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Browsing IIAP Publications by Title

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  • 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 ...
  • Photon and dimuon pairs in an expanding quark-gluon plasma 
    Datta, B; Raha, S; Sinha, B (Elsevier, 1988-12)
    Diphotons and dimuons escaping the interaction regions in ultra-relativistic heavy-ion collisions are studied in a thermodynamical framework. The relevance of such an analysis for quark-gluon plasma diagnostics is highlighted.
  • Photon escape probabilities in expanding atmospheres 
    Peraiah, A; Rangarajan, K. E; Mohan Rao, D (Indian Academy of Sciences, 1981-03)
    A comparison of mean number of scatterings and escape probabilities has been made in isotropic scattering and dipole scattering by using the angle-averaged partial frequency redistribution functionR I. We have solved the ...
  • Photon polarization in np fusion 
    Ramachandran, G; Deepak, P. N; Kumar, S. P (Institute of Physics Publishing Ltd., 2003-06)
    A model-independent irreducible tensor formalism is developed to discuss photon polarization in np fusion. It is shown that photon polarization arising out of the interference of the dominant isovector M1 amplitude at ...
  • Photospheric field gradient in the neighbourghood of quiescent prominences 
    Nagabushana, B. S; Gokhale, M. H (1989)
    We have determined statistically the horizontal gradiant of the vertical magnetic field in the neighbourhood of filaments inside and outside the active regions during a few months in 1981 and in 1984. The results show ...
  • Photospheric field gradient in the neighbourhood of quiescent prominences 
    Nagabhushana, B. S; Gokhale, M. H (Springer, 1990)
    We have determined statistically the horizontal gradiant of the vertical magnetic field in the neighbourhood of filaments inside and outside the active regions during a few months in 1981 and in 1984. The results show that ...
  • Photospheric Flow Fields and Properties of Embedded Small-scale Magnetic Flux Concentrations 
    Rajaguru, S. P; Srikanth, R; Hasan, S. S (Astronomical Society of the Pacific, 2001)
    The association between the different scales of convection on the solar photosphere and the field strengths/flux contents of discrete magnetic flux elements are analysed using simultaneously recorded SOHO MDI high resolution ...
  • Physical and Optical Properties of Aerosols in a Free Tropospheric Environment: Results From Long-Term Observations Over Western Trans-Himalayas 
    Gogoi, M. M; Moorthy, K. K; Kompalli, S. K; Chaubey, J. P; Babu, S. S; Manoj, M.R; Nair, V. S; Prabhu, T. P (Elsevier B.V., 2014-02)
    Simultaneous and collocated estimates of near-surface mass concentration of black carbon (BC), number size distribution (NSD) and total number concentration (NT) of composite aerosols, columnar spectral aerosol optical ...
  • Physical conditions and chemical abundances of the variable planetary nebula IC 4997 
    Danehkar, A; Parthasarathy, M (Oxford University Press on behalf of the Royal Astronomical Society, 2022-07)
    The planetary nebula (PN) IC 4997 is one of a few rapidly evolving objects with variable brightness and nebular emission around a hydrogen-deficient star. In this study, we have determined the physical conditions and ...
  • The Physical Conditions in a Polar Coronal Hole and Nearby Regions from Norikura and SOHO Observations 
    Raju, K. P; Sakurai, T; Ichimoto, K; Singh, J (The American Astronomical Society, 2000-11)
    The distribution of emission-line intensities, Doppler velocities, and line widths in a polar coronal hole and nearby regions are obtained from the spectroscopic observations carried out on 1998 November 3 at the Norikura ...
  • Physical effects in the Vaidya Einstein Kerr spacetime 
    Ramachandra, B. S; Vishveshwara, C. V (Institute of Physics, 2003-12)
    We investigate some physical effects in the Vaidya Einstein Kerr (VEK) spacetime which represents the spacetime of the Kerr black-hole in the background of the non-flat Einstein universe. We have chosen for our study the ...
  • Physical Interpretation of the Poynting-Robertson Effect 
    Srikanth, R (Academic press, 1999-07)
    Although the prevalent mathematical description of the Poynting-Robertson effect is correct, its physical interpretation is sometimes problematic. By means of a two-parameter model, we revisit the effect in order to get a ...
  • Physical parameters and long-term photometric variability of V1481 Ori, an SB2 member of Orion nebula Cluster with an accreting component 
    Messina, S; Parihar, P. S; Biazzo, K; Lanza, A. F; Distefano, E; Melo, C. H. F; Bradstreet, D. H; Herbst, W (Oxford University Press on behalf of the Royal Astronomical Society, 2016-04)
    We present the results of our analysis on V1481 Ori (JW 239), a young SB2 in the Orion nebula Cluster with a circumbinary disc accreting on the lower mass component. The analysis is based on high-resolution spectroscopic ...
  • Physical parameters of RR Lyrae stars in NGC 6171 
    Deras, D; Arellano Ferro, A; Muneer, S; Giridhar, S; Michel, R (WILEY-VCH Verlag GmbH & Co., 2018-08)
    We present an analysis of VI CCD time series photometry of the globular cluster NGC 6171. The main goal is to determine individual physical parameters for single‐mode RR Lyrae stars present in the field of view of our ...

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