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  • The spectrum variable HR 7817 = HD 194783 
    Rajamohan, R; Paranjpye, A (Konkoly Observatory, 1989-01)
  • Spin and torsion in gravitation 
    de Sabbata, V; Sivaram, C (World Scientific Publishing, 1994)
    This book gives an exposition of both the old and new results of spin and torsion effects on gravitational interactions with implications for particle physics, cosmology etc. Physical aspects are stressed and measurable ...
  • Spin angular momentum of tidally affected galaxies 
    Namboodiri, P. M. S; Kochhar, R. K (Royal Astronomical Society, 1991-06)
    Numerical experiments have been performed to study the transfer of angular momentum to an initially non-rotating spherical galaxy as it undergoes a collision with a point mass perturber moving in a relative orbit of constant ...
  • Spin squeezing and quantum correlations 
    Mallesh, K. S; Sirsi, S; Sbaih, M. A. A; Deepak, P. N; Ramachandran, G (Indian Academy of Sciences, 2002-08)
    We discuss the notion of spin squeezing considering two mutually exclusive classes of spin-s states, namely, oriented and non-oriented states. Our analysis shows that the oriented states are not squeezed while non-oriented ...
  • Spin-Dependence of Meson Production in NN Collisions 
    Deepak, P. N; Hanhart, C; Ramachandran, G; Vidya, M. S (World Scientific Publishing Company, 2005-01)
    We present here a model-independent irreducible tensor approach to meson production in NN collisions, which leads to a spin-structure of the T-matrix valid at all energies together with exact partial-wave expansions for ...
  • SPIRITS catalog of infrared variables: identification of extremely luminous long period variables 
    Karambelkar, V. R; Adams, S. M; Whitelock, P. A; Kasliwal, M. M; Jencson, J. E; Boyer, M. L; Goldman, S. R; Masci, F; Cody, A. M; Bally, J; Bond, H. E; Gehrz, R. D; Parthasarathy, M; Lau, R. M; (SPIRITS Collaboration) (IOP Publishing, 2019-06-01)
    We present a catalog of 417 luminous infrared variable stars with periods exceeding 250 days. These were identified in 20 nearby galaxies by the ongoing SPitzer InfraRed Intensive Transients Survey survey with the Spitzer ...
  • SPIRITS: Uncovering Unusual Infrared Transients with Spitzer 
    Kasliwal, M. M; Bally, J; Masci, F; Cody, Ann Marie; Bond, H. E; Jencson, Jacob E; Tinyanont, S; Cao, Y; Contreras, C; Dykhoff, Devin A; Amodeo, Samuel; Armus, L; Boyer, Martha; Cantiello, Matteo; Carlon, Robert L; Cass, Alexander C; Cook, David; Corgan, David T; Faella, Joseph; Fox, O. D; Green, Wayne; Gehrz, R. D; Helou, G; Hsiao, Eric; Johansson, J; Khan, Rubab M; Lau, Ryan M; Langer, Norbert; Levesque, Emily; Milne, Peter; Mohamed, Shazrene; Morrell, N; Monson, Andy; Moore, Anna; Ofek, E. O; O' Sullivan, Donal; Parthasarathy, M; Perez, Andres; Perley, D. A; Phillips, Mark; Prince, Thomas A; Shenoy, Dinesh; Smith, Nathan; Surace, J; Van Dyk, Schuyler D; Whitelock, P. A; Williams, Robert (IOP Publishing, 2017-04-20)
    We present an ongoing, five-year systematic search for extragalactic infrared transients, dubbed SPIRITS—SPitzer InfraRed Intensive Transients Survey. In the first year, using Spitzer/IRAC, we searched 190 nearby galaxies ...
  • Spitzer Mid-IR Spectroscopy of Powerful 2JY and 3CRR Radio Galaxies. II. AGN Power Indicators and Unification 
    Dicken, D; Tadhunter, C; Morganti, R; Axon, D; Robinson, A; Magagnoli, M; Kharb, P; Almeida, C. R; Mingo, B; Hardcastle, M; Nesvadba, N. P. H; Singh, V; Kouwenhoven, M. B. N; Rose, M; Spoon, H; Inskip, K. J; Holt, J (IOP Publishing, 2014-06-20)
    It remains uncertain which continuum and emission line diagnostics best indicate the bolometric powers of active galactic nuclei (AGNs), especially given the attenuation caused by the circumnuclear material and the possible ...
