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Browsing by Author "Mekkaden, M. V"

Browsing by Author "Mekkaden, M. V"

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  • Recent photometry of HR 1099 (V711 Tau) 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V; Jayakumar, K; Rosario, M. J (Konkoly Observatory, 1982-08)
  • Rotation and H-alpha emission activity in F8-G3 dwarfs 
    Mekkaden, M. V (Kluwer Academic Publishers, 1985-12)
    The dependence of H-alpha emission strength on rotational period and spectral type in late-type stars is studied using published data. The emission strength shows strong correlation with rotation irrespective of age and ...
  • RS CVn-type variables. I - Photometry of HR 1099 
    Parthasarathy, M; Raveendran, A. V; Mekkaden, M. V (D. Reidel Publishing Co., 1981-01)
    Photometric observation of HR 1099 inV andB obtained on 18 nights between January and March 1977 is presented. The amplitude of the asymmetric light curve is found to be 0m.10±0m.004 both inV andB. On three occasions—namely, ...
  • Search for activity signatures in T Thuri stars 
    Mekkaden, M. V (Astronomical Society of India, 2002-09)
    T Tauri stars are young, low mass, pre-main sequence stars. They exhibit a large variety of properties characteristic of earlier as well as later evolutionary phases and represent an important phase in the stellar ...
  • 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 ...
  • 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 Activity in Late Type Stars 
    Mekkaden, M. V (Indian Institute of Astrophysics, Bangalore, 1996-04)
  • 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 ...
  • 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 ...
  • The variation of photospheric active regions in HD 127535 
    Mekkaden, M. V; Geyer, E. H (European Southern Observatory, 1988-04)
    UBVRI photometry of the chromospherically active star HD 127535 obtained during April 1987 is presented. The analysis shows that the light variation is quasi-sinusoidal and the amplitude and the phase of the light minimum ...

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