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Browsing by Author "Sriram, S"

Browsing by Author "Sriram, S"

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  • A 10-m class national large optical-IR telescope 
    Anupama, G. C; Maheswar, G; Sriram, S; Sivarani, T; Parihar, P. S; Nagabhushana, S; Angchuk, D; Barway, Sudhanshu; Bhatt, B. C; Banyal, R. K; Basheer, Alikhan; Prasanna, Deshmukh; Divakar, D. K; Dorjai, T; Goswami, A; Govinda, K. V; Jorphail, S; Kamath, U. S; Kemkar, P. M. M; Mahay, T. T; Muneer, S; Muthumariappan, C; Shantikumar, N. S; Pandey, G; Reddy, B. E; Sahu, D. K; Sandeep, D. S; Ramya, S; Stalin, C. S; Subramanian, S; Tsewang, Stanzin; Subramaniam, A (Indian Academy of Science, 2022-06)
    An observatory class national large optical-IR telescope (NLOT), is proposed to be built and located in the country. The telescope consists of a 10–12 m segmented primary. In order to cater to a diversity of observational ...
  • 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 ...
  • ASTROSAT mission 
    Singh, Kulinder Pal; Tandon, S. N; Agrawal, P. C; Antia, H. M; Manchanda, R. K; Yadav, J. S; Seetha, S; Ramadevi, M. C; Rao, A. R; Bhattacharya, D; Paul, B; Sreekumar, P; Bhattacharyya, S; Stewart, G. C; Hutchings, J; Subramaniam, A; Ghosh, S. K; Murthy, J; Pati, A. K; Kameswara Rao, N; Stalin, C. S; Girish, V; Sankarasubramanian, K; Vadawale, S; Bhalerao, V. B; Dewangan, G. C; Dedhia, D. K; Hingar, M. K; Katoch, T. B; Kothare, A. T; Mirza, I; Mukerjee, K; Shah, H; Shah, P; Mohan, Rekhesh; Sangal, A. K; Nagabhusana, S; Sriram, S; Malkar, J. P; Sreekumar, S; Abbey, A. F; Hansford, G. M; Beardmore, A. P; Sharma, M. R; Murthy, S; Kulkarni, R; Meena, G; Babu, V. C; Postma, J (SPIE--The International Society for Optical Engineering, 2014-07)
    ASTROSAT is India’s first astronomy satellite that will carry an array of instruments capable of simultaneous observations in a broad range of wavelengths: from the visible, near ultraviolet (NUV), far-UV (FUV), soft X-rays ...
  • Atmospheric dispersion corrector for a multi-object spectroscopic mode of HROS-TMT 
    Manjunath, B; Hasan, Amirul; Divakar, Devika; Surya, Arun; Sriram, S; Sivarani, T; Prakash, A; Parvathy, M; Yadav, Sudharsan (SPIE-The International Society for Optical Engineering, 2023-10)
    Highly multiplexed spectroscopic surveys have changed the astronomy landscape in recent years. However, these surveys are limited to low and medium spectral resolution. High spectral resolution spectroscopy is often photon ...
  • Contamination control of UVIT 
    Kathiravan, S; Tandon, S. N; Prasad, B. R; Sriram, S; Pradeep, A; Vishnu, T; Mahesh, P. K; Kamath, P. U; Nagabhushana, S; Amit Kumar (Indian Academy of Sciences, 2021-10)
    Ultra Violet Imaging Telescope (UVIT) is one of the 5 instruments on AstroSat satellite, which was launched on September 28, 2015. UVIT was designed to make images with a resolution of <1.8′′, simultaneously in two ultraviolet ...
  • Design and modeling of a tunable spatial heterodyne spectrometer for emission line studies 
    Nirmal, K; Sridharan, R; Sriram, S; Murthy, J; Ambily, S; Safonova, M; Sreejith, A. G; Mathew, J; Mayuresh, Sarpotdar (SPIE--The International Society for Optical Engineering, 2018-04)
    Spatial heterodyne spectroscopy (SHS) is an interferometric technique similar to the Fourier transform spectroscopy with heritage from the Michelson interferometer. An imaging detector is used at the output of an SHS to ...
  • Estimation and correction of the instrumental perturbations of Vainu Bappu Telescope Echelle spectrograph using a model-based approach 
    Chamarthi, Sireesha; Banyal, R. K; Sriram, S (SPIE-The International Society for Optical Engineering, 2019-11)
    The Echelle spectrograph operating at Vainu Bappu Telescope (VBT), India, is a general purpose instrument used for many high-resolution spectroscopic observations. A concerted effort is being made to expand the scientific ...
  • Estimation of asymmetries in point spread function for the echelle spectrograph operating at Vainu Bappu Telescope for high precision radial velocity studies 
    Sireesha, C; Banyal, R. K; Sriram, S (SPIE--The International Society for Optical Engineering, 2018-07)
    Precision in the Radial Velocity (RV) measurements depends upon the efficiency of the technique to remove instrumental artifacts from stellar measurements. Iodine absorption cell technique is being implemented for high ...
