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Browsing IIAP Publications by Title

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  • R. LI. Jones-C. V. Raman's physics professor at presidency college Madras 
    Kochhar, R. K (Indian Academy of Sciences, 1990-01-10)
  • The RACE-OC project: Rotation and ACtivity Evolution in Open Clusters 
    Messina, S; Distefano, E; Parihar, P. S; Busa, I; Cutispoto, G; Lanza, A.F; Lanzafame, A; Pagano, I; Biazzo, K; Leto, G; Hatzidimitriou, D; Kim, S. -L; Koo, J. -R; Kang, Y. B (American Institute of Physics, 2009)
    The RACE‐OC project, standing for Rotation and Activity Evolution in Open Clusters, is a long‐term project aimed at studying the evolution of rotation and magnetic activity of late‐type members of stellar open clusters. ...
  • RACE-OC project: rotation and variability in the open cluster M 11 (NGC 6705) 
    Messina, S; Parihar, P. S; Koo, J. R; Kim, S. L; Rey, S. C; Lee, C. U (EDP Sciences, 2010-04)
    Rotation and magnetic activity are intimately linked in main-sequence stars of G or later spectral types. The presence and level of magnetic activity depend on stellar rotation, and rotation itself is strongly influenced ...
  • RACE-OC project: rotation and variability in the open cluster NGC 2099 (M 37) 
    Messina, S; Distefano, E; Parihar, P. S; Kang, Y. B; Kim, S. -L; Rey, S. -C; Lee, C. -U (EDP Sciences, 2008-05)
    Context. Rotation and solar-type magnetic activity are closely related to each other in main-sequence stars of G or later spectral types. The presence and level of magnetic activity depend on star's rotation, and rotation ...
  • RAD@home citizen science discovery of an active galactic nucleus spewing a large unipolar radio bubble on to its merging companion galaxy 
    Hota, Ananda; Dabhade, Pratik; Vaddi, Sravani; Konar, Chiranjib; Pal, Sabyasachi; Gulati, Mamta; Stalin, C. S; Avinash, Ck; Kumar, Avinash; Rajoria, Megha; Purohit, Arundhati (Oxford University Press on behalf of Royal Astronomical Society, 2022-11)
    Active galactic nucleus (AGN) feedback during galaxy merger has been the most favoured model to explain black hole–galaxy co-evolution. However, how the AGN-driven jet/wind/radiation is coupled with the gas of the merging ...
  • Radial distribution of Blue Stragglers in NGC 5466 using AstroSat 
    Snehalata Sahu; Subramaniam, A (Cambridge University Press, 2019-05)
    We present the results obtained from Near-UV observations of the cluster NGC 5466 taken with UVIT onboard AstroSat to study the radial distribution of Blue Straggler Stars (BSSs), covering the cluster region up to a radius ...
  • Radial distribution of the integrated light and photometric colours in open star clusters 
    Sagar, R; Bhatt, H. C (Indian Academy of Sciences, 1989-06)
    Mass segregation in the form of preferential concentration of more massive stars in the central regions of a number of open star clusters has been known for some time. In this paper, integrated UBV colors in concentric ...
  • Radial modes of rotating neutron stars in the Chandrasekhar-Friedman formalism 
    Datta, B; Hasan, S. S; Sahu, P. K; Prasanna, A. R (World Scientific Publishing Company, 1998-02)
    Eigenfrequencies of radial pulsations of "slowly" rotating neutron stars are calculated in a general relativistic formalism given by Chandrasekhar and Friedman (1972). It is found that the square of the frequencies are ...
  • Radial movement in Sunspots 
    Evershed, John (Indian Institute of Astrophysics, Bangalore, 1909-02-03)
  • Radial Sizes and Expansion Behavior of ICMEs in Solar Cycles 23 and 24 
    Mishra, Wageesh; Doshi, Urmi; Srivastava, Nandita (Frontiers, 2021-09)
    We attempt to understand the influence of the heliospheric state on the expansion behavior of coronal mass ejections (CMEs) and their interplanetary counterparts (ICMEs) in solar cycles 23 and 24. Our study focuses on ...
  • Radial velocities of seven Sersic galaxies 
    Prabhu, T. P (Indian Institute of Astrophysics, 1978)
    The radial velocities of 7 Sersic galaxies are reported. Three out of these (NGC 2903, 2997 and 5236) have published radial velocities prior to this work while the radial velocities of four remaining galaxies (NGC 922, ...
  • Radial velocity comparison of Gaia DR2 and RAVE DR5 survey: A systematic offset in radial velocities among a group of highly accurate radial velocity stars 
    Deepak; Reddy, B. E (IOP Publishing, 2018-10)
    Here, we report a comparative study of radial velocity (RV) data of two major surveys: Gaia Data Release 2 and RAVE Data Release 5. We restricted the sample to stars with relatively accurate RVs. The difference between ...
  • Radiation Flux in Sunspot Umbrae 
    Ramanathan, A. S (Springer-Verlag, 1954)
    The ratio of umbral intensity to photospheric intensity as a function of wavelength has been studied in the case of four fairly large spots in the wavelength range 4000A - 6500A. The relative spectrophotometric gradient ...
  • Radiation from an electron beam-magnetoplasma 
    Krishan, V (Institute of Physics, 1980-08)
    The possibility of direct generation of electromagnetic radiation at and near electron plasma frequency from an electron beam-magnetoplasma system is explored. The role of the electron beam is replaced by the electron ...
  • Radiation of the fifth-force field 
    Bertotti, B; Sivaram, C (Springer, 1991-11)
    The «fifth-force» field, if it exists, has radiative effects in competition with the gravitational radiation. Since this field violates the Principle of Equivalence, it may affect a gravitational wave detector more than a ...
  • Radiation pressure in resonance lines 
    Peraiah, A (Indian Institute of Astrophysics, 1979-11)
    The effects of large scales gas motions on the radiation pressure in a resonance lines are investigated. We have assumed a medium with pure scattering together with emission in the continuum. A linear velocity law is ...
  • Radiative Capture of Polarized Neutrons by Polarized Protons 
    Ramachandran, G; Deepak, P. N (World Scientific Publishing, 2004-06)
    A model-independent irreducible tensor approach is presented for the np fusion reaction. Appropriate spin-observables are identified to determine empirically the initial spin singlet and triplet contributions to the ...
  • Radiative neutrino decay in hot media 
    Nieves, J. F; Pal, P. B (The American Physical Society, 1997-07)
    We calculate the rate for the radiative neutrino decay in a thermal background of electrons and photons, taking into account the effect of the stimulated emission of photons in the thermal bath. We show that the rate is ...
  • A Radiative Transfer Calculation Using R(III) in an Expanding Spherically Symmetric Stellar Atmosphere 
    Singh, P (Royal Astronomical Society, 1994-07)
    With the availability of very high-resolution stellar spectra, even small differences between line profiles resulting from complete redistribution and partial frequency redistribution may be important in the quantitative ...
  • Radiative Transfer Effects and Convective Collapse: Size(flux)-Strength Distribution for the Small-Scale Solar Magnetic Flux Tubes 
    Rajaguru, S. P; Hasan, S. S (Astronomical Society of the Pacific, 1999)
    The effects of radiative energy exchange on the convective instability of a weak field magnetic structure, which lead to a prediction and a physical explanation of the magnetic flux dependent field strength, are examined ...

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