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Browsing IIAP Publications by Title

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  • Photometric Variability of Four Coronally Active Stars 
    Pandey, J. C; Singh, K. P; Sagar, R; Drake, S. A (Indian Academy of Sciences, 2002-03)
    We present photometric observations of four stars that are optical counterparts of soft X-ray/EUV sources, namely 1ES 0829+15.9, 1ES0920-13.6, 2RE J110159+223509 and 1ES 1737+61.2. We have discovered periodic variability ...
  • Photometric Variability of HD 81410 in 1988 
    Mekkaden, M. V; Sinachopoulos, D (Konkoly Observatory, 1988-08-15)
  • Photometric Variability of HR 3119 
    Mekkaden, M. V; Raveendran, A. V; Mohin, S (Konkoly Observatory, 1982-10)
  • Photometric variable stars in the young open cluster NGC 6823 
    Lata, Sneh; Chen, W. P; Pandey, J. C; Dileep, Athul; Ai, Zhong-Han; Hojaev, Alisher S; Panwar, Neelam; Joshi, Santosh; Mondal, Soumen; Biswas, Siddhartha; Bhatt, B. C (Oxford University Press on behalf of Royal Astronomical Society, 2023-03)
    We present stellar variability towards the young open cluster NGC 6823. Time series V- and I-band CCD photometry led to identification and characterization of 88 variable stars, of which only 14 have been previously ...
  • Photometric, polarimetric, and spectroscopic studies of the luminous, slow-decaying Type Ib SN 2012au 
    Pandey, S. B; Amit Kumar; Brajesh Kumar; Anupama, G. C; Srivastav, S; Sahu, D. K; Vinko, J; Aryan, A; Pastorello, A; Benetti, S; Tomasella, L; Singh, A; Moskvitin, A. S; Sokolov, V. V; Gupta, R; Misra, K; Ochner, P; Valenti, S (Oxford University Press on behalf of Royal Astronomical Society, 2021-10)
    Optical, near-infrared (NIR) photometric and spectroscopic studies, along with the optical imaging polarimetric results for SN 2012au, are presented in this article to constrain the nature of the progenitor and other ...
  • 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 ...
  • A photometric-dynamic model to simulate coma and jets from a comet. Application to comet Hale-Bopp (C/1995 O1) 
    Vasundhara, R (EDP Sciences, 2002-01)
    A model to compute the trajectories of dust grains ejected by comets to simulate intensity and polarization maps on the sky plane is presented. The model is used to constrain the silicate to organic mass ratio, porosity ...
  • Photometry and low resolution spectroscopy of hot post-AGB candidates 
    Gauba, G; Parthasarathy, M; Kumar, B; Yadav, R. K. S; Sagar, R (The European Southern Observatory, 2003-06)
    We have obtained Johnson U, B, V and Cousins R, I photometry and low resolution spectra of a small sample of hot post-AGB candidates. Using the present data in combination with JHK data from 2MASS, infrared data from the ...
  • Photometry and spectroscopy of II Peg, IM Peg and UX Ari 
    Dar, A. A; Parihar, P. S; Malik, M. A (IOP Publishing, 2018-08)
    V band photometry of three RS CVn stars, II Peg, IM Peg and UX Ari, is carried out to study the physical properties of these variables. We verified the significant and regular optical photometric variability to be present ...
  • Photometry during the end-phase of a spot cycle in II Peg* 
    Mekkaden, M. V (European Southern Observatory, 1987-07-03)
  • Photometry of BD -7 deg 3007 
    Shylaja, B. S (Kluwer Academic Publishers, 1987-02)
    Photometric observations of BD -7°3007 in B and V filters are reported. Rapid flickering appears to be present at all phases, implying an unfavourable angle of inclination of orbit for seeing eclipse effects. A modulation ...
  • Photometry of EX Hya 
    Shylaja, B. S (Kluwer Academic Publishers, 1985-04)
    Photometric observations of EX Hya in B and V filters are reported. The 67 min modulation of the light curve is also found to be in good agreement with the results of earlier studies. The (B-V) colour variation with respect ...
  • Photometry of HD 166181 
    Mekkaden, M. V; Raveendran, A. V; Mohin, S (Konkoly Observatory, 1980-05)
  • Photometry of HU Tauri 
    Parthasarathy, M; Sarma, M. B. K (D. Reidel Publishing Co., 1980-10)
    Photoelectric observations of the bright eclipsing binary system HU Tauri are presented. The observations were made with standardB andV filters. Observations made during the eclipses yielded six epochs of minimum light. A ...
  • Photometry of intermediate polars AO PSC and V 1223 SGR 
    Padmini, V. N; Marar, T. M. K; Seetha, S; Padmanabhan, P; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C; Kuppuswamy, K; Rozario, M. J (Springer, 1985-12)
    We present optical photometric observations of the cataclysmic variables AO Psc and V 1223 Sgr, both of which are believed to contain slowly-rotating white-dwarf pulsars. These objectes belong to the new class of intermediate ...
  • Photometry of Solar Corona to Study the Coronal Structures 
    Chakraborty, P; Sankarasubramanian, K; Majumder, S; Rajesh Nayak, K; Sridharan, R; Jana, A. D; Rajalakshmi, G; Suresh, D; Asgekar, A; Geetha, K. P; Rajesh, C. K (Indian Institute of Astrophysics, Bangalore, 1997)
    White light images of the solar corona were taken on KODAK 2415 films using 3-inch (f/11.5) telescopes fitted with SLR cameras. Observations were made from 4 different sites spread over the totality belt by four different ...
  • 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 the solar corona during total solar eclipse of October 24, 1995 
    Ananda Rao, B. G; Ashok, N. M; Chandrasekhar, T; Desai, J. N; Nanda Kumar, M. S (Indian Institute of Astrophysics, 1997)
    White light pictures and filter grams in three narrow band interference filters centered on the emission lines In Fe X, Fe XIV and Ca XV have been obtained. We have observed a coronal structure towards the north western ...
  • Photometry of the solar corona of March 7, 1970 
    Bappu, M. K. V; Bhattacharyya, J. C; Sivaraman, K. R (Indian Academy of Sciences, 1973)
    Isophotes obtained by equidensitometry techniques from four exposures of the March 7, 1970 corona are used for derivation of intensity distributions along the equator, poles, streamers and dark ' gaps ' in the visible ...
  • 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 ...

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