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Browsing IIAP Publications by Title

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  • Spectrum variability of 25 Sextantis 
    Rajamohan, R; Paranjpye, A; Sajeev, T. P (Kluwer Academic Publishers, 1990-03)
    The identification of moderately strong spectral lines at a dispersion of 30 A per millimeter is given for the peculiar star 25 Sextantis. The observed variability of some of the lines are briefly described. It is found ...
  • Spectrum Variability of HD 147010 
    Kameswara Rao, N; Rajamohan, R (Konkoly Observatory, 1982-04)
  • Spectrum variability of some selected bright CP stars on the main sequence 
    Rajamohan, R (Kluwer Academic Publishers, 1990-03)
    The initial findings of a survey for spectrum variations in selected CP stars is reported. It is found that almost all observed mercury-manganese stars are spectrum variables. The implications of chemical anomalies in these ...
  • The spectrum variable HR 7817 = HD 194783 
    Rajamohan, R; Paranjpye, A (Konkoly Observatory, 1989-01)
  • 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 ...
  • 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 cool flux tubes in the solar chromosphere Linear analysis 
    Hasan, S. S; Kneer, F (EDP Sciences, 1986-04)
    The linear stability of cool flux tubes in the solar chromosphere which are initially in radiative equilibrium is examined. Owing to the presence of carbon monoxide, there exists a narrow region near the temperature minimum ...
  • Stability of cool flux tubes in the solar chromosphere. II - Non-linear dynamical behaviour 
    Hasan, S. S; Kneer, F (The European Southern Observatory, 1990-06)
    A single vertical cool flux tube in the solar chromosphere is focused upon for stability studies. The analysis of a previous study by Hasan and Kneer (1986) is extended to the nonlinear regime with a view to examining the ...

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