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Browsing IIAP Publications by Title

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  • A Flattening in the Optical Light Curve of SN 2002ap. 
    Pandey, S. B; Anupama, G. C; Sagar, R; Bhattacharya, D; Sahu, D. K; Pandey, J. C (Blackwell Publishing, Edinburge, UK, 1994)
  • 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 ...
  • Flow of Gas along a Magnetic field with Time-Dependent Geometry 
    Hasan, S. S; Venkatakrishnan, P (Indian Institute of Astrophysics, Bangalore, 1980)
    The flow of gas along a magnetic field with time dependent geometry has been studied. It is seen that the velocity of the flow in the direction of the magnetic field depends both on the magnitude of the velocity of flow ...
  • Flows and waves in braided solar coronal magnetic structures 
    Pant, V; Datta, A; Banerjee, D (IOP Publishing, 2015-03-01)
    We study the high frequency dynamics in the braided magnetic structure of an active region (AR 11520) moss as observed by the High-Resolution Coronal Imager (Hi-C). We detect quasi-periodic flows and waves in these structures. ...
  • Fluorine detection in hot extreme helium stars 
    Bhowmick, A; Pandey, G; Lambert, D. L (Springer, 2020-12)
    The origin and evolution of hydrogen-deficient stars are not yet adequately understood. Their chemical peculiarities, along with hydrogen-deficiency, makes them stand out from the rest and sheds light on their possible ...
  • Fluorine in R Coronae Borealis Stars 
    Pandey, G; Lambert, D. L; Kameswara Rao, N (Astronomical Society of the Pacific, 2008)
    Neutral fluorine lines are identified in the optical spectra of several R Coronae Borealis stars (RCBs) at maximum light. These lines provide the first measurement of the fluorine abundance in these stars. Fluorine is ...
  • Fluorine in R Coronae Borealis Stars 
    Pandey, G; Lambert, D. L; Kameswara Rao, N (University of Chicago Press, 2008-02)
    Neutral fluorine (F i) lines are identified in the optical spectra of several R Coronae Borealis stars (RCBs) at maximum light. These lines provide the first measurement of the fluorine abundance in these stars. Fluorine ...
  • Flux and polarization variability of OJ 287 during the early 2016 outburst 
    Rakshit, S; Stalin, C. S; Muneer, S; Neha, S; Paliya, Vaidehi S (IOP Publishing, 2017-02-01)
    The gamma-ray blazar OJ 287 was in a high activity state during 2015 December–2016 February. Coinciding with this high brightness state, we observed this source for photometry on 40 nights in R-band and for polarimetry on ...
  • Flux and spectral variability of Mrk 421 during its moderate activity state using NuSTAR: Possible accretion disc contribution? 
    Mondal, S; Priyanka Rani; Stalin, C. S; Chakrabarti, S. K; Rakshit, S (EDP Sciences, 2022-07)
    Context. The X-ray emission in BL Lac objects is believed to be dominated by synchrotron emission from their relativistic jets. However, when the jet emission is not strong, one could expect signatures of X-ray emission ...
  • Flux emergence in the solar active region NOAA 11158: the evolution of net current 
    Vemareddy, P; Venkatakrishnan, P; Karthikreddy, S (IOP Publishing, 2015-09)
    We present a detailed investigation of the evolution of observed net vertical current using a time series of vector magnetograms of the active region (AR) NOAA 11158 obtained from the Helioseismic and Magnetic Imager. We ...
  • 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 ...
  • Fluxvector Splitting of the Inviscid Radiation Gas Dynamic Equations 
    Peraiah, A (Indian Institute of Astrophysics, Bangalore, 1980)
    We have analysed various schemes for the iterative simultaneous solution of the inviscid gas dynamic equations. We have considered the problem from the point of view of the stellar atmospheres. The difference between ...
  • A Fock space coupled cluster based probing of the single- and double-ionization profiles for the poly-cyclic aromatic hydrocarbons and conjugated polyenes 
    Chaudhuri, R. K; Chattopadhyay, Sudip (American institute of Physics, 2021-03-21)
    Sequential formation of a poly-cyclic aromatic hydrocarbon (PAH) dication in the H I regions of the interstellar medium (ISM) is proposed to be a function of internal energy of the doubly ionized PAHs, which, in turn, is ...
  • Fock-space multireference coupled cluster calculations of Auger energies of noble gas elements using relativistic spinors 
    Chaudhuri, R. K; Chattopadhyay, S (American Institute of Physics, 2019-08)
    We report the Auger and Coster-Kronig transition energies (related to double ionization potentials) of noble gas elements obtained using the Fock-space multireference coupled cluster (FSMRCC) method with relativistic ...
  • Fock-space multireference coupled-cluster calculations of the hyperfine structure of isoelectronic 33S− and 35,37Cl 
    Madhulita Das; Chaudhuri, R. K; Chattopadhyay, Sudip; Mahapatra, Uttam Sinha (American Physical Society, 2011-10)
    Due to its flexibility and possible systematic improvement, the Fock-space (FS) multireference coupled-cluster (MRCC) method remains a very important tool for the computation of energy differences of spectroscopic interest. ...
  • Forenoon bite-out in f0F2 at low latitudes 
    Sastri, J. H; Ramesh, K. B (The Council of Scientific and Industrial Research, 1982-04)
    Evidence is presented showing that the longitudinal extent of the forenoon bite-out in f0F2 at low geomagnetic latitudes can sometimes be very narrow and that marked differences in the extent of the development of the ...
  • Formation and Abundance of Late-forming Primordial Black Holes as Dark Matter 
    Chakraborty, Amlan; Chanda, Prolay K; Pandey, Kanhaiya L; Das, Subinoy (American Astronomical Society, 2022-06-20)
    We propose a novel mechanism where primordial black hole (PBH) dark matter is formed much later in the history of the universe, between the epochs of Big Bang nucleosynthesis and cosmic microwave background photon decoupling. ...
  • Formation and eruption of sigmoidal satructure from a weak field region of NOAA 11942 
    Vasantharaju, N; Vemareddy, P; Ravindra, B; Doddamani, V. H (IOP Publishing, 2019-04-01)
    Using observations from the Solar Dynamics Observatory, we studied an interesting example of a sigmoid formation and eruption from small-scale flux-canceling regions of active region (AR) 11942. Through an analysis of ...
  • Formation and Observations of Shadow Bands During the Total Solar Eclipse of November 23, 2003 Near Maitri, Antarctic 
    Vats, Hari Om; Bagare, S. P; Bhandari, S. M (World Scientific Publishing Co., 2006)
    The phenomenon of shadow bands takes place due to the scattering of sunlight by the irregularities in the local atmosphere. Observation of shadow bands were made just before and after the total solar eclipse (TSE) on ...
  • Formation of a proto-quasar from accretion flows in a halo 
    Mangalam, A (E D P Sciences, 2001-12)
    We present a detailed model for the formation of massive objects at the centers of galaxies. The effects of supernovae heating and the conditions of gas loss are revisited. The escape time of the gas is compared with the ...

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