  • The sporadic E layer at Kodaikanal 
    Rangarajan, S (American Geophysical Union, 1954-06)
    An examination of the ionospheric records at Kodaikanal, which is located almost on the geomagnetic equator, reveals that the sporadic E layer here has some regular features not observed at other latitudes. It occurs in ...
  • Sporadic Variations in Wolf-Rayet Stars 
    Shylaja, B. S (International Astronomical Union, 1991)
    Many Wolf-Rayat stars display variations which are observable either spectroscopically or photometrically or both. These are not exclusively associated with binery systems. A study is made of the sporadic events in the ...
  • Sporadic-E associated with the Leonid meteor shower event of November 1998 over low and equatorial latitudes 
    Chandra, H; Sharma, S; Devasia, C. V; Subbarao, K. S. V; Sridharan, R; Sastri, J. H; Rao, J. V. S. V (European Geosciences Union, 2001-01)
    Rapid radio soundings were made over Ahmedabad, a low latitude station during the period 16 20 November 1998 to study the sporadic-E layer associated with the Leonid shower activity using the KEL Aerospace digital ionosonde. ...
  • Spot activity in the RS CVn binary DM Ursae Majoris 
    Mekkaden, M. V; Raveendran, A. V; Rosario, M. J; Heckert, P. A (Royal Astronomical Society, 2009-04)
    We present extensive UBVRI photometry of the active RS CVn binary DM UMa obtained at two different observatories over 1988-2008. We find the light curve of the star to be highly variable. The long-term photometry shows no ...
  • Spot activity in the RS CVn binary HR 1099 
    Mekkaden, M. V; Raveendran, A. V; Mohin, S (Indian Academy of Sciences, 1982-03)
    UBV photometry of HR 1099 obtained during the 1979-80 and 1980-81 observing seasons is presented. An analysis of the available data shows that the brightness at the light curve maximum increases as the wave amplitude ...
  • Spot and filament rotation in a sigmoidal flare 
    Sundararaman, K; Ramesh, K. B; Selvendran, R (Astronomical Society of India, 2001)
    The role played by the rotation of the umbrae in a sunspot with respect to the H? filament in inducing magnetic shear for the sigmoidal brightening is reported in this paper. We carried out these studies by using photoheliogram ...
  • SPOT Modelling in the Rs-Canum System Wy-Cancri 
    Vivekananda Rao, P; Sarma, M. B. K (Astronomical Society of India, 1990)
  • Spot size of 17m-diameter MACE reflector in presence of surface inaccuracies 
    Koul, D. K; Koul, M. K; Tickoo, A. K; Bhat, C. L (Astronomical Society of India, 2002)
    The MACE (for Major Atmospheric Cerenkov Experiment), an imaging cerenkov telescope for gamma-ray astronomy investigations in the sub-TeV energy bracket, plans to use a 17 m-diameter high quality reflecter mounted with a ...
  • Spread-F at Kodaikanal 
    Sastri, J. H; Murthy, B. S (European Geophysical Society, 1975-06)
    Quarter-hourly ionograms of Kodaikanal for the period January 1968 to December 1969 have been examined for occurrence of Spread-F. Spread-F occurrence as a feature on ionograms is more or less a regular nocturnal event ...
  • Squeezing of a coupled state of two spinors 
    Devi, A. R. U; Mallesh, K. S; Sbaih, M. A. A; Nalini, K. B; Ramachandran, G (Institute of Physics Publishing Ltd., 2003-05-16)
    The notion of spin squeezing involves a reduction in the uncertainty of a component of the spin vector vecS below a certain limit. This aspect has been studied earlier (Mallesh et al 2000a <A article="0305-4470/33/4/310">J. ...
  • SS 433: results of a recent multiwavelength campaign 
    Chakrabarti, S. K; Anandarao, B. G; Pal, S; Mondal, S; Nandi, A; Bhattacharyya, A; Mandal, S; Sagar, R; Pandey, J. C; Pati, A. K; Saha, S. K (Royal Astronomical Society, 2005-09)
    We conducted a multiwavelength campaign in 2002 September-October, to observe SS 433. We used the Giant Meter Radio Telescope for radio observations, the Physical Research Laboratory Infrared Telescope at Mt Abu for infrared ...
  • Stability of collinear equilibrium points in the generalised photogravitational elliptic restricted three-body problem 
    Sahoo, S. K; Ishwar, B (Astronomical Society of India, 2000)
    We have examined stability of collinear equilibrium points in the generalised photogravitational elliptic restricted three body problem. The problem is generalised in the sense that the smaller primary is considered as an ...

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