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  • The Active Chromospheres of Lithium-rich Red Giant Stars* 
    Sneden, Christopher; Afsar, Melike; Bozkurt, Zeynep; Adamow, Monika; Mallick, Anohita; Reddy, B. E; Janowiecki, Steven; Mahadevan, Suvrath; Bowler, Brendan P; Hawkins, Keith; Lind, Karin; Dupree, Andrea K; Ninan, Joe P; Nagarajan, Neel; Topcu, Gamze Bocek; Froning, Cynthia S; Bender, Chad F; Terrien, Ryan; Ramsey, Lawrence W; Mace, Gregory N (American Astronomical Society, 2022-11-20)
    We have gathered near-infrared zyJ-band high-resolution spectra of nearly 300 field red giant stars with known lithium abundances in order to survey their He I λ10830 absorption strengths. This transition is an indicator ...
  • Active Galactic Nuclei and Galaxy Formation 
    Chokshi, A (The American Astronomical Society, 1997-12)
    It is proposed that early jet-induced activity around active galactic nuclei (AGNs) is responsible for triggering large-scale star formation in protogalaxies and results in the formation of giant ellipticals and spheroids ...
  • Active galactic nucleus activity and black hole masses in low surface brightness galaxies 
    Ramya, S; Prabhu, T. P; Mousumi Das (Wiley-Blackwell, 2011-12)
    We present medium resolution optical spectroscopy of a sample of nine low surface brightness (LSB) galaxies. For those that show clear signatures of active galactic nucleus (AGN) emission, we have disentangled the AGN ...
  • Active galactic nucleus feedback in NGC 3982 
    Joseph, P; George, K; Paul, K. T (EDP Sciences, 2022-11)
    The energetic feedback from supermassive black holes can influence star formation at the centres of galaxies. Observational evidence for active galactic nucleus (AGN) impact on star formation can be searched for in galaxies ...
  • 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 ...
  • Active mirror alignment control system for the MACE telescope 
    Kulgod, S. V; Pious, L; Chadda, V. K; Kaul, S. R; Yadav, K. K.; Koul, R (Astronomical Society of India, 2002)
    The conceptual design of an active mirror contol system for the MACE telescope, being set up by the Bhabha Atomic Research Centre at Mt. Abu, is described. Preliminary results obtained from recent laboratory trials are ...
  • Active nucleus in a post-starburst galaxy: KUG 1259+280 
    Dewangan, G. C; Singh, K. P; Mayya, Y. D; Anupama, G. C (The Royal Astronomical Society, 2000-10)
    We report the discovery of an active nucleus in a post-starburst galaxy, KUG 1259+280, based on its X-ray and optical characteristics. The X-ray source in KUG 1259+280 was detected during a search for ultrasoft sources in ...
  • Active prominences and associated terrestrial effects 
    Narayana, J. V (Government Observatory, Madras, 1963-10)
  • Activity dependence of solar supergranular fractal dimension 
    Paniveni, U; Krishan, V; Singh, J; Srikanth, R (Blackwell Publishing, 2010-02)
    We study the complexity of supergranular cells using the intensity patterns obtained at the Kodaikanal Solar Observatory during the solar maximum. Our data consist of visually identified supergranular cells, from which a ...
  • The activity in the isolated T Tauri binary V4046 Sagittarii 
    Mekkaden, M. V (International Astronomical Union, 2000)
    New photometric, spectroscopic and polarimetric observations of the T Tauri binary V4046 Sgr are presented. An analysis of the observations obtained over several seasons enabled us to determine the photometric period, and ...
  • Activity of the first interstellar comet 2I/Borisov around perihelion: results from Indian observatories 
    Aravind, K; Ganesh, Shashikiran; Venkataramani, Kumar; Sahu, D. K; Angchuk, D; Sivarani, T; Unni, Athira (Oxford University Press on behalf of the Royal Astronomical Society, 2021-04)
    Comet 2I/Borisov is the first true interstellar comet discovered. Here, we present results from observational programs at two Indian observatories, 2 m Himalayan Chandra Telescope at the Indian Astronomical Observatory, ...
  • Adaptive dynamics on circle maps 
    Sinha, S (Elsevier, 1994-04)
    We have studied a model of Sinha and Biswas of adaptive dynamics on a lattice of circle maps. The model reveals two remarkable features: First, even when the individual local elements are regular, the adaptive mechanisms ...
  • Adaptive friend of friends algorithm for identifying gravitationally bound cosmological structures 
    Gupta, Prateek; Paul, Surajit (American Physical Society, 2023-11-15)
    The Universe at the present epoch is found to be a network of matter over dense and under dense regions. Usually, the over dense regions are dominated by the dark-matter (DM) filaments where massive gravitationally bound ...
  • Adaptive optics and its applications 
    Mohan, D; Mishra, S. K; Saha, S. K (National Institute of Science Communication and Information Resources, 2005-06)
    The adaptive optics (AO) system combines technologies that enable corrections in real time for the deleterious effects of the atmosphere allowing terrestrial telescopes to achieve their near diffraction-limit. Such a system ...
  • Additional calibration of the ultraviolet imaging telescope on board AstroSat 
    Tandon, S. N; Postma, J; Joseph, P; Devaraj, A; Subramaniam, A; Subramaniam, I. V; George, K; Ghosh, S. K; Girish, V; Hutchings, J. B; Kamath, P. U; Kathiravan, S; Kumar, A; Lancelo, J. P; Leahy, D; Mahesh, P. K; Mohan, R; Nagabhushana, S; Pati, A. K; Kameswara Rao, N; Sankarasubramanian, K; Sriram, S; Stalin, C. S (IOP Publishing, 2020-04)
    Results of the initial calibration of the Ultra-Violet Imaging Telescope (UVIT) were reported earlier by Tandon et al. The results reported earlier were based on the ground calibration as well as the first observations in ...
  • Additional note on the measurement of lunar mountains 
    Ghosh, S. C (Astronomical Society of India, 1912-04)
  • Adiabatic cooling and nonthermal spectrum of blazars 
    Sahayanathan, S; Bhattacharyya, S; Kaul, C. L; Bhat, C. L (Astronomical Society of India, 2001)
    Here we study the effect of adiabatic cooling on the non-thermal synchrotron spectra of blazars from radio to X-ray region resulting when blazars are in the flaring state.
  • Aditya L1 to join ESA observatory and NASA probes 
    Deccan Herald (Deccan Herald, 2023-09-03)
  • Aditya' to study outer atmosphere of the sun by 2012 
    Deccan Herald (Deccan Herald, 2006-03-06)
  • Aditya-1 may help satellites dodge solar radiation 
    Divya Gandhi (The Hindu, 2009-09-08)

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