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  • Forward-scattering Hanle effect in the solar Ca i 4227 Å line 
    Frisch, H; Anusha, L. S; Bianda, M; Holzreuter, R; Nagendra, K. N; Ramelli, R; Sampoorna, M; Smitha, H. N; Stenflo, J. O (Cambridge University Press, 2012-06)
    High sensitivity spectropolarimetric observations of the four Stokes parameters of the solar Ca i 4227 Å line have been performed in October 2010 at IRSOL with the ZIMPOL polarimeter, near the disk center, outside an active ...
  • Fossil magnetic fields of the sun and stars 
    Hiremath, K. M; Gokhale, M. H (Astronomical Society of India, 2000)
    Using helioseismologically inferred internal rotation given by Dziembowski et al., 1989, in the previous work, we (Hiremath and Gokhale 1995, Hiremath 1995) modelled the steady (fossil) part of the poloidal magnetic field ...
  • Four hundredth anniversary of Kepler’s supernova 
    Vishwanath, P. R (Indian Academy of Sciences, 2004-10)
  • Four years of starspot evolution on an active F-type ultra-fast rotator KIC 6791060 
    Karmakar, Subhajeet; Pandey, J. C; Savanov, Igor S; Raj, A; Dmitrienko, E. S; Pakhomov, Yurij; Sahu, D. K (Cambridge University Press, 2018-02)
    Using the data obtained from Kepler satellite, we have analyzed an F-type ultra-fast rotator KIC 6791060. We derive a rotational period of 0.34365±0.00004 d. Multiple periodicity with a period separation of ∼0.00016 d was ...
  • Four-component relativistic state-specific multireference perturbation theory with a simplified treatment of static correlation 
    Ghosh, A; Sinha Ray, Suvonil; Chaudhuri, R. K; Chattopadhyay, Sudip (American Chemical Society, 2017-02-23)
    The relativistic multireference (MR) perturbative approach is one of the most successful tools for the description of computationally demanding molecular systems of heavy elements. We present here the ground state dissociation ...
  • Four-component relativistic state-specific multireference perturbation theory with a simplified treatment of static correlation 
    Ghosh, A; Sinha Ray, Suvonil; Chaudhuri, R. K; Chattopadhyay, Sudip (American Chemical Society, 2017-02-23)
    The relativistic multireference (MR) perturbative approach is one of the most successful tools for the description of computationally demanding molecular systems of heavy elements. We present here the ground state dissociation ...
  • Fourier smoothing of digital photographic spectra 
    Anupama, G. C (Astronomical Society of India, 1990-03)
    Fourier methods of smoothing one-dimensional data are discussed with particular reference to digital photographic spectra. Data smoothed using lowpass filters with different cut-off frequencies are intercompared. A method ...
  • FPGA Based ASM implementation for CCD Camera Controller 
    Srinivasan, R; Anupama, K; Suneeta; Saha, S. K; Rao, A (MacMillan Publishers Ind. Ltd, 2009)
    A general purpose CCD controller that can address any CCD, has been developed at the Indian Institute of Astrophysics. It is based on a Digital Signal Processor (DSP) chip, Motorola DSP 56002 for implementing essential ...
  • FPGA based Digital Backend System for Low Frequency Radio Observations 
    Sarpotdar, Mayuresh N (Indian Institute of Astrophysics, 2013-08)
    Radio Astronomy involves digital systems for processing and analyzing the celestial radio signals received by the radio antennas. In recent days, Field Programmable Gate Arrays (FPGAs) are used for digital signal processing ...
  • FR Cnc - A Young Spotted Star 
    Pandey, J. C (Astronomical Society of India, 2003)
    Optical photometric and spectroscopic studies of the star FR Cnc = BD + 16 1753 have been carried out during the years 2001 - 2002. The star is photometrically variable with a mean period of 0d.8271 ± 0.0002. The rapid ...