  • Estimation of polarization aberrations and its effect on the point spread function of the Thirty Meter Telescope 
    Ramya, M. Anche; Anupama, G. C; Sriram, S; Sankarasubramanian, K; Skidmore, W (SPIE--The International Society for Optical Engineering, 2018-07)
    The Thirty Meter Telescope (TMT) is a future generation telescope proposed to be located in Mauna Kea, Hawaii or in La Palma in the Canary Islands. The telescope will have a segmented primary and an inclined tertiary mirror. ...
  • Fiber-fed echelle spectrometer of the 2.34 meter Vainu Bappu Telescope 
    Kameswara Rao, N; Sriram, S; Gabriel, F; Prasad, B. R; Samson, J. P. A; Jayakumar, K; Srinivasan, R; Mahesh, P. K; Giridhar, S (Anita Publications, 2004-12)
    The optical design and performance of high resolution fiber-fed echelle spectrometer for the 2.34 meter Vainu Bappu Telescope (VBT) is described. An optical fiber of core 100 J-Lm and length 45 meter is used to link the ...
  • Flexure compensation simulation tool for TMT-WFOS spectrograph 
    Surya, Arun; Radovan, Matthew; Sivarani, T; Sriram, S; Devika, Divakar; Fucik, Jason (SPIE--The International Society for Optical Engineering, 2018-07)
    The Wide Field Optical Spectrograph (WFOS) is one of the first-light instruments of Thirty Meter Telescope. It is a medium resolution, multi object, wide field optical spectrograph. Since 2005 the conceptual design of the ...
  • Hanle echelle spectrograph: design and performance 
    Sriram, S; Amit Kumar; Arun Surya; Sivarani, T; Giridhar, S; Kathiravan, S; Anand, M. N; Jones, D; Grobler, D; Jakobsson, R; Anantha, Ch; Athira Unni; Angchuk, D; Tsewang, D; Gyalson, T (SPIE-The International Society for Optical Engineering, 2018-07-06)
    Hanle echelle spectrograph (HESP) is a high resolution, bench mounted, fiber-fed spectrograph at visible wavelengths. The instrument was recently installed at the 2m Himalayan Chandra Telescope (HCT), located at Indian ...
  • High Resolution Stellar Spectroscopy with VBT Echelle Spectrometer 
    Kameswara Rao, N; Sriram, S; Jayakumar, K; Gabriel, F (Indian Academy of Sciences, 2005-09)
    The optical design and performance of the recently commissioned fiber fed echelle spectrometer of 2.34 meter Vainu Bappu Telescope are described. The use of it for stellar spectroscopic studies is discussed.
  • 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 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 ...
  • India-TMT project—science instrumentation program 
    Sivarani, T; Ramya, S; Sriram, S; Divakar, Devika; Surya, Arun; Varshney, Hari Mohan; Kambala, Sudarshan; Hasan, Amirul; Prakash, A; Govinda, K. V; Viswanatha; Anupama, G. C; Maheswar, G; Ojha, D; Pandey, S. B; Pandey, J; Puravankara, M; Ramaprakash, A. N; Reddy, B. E; Shah, Sarang; Srianand, R; Subramaniam, A; Subramanian, S (Indian Academy of Sciences, 2022-12)
    The future of astronomy in the coming decades will be shaped by the upcoming three extremely large optical telescopes, the Thirty Meter Telescope (TMT), the Giant Magellan Telescope (GMT) and the European Large Telescope ...
  • Indian spectroscopic and imaging space telescope (INSIST): An optics design trade-off study 
    Sriram, S; Valsan, Vineeth; Subramaniam, A; Vishnu, Unni. C; Maheswar, G; Chand, Totan (Indian Academy of Sciences, 2023-12)
    Large ground and space-based surveys in optical and near-infrared (NIR) wavelengths will revolutionize astronomy in the coming decade. Unfortunately, no ultraviolet (UV) facilities are planned to complement these surveys, ...
  • Mapping distortion of detectors in UVIT onboard astroSat observatory 
    Girish, V; Tandon, S. N; Sriram, S; Amit Kumar; Postma, J (Springer, 2017-02)
    Ultraviolet Imaging Telescope (UVIT) is one of the payloads onboard AstroSat, India’s first multi-wavelength Astronomy mission. UVIT is primarily designed to make high resolution images in wide field, in three wavelength ...
  • Opto-mechanical assembly and ground calibration of LUCI 
    Mathew, J; Nair, B. G; Sriram, S; Kamath, P. U; Prakash, A; Mayuresh, Sarpotdar; Ambily, S; Nirmal, K; Sreejith, A. G; Safonova, M; Murthy, J; Brosch, N (SPIE--The International Society for Optical Engineering, 2018-08-20)
    The Lunar Ultraviolet Cosmic Imager (LUCI) is an innovative all-spherical mirrors telescope, proposed to fly as a scientific UV imaging payload on a lunar mission in collaboration with Indian Aerospace Company-TeamIndus, ...

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