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Browsing by Author "Raveendran, A. V"

Browsing by Author "Raveendran, A. V"

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  • Long-term polarimetric behaviour of the carbon Mira R Leporis 
    Raveendran, A. V; Kameswara Rao, N (European Southern Observatory, 1989-05)
    BVRI polarimetry of R Lep obtained during 1984-1987 shows large changes in the normalized wavelength dependence of polarization. It is found that both the amount and position angle of polarization had components which ...
  • Near simultaneous BV photometry and Hα spectroscopy of the RS Canum Venaticorum binary DM Ursae Majoris 
    Mohin, S; Raveendran, A. V (European Southern Obseravatory, 1994-06)
    Differential BV photometry of DM UMa obtained over 19 nights and near simultaneous Hα spectroscopy obtained over 7 nights during the 1990-91 observing season are presented. From an analysis of the available data we find ...
  • A new three-band, two beam astronomical photo-polarimeter 
    Srinivasulu, G; Raveendran, A. V; Muneer, S; Mekkaden, M. V; Jayavel, N; Somashekar, M. R; Sagayanathan, K; Ramamoorthy, S; Rosario, M.; Jayakumar, K (Astronomical Society of India, 2014-09)
    We designed and built a new astronomical photo-polarimeter that can measure linear polarization simultaneously in three spectral bands. It has a Calcite beamdisplacement prism as the analyzer. The ordinary and extra-ordinary ...
  • Observations of variables 
    Rosario, M. J; Muneer, S; Raveendran, A. V; Mekkaden, M. V (IBVS / Konkoly Observatory, 2010-12)
    UX Ari was observed on a total of 33 nights during December 2008-February 2010 in standard Johnson BV bands with the 34-cm tel escope of Vainu Bappu Observatory, Kavalur. All the measurements were made with respect to 62 ...
  • Observations of X-Per in optical domain 
    Sharma, D. P; Nagaraja, B. V; Bhattacharyya, J. C; Mohin, S; Raveendran, A. V (Kluwer Academic Publishers, 1983-09)
    We have monitored the X-ray source X-Per (4U 0352+30) on 31 August, 1979 through aU filter for about 1.5 hr using 102-cm telescope of Kavalur observatory. During this period intensity of X-Per fluctuated for some time, on ...
  • On the correlation between polarization and brightness in the RV Tauri Star AR Puppis 
    Raveendran, A. V (Kluwer Academic Publishers, 1999)
  • On the photometric period of HD 81410 
    Raveendran, A. V; Mekkaden, M. V; Mohin, S (Konkoly Observatory, 1981-06)
  • Orbital period modulation and spot activity in the RS CVn binary V711 Tauri 
    Muneer, S; Jayakumar, K; Rosario, M. J; Raveendran, A. V; Mekkaden, M. V (EDP Sciences, 2010-10)
    We attempt to establish the real nature of the orbital period variation and its relation to the spot activity of V711 Tau, and determine why the (B–V) colour of the star appears to be nearly independent of its V magnitude. ...
  • Photometric and polarimetric observations of the Rv-tauri star Ar-Puppis 
    Raveendran, A. V; Kameswara Rao, N (Springer, 1988)
  • Photometric and radial velocity variations of RCrB near maximum light 
    Raveendran, A. V; Ashoka, B. N; Kameswara Rao, N (D. Reidel Publishing Co, 1986)
    Fourier analysis of the light curves of R CrB in the V band near maximum shows that in addition to several significant short periods there is a modulation of the visual light with a period around 1170 days, similar to that ...
  • Photometric Study of HD224085 
    Raveendran, A. V; Mohin, S; Mekkaden, M. V (Royal Astronomical Society, 1981-07)
    B and V photometry of HD 224085 obtained on 21 nights between 1979 November and 1980 February is presented. The amplitudes of light variation observed are ~ 0.15mag in both B and V. The photometric period is found to be ...
  • Photometric study of the RS CVn binary DM Ursa Majoris 
    Mohin, S; Raveendran, A. V (EDP Sciences, 1992-03)
    Differential BV photometry of DM UMa obtained on 77 nights during the six observing seasons over the years 1984-90 is presented. The phases of the light minima observed during 1988-90 are found to be nearly the same. The ...
  • Photometric study of the RS CVn binary II Pegasi 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V (Astronomical Society of Indian, 1986-03)
    An analysis of available data and of B and V photometry obtained at Kavalur on 39 nights during the 1980-81, 1981-82, and 1984-85 observing seasons of II Peg shows no two light curves to agree in shape, amplitude, phases ...
  • Photometric Variability of HR 3119 
    Mekkaden, M. V; Raveendran, A. V; Mohin, S (Konkoly Observatory, 1982-10)
  • Photometric, spectroscopic and polarimetric variability of the weak-emission T Tauri star HD 288313 
    Mekkaden, M. V; Muneer, S; Raveendran, A. V (Blackwell Publishing, 2007-07)
    Photometric observations over three seasons show HD 288313 to be a light variable with a 2.2636-d period. The observed V amplitudes lie in the range of 0.06–0.15 mag. The star showed appreciable changes in the brightness ...
  • Photometry of HD 166181 
    Mekkaden, M. V; Raveendran, A. V; Mohin, S (Konkoly Observatory, 1980-05)
  • Photometry of the Rs-Canum Binary II-PEG 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V (International Astronomical Union, 1986)
    B and V photometry of II Peg obtained at Kavalur on 39 nights during 1980 - 81, 1981 - 82 and 1984 - 85 is presented. From an analysis of the available data on this object the authors find that no two light curves agree ...
  • Photometry of Zeta Aurigae during the 1977 and 1979-80 Eclipses 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V (Indian Institute of Astrophysics, Bangalore, 1980)
    UBV photometry of Zeta Aurigae during the 1977 and 1979-80 eclipses is presented. From an analysis of the available photometry, it is concluded that the long term intrinsic variation in the brightness of the late-type super ...
  • Polarimetric observations of hydrogen deficient stars 
    Raveendran, A. V; Kameswara Rao, N; Deshpande, M. R; Joshi, U. C; Kulshrestha, A. K (Reidel Publishing Company, 1986)
    Polarimetric observations of HD 30353, SU Tau, XX Cam, R CrB, UV Cas, BD +13°3224, BD +10°2179 and HD 124448 are presented. The linear polarization of HD 30353 is found to vary appreciably at Hα over a time scale as short ...
  • Polarimetric observations of the RV Tauri star AR Puppis 
    Raveendran, A. V; Kameswara Rao, N (European Southern Observatory, 1988-03)
    UBVRI polarimetry of AR Pup is presented. Large variations are seen both in the amount and direction of polarization. On one occasion, the polarization in U was found to be as high as 14.6 percent. Polarization level ...

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