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  • Important parameters of four small-amplitude cepheids from uvby photometry 
    Arellano Ferro, A; Giridhar, S; Parrao, L (Konkoly Observatory, 1987-08)
  • Improved characterization of intranight optical variability of prominent AGN classes 
    Goyal, A; Gopal-Krishna; Wiita, P. J; Stalin, C. S; Sagar, R (Oxford University Press on behalf of the Royal Astronomical Society, 2013-10-21)
    The incidence of intranight optical variability (INOV) is known to differ significantly among different classes of powerful active galactic nuclei (AGN). A number of statistical methods have been employed in the literature ...
  • An improved gnomon 
    Ratna, V (Astronomical Society of India, 1998)
    During a project work done by a group of students at senior secondary stage with the guidance of the author, the vertical pillar kind of gnomon has been improved upon. Whereas the traditional gnomon can measure altitude ...
  • Improved iteratively weighted centroiding for accurate spot detection in laser guide star based Shack Hartmann sensor 
    Vyas, A; Roopashree, M. B; Prasad, B. R (SPIE-The International Society for Optical Engineering, 2010-02)
    A hybrid centroiding technique involving Iteratively Weighted Center of Gravity (IWCoG) algorithm and correlation technique for a Laser Guide Star (LGS) based Shack Hartmann wavefront sensor is proposed. A simple method ...
  • An improved spectroscopic orbit for HD 75767 
    Griffin, R. F (Astronomical Society of India, 1991)
    HD 75767 is a sixth-magnitude solar-type star for which Sanford gave an orbit in 1931 on the basis of 37 low-dispersion Mount Wilson spectrograms. The orbit has a period of 10 days and was attributed a small eccentricity. ...
  • An improved Technique to Explore Disk Accretion Process in PMS Stars 
    Parihar, P. S (Springer, 2010)
    The low mass PMS stars are found to be surrounded by thick, flared accretion disk and the disk material is supposed to be funneled onto the stellar surface by strong and predominately dipolar magnetic field. We have developed ...
  • Improved virtual orbital multireference Møller–Plesset study of the ground and excited electronic states of protonated acetylene, C2H 
    Chaudhuri, R. K; Feed, K. F (American Institute of Physics, 2008-08-07)
    The ground state geometries and associated normal mode frequencies of the classical and nonclassical protonated acetylene ion, i.e., the vinyl cation C2H, are computed using the complete active space self-consistent field ...
  • Improved virtual orbitals in state specific multireference perturbation theory for prototypes of quasidegenerate electronic structure 
    Sinha Ray, S; Ghosh, P; Chaudhuri, R. K; Chattopadhyay, S (American Institute of Physics, 2017-02)
    The state-specific multireference perturbation theory (SSMRPT) with an improved virtual orbital complete active space configuration interaction (IVO-CASCI) reference function [called as IVO-SSMRPT] is used to investigate ...
  • Improving the image quality at the calcium K and hydrozen spectroheliographs at the Kodaikanal Observatory 
    Singh, J; Aleem, P. S. M; Nagabhushana, B. S (Indian Institute of Astrophysics, 1988-01)
  • Improving the throughput of telescope by adaptive optics methods 
    Chinnappan, V; Saxena, A. K; Sreenivasan, A (Astronomical Society of India, 1998)
  • In defence of scientific temper 
    Banyal, R. K (Indian Academy of Sciences, 2009-07-10)
  • In fl uence of Wolf – Rayet Stars on Surrounding Star-forming Molecular Clouds 
    Baug, T; Richard de Grijs; Dewangan, L. K; Herczeg, Gregory J; Ojha, D. K; Ke Wang; Licai Deng; Bhatt, B. C (IOP Publishing, 2019-11)
    We investigate the in fl uence of Wolf – Rayet ( W-R ) stars on their surrounding star-forming molecular clouds. We study fi ve regions containing W-R stars in the inner Galactic plane ( l ∼ [ 14 ° ...
