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Browsing IIAP Publications by Title

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  • Evolution of Hen 3-1357, the Stingray Nebula 
    Pena, Miriam; Parthasarathy, M; Ruiz-Escobedo, Francisco (Oxford University Press on behalf of Royal Astronomical Society, 2022-09)
    The spectroscopic evolution of Hen 3-1357, the Stingray Nebula, is presented by analysing data from 1990 to 2021. High-resolution data obtained in 2021 with South African Large Telescope High Resolution Spectrograph and ...
  • Evolution of Kelvin–Helmholtz Instability in the Fan-spine Topology 
    Mishra, S. K; Singh, Balveer; Srivastava, A. K; Kayshap, Pradeep; Dwivedi, B. N (IOP Publishing, 2021-12-10)
    We use multiwavelength imaging observations from the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory to study the evolution of the Kelvin–Helmholtz (K–H) instability in a fan-spine magnetic field ...
  • Evolution of latitude zonal structure of the large-scale magnetic field in solar cycles 
    Makarov, V. I; Sivaraman, K. R (Springer, 1989-03)
    The latitude zonal component of the large-scale solar magnetic field is analyzed using H-alpha charts for the 1905-1982 period, and the poleward migration of prominences is used to calculate the time of reversal of the ...
  • Evolution of Lithium Abundance in Pop I Giants 
    Mallik, S. G. V (International Astronomical Union, 2000)
    Recent observations of cool giants have shown that there exists a large range in their lithium abundances even for apparently similar stars. In order to explore whether this large spread could be interpreted in terms of ...
  • Evolution of lithium in low-mass giants: an observational perspective 
    Bharat Kumar, Yerra; Reddy, B. E (Indian Academy of Sciences, 2020-12)
    The overabundance of lithium in low-mass red giants has been a topic of interest for over four decades. Low-mass stars are expected to destroy lithium gradually throughout their lifetimes. Against this expectation, about ...
  • Evolution of low-frequency quasi-periodic oscillations in GX 339-4 during its 2021 outburst using AstroSat data 
    Mondal, Santanu; Salgundi, Anirudh; Chatterjee, Debjit; Jana, Arghajit; Chang, H. K; Naik, Sachindra (Oxford University Press on behalf of Royal Astronomical Society, 2023-12)
    The black hole X-ray binary GX 339-4 showed an X-ray outburst during 2021. The AstroSat captured this outburst when the source entered into the intermediate flux state while the count rate was declining. The source showed ...
  • Evolution of magnetic field twist and tilt in active region NOAA 10930 
    Ravindra, B; Venkatakrishnan, P; Tiwari, S. K (World Scientific Publishing Company, 2010)
    Magnetic twist of the active region has been measured over a decade using photospheric vector field data, chromospheric Hα data, and coronal loop data. The twist and tilt of the active regions have been measured at the ...
  • Evolution of Optical Spectrum of SN 1987A 
    Kameswara Rao, N (Indian Institute of Astrophysics, 1988)
    The initial reaction to the spectroscopic behaviour of SN 1987A was that it is a very untypical SN II but after a year, it is said that it is not peculiar after all. Only it went through various stages very fast and that ...
  • Evolution of primordial dark matter planets in the early Universe 
    Kiren, O. V; Arun, K; Sivarani, C (Elsevier B. V, 2021-08-15)
    In a recent paper we had discussed possibility of DM at high redshifts forming primordial planets composed entirely of DM to be oneof the reasons for not detecting DM (as the flux of ambient DM particles would be consequently ...
  • Evolution of research in different astronomies in India 
    Bhattacharyya, J. C (The Council of Scientific and Industrial Research, 1986-10)
    The evolution of astronomical studies is reviewed with special reference to important achievements on Indian soil since the introduction of telescopic observations in the early seventeenth century. Important activities ...
  • Evolution of Spinning and Braiding Helicity Fluxes in Solar Active Region NOAA 10930 
    Ravindra, B; Yoshimura, K; Dasso, S (IOP Publishing, 2011-12-10)
    The line-of-sight magnetograms from Solar Optical Telescope Narrowband Filter Imager observations of NOAA Active Region 10930 have been used to study the evolution of spinning and braiding helicities over a period of five ...
