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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Measurements of linear polarization of some Herbig Ae/Be stars 
    Jain, S. K; Bhatt, H. C; Sagar, R (The American Physical Society, 1990-05)
    The linear polarization of eight bright Herbig Ae/Be stars in UBVRI bands has been measured. No unique wavelength dependence of polarization magnitude or direction is found in these measurements. Comparison with earlier ...
  • Measurements of photoinduced refractive index changes in bacteriorhodopsin films 
    Banyal, R. K; Prasad, B. R (Indian Academy of Sciences, 2007-03)
    We report the pump--probe measurements of nonlinear refractive index changes in photochromic bacteriorhodopsin films. The photoinduced absorption is caused by pump beam at 532 nm and the accompanying refractive ...
  • Measurements of solar differential rotation using the century long kodaikanal sunspot data 
    Jha, Bibhuti K; Priyadarshi, Aditya; Mandal, Sudip; Chatterjee, Subhamoy; Banerjee, D (Springer, 2021-01)
    The rotational profile of the Sun is considered to be one of the key inputs in a solar dynamo model. Hence, precise and long-term measurements of this quantity is important for our understanding of solar magnetism and its ...
  • Measuring the level of nuclear activity in Seyfert galaxies and the unification scheme 
    Singh, V; Shastri, P; Risaliti, G (EDP Sciences, 2011-09)
    Context. The unification scheme of Seyfert galaxies hypothesizes that Seyfert type 1s and type 2s are intrinsically similar and the observed differences between the two subtypes are solely due to the differing orientations ...
  • A mechanism for injection of ultrahigh energy extragalactic cosmic rays 
    de Sabbata, V; Sivaram, C (International Cosmic Ray, 1990)
  • The MeerKAT Galaxy Cluster Legacy Survey. I. Survey Overview and Highlights 
    Knowles, K; Cotton, W. D; Rudnick, L; Camilo, F; Goedhart, S; Deane, R; Ramatsoku, M; Bietenholz, M. F; Bruggen, M; Button, C; Chen, H; Ranchod, S; Retana-Montenegro, E; Sebokolodi, L; Sikhosana, S. P; Smirnov, O; Cheetham, T; Thorat, K; Venturi, T; Abbott, T. D; Adam, R. M; Kotze, A. G; Adams, G; Aldera, M. A; Bauermeister, E. F; Bennett, T. G. H; Bode, W. A; Botha, D. H; de Villiers, D. I. L; Botha, A. G; Dikgale-Mahlakoana, M. A; du Toit, L. J; Kriek, N; Esterhuyse, S. W. P; Fadana, G; Fanaroff, B. L; Manley, J. R; Fataar, S; Foley, A. R; Fourie, D. J; Frank, B. S; Gamatham, R. R. G; Gatsi, T. G; Kriel, H; Geyer, M; Gouws, M; Gumede, S. C; Heywood, I; Marais, S. J; Hlakola, M. J; Hokwana, A; Hoosen, S. W; Horn, D. M; Horrell, J. M. G; Krishnan, V. K; Hugo, B. V; Isaacson, A. R; Jonas, J. L; Jordaan, J. D. B; Joubert, A. F; Maree, M. D. J; Julie, R. P. M; Kapp, F. B; Kasper, V. A; Kenyon, J. S; Kusel, T. W; Kotze, P. P. A; Martens, A; Legodi, L. S; Lehmensiek, R; Liebenberg, D; Lord, R. T; Taljaard, B; Lunsky, B. M; Madisa, K; Magnus, L. G; Main, J. P. L; Makhaba, A; Makhathini, S; Mauch, T; Malan, J. A; McAlpine, K; Merry, B. C; Tasse, C; Millenaar, R. P; Mokone, O. J; Monama, T. E; Chibueze, J. O; Mphego, M. C; New, W. S; Ngcebetsha, B; Ngoasheng, K. J; Ockards, M. T; Otto, A. J; Tiplady, A. J; Patel, A. A; Peens-Hough, A; Perkins, S. J; Ramanujam, N. M; Clarke, T. E; Ramudzuli, Z. R; Ratcliffe, S. M; Renil, R; Robyntjies, A; Rust, A. N; Toruvanda, O; Salie, S; Sambu, N; Schollar, C. T. G; Schwardt, L. C; Schwartz, R. L; Gasperin, F. de; Serylak, M; Siebrits, R; Sirothia, S. K; Slabber, M; Twum, S. N; Sofeya, L; Ianjamasimanana, R; van