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Browsing IIAP Publications by Title

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  • 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 ...
  • Design and Performance of a Low-Frequency Cross-Polarized Log-Periodic Dipole Antenna 
    Sasikumar Raja, K; Kathiravan, C; Ramesh, R; Rajalingam, M; Barve, Indrajit V (IOP Publishing, 2013-07)
    We report the design and performance of a cross-polarized log-periodic dipole (CLPD) antenna for observations of polarized radio emission from the solar corona at low frequencies. The measured isolation between the two ...
  • Design and Performance of V.H.F. receiving equipment for reception of extremely weak signals of solar and Galactic origin in the metre wavelength region 
    Bhargava, B. N; Jayarajan, A. P (IETE, 1960)
    Three V.H.F receivers of high gain stability and low internal noise designed and constructed at the Kodaikanal Observatory are described. The receivers which operate at 1 1/2, 3 and 5 meter wavelengths are being used for ...
  • Design and test of a high-resolution EUV spectroheliometer 
    Berger, T. E; Timothy, J. G; Walker II, A. B. C; Kirby, H; Morgan, J. S; Jain, S. K; Saxena, A. K; Huber, M. H; Tondello, G; Naletto, G (SPIE-The International Society for Optical Engineering, 1992)
    The HiRES High-Resolution EUV Spectroheliometer is a sounding rocket instrument yielding very high spatial, spectral, and temporal resolution images of the solar outer atmosphere, on the basis of a 45-cm Gregorian telescope ...
  • Design concepts of EUV polarimeter 
    Khan, Raveena; Nagaraju, K; Phanindra, DVS (SPIE-The International Society for Optical Engineering, 2023-10)
    The solar corona is a complex and dynamic region primarily controlled by the magnetic fields. Hence the routine measurement of these fields is crucial. Magnetic field information remains embedded in the polarization profiles ...
  • Design considerations of an inductive sensor for segmented mirror telescopes 
    Kumar, Varun; Parihar, P; Athul, Nakulan; Arjun, Manoharan (SPIE--The International Society for Optical Engineering, 2018-07)
    The Segmented mirror technology has become natural choice for any optical telescope larger than 8 meter in size, where small mirror segments are aligned and positioned with respect to each other to an accuracy of few tens ...
  • Design of a mammary gland specific gamma imaging system (MSGIS) 
    Sarbajit, P; Bhattacharjee, T; Saha, S. K (Macmillan Publishers India Ltd., 2009)
    In conventional X-ray mammography, the presences of a small lesion/tumor at the early stage of cancer are not definitely detected because of the complex anatomy of the breast tissues. On the other hand, the low resolution ...
  • Design of an IR imaging channel for the Keck Observatory SCALES instrument 
    Banyal, R. K; Hasan, Armirul; Kupke, Reni; Varshney, Hari Mohan; Prakaesh, Ajin; Sivarani, T; Skemer, Andy J; MacDonald, Nick; Sallum, Steph; Deich, Will; Fitzgerald, Michael P; Govinda, K. V; Ratliff, Chris; Ramya, S; Stelter, Deno; Surya, Arun; Wang, Eric (SPIE-The International Society for Optical Engineering, 2022-08)
    A next-generation instrument named, Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy (SCALES), is being planned for the W. M. Keck Observatory. SCALES will have an integral field spectrograph (IFS) and a ...
  • Design of SCALES: a 2-5 micron coronagraphic integral field spectrograph for Keck Observatory 
    Skemer, Andrew J; Stelter, R. Deno; Sallum, Stephanie; MacDonald, Nicholas; Kupke, Renate; Ratliff, Christopher; Banyal, R. K; Hasan, Amirul; Varshney, Hari Mohan; Surya, Arun; Prakaesh, Ajin; Sivarani, T; Ramya, S; Govinda, K. V; Fitzgerald, Michael P; Wang, Eric; Kassis, Marc; Absil, Olivier; Alvarez, Carlos; Batalha, Natasha; Boucher, Marc-Andre; Bourgenot, Cyril; Brandt, Timothy; Briesemeister, Zackery; Kleer, Katherine de; Pater, Imke de; Deich, William; Divakar, Devika; Filion, Guillaume; Gauvin, Etienne; Gonzales, Michael; Greene, Thomas; Hinz, Philip; Jensen-Clem, Rebecca; Johnson, Christopher; Kain, Isabel; Kruglikov, Gabriel; Lach, Mackenzie; Landry, Jean-Thomas; Li, Jialin; Liu, Michael C; Lyke, James; Magnon, Kenneth; Marin, Eduardo; Martin, Emily; Martinez, Raquel; Mawet, Dimitri; Miles, Brittany; Sandford, Dale; Sheehan, Patrick; Sohn, Ji Man; Stone, Jordan (SPIE-The International Society for Optical Engineering, 2022-08)
    We present the design of SCALES (Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy) a new 2-5 micron coronagraphic integral field spectrograph under construction for Keck Observatory. SCALES enables ...
  • Design, development, and validation of a segment support actuator for the prototype segmented mirror telescope 
    Deshmukh, P. G; Mandal, A; Parihar, P. S; Nayak, D; Mishra, Deepta Sundar (SPIE-The International Society for Optical Engineering, 2018-01)
    Segmented mirror telescopes (SMT) are built using several small hexagonal mirrors positioned and aligned by the three actuators and six edge sensors per segment to maintain the shape of the primary mirror. The actuators ...
