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Browsing IIAP Publications by Title

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  • Association of calcium network brightness with polar magnetic fields 
    Narang, Nancy; Chandrashekhar, K; Pant, V; Banerjee, D (Cambridge University Press, 2018-02)
    Recent dedicated HINODE polar region campaign revealed the presence of concentrated kilogauss patches of magnetic field in the polar regions of Sun which are also shown to be correlated with facular bright points at the ...
  • Association of Plages with Sunspots: A Multi-Wavelength Study Using Kodaikanal Ca ii K and Greenwich Sunspot Area Data 
    Mandal, Sudip; Chatterjee, Subhamoy; Banerjee, D (IOP Publishing, 2017-02-01)
    Plages are the magnetically active chromospheric structures prominently visible in the Ca ii K line (3933.67 Å). A plage may or may not be associated with a sunspot, which is a magnetic structure visible in the solar ...
  • Association of Supergranule Mean Scales with Solar Cycle Strengths and Total Solar Irradiance 
    Mandal, Sudip; Chatterjee, Subhamoy; Banerjee, D (IOP Publishing, 2018-09)
    We analyze the long-term behavior of the supergranule scale parameter, in active regions (ARs) and quiet regions (QRs), using the Kodaikanal digitized data archive. This database provides century-long daily full ...
  • The asteroseismic potential of Kepler: first results for solar-type stars 
    Chaplin, W. J; Appourchaux, T; Elsworth, Y; Garcia, R. A; Houdek, G; Karoff, C; Metcalfe, T. S; Molenda-Zakowicz, J; Monteiro, M. J. P. F. G; Thompson, M. J; Brown, T. M; Kiss, L. L; Kitiashvili, I. N; Kolenberg, K; Korhonen, H; Kosovichev, A. G; Kupka, F; Lebreton, Y; Leroy, B; Ludwig, H. G; Mathis, S; Michel, E; Miglio, A; Montalban, J; Moya, A; Noels, A; Noyes, R. W; Palle, P. L; Piau, L; Preston, H. L; Roca Cortes, T; Roth, M; Sato, K. H; Schmitt, J; Serenelli, A. M; Silva Aguirre, V; Stevens, I. R; Suarez, J. C; Suran, M. D; Trampedach, R; Turck-Chieze, S; Uytterhoeven, K; Ventura, R; Christensen-Dalsgaard, J; Gilliland, R. L; Kjeldsen, H; Borucki, W. J; Koch, D; Jenkins, J. M; Ballot, J; Basu, S; Bazot, M; Bedding, T. R; Benomar, O; Bonanno, A; Brandao, I. M; Bruntt, H; Campante, T. L; Creevey, O. L; Di Mauro, M. P; Dogan, G; Dreizler, S; Eggenberger, P; Esch, L; Fletcher, S. T; Frandsen, S; Gai, N; Gaulme, P; Handberg, R; Hekker, S; Howe, R; Huber, D; Korzennik, S. G; Lebrun, J. C; Leccia, S; Martic, M; Mathur, S; Mosser, B; New, R; Quirion, P. O; Regulo, C; Roxburgh, I. W; Salabert, D; Schou, J; Sousa, S. G; Stello, D; Verner, G. A; Arentoft, T; Barban, C; Belkacem, K; Benatti, S; Biazzo, K; Boumier, P; Bradley, P. A; Broomhall, A. M; Buzasi, D. L; Claudi, R. U; Cunha, M. S; D'Antona, F; Deheuvels, S; Derekas, A; Garcia Hernandez, A; Giampapa, M. S; Goupil, M. J; Gruberbauer, M; Guzik, J. A; Hale, S. J; Ireland, M. J (IOP Publishing, 2010-04)
    We present preliminary asteroseismic results from Kepler on three G-type stars. The observations, made at one-minute cadence during the first 33.5d of science operations, reveal high signal-to-noise solar-like oscillation ...
  • Asteroseismology Sheds Light on the Origin of Carbon-deficient Red Giants: Likely Merger Products and Linked to the Li-rich Giants 
    Maben, Sunayana; Campbel, Simon W; Bharat Kumar, Y; Reddy, B. E; Zhao, Gang (IOP Publishing, 2023-11-01)
    Carbon-deficient red giants (CDGs) are a peculiar class of stars that have eluded explanation for decades. We aim to better characterize CDGs by using asteroseismology (Kepler, TESS) combined with spectroscopy (APOGEE, LAMOST), ...
  • Astreaks: astrometry of NEOs with trailed background stars 
    Sharma, Kritti; Kumar, Harsh; Choudhary, Harsh; Bhalerao, Varun; Swain, Vishwajeet; Bolin, Bryce; Anupama, G. C; Barway, Sudhanshu; Joharle, Simran; Shenoy, Vedant (Oxford University Press on behalf of Royal Astronomical Society, 2023-09)
    The detection and accurate astrometry of fast-moving near-Earth objects (NEOs) has been a challenge for the follow-up community. Their fast apparent motion results in streaks in sidereal images, thus affecting the telescope’s ...