Balla, T. J; van der Byl, A; van der Merw, C; van Dy, C. L; Brederode, L. R. S; Van Tonder, V; Van Wyk, R; Venter, A. J; Venter, M; Welz, M. G; William, L. P; Jozsa, G. I. G; Xaia, B; Hilton, M; Kesebonye, K. C; Buchner, S; Kolokythas, K; Kraan-Korteweg, R. C; Lawrie, G; Lochner, M; Loubser, S. I; Marchegiani, P; Mhlahlo, N; Moodley, K; Murphy, E; Namumba, B; Burger, J. P; Oozeer, N; Parekh, V; Pillay, D. S; Passmoo, S. S; Ramaila, A. J. T (EDP Sciences, 2022-01)
    MeerKAT’s large number (64) of 13.5 m diameter antennas, spanning 8 km with a densely packed 1 km core, create a powerful instrument for wide-area surveys, with high sensitivity over a wide range of angular scales. The ...
  • Membership of stars in faint galactic open clusters 
    Babu, G. S. D (Indian Academy of Sciences, 1983-12)
    Low-dispersion spectra of the order of 1000 Å mm-1 have been obtained for stars in several faint galactic clusters with a transmission grating placed in front of the photographic plate at the Cassegrain focus of the Kavalur ...
  • Membrane-based deformable mirror: intrinsic aberrations and alignment issues 
    Bayanna, A. R; Louis, R. E; Chatterjee, S; Mathew, S. K; Venkatakrishnan, P (Optical Society of America, 2015-03-01)
    A deformable mirror (DM) is an important component of an adaptive optics system. It is known that an on-axis spherical/parabolic optical component, placed at an angle to the incident beam introduces defocus as well as ...
  • Memoirs of the Kodaikanal Observatory, Volume II: An Atlas of Equatorial Ionograms 
    Bhargava, B. N; Saha, A. K (Kodaikanal Observatory, Kodaikanal, 1967)
  • Mercury monohalides: suitability for electron electric dipole moment searches 
    Srinivasa Prasannaa, V; Vutha, A. C; Abe, M; Das, B. P (The American Physical Society, 2015-05)
    Heavy polar diatomic molecules are the primary tools for searching for the T-violating permanent electric dipole moment of the electron (eEDM). Valence electrons in some molecules experience extremely large effective ...
  • Merger Models of Gamma-Ray Bursts: A Comparison 
    Sivaram, C (International Union of Pure and Applied Physics, 1995)
    Two possible merger modes of gamma ray bursts are considered. The merger of two white dwarfs leading to a neutrino bursts accompanying the gamma ray burst. However the merger of two neutron stars should give rise to only ...
  • Meridional circulation in the solar convection zone: time-distance helioseismic inferences from four years of HMI/SDO observations 
    Rajaguru, S. P; Antia, H. M (IOP Publishing, 2015-11-10)
    We present and discuss results from time–distance helioseismic measurements of meridional circulation (MC) in the solar convection zone using 4 yr of Doppler velocity observations by the Helioseismic and Magnetic Imager ...
