IIA Institutional Repository: Recent submissions

  • Constraints of the Physics of Low-Mass AGB Stars from CH and CEMP Stars 
    Cristallo, S; Karinkuzhi, D; Goswami, A; Piersanti, L; Gobrecht, D (IOP Publishing, 2016-12-20)
    We analyze a set of published elemental abundances from a sample of CH stars which are based on high resolution spectral analysis of ELODIE and SUBARU/HDS spectra. All the elemental abundances were derived from local ...
  • H0 from ten well-measured time delay lenses 
    Rathna Kumar, S; Stalin, C. S; Prabhu, T. P (EDP Sciences, 2015-08)
    In this work, we present a homogeneous curve-shifting analysis using the difference-smoothing technique of the publicly available light curves of 24 gravitationally lensed quasars, for which time delays have been reported ...
  • Stara -Disk Interactions in Multiband Photometric Monitoring of the Classical T Tauri Star GI Tau 
    Guo, Zhen; Herczeg, Gregory J; Jose, J; Fu, Jianning; Chiang, Po-Shih; Grankin, Konstantin; Michel, R; Yadav, Ram Kesh; Liu, Jinzhong; Chen, Wen-Ping; Li, Gang; Xue, Huifang; Niu, Hubiao; Subramaniam, A; Sharma, Saurabh; Prasert, Nikom; Flores-Fajardo, Nahiely; Castro, Angel; Altamirano, Liliana (IOP Publishing, 2018-01)
    The variability of young stellar objects is mostly driven by star – disk interactions. In long-term photometric monitoring of the accreting T Tauri star GI Tau, we detect extinction events with typical depths ...
  • VLTI-AMBER velocity-resolved aperture-synthesis imaging of η· Carinae with a spectral resolution of 12 000 
    Weigelt, G; Hofmann, K. H; Schertl, D; Clementel, N; Corcoran, M. F; Damineli, A; De Wit, W. J; Grellmann, R; Groh, J; Guieu, S; Gull, T; Heininger, M; Hillier, D. J; Hummel, C. A; Kraus, S; Madura, T; Mehner, A; Merand, A; Millour, F; Moffat, A. F. J; Ohnaka, K; Patru, F; Petrov, R. G; Sridharan, R; Richardson, N. D; Rivinius, T; Scholler, M; Teodoro, M; Wittkowski, M (EDP Sciences, 2016-10)
    Context. The mass loss from massive stars is not understood well. η Carinae is a unique object for studying the massive stellar wind during the luminous blue variable phase. It is also an eccentric binary with a period of ...
  • 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 ...
  • Performance analysis of free space optical communication in open-atmospheric turbulence conditions with beam wandering compensation control 
    Anthonisamy, Arockia Bazil Raj; Durairaj, Padmavathi; Lancelot, J. P (IET, 2016-06-16)
    Among various atmospheric effects, beam wandering is the main cause for the major power loss in free space optical communication (FSOC) which cannot be resolved without incorporating the beam wandering compensation (BWC) ...
  • Age aspects of habitability 
    Safonova, M; Murthy, J; Shchekinov, Yu. A (Cambridge University Press, 2016-04)
    A ‘habitable zone’ of a star is defined as a range of orbits within which a rocky planet can support liquid water on its surface. The most intriguing question driving the search for habitable planets is whether they host ...
  • Taming the Electronic Structure of Diradicals through the Window of Computationally Cost Effective Multireference Perturbation Theory 
    Sinha Ray, Suvonil; Ghosh, A; Chattopadhyay, S; Chaudhuri, R. K (American Chemical Society, 2016-07-28)
    Recently a state-specific multireference perturbation theory (SSMRPT) with an improved virtual orbitals complete active space configuration interaction (IVO-CASCI) reference function has been proposed for treating electronic ...
  • Exploring the optical behaviour of a Type Iax supernova SN 2014dt 
    Singh, M; Misra, K; Sahu, D. K; Dastidar, R; Gangopadhyay, A; Bose, S; Srivastav, S; Anupama, G. C; Chakradhari, N. K; Brajesh Kumar; Kumar, B; Pandey, S. B (Oxford University Press on behalf of the Royal Astronomical Society, 2018-02)
    We present optical photometric (up to ∼ 410 d since B max ) and spectroscopic (up to ∼ 157 d since B max ) observations of a Type Iax supernova (SN) 2014dt located in M61. SN 2014dt is one of the brightest and ...
