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  • Fading and variations in the spectrum of the central star of the young Planetary Nebula SAO 244567 (Hen 1357) 
    Parthasarathy, M; Garcia-Lario, P; de Martino, D; Pottasch, S. R; de Cordoba, S. F (International Astronomical Union, 1997)
  • Fading of light maximum and linear polarization variation in the carbon Mira R Leporis 
    Raveendran, A. V (Royal Astronomical Society, 2002-11)
    Polarimetry of R Lep obtained over the years 1991-2002 is presented. During this period the star underwent an episode of fading of the brightness at light maximum, after an interval of about 35 yr. An analysis of the data ...
  • Faint BVRI Photometric Sequences in Selected Fields 
    Saha, A; Dolphin, A. E; Thim, F; Whitmore, B (The Astronomical Society of the Pacific, 2005-01)
    The results from work done to extend the Johnson-Cousins BVRI photometric standard sequence to faint levels of V~21 mag in compact fields is presented. Such calibration and extension of sequences is necessary to fill a ...
  • A family of triaxial mass models : Analytical study of its projected properties 
    Das, M; Chakraborty, D. K (Astronomical Society of India, 2001)
    Triaxial modified Hubble mass models are studied. The models are more general than those studied by earlier workers. The potential and the projected surface density of the mass models can be calculated analytically. The ...
  • Far infrared mapping of three galactic star forming regions 
    Ghosh, S. K; Mookerjea, B; Rengarajan, T. N; Tandon, S. N; Verma, R. P (Astronomical Society of India, 2001)
    Three Galactic star forming regions in the northern sky, viz., associated with W3(OH), S209 and S187 have been simultaneously mapped in two trans-IRAS far infrared (FIR) bands centered at ~ 140 and 200 μm using the TIFR ...
  • The far-infrared (IRAS) excess in BQ() and related stars 
    Parthasarathy, M; Pottasch, S. R (European Southern Observatory, 1989-11)
    The FIR IRAS flux distributions and color of 12 peculiar emission-line objects (HD 51585, Hen 401, Hen 591, Hen 1013, He 2-138, M 2-9, HD 326971, Hen 1357, Hen 1428, Tc 1, Hen 1475, and M 1-26) are found to be similar to ...
  • The far-infrared (IRAS) excess in HD 161796 and related stars 
    Parthasarathy, M; Pottasch, S. R (European Southern Observatory, 1986-01)
    The far infrared IRAS measurements of the high galactic latitude F-supergiant HD 161796 and related stars are found to show strong far infrared excesses, due to large amounts of dust around them. For HD 161796 the dust ...
  • The far-infrared (IRAS) excess in luminous F-G stars 
    Pottasch, S. R; Parthasarathy, M (European Southern Observatory, 1988-03)
    The far-infrared IRAS excesses are found in ten luminous F-G stars. The far-IR fluxes from these stars are due to large amounts of dust around them. The far-IR flux distribution, far-IR luminosities and dust masses are ...
  • Far-infrared and radio continuum properties of spiral galaxies in clusters 
    Rengarajan, T. N; Karnik, A. D; Iyengar, K. V. K (The Royal Astronomical Society, 1997-09)
    Data on the far-infrared (FIR) and radio continuum properties of spiral galaxies in several clusters have been collected from the literature. To assess the effect of the cluster environment on the FIR and radio continuum ...
  • Far-infrared observations of three compact IRAS sources in Sh 247 star forming complex: IRAS 06056+2131, 06058+2138 and 06061+2151 
    Ghosh, S. K; Iyengar, K. V. K; Karnik, A. D; Rengarajan, T. N (Astronomical Society of India, 2000)
    Three compact IRAS sources -- IRAS 06056+2131, 06058+2138 and 06061+2151 in the Sh 247 complex and having IRAS colours typical of compact H II regions have been observed in the far-infrared using the TIFR 1 m balloon-borne ...
  • Far-infrared study of a few southern Galactic star forming regions 
    Ojha, D. K; Ghosh, S. K; Verma, R. P (Astronomical Society of India, 2002-09)
    Simultaneous far-infrared observations at 130 and 200 pm of the southern Galactic star forming regions (associated with mAS 12326-6245, IRAS 17059-4132, !RAS 17160-3707 & IRAS 17233-3606) have been carried out using the ...
