UV traces star ...
  • UVIT observation of Milky Way satellite galaxy Reticulum II 
    Divakar, D. K; Sivarani, T; Doddamani, V. H (Indian Academy of Sciences, 2021-10)
    We present the UV photometry of one of the Ultra-Faint Dwarf (UFD) Milky Way (MW) satellite galaxies, Reticulum II, using images acquired with the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat. Reticulum II is ...
  • UVIT Observations of the Small Magellanic Cloud: Point-source Catalog 
    Devaraj, A; Joseph, P; Stalin, C. S; Tandon, S. N; Ghosh, S. K (American Astronomical Society, 2023-04-01)
    Three fields in the outskirts of the Small Magellanic Cloud were observed by the UltraViolet Imaging Telescope (UVIT) on board AstroSat, between 2017 December 31 and 2018 January 1. The observations were carried out on a ...
  • UVIT observations of the star-forming ring in NGC 7252: Evidence of possible AGN feedback suppressing central star formation 
    George, K; Joseph, P; Mondal, Chayan; Devaraj, A; Subramaniam, A; Stalin, C. S; Cote, P; Ghosh, S. K; Hutchings, J. B; Mohan, Rekhesh; Postma, J; Sankarasubramanian, K; Sreekumar, P; Tandon, S. N (EDP Sciences, 2018-05)
    Context. Some post-merger galaxies are known to undergo a starburst phase that quickly depletes the gas reservoir and turns it into a red-sequence galaxy, though the details are still unclear. Aims. Here we explore the ...
  • UVIT observations of UV-Bright stars in four Galactic Globular Clusters 
    Kumar, R; Pradhan, A. C; Parthasarathy, M; Ojha, D. K; Mohapatra, A; Murthy, J (Cambridge University Press, 2019-05)
    We have performed photometric analysis of four Galactic globular clusters (GGCs): NGC 4147, NGC 4590, NGC 5053 and NGC 7492 using far-UV and near-UV filters of the Ultraviolet Imaging Telescope (UVIT) on-board AstroSat. ...

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