IIAP Publications: Recent submissions

  • Dynamic Loading Assembly for Testing Actuators of Segmented Mirror Telescope 
    Prasanna Deshmukh; Parihar, P. S; Balasubramaniam, K. A; Mishra, Deepta Sundar; Mahesh, P. K (World Scientific Publishing Co., 2017-09)
    Upcoming large telescopes are based on Segmented Mirror Telescope (SMT) technology which uses small hexagonal mirror segments placed side by side to form the large monolithic surface. The segments alignment needs to be ...
  • Period changes in the RR Lyrae stars of NGC 6171 (M107) 
    Arellano Ferro, A; Rosenzweig, P; Luna, A; Deras, D; Muneer, S; Giridhar, S; Michel, R (WILEY-VCH Verlag GmbH & Co., 2018-02)
    Based on photometric data obtained between 1935 and 2017, O −C diagrams were built for 22 RR Lyrae stars in the globular cluster NGC 6171, leading to the discovery of secular period changes in four variables for which we ...
  • Dark energy constraints on masses and sizes of large scale cosmic structures 
    Rebecca, L; Arun, K; Sivaram, C (Springer, 2018-07)
    The requirement that their gravitational binding self-energy density must at least equal the background repulsive dark energy density for large scale cosmic structures implies a mass-radius relation of M/R2 ≈ 1 g/cm2, as ...
  • A peculiar multiwavelength flare in the blazar 3C 454.3 
    Gupta, A. C; Mangalam, A; Wiita, J. Paul; Kushwaha, P; Gaur, H; Zhang, H; Gu, M. F; Liao, M; Dewangan, G. C; Ho, L. C; Mohan, P; Umeura, M; Sasada, M; Volvach, A. E; Agarwal, A; Aller, M. F; Aller, H. D; Bachev, R; Lahteenmaki, A; Semkov, E; Strigachev, A; Tornikoski, M; Volvach, L. N (Oxford University Press on behalf of the Royal Astronomical Society, 2017-11)
    The blazar 3C 454.3 exhibited a strong flare seen in γ -rays, X-rays and optical/near-infrared bands during 2009 December 3–12. Emission in the V and J bands rose more gradually than did the γ -rays and soft X-rays, ...
  • Variations in Ca-K line profiles and Ca-K line features as a function of latitude and solar cycle during the 20th century 
    Singh, J; Priyal, M; Sindhuja, G; Ravindra, B (Cambridge University Press, 2018-02)
    The analysis of the Ca-K line spectra as a function of latitude and integrated over the visible disk obtained during the period of 1989–2011 at the Kodaikanal Solar Tower Telescope shows that the FWHM of the K1 distribution ...
  • Flux tube model in the solar atmosphere 
    Sen, Samrat; Mangalam, A (Cambridge University Press, 2018-02)
    We construct two classes of the magnetohydrostatic equilibria of the axisymmetric flux tubes with twisted magnetic fields in the stratified solar atmosphere that span from the photosphere to the transition region. We built ...
  • Unusual long-term low-activity states of EGRET blazars in the Fermi era 
    Bhattacharya, Debbijoy; Mohana A, K; Gulati, S; Bhattacharyya, Subir; Bhatt, N; Sreekumar, P; Stalin, C. S (Oxford University Press on behalf of the Royal Astronomical Society, 2017-11)
    We examine the long-term (∼10 years) γ-ray variability of blazars observed by the Energetic Gamma Ray Experiment Telescope (EGRET) and Fermi and find that 10 EGRET-detected flat-spectrum radio quasars (FSRQs) were not ...
  • Energy distribution of solar flare events 
    Sen, Samrat; Mangalam, A; Ramesh, R (Cambridge University Press, 2018-02)
    The coronal field typically reorganizes itself to attain a force-free field configuration. We have evaluated the power law index of the energy distribution f(E) = f0E−α by using a model of relaxation incorporating ...
  • Investigating the in-flight performance of the UVIT payload on AstroSat 
    Rahna, P. T; Murthy, J; Safonova, M; Sutaria, F. K; Gudennavar, S. B; Bubbly, S. G (Oxford University Press on behalf of the Royal Astronomical Society, 2017-11)
    We have studied the performance of the Ultraviolet Imaging Telescope payload on AstroSat and derived a calibration of the far-ultraviolet (FUV) and near-ultraviolet (NUV) instruments on board. We find that the sensitivity ...
  • Unusual bright filaments on the sun on 1926 February 22 
    Royds, T (Royal Astronomical Society, 1926)
  • Search for variable stars in the open cluster NGC 2509 
    Dar, A. A; Parihar, P. S; Saleh, P; Malik, M. A (Elsevier B.V, 2018-10)
    This work presents the first photometric variability survey of the open cluster NGC 2509 carried out in February, 2017. Data of four nights was analysed by ensemble photometry technique, using 1k × 1k CCD and 1.3 m telescope ...