  • Evolution of starspot regions in DM UMa 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V; Hall, D. S; Henry, G. W (Kluwer Academic Publishers, 1985-10)
    B andV photometry of DM UMa obtained between January, 1980 and June, 1984 is presented. Analysis yields a mean photometric period 7d.478±0d.010, compared to the known oribital period of 7d.492±0d.009. Light curves obtained ...
  • Evolution of the active region NOAA 10570 associated with the flares 
    Sundararaman, K; Ramesh, K. B; Selvendran, R (Anita Publications, 2004-12)
    The structure and evolution of the photospheric magnetic fields observed in the active region NOAA 10570 are analyzed using Kodaikanal photoheliogram and spectroheliogram data. It is attempted to evaluate the shear angle ...
  • Evolution of the Hub-filament Structures in IC 5146 in the Context of the Energy Balance of Gravity, Turbulence, and Magnetic Field 
    Chung, Eun Jung; Lee, Chang Won; Kwon, Woojin; Yoo, Hyunju; Archana Soam; Cho, Jungyeon (American Astronomical Society, 2022-11-01)
    We present the results of 850 μm polarization and C18O (3 − 2) line observations toward the western hub-filament structure (W-HFS) of the dark Streamer in IC 5146 using the James Clerk Maxwell Telescope SCUBA-2/POL-2 and ...
  • The evolution of the Milky Way: new insights from open clusters 
    Reddy, A. B. S; Lambert, D. L; Giridhar, S (Oxford University Press on behalf of the Royal Astronomical Society, 2016-12)
    We have collected high-dispersion echelle spectra of red giant members in the 12 open clusters (OCs) and derived stellar parameters and chemical abundances for 26 species by either line equivalent widths or synthetic ...
  • Evolution of the M•-σ relation 
    Bhattacharyya, D; Mangalam, A (Cambridge University Press, 2018-05)
    Black holes at the centers of the galaxies grow mainly by the processes of accretion, mergers, and consumption of stars. In the case of gas accretion with cooling sources, the flow is momentum driven, after which the black ...
  • The evolution of the Net Twist Current and the Net Shear Current in active region NOAA 10930 
    Suthar, Y; Venkatakrishnan, P; Ravindra, B; Jaaffrey, S. N. A (Springer, 2014-07)
    The electric current exists because of the non-potential magnetic field in solar active regions. We present the evolution of net current in the solar active region NOAA 10930 as the sum of shear current and twist current ...
  • Evolution of the optical spectrum of SN 1987a in the Large Magellanic Cloud 
    Ashoka, B. N; Anupama, G. C; Prabhu, T. P; Giridhar, S; Ghosh, K. K; Jain, S. K; Pati, A. K; Kameswara Rao, N (Indian Academy of Sciences, 1987-06)
    The evolution of the spectrum of SN 1987a is traced from 1987 February 26 to March 31. Based on the low-resolution spectroscopic data the authors identify the lines of H, He I, Na I, Fe II, Sc II, Ca II which are known to ...
  • The Evolution of the Peculiar Type Ia Supernova SN 2005hk over 400 Days 
    Sahu, D. K; Tanaka, M; Anupama, G. C; Kawabata, K. S; Maeda, K; Tominaga, N; Nomoto, K; Mazzali, P. A; Prabhu, T. P (The American Astronomical Society, 2008-06-10)
    UBVRI photometry and medium-resolution optical spectroscopy of the peculiar Type Ia supernova SN 2005hk are presented and analyzed, covering the premaximum phase to around 400 days after explosion. The supernova is found ...
  • Evolution of the Sun's activity and the poleward transport of remnant magnetic flux in Cycles 21-24 
    Mordvinov, Alexander V; Karak, Bidya Binay; Banerjee, D; Golubeva, Elena M; Khlystova, Anna I; Zhukova, Anastasiya V.; Kumar, Pawan (Oxford University Press on behalf of Royal Astronomical Society, 2022-02)
    Detailed study of the solar magnetic field is crucial to understand its generation, transport, and reversals. The timing of the reversals may have implications on space weather and thus identification of the temporal ...

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