  • Astrometric results of observations of mutual occultations and eclipses of the Uranian satellites in 2007 
    Arlot, J.-E; Emelyanov, N. V; Aslan, Z; Assafin, M; Bel, J; Bhatt, B. C; Braga-Ribas, F; Camargo, J. I. B; Casas, R; Colas, F; Coliac, J. F; Dumas, C; Ellington, C. K; Forne, E; Frappa, E; Khamitov, I; Miller, C; Modic, R. J; Sahu, D. K; Sicardy, B; Tanga, P; Sada, P. V; Vasundhara, R; Vieira-Martins, R (EDP Sciences, 2013-09)
    Context. The photometry of mutual occultations and eclipses of natural planetary satellites can be used to infer very accurate astrometric data. This can be achieved by processing the light curves of the satellites observed ...
  • Astrometry from CCD photometry of mutual events of Jovian satellites from VBO during 1997 
    Vasundhara, R (EDP Sciences, 2002-07)
    Astrometric results of CCD observations of the mutual events of the Galilean satellites of Jupiter from the Vainu Bappu Observatory are presented. The shifts in the photo-centers on the disks of Io and Europa due to albedo ...
  • Astrometry from mutual events of Jovian satellites in 1997 
    Vasundhara, R; Arlot, J. E; Lainey, V; Thuillot, W (The European Southern Observatory, 2003-10)
    Astrometric results of observations of the mutual events of the Galilean satellites of Jupiter of the PHEMU97 campaign by the Institut de Mécanique Céleste et de Calcul des Éphémérides are presented. These astrometric ...
  • The astronomical seeing at Kavalur. 
    Bappu, M. K. V; Mohin, S; Unnikrishnan, K. G (Indian Institute of Astrophysics, 1978)
    A summary of observing conditions at Kavalur Observatory is p0resented. These related to spectroscopic and photometric observations and to seeing as evaluated at the 102cm telescope. Nearly fifty percent of nights on which ...
  • The astronomical significance of megalithic stone alignments at Vibhuthihalli in Northern Karnataka 
    Kameswara Rao, N; Thakur, Priya (Centre for Astronomy, James Cook University, 2010-03)
    A megalithic site at Vihuthihalli in Karnataka, India, contains alignments of stones that are arranged in a square pattern with rows and columns showing a diagonal arrangement. Such structures are non-sepulchral, and ...
  • The astronomical significance of ‘Nilurallu’, the megalithic stone alignment at Murardoddi In Aandhra Pradesh, India 
    Kameswara Rao, N; Thakur, Priya; Mallinathpur, Y (Centre for Astronomy, James Cook University, 2011-11)
    The stone alignment ‘Nilurallu' at Murardoddi is a megalithic monument containing standing stones of 12 to 16 feet high that are arranged somewhat in a squarish pattern. This is one of the stone alignments listed by Allchin ...
  • Astronomical site survey report on dust measurement, wind profile, optical turbulence, and their correlation with seeing over IAO-Hanle 
    Shantikumar, S. N; Kathiravan, S; Parihar, P. S; Larson, E. J. L; Sharika Mohanan; Angchuk, D; Jorphel, Sonam; Rangarajan, K. E; Prabhu, K (Springer Netherlands, 2017-04)
    The present work discusses astronomical site survey reports on dust content, vertical distribution of atmospheric turbulence, precipitable water vapor (PWV), surface and upper-air data, and their effects on seeing over the ...
  • Astronomy in British India:Science in the service of the state 
    Kochhar, R. K (Indian Academy of Sciences, 1991-01-25)
  • Astronomy in India in the 20th century. 
    Bhattacharyya, J. C; Vagiswari, A (Indian National Science Academy, 1985)
  • Astronomy with Vainu Bappu Telescope 
    Kameswara Rao, N (Astronomical Society of India, 1995-09)
  • Astrophotography with high angular and temporal resolution: Preliminary results from the Kavalur Experiments 
    Saha, S. K; Venkatakrishnan, P; Jayarajan, A. P; Jayavel, N (Indian Academy of Sciences, 1987-10)
    Preliminary results in the form of photographs obtained with high angular (≈ 0.”1) and temporal ( ≈ 33 to 6ms) resolutions using 1-m reflector at the Vainu Bappu Observatory in Kavalur are presented. These results demonstrate ...
  • Astrophysical consequences of barytinos 
    Sivaram, C (Springer, 1983-01)
    Some astrophysical consequences of the newly introduced barytino (massless fermions having baryon number, analogous to the massless neutrino having lepton number) are considered. It is pointed out that the existence of ...
  • Astrophysical consequences of n-nmacr oscillations - (Reply) 
    Sivaram, C; Krishan, V (Nature Publishing Group, 1984-06)
  • Astrophysical consequences of neutron-antineutron oscillations 
    Krishan, V; Sivaram, C (Springer, 1982-10)
    Grand unified theories predict baryon number violating interactions and one of the implications of this is the possible existence of neutron-antineutron oscillations. The neutron-antineutron oscillations have been considered ...

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