  • The metal-poor end of the Spite plateau I. Stellar parameters, metallicities, and lithium abundances 
    Sbordone, L; Bonifacio, P; Caffau, E; Ludwig, H. -G; Behara, N. T; González Hernández, J. I; Steffen, M; Cayrel, R; Freytag, B; Van’t Veer, C; Molaro, P; Plez, B; Sivarani, T; Spite, M; Spite, F; Beers, T. C; Christlieb, N; François, P; Hill, V (EDP Sciences, 2010-11)
    Context. The primordial nature of the Spite plateau is at odds with the WMAP satellite measurements, implying a primordial Li production at least three times higher than observed. It has also been suggested that A(Li) might ...
  • The metal-poor end of the Spite plateau. II. Chemical and dynamical investigation 
    Pinto, A. M. Matas; Spite, M; Caffau, E; Bonifacio, P; Sbordone, L; Sivarani, T; Steffen, M; François, P; Di Matteo, P (EDP Sciences, 2021-10)
    Context. The study of old, metal-poor stars deepens our knowledge on the early stages of the universe. In particular, the study of these stars gives us a valuable insight into the masses of the first massive stars and their ...
  • Metallicity of Sun-like G-stars that have exoplanets 
    Gurumath, S. R; Hiremath, K. M; Ramasubramanian, V (Indian Academy of Sciences, 2017-07)
    By considering the physical and orbital characteristics of G type stars and their exoplanets, we examine the association between stellar mass and its metallicity that follows a power law. Similar relationship is also ...
  • The metal–poor end of the Spite plateau 
    Sbordone, L; Bonifacio, P; Caffau, E; Ludwig, H. -G; Behara, N; Gonzalez-Hernandez, J. I; Steffen, M; Cayrel, R; Freytag, B; Van't Veer, C; Molaro, P; Plez, B; Sivarani, T; Spite, M; Spite, F; Beers, T. C; Christlieb, N; François, P; Hill, V (Cambridge University Press, 2010-03)
    We present the largest sample available to date of lithium abundances in extremely metal poor (EMP) Halo dwarfs. Four Teff estimators are used, including IRFM and Hα wings fitting against 3D hydrodynamical synthetic ...
  • The metal–poor end of the Spite plateau: gravity sensitivity of the Hα wings fitting. 
    Sbordone, L; Bonifacio, P; Caffau, E; Ludwig, H. -G; Behara, N; Gonzalez-Hernandez, J. I; Steffen, M; Cayrel, R; Freytag, B; Van't Veer, C; Molaro, P; Plez, B; Sivarani, T; Spite, M; Spite, F; Beers, T. C; Christlieb, N; François, P; Hill, V (Cambridge University Press, 2010-04)
    We recently presented (Sbordone et al., 2009a) the largest sample to date of lithium abundances in extremely metal-poor (EMP) Halo dwarf and Turn-Off (TO) stars. One of the most crucial aspects in estimating Li abundances ...
  • Method for tilt correction of calibration lines in high-resolution spectra 
    Das, Tanya; Banyal, R. K (Optical Society of America, 2021-11-01)
    Technological advancement has led to improvement in the design capabilities of astronomical spectrographs, allowing for high-precision spectroscopy, thereby expanding the realms of observational astronomy. High-resolution ...
  • A method to determine distances to molecular clouds using near-IR photometry 
    Maheswar, G; Lee, C. W; Bhatt, H. C; Mallik, S. G. V; Dib, S (EDP Sciences, 2010-01)
    We aim to develop a method to determine distances to molecular clouds using JHK near-infrared photometry. Methods: The method is based on a technique that aids spectral classification of stars lying towards the fields ...
  • Metric observations of transient, quasi-periodic radio emission from the solar corona in association with a ``halo'' CME and an ``EIT wave'' event 
    Ramesh, R; Kathiravan, C; Satya Narayanan, A; Ebenezer, E (The European Southern Observatory, 2003-03)
    We present metric radio observations of quasi-periodic emission from the solar corona in close association with a ``halo'' CME and an ``EIT wave'' phenomenon. The radio event lasted for about 60 s. Its mean periodicity was ...

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