  • Designing custom medium resolution observing modes to trace planet accretion with SCALES 
    Martinez, Raquel A; Sallum, Steph; Banyal, R. K; Batalha, Natalie; Batalha, Natasha; Blake, Geoff; Brandt, Tim; Briesemeister, Zack; Kleer, Katherine de; Pater, Imke de; Desai, Aditi; Eisner, Josh; Fong, Wen-fai; Greene, Tom; Honda, Mitsuhiko; Kain, Isabel; Kilpatrick, Charlie; Kupke, Renate; Lach, Mackenzie; Liu, Mike; Macintosh, Bruce; Mawet, Dimitri; Miles, Brittany; Morley, Caroline; Powell, Diana; Sheehan, Patrick; Skemer, Andrew J; Spilker, Justin; Stelter, Deno; Stone, Jordan; Surya, Arun; Sivarani, T; Wagner, Kevin; Zhou, Yifan (SPIE-The International Society for Optical Engineering, 2023-10)
    The Slicer Combined with Array of Lenslets for Exoplanet Spectroscopy (SCALES) is an under-construction thermal infrared high-contrast integral field spectrograph that will be located at the W. M. Keck Observatory. SCALES ...
  • Detached cold dust shell around the early R star (warm carbon star) HD 100764 
    Parthasarathy, M (The European Southern Observatory, 1991-07)
    The existence of a dust shell and warm dust near HD 100764 are determined from IRAS observations of early R stars, and the ramifications of the findings are discussed. The mass of the dust shell is calculated to be 0.510 ...
  • A detailed analysis of barium oxide molecular lines in sunspot umbral spectra 
    Shanmugapriya, G; Karthikeyan, B; Balachandrakumar, K; Rajamanickam, N; Bagare, S. P (Springer, 2015-06)
    It is essential to know the composition of atoms or molecules present in the astrophysical objects concerned to determine the physical and chemical nature of a solar or stellar region. With the aim to identify them clearly, ...
  • Detailed analysis of the variable star population in the globular cluster NGC 7006 
    Arellano Ferro, A; Rojas Galindo, F. C; Bustos Fierro, I. H; Muneer, S; Yepez, M. A; Giridhar, S (Oxford University Press on behalf of Royal Astronomical Society, 2023-02)
    A 5-yr CCD photometric VI time series of NGC 7006 is employed to perform a detailed analysis of the known population of variable stars. In the process, we have corrected inconsistent classifications, sky coordinates and ...
  • A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry 
    Arellano Ferro, A; Bramich, D. M; Jaimes, R. F; Giridhar, S; Kains, N; Kuppuswamy, K; Jorgensen, U. G; Alsubai, K. A; Andersen, J. M; Bozza, V; Browne, P; Novati, S. C; Damerdji, Y; Diehl, C; Dominik, M; Dreizler, S; Elyiv, A; Giannini, E; Harpsoe, K; Hessman, F. V; Hinse, T. C; Hundertmark, M; Juncher, D; Kerins, E; Korhonen, H; Liebig, C; Mancini, L; Mathiasen, M; Penny, M. T; Rabus, M; Rahvar, S; Ricci, D; Scarpetta, G; Skottfelt, J; Snodgrass, C; Southworth, J; Surdej, J; Tregloan-Reed, J; Vilela, C; Wertz, O (Oxford University Press on behalf of the Royal Astronomical Society, 2013-09-11)
    We report CCD V and I time series photometry of the globular cluster NGC 6333 (M9). The technique of difference image analysis has been used, which enables photometric precision better than 0.05 mag for stars brighter than ...
  • A detailed study of the geomagnetic storm of 8-10 March 1970 
    Balakrishnan, T. K; Varadarajan, R; Singh, S. B; Karunakaran, D; Aleem, P. S. M (National Institute of Science Communication And Information Resources, 1973-03)
    A comprehensive study of the geomagnetic oscillations during the storm of 8 – 10 March 1970 is made using data obtained from equatorial stations. The oscillation characteristics during the three main phases of the storm ...
  • Details of the expedition to Iradatganj during total solar eclipse of October 24, 1995 
    Bandyopadhyay, A; Pandey, P; Narayan, A; Biswas, C; Neogy, S (Indian Institute of Astrophysics, Bangalore, 1997)
    Equipment: Celestron C-14 Schmidt Cassegrain Telescope (14" diameter), off-axis 6" solar filter, ST6 CCD camera, Off-axis polaroid filter 6" rotatable in steps of 60 degree.
  • Detecting exomoons around self-luminous giant exoplanets through polarization 
    Sengupta, S; Marley, M. S (IOP Publishing, 2016-06-20)
    Many of the directly imaged self-luminous gas-giant exoplanets have been found to have cloudy atmospheres. Scattering of the emergent thermal radiation from these planets by the dust grains in their atmospheres should ...
  • Detecting Outliers in SDSS using Convolutional Neural Network 
    Sharma, K; Kembhavi, Ajit; Kembhavi, Aniruddha; Sivarani, T; Abraham, S. (Societe Royale des Sciences de Liege, 2019-10)
    We propose an automated algorithm based on Convolutional Neural Network (CNN) for the detection of peculiar objects in large databases using their spectral observations. A convolutional neural network is a class of ...
  • Detection of a branching-off feature from the Cygnus-Orion arm in the direction of Carina 
    Babu, G. S. D (Elsevier Science B.V., 1988)
    A program is presented for the study of faint young open clusters in the anticenter direction of the Galaxy with the aim of using these clusters as spiral arm tracers. Twelve open clusters are selected for observation. ...

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