  • Far-infrared study of K giants in the solar neighborhood: connection between Li enrichment and mass-loss 
    Bharat Kumar, Y; Reddy, B. E; Muthumariappan, C; Zhao, G (EDP Sciences, 2015-05)
    Context. A small group of red giant branch (RGB) stars are known to have anomalous Li enhancement whose origin is still not well understood. Some studies have proposed that the Li enhancement in RGB stars is correlated to ...
  • Far-ultraviolet Diffuse Emission from the Large Magellanic Cloud 
    Pradhan, A. C; Pathak, A; Murthy, J (IOP Publishing, 2010-08)
    We present the first observations of diffuse radiation in the far-ultraviolet (FUV; 1000-1150 Å) from the Large Magellanic Cloud based on observations made with the Far Ultraviolet Spectroscopic Explorer. The fraction of ...
  • Far-ultraviolet scattering by dust in Orion 
    Shalima, P; Sujatha, N. V; Murthy, J; Henry, R. C; Sahnow, D. J (Blackwell Publishing, 2006-04)
    We have modelled diffuse far-ultraviolet (FUV) spectrum observed by the Far Ultraviolet Spectroscopic Explorer (FUSE) near M42 as the scattering of the starlight from the Trapezium stars by dust in front of the nebula. The ...
  • Far-ultraviolet to Near-infrared Observations of SN 2023ixf: A High-energy Explosion Engulfed in Complex Circumstellar Material 
    Teja, Rishabh Singh; Singh, Avinash; Basu, Judhajeet; Anupama, G. C; Sahu, D. K; Dutta, Anirban; Swain, Vishwajeet; Nakaoka, Tatsuya; Pathak, Utkarsh; Bhalerao, Varun; Barway, Sudhanshu; Kumar, Harsh; Nayana, A. J; Imazawa, Ryo; Kumar, Brajesh; Kawabata, Koji S (American Astronomical Society, 2023-09-01)
    We present early-phase panchromatic photometric and spectroscopic coverage spanning the far-ultraviolet to near-infrared regime of the nearest hydrogen-rich core-collapse supernova (SN) in the last 25 yr, SN 2023ixf. We ...
  • Faraday rotation signatures of fluctuation dynamos in young galaxies 
    Sur, Sharanya; Pallavi Bhat; Subramanian, K (Oxford University Press on behalf of the Royal Astronomical Society, 2018-03)
    Observations of Faraday rotation through high-redshift galaxies have revealed that they host coherent magnetic fields that are of comparable strengths to those observed in nearby galaxies. These fields could be generated ...
  • Faraday rotation versus stimulated Raman scattering in intense sources 
    Gangadhara, R. T; Krishan, V (Astronomical Society of India, 1993)
    A coherent plasma process such as the stimulated Raman scattering plays significant role in bringing about the changes in polarization characteristics of radiation. It is found that some of the observed polarization ...
  • Fast electron generation in quasiperpendicular shocks and type II solar radiobursts 
    Krasnoselskikh, V. V; Kruchina, E. N; Volokitin, A. S; Thejappa, G (European Southern Observatory, 1985-08)
    The paper is devoted to the theory of type II solar radio bursts caused by collisionless shock waves propagating in the coronal plasma. The model developed is based on the theory of collisionless shock waves, which predicts ...
  • Fast Iterative Techniques for Polarized Radiative Transfer in Spherically Symmetric Moving Media 
    Megha, A; Sampoorna, M; Nagendra, K. N; Anusha, L. S; Sankarasubramanian, K (IOP Publishing, 2020-11-01)
    For a more precise modeling of polarized spectral lines formed in extended and expanding stellar atmospheres, the solution of the radiative transfer equation for the Stokes vectors must be obtained in a spherical geometry ...
  • Fast Numerical Methods for Polarized Line Radiative Transfer in the Presence of Hanle Effect 
    Faurobert, M; Frisch, H; Nagendra, K. N (Astronomical Society of the Pacific, 1999-09)
    The Hanle effect provides a diagnostic tool for weak magnetic fields which do not give rise to a measurable Zeeman effect, such as turbulent fields or magnetic canopies. The lines which are sensitive to the Hanle effect ...

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