  • Why are classical bulges more common in S0 galaxies than in spiral galaxies? 
    Mishra, P. K; Wadadekar, Y; Barway, Sudhanshu (Oxford University Press on behalf of the Royal Astronomical Society, 2018-07)
    In this paper, we try to understand why the classical bulge fraction observed in S0 galaxies is significantly higher than that in spiral galaxies. We carry out a comparative study of the bulge and global properties of a ...
  • UVIT view of ram-pressure stripping in action: Star formation in the stripped gas of the GASP jellyfish galaxy JO201 in Abell 85 
    George, K; Poggianti, B. M; Gullieuszik, M; Fasano, G; Bellhouse, C; Postma, J; Moretti, A; Jaffe, Y; Vulcani, B; Bettoni, D; Fritz, J; Cote, P; Ghosh, S. K; Hutchings, J. B; Mohan, Rekhesh; Sreekumar, P; Stalin, C. S; Subramaniam, A; Tandon, S. N (Oxford University Press on behalf of the Royal Astronomical Society, 2018-09)
    Jellyfish are cluster galaxies that experience strong ram-pressure effects that strip their gas. Their Hα images reveal ionized gas tails up to 100 kpc, which could be hosting ongoing star formation. Here, we report the ...
  • Atmospheric mass-loss of extrasolar planets orbiting magnetically active host stars 
    Lalitha, S; Schmitt, J. H. M. M; Dash, S (Oxford University Press on behalf of the Royal Astronomical Society, 2018-06)
    Magnetic stellar activity of exoplanet hosts can lead to the production of large amounts of high-energy emission, which irradiates extrasolar planets, located in the immediate vicinity of such stars. This radiation is ...
  • Magnetic fields in multiple bright-rimmed clouds in different directions of H II region IC 1396 
    Soam, A; Maheswar, G; Lee, C. W; Neha, S; Kim, K (Oxford University Press on behalf of the Royal Astronomical Society, 2018-06)
    Bright-rimmed clouds (BRCs) form on the edges of H II regions affected by high-energy radiation from a central ionizing source. The UV radiation from the ionizing source results in compression and ionization, causing either ...
  • Polarization of seven MBM clouds at high Galactic latitude 
    Neha, S; Maheswar, G; Soam, A; Lee, C. W (Oxford University Press on behalf of the Royal Astronomical Society, 2018-06)
    We made R-band polarization measurements of 234 stars towards the direction of the MBM 33–39 cloud complex. The distance of the MBM 33–39 complex was determined as 120 ± 10 pc using polarization results and near-infrared ...
  • Chemical Composition of Two Bright, Extremely Metal-poor Stars from the SDSS MARVELS Pre-survey 
    Bandyopadhyay, A; Sivarani, T; Susmitha, A; Beers, T. C; Giridhar, S; Arun Surya; Masseron, T (IOP Publishing, 2018-06-01)
    SDSS J082625.70+612515.10 (V = 11.4; [Fe/H] = −3.1) and SDSS J134144.60+474128.90 (V = 12.4; [Fe/H] = −3.2) were observed with the SDSS 2.5m telescope as part of the SDSS MARVELS spectroscopic pre-survey and identified ...
  • Temporal and Latitudinal Variations of the Length-Scales and Relative Intensities of the Chromospheric Network 
    Raju, K. P (Oxford University Press on behalf of the Royal Astronomical Society, 2018-08)
    The Calcium K spectroheliograms of the Sun from Kodaikanal have a data span of about 100 yr and covers over nine solar cycles. The Ca line is a strong chromospheric line dominated by chromospheric network and plages which ...
  • The strange case of SN 2011ja and its host 
    Chakraborti, S; Ray, A; Smith, R; Ryder, S; Yadav, N; Sutaria, F. K; Dwarkadas, V. V; Chandra, P; Pooley, D; Roy, R (Cambridge University Press, 2014-01)
    SN 2001ja was observed twice in three months using the Chandra X-Ray Observatory. The X-ray flux could be due to interaction with the circumstellar medium, perhaps dominated by the reverse shock heated thermal plasma, or ...
  • Two New Super Li-rich Core He-burning Giants: A New Twist to the Long Tale of Li Enhancement in K Giants 
    Bharat Kumar, Y; Singh, R; Reddy, B. E; Zhao, G (IOP Publishing, 2018-05-10)
    In this Letter we report two new super Li-rich K giants, KIC2305930 and KIC12645107, with Li abundances exceeding that of the interstellar medium (ISM; A(Li) ≥ 3.2 dex). Importantly, both of the giants have been classified ...

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