  • Characterization of X-ray flare properties of AB Dor 
    Lalitha, S (International Astronomical Union, 2015-08)
    The strong similarities between the flares observed on the Sun and in low mass stars has raised question regarding dynamo in these stars. Using the Sun as a prototype, one may be able to address this. In this paper, we ...
  • Relationships between fluid vorticity, kinetic helicity, and magnetic field on small-scales (quiet-network) on the sun 
    Sangeetha, C. R; Rajaguru, S. P (IOP Publishing, 2016-06-20)
    We derive horizontal fluid motions on the solar surface over large areas covering the quiet-Sun magnetic network from local correlation tracking of convective granules imaged in continuum intensity and Doppler velocity by ...
  • Ejecta curtain radiative transfer modeling for probing its geometry and dust optical properties 
    Shalima, P; Wada, K; Kimura, H (Elsevier, 2015-10)
    An ejecta curtain is produced as a result of impact cratering of celestial bodies that excavates and ejects their surface and underground material. Since ejecta particles are thought to reflect the interior materials and ...
  • Balloon UV experiments for astronomical and atmospheric observations 
    Sreejith, A. G; Mathew, J; Mayuresh, Sarpotdar; Nirmal, K; Ambily, S; Prakash, A; Safonova, M; Murthy, J (SPIE-The International Society for Optical Engineering, 2016-08)
    The ultraviolet (UV) window has been largely unexplored through balloons for astronomy. We discuss here the development of a compact near-UV spectrograph with fiber optics input for balloon flights. It is a modified ...
  • Topological and statistical properties of nonlinear force-free fields 
    Mangalam, A; Prasad, A (Elsevier B.V, 2018-01)
    We use our semi-analytic solution of the nonlinear force-free field equation to construct three-dimensional magnetic fields that areapplicable to the solar corona and study their statistical properties for estimating the ...
  • Developing scanning-slit spectrograph for imaging the Sun 
    Pruthvi, H; Ramesh, K. B; Dhara, Sajal Kumar; Ravindra, B (SPIE--The International Society for Optical Engineering, 2016-08)
    For moderate resolution spectroscopy of the Sun, an imaging spectrograph is being developed at Indian Institute of Astrophysics. With this instrument images of the region of interest of the Sun can be obtained with low ...
  • Simultaneous near-sun observations of a moving type IV radio burst and the associated white-light coronal mass ejection 
    Hariharan, K; Ramesh, R; Kathiravan, C; Wang, T. J (Springer, 2016-05)
    We present rare contemporaneous low-frequency (< 100 MHz) imaging, spectral, and polarimetric observations of a moving type IV radio burst that had close spatio-temporal association with a white-light coronal mass ejection ...
  • A generic FPGA-based detector readout and real-time image processing board 
    Mayuresh, Sarpotdar; Mathew, J; Safonova, M; Murthy, J (SPIE--The International Society for Optical Engineering, 2016-08)
    For space-based astronomical observations, it is important to have a mechanism to capture the digital output from the standard detector for further on-board analysis and storage. We have developed a generic (application- ...
  • Long-term study of Mkn 421 with the HAGAR array of telescopes 
    Sinha, A; Shukla, A; Saha, L; Acharya, B. S; Anupama, G. C; Bhattacharjee, P; Britto, R. J; Chitnis, V. R; Prabhu, T. P; Singh, B. B; Vishwanath, P. R (EDP Sciences, 2016-07)
    Context. The HAGAR Telescope Array at Hanle, Ladakh has been regularly monitoring the nearby blazar Mkn 421 for the past seven years. Aims. Blazars show flux variability in all timescales across the electromagnetic ...
  • Accuracy measurement for image retrieval system 
    Thabasu Kannan, S; Kumaravel, P (Vandana Publications, 2015-08)
    During the past decades we have been observing a permanent increase in image data, leading to huge repositories. Content-based image retrieval (CBIR) methods have tried to improve the access to image data. To date, numerous ...
  • Small scale clustering of late forming dark matter 
    Agarwal, S; Corasaniti, P.-S; Das, Subinoy; Rasera, Y (The American Physical Society, 2015-09-15)
    We perform a study of the nonlinear clustering of matter in the late-forming dark matter (LFDM) scenario in which dark matter results from the transition of a nonminimally coupled scalar field from radiation to collisionless ...

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