  • FR Cnc revisited: photometry, polarimetry and spectroscopy 
    Golovin, A; Galvez-Ortiz, M. C; Hernan-Obispo, M; Andreev, M; Barnes, J. R; Montes, D; Pavlenko, E; Pandey, J. C; Martinez-Arnaiz, R; Medhi, B. J; Parihar, P. S; Henden, A; Sergeev, A; Zaitsev, S. V; Karpov, N (Wiley-Blackwell, 2012-03)
    This paper is part of a multiwavelength study aimed at using complementary photometric, polarimetric and spectroscopic data to achieve an understanding of the activity process in late-type stars. Here, we present the ...
  • Fractal analysis of galaxy surveys 
    Seshadri, T. R (Astronomical Society of India, 2005-03)
    Fractal analysis is a powerful tool to study the nature of galaxy distribution. The use of multifractal analysis of the galaxy distribution for the investigation of the transition to homogeneity in the Universe is reviewed. ...
  • Fractal structure of solar supergranulation 
    Paniveni, U; Krishan, V; Singh, J; Srikanth, R (European Space Agency, 2005-12)
    We employ fractal analysis to study the complexity of supergranulation structure using the solar and Heliospheric Observatory (SOHO) dopplergrams. Our data consist of 200 visually selected Supergranular cells, for which ...
  • Fraction of broad absorption line quasars in different radio morphologies 
    Nair, A; Vivek, M (Oxford University Press on behalf of Royal Astronomical Society, 2022-04)
    In this study, we investigated the orientation model of Broad Absorption Line (BAL) quasars using a sample of sources that are common in Sloan Digital Sky Survey (SDSS) Data Release (DR)-16 quasar catalogue and Very Large ...
  • Franck-Condon factors and /r-centroids for a number of band systems of the astrophysical molecule AlF 
    Kumar, K. B; Rajamanickam, N; Bagare, S. P; Gomez, F. M; Gonzalez, L. J. J. (Elsevier, 2003-10)
    Franck-Condon factors and /r-centroids, which are very closely related to transition probabilities, have been evaluated by the more reliable numerical integration procedure for the bands of B1Σ+-X1Σ+, C1Σ+-X1Σ+, c3Σ+-b3Σ+, ...
  • Franck-Condon factors and r-centroids for certain band systems of astrophysical molecules SrF and ScF 
    Ramachandran, P. S; Rajamanickam, N; Bagare, S. P; Kumar, B. C (Springer, 2005-01)
    The Franck-Condon factors and r-centroids, which are very closely related to vibrational transition probabilities, have been evaluated by the more reliable numerical integration procedure for the bands of B 2∑+ X 2∑+, F ...
  • Franck-Condon factors and r-centroids for the B, C, D - X and d-b band systems of astrophysical molecule BF 
    Raja, V; Rajamanickam, N (Astronomical Society of India, 2001)
    The Franck-Condon factors and r-centroids, which are very closely related to transition probabilities, have been evaluated by the reliable numerical integration procedure for the bands of B1?+ - X1?+, C1?+ - X1?+ D1?-X1?+ ...
  • Franck-Condon factors for some abundant umbral molecules 
    Joshi, G. C; Joshi, U. C; Punetha, L. M; Pande, M. C (Astronomical Society of India, 1982-06)
    Some of the molecular transitions in UV in sunspots are pointed out and Franck-Condon factors for some of these have been calculated.
  • French astronomers in India during the 17th - 19th centuries 
    Kochhar, R. K (British Astronomical Society, 1991-04)
    The contributions made by French astronomers from India are reviewed. The French were more successful on the scientific front than on the colonial. The first telescopic discovery from India was made by a French Jesuit ...
  • Frenet-Serret description of gyroscopic precession 
    Iyer, B. R; Vishveshwara, C. V (The American Physical Society, 1993)
    The phenomenon of gyroscopic precession is studied within the framework of the Frenet-Serret formalism adapted to quasi-Killing trajectories. Its relation to the congruence vorticity is highlighted with particular reference ...

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