  • In pursuit of science 
    Varma, R. K (Astronomical Society of India, 1997)
  • In Search of Short Gamma-Ray Burst Optical Counterparts with the Zwicky Transient Facility 
    Ahumada, Tomás; Anand, Shreya; Coughlin, Michael W; Andreoni, Igor; Kool, Erik C; Kumar, Harsh; Reusch, Simeon; Sagués-Carracedo, Ana; Stein, Robert; Cenko, Bradley S; Kasliwal, Mansi M; Singer, Leo P; Dunwoody, Rachel; Mangan, Joseph; Bhalerao, Varun; Bulla, Mattia; Burns, Eric; Graham, Matthew J; Kaplan, David L; Perley, Daniel; Almualla, Mouza; Bloom, Joshua S; Cunningham, Virginia; De, Kishalay; Gatkine, Pradip; Ho, Anna Y. Q; Karambelkar, Viraj; Kong, Albert K. H; Yao, Yuhan; Anupama, G. C; Barway, Sudhanshu; Ghosh, Shaon; Itoh, Ryosuke; McBreen, Sheila; Bellm, Eric C; Fremling, Christoffer; Laher, Russ R; Mahabal, Ashish A; Riddle, Reed L; Rosnet, Philippe; Rusholme, Ben; Smith, Roger; Sollerman, Jesper; Bissaldi, Elisabetta; Fletcher, Corinne; Hamburg, Rachel; Mailyan, Bagrat; Malacaria, Christian; Roberts, Oliver (American Astronomical Society, 2022-06-10)
    The Fermi Gamma-ray Burst Monitor (GBM) triggers on-board in response to ∼40 short gamma-ray bursts (SGRBs) per year; however, their large localization regions have made the search for optical counterparts a challenging ...
  • In second action by ISTRAC, Aditya-L1 enters new orbit 
    The Hindu (The Hindu, 2023-09-06)
  • In-orbit Calibrations of the Ultraviolet Imaging Telescope 
    Tandon, S. N; Subramaniam, A; Girish, V; Postma, J; Sankarasubramanian, K; Sriram, S; Stalin, C. S; Mondal, Chayan; Sahu, S; Joseph, P; Hutchings, J; Ghosh, S. K; Barve, Indrajit V; George, K; Kamath, P. U; Kathiravan, S; Kumar, A; Lancelot, J. P; Leahy, D; Mahesh, P. K; Mohan, Rekhesh; Nagabhushana, S; Pati, A. K; Kameswara Rao, N; Sreedhar, Yuvraj Harsha; Sreekumar, P (IOP Publishing, 2017-09)
    The Ultra-Violet Imaging Telescope (UVIT) is one of the payloads in ASTROSAT, the first Indian Space Observatory. The UVIT instrument has two 375 mm telescopes: one for the far-ultraviolet (FUV) channel (1300–1800 Å), ...
  • In-orbit performance of UVIT and first results 
    Tandon, S. N; Hutchings, J. B; Ghosh, S. K; Subramaniam, A; George, K|; Girish, V; Kamath, P. U; Kathiravan, S; Kumar, A; Lancelot, J.P; Mahesh, P. K; Mohan, Rekhesh; Murthy, J; Nagabhushana, S; Pati, A. K; Postma, J; Kameswara Rao, N; Sankarasubramanian, K; Sreekumar, P; Sriram, S; Stalin, C. S; Sutaria, F. K; Sreedhar, Yuvraj Harsha; Barve, Indrajit V; Mondal, Chayan; Snehalata Sahu (Indian Academy of Sciences, 2017-06)
    The performance of the ultraviolet telescope (UVIT) on-board AstroSat is reported. The performance in orbit is also compared with estimates made from the calibrations done on the ground. The sensitivity is found to be ...
  • In-orbit performance of UVIT on ASTROSAT 
    Subramaniam, A; Tandon, S. N; Hutchings, J; Ghosh, S. K; George, K; Girish, V; Kamath, P. U; Kathiravan, S; Kumar, Amit; Lancelot, J. P; Mahesh, P (SPIE--The International Society for Optical Engineering, 2016-07)
    We present the in-orbit performance and the first results from the ultra-violet Imaging telescope (UVIT) on ASTROSAT. UVIT consists of two identical 38cm coaligned telescopes, one for the FUV channel (130-180nm) and the ...
  • In-orbit performance of UVIT over the past 5 years 
    Ghosh, S. K; Joseph, P; Kumar, A; Postma, J; Stalin, C. S; Subramaniam, A; Tandon, S. N; Barve, Indrajit V; Devaraj, A; George, K; Girish, V; Hutchings, J. B; Kamath, P. U; Kathiravan, S; Lancelot, J. P; Leahy, D; Mahesh, P. K; Mohan, R; Nagabhushana, S; Pati, A. K; Kameswara Rao, N; Sankarasubramanian, K; Sreekumar, P; Sriram, S (Indian Academy of Sciences, 2021-10)
    Over the last 5 years, UVIT has completed observations of more than 500 proposals with ∼800 unique pointings. In addition, regular planned monitoring observations have been made and from their analysis various key parameters ...
  • The inconsistency of a model for internal structure or black holes 
    Sivaram, C (Indian Academy of Sciences, 1985-08)
    The recent claim that a black hole can be treated as a relativistic gas of micro black holes (planckions) is shown to be physically inconsistent and in fact is grossly in error. Any deductions made about black holes from ...

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