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Browsing by Subject "Techniques: Spectroscopic"

Browsing by Subject "Techniques: Spectroscopic"

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  • Do the Line Widths of Coronal Emission Lines Increase with Height above the Limb? 
    Singh, J; Sakurai, T; Ichimoto, K (University of Chicago Press, 2006-03)
    In our earlier studies we obtained off-the-limb spectroscopic observations in a number of forbidden emission lines ([Fe X–XIV]) to study the physical properties and their temporal variations in steady coronal structures. ...
  • 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 (Royal Astronomical Society, 2003-04)
    We present the UBVRcIc broad-band optical photometry of the Type Ic supernova SN 2002ap obtained during 2002 February 6-March 23 in the early decline phases and also later on 2002 August 15. Combining these data with the ...
  • Jets in polar coronal holes 
    Scullion, E; Popescu, M. D; Banerjee, D; Doyle, J. G; Erdelyi, R (IOP Publishing, 2009-10-20)
    Here, we explore the nature of small-scale jet-like structures and their possible relation to explosive events and other known transient features, like spicules and macrospicules, using high-resolution spectroscopy obtained ...
  • An Optical, Dual-Beam, Automated Medium Resolution Spectropolarimeter for the Vainu Bappu Telescope 
    Chakraborty, P; Vasundhara, R (Springer, 2003-03)
    Fabrication of an optical dual-beam spectropolarimeter as an add-on facility to an existing astronomical spectrograph at the Vainu Bappu Telescope is described. The polarimetric optics consists of a superachromatic ...
  • A search for unrecognized carbon-enhanced metal-poor stars in the galaxy 
    Placco, V. M; Kennedy, C. R; Rossi, S; Beers, T. C; Lee, Y. S; Christlieb, N; Sivarani, T; Reimers, D; Wisotzki, L (Institute of Physics, 2010-03)
    We have developed a new procedure to search for carbon-enhanced metal-poor (CEMP) stars from the Hamburg/ESO (HES) prism-survey plates. This method employs an extended line index for the CH G band, which we demonstrate to ...
  • Spectroscopic Studies of the Solar Corona II. Properties of Green and Red Emission Lines in Open and Closed Coronal Structures 
    Singh, J; Sakurai, T; Ichimoto, Kiyoshi; Suematsu, Yoshinori; Takeda, Aki (Astronomical Society of Japan, 2002-10)
    We obtained profiles of the green (Fe <FONT SIZE="-2">XIV 5303Å) and red (Fe <FONT SIZE="-2">X 6374Å) emission lines simultaneously on 1998 July18-19 for about 4hours with a cadence of 10minutes, covering an area of about ...
  • Spectroscopic Studies of the Solar Corona III. Density Diagnostics Using the Infrared Lines of Fe XIII 
    Singh, J; Sakurai, Takashi; Ichimoto, K; Takeda, Aki (Astronomical Society of Japan, 2002)
    We have obtained spectrographic observations of several coronal regions in three emission lines (6374Å [Fe X ], 10747Å [Fe XIII ], and 10798Å [Fe XIII ]) simultaneously. The 25-cm coronagraph at Norikura Observatory and ...
  • Spectroscopic Studies of the Solar Corona. IV. Physical Properties of Coronal Structure 
    Singh, J; Ichimoto, K; Sakurai, T; Muneer, S (The American Astronomical Society, 2003-03)
    We obtained spectrographic observations of several coronal structures at the limb overlying the sunspot regions, simultaneously in the Fe XIV (5303 Å) and Fe X (6374 Å) emission lines on several days, and simultaneously ...

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