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Browsing by Author "Mekkaden, M. V"

Browsing by Author "Mekkaden, M. V"

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  • The activity in the isolated T Tauri binary V4046 Sagittarii 
    Mekkaden, M. V (International Astronomical Union, 2000)
    New photometric, spectroscopic and polarimetric observations of the T Tauri binary V4046 Sgr are presented. An analysis of the observations obtained over several seasons enabled us to determine the photometric period, and ...
  • Bluer colour of UX Arietis at fainter visual magnitudes 
    Rosario, M. J; Raveendran, A. V; Mekkaden, M. V (EDP Sciences, 2007-11)
    Aims.The RS CVn star UX Ari appears bluer when it is fainter, which is unusual for a spotted star; we aim to resolve this unusual behaviour of the object. Also the data available in the literature indicate that the mean V ...
  • Ca II K Emission in Canopus 
    Bappu, M. K. V; Mekkaden, M. V; Kameswara Rao, N (Astronomical Society of India, 1984-06)
    The Changes in the Ca II K line profile of the F0 supergiant Canopus have been studied from the high dispersion coude spectrograms obtained since 1975. The emission in the core of the line is variable in a timescale of few ...
  • The dependence of He I 10830 absorption on X-ray luminosity in RS CVn binaries and very active F and G main-sequence stars 
    Mekkaden, M. V (Kluwer Academic Publishers, 1985-03)
    A study of the relationship between soft X-ray luminosity and He I 10830 equivalent width in RS CVn binaries and very active late-type main-sequence stars is made. Long-period RS CVns and very active F and G main-sequence ...
  • Evolution of starspot regions in DM UMa 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V; Hall, D. S; Henry, G. W (Kluwer Academic Publishers, 1985-10)
    B andV photometry of DM UMa obtained between January, 1980 and June, 1984 is presented. Analysis yields a mean photometric period 7d.478±0d.010, compared to the known oribital period of 7d.492±0d.009. Light curves obtained ...
  • HD 22403: a New Variable with Ca II H and K Emission 
    Raveendran, A. V; Mohin, S; Mekkaden, M. V (Konkoly Observatory, 1985-03-26)
  • HD 81410 - A new RS CVn binary 
    Raveendran, A. V; Mekkaden, M. V; Mohin, S (Royal Astronomical Society, 1982-05)
    B and V photometry of HD 81410 obtained on 34 nights between January 3 and March 14 of 1981 is presented. In both B and V, the amplitudes are found to be approximately 0.15 mag. It is also found that a 12.86833 day period ...
  • Honda's variable in Cygnus: a new long period variable 
    Prabhu, T. P; Mekkaden, M. V (International Astronomical Union, 1981-02)
  • Il Hydrae: new orbital solutions and bv photometry 
    Raveendran, A. V; Mekkaden, M. V (Konkoly Observatory, 1998-11)
    We present new orbital solutions of the primary of IL Hya combining all the available radial velocity measurements. We also present BV photometry obtained on 9 nights during January--March 1993.
  • Long-term photometric variations of the active RS CVn binaries DM UMa and II Peg 
    Mohin, S; Raveendran, A. V; Mekkaden, M. V (International Astronomical Union, 1995)
  • Longterm Photometry of Variables at ESO - Part Two - the Second Data Catalogue 1986-1990 
    Sterken, C; Manfroid, J; Anton, K; Barzewski, A; Bibo, E; Bruch, A; Burger, M; Duerbeck, H. W; Duemmler, R; Heck, A; Hensberge, H; Hiesgen, M; Inklaar, F; Jorissen, A; Juettner, A; Kinkel, U; Zongli, L; Mekkaden, M. V; Ng, Y. K; Niarchos, P; Puttmann, M; Szeifert, T; Spiller, F; Vandijk, R; Vogt, N; Wanders, I (European Southern Observatory, 1993-11)
    In this paper we present the second catalogue of photometric data in the Stromgren system obtained during the period October 1986 - September 1990 in the framework of the Long-Term Photometry of Variables (LTPV)program at ...
  • The nature of chromospheric active regions on V410 Tauri 
    Mekkaden, M. V; Pukalenthi, S; Muneer, S; Bastian, A. B (Astronomical Society of India, 2005-12)
    We present spectroscopic observations in the region of H alpha and Li I lines of the weak emission T Tauri star V410 Tau obtained over 1999/2000, 2002/2003 and 2003/2004 seasons. The emission strength showed rotational ...
  • 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 ...
  • 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. ...
  • Periodic activity in the T Tauri star TW Hya 
    Mekkaden, M. V (Astronomical Society of India, 1990)
    UBVRI photometry of the isolated T Tauri star TW Hya, obtained during 1987 April from ESO, is presented. The data analysis shows a periodicity of 2.195 d in light variation. The steep increase of amplitude towards shorter ...
  • Photometric and polarimetric variability of the isolated T Tauri star TW Hydrae 
    Mekkaden, M. V (The European Southern Observatory, 1998-12)
    The photometric and polarimetric observations of the isolated T Tauri star TW Hya are presented. It is found that a period 2.196 days derived from the present data satisfies all the available photometry. The steep increase ...
  • 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 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 ...

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