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Browsing by Author "Raveendran, A. V"

Browsing by Author "Raveendran, A. V"

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  • Short-period intensity oscillations in the solar corona observed during the total solar eclipse of 26 February 1998 
    Cowsik, R; Singh, J; Saxena, A. K; Srinivasan, R; Raveendran, A. V (Kluwer Academic Publishers, 1999-08)
    Encouraged by the detection of high-frequency, low-amplitude continuum intensity oscillations in the solar corona during the total solar eclipse of 1995, we designed and fabricated a six-channel photometer incorporating ...
  • SN 1993J in M 81: Optical photometry and spectrophotometry during the first two months 
    Prabhu, T. P; Mayya, Y. D; Singh, K. P; Kameswara Rao, N; Ghosh, K. K; Mekkaden, M. V; Pati, A. K; Raveendran, A. V; Reddy, B. E; Sagar, R; Subramaniam, A; Surendiranath, R (The European Southern Observatory, 1995-03)
    CCD photometric and spectrophotometric data on the type IIb supernova 1993J in M 81 (NGC 3031) obtained from Vainu Bappu Observatory, Kavalur, during the first two months since the outburst are reported. The evolution of ...
  • Spectroscopic Studies of Solar Corona VIII. Temperature and Non-Thermal Variations in Steady Coronal Structures 
    Singh, J; Sakurai, T; Ichimoto, K; Muneer, S; Raveendran, A. V (Springer, 2006-07)
    With a view to investigate variations in parameters of coronal emission lines over a large range of radial distance from the limb, raster scans were made with sufficiently long exposure times on several days during September ...
  • Spot activity in the RS CVn binary DM Ursae Majoris 
    Mekkaden, M. V; Raveendran, A. V; Rosario, M. J; Heckert, P. A (Royal Astronomical Society, 2009-04)
    We present extensive UBVRI photometry of the active RS CVn binary DM UMa obtained at two different observatories over 1988-2008. We find the light curve of the star to be highly variable. The long-term photometry shows no ...
  • Spot activity in the RS CVn binary HR 1099 
    Mekkaden, M. V; Raveendran, A. V; Mohin, S (Indian Academy of Sciences, 1982-03)
    UBV photometry of HR 1099 obtained during the 1979-80 and 1980-81 observing seasons is presented. An analysis of the available data shows that the brightness at the light curve maximum increases as the wave amplitude ...
  • Studies of Pulsating Carbon Stars 
    Raveendran, A. V (Indian Institute of Astrophysics, Bangalore, 1989-10)
  • UBV(RI)_C and UVBY photometry of HD 81410 and starspot distribution in RS CVn objects 
    Mekkaden, M. V; Raveendran, A. V (The European Southern Observatory, 1998-10)
    We present UBVRI and uvby photometry of HD 81410 obtained on a total of 40 nights during 1987-90, and an analysis of its long-term photometric behaviour. The star is found to show two well-separated minima in its light ...
  • UBVR Polarimetry of the Peculiar R-Coronae Star V854-CENTAURI 
    Kameswara Rao, N; Raveendran, A. V (European Southern Observatory, 1993-07)
    We present UBVR polarimetry V 854 Cen obtained on four nights during February 1991-March 1992. Two sets of measurements are close to two nearby light maxima and the other two during the declines when the star was around 4 ...
  • UX Ari: new photometry and longitudinal asymmetry in spot activity fixed in orbital reference frame 
    Rosario, M. J; Mekkaden, M. V; Raveendran, A. V (Konkoly Observatory, 2008-06)
    We present new BV photometry of UX Ari obtained on 23 nights during January-March 2008. From an analysis of the long-term V band photometry available for this star we find strong evidence for the orbital modulation of spot ...
  • Variation of linear polarization in the R Aquarii system 
    Deshpande, M. R; Joshi, U. C; Kulshrestha, A. K; Sen, A. K; Kameswara Rao, N; Raveendran, A. V (Astronomical Society of the Pacific, 1987-01)
    Linear polarization measurements of the R Aqr system are reported here. The R Aqr system shows strong wavelength dependence of percent polarization and position angle, which are strongly time dependent also. There is a ...

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