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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • The contribution of light bending and redshift to the pulse characteristics of a pulsar in the case of smaller neutron stars 
    Kapoor, R. C (The American Astronomical Society, 1991-09)
    The effect of light bending and redshift on pulsar beam characteristics is estimated using the weak form of the Kerr metric applicable to a slow-rotating neutron star. The beam is found to diverge by a factor of 2 or less ...
  • Contribution of polarons and bipolarons to low-temperature conductivity in doped polypyrrole 
    Reghu, M; Subramanyam, S. V; Chatterjee, S (American Physical Society, 1991-02)
    The resistivity of polypyrrole films, from 300 to 1.3 K, doped with ClO4 ions at various concentrations to have a different number of polarons and bipolarons, can be better fitted by T-1/3 than T-1/4. The conduction process ...
  • Contribution of Proton Capture Reactions to the Ascertained Abundance of Fluorine in the Evolved Stars of Globular Cluster M4, M22, 47 Tuc and NGC 6397 
    Mahanta, Upakul; Goswami, A; Duorah, H. L; Duorah, K (Indian Academy of Sciences, 2017-12)
    The origin of the abundance pattern and also the (anti)correlation present among the elements found in stars of globular clusters (GCs) remains unimproved until date. The proton-capture reactions are presently recognised ...
  • Contribution of relativistic quantum chemistry to electrons electric dipole moment for CP violation 
    Abe, M; Gopakumar, G; Das, B. P; Tatewaki, H; Mukherjee, D; Hada, M (AIP Publishing, 2015-05)
    The search for the electric dipole moment of the electron (eEDM) is important because it is a probe of Charge Conjugation-Parity (CP) violation. It can also shed light on new physics beyond the standard model. It is not ...
  • Convection and the Phenomenon of Kilogauss Magnetic Fields on the Sun 
    Venkatakrishnan, P (Indian Institute of Astrophysics, Bangalore, 1984)
    The role played by convection in the formation of slender magnetic flux tubes and in the dynamics of the gas within the tube is discussed in the case of simplified models. Convection instability cannot drive systematic ...
  • Convective collapse and overstable oscillations in solar flux tubes 
    Hasan, S. S (European Space Egency, 1984-11)
    The collapse of solar flux tubes by a convective instability is investigated. At the initial epoch it is assumed that the flux tube is in hydrostatic equilibrium and that it has the same temperature as the ambient medium. ...
  • Convective Intensification of Magnetic Flux Tubes in Stellar Photospheres 
    Rajaguru, S. P; Kurucz, R. L; Hasan, S. S (The American Astronomical Society, 2002-02)
    The convective collapse of thin magnetic flux tubes in the photospheres of Sun-like stars is investigated using realistic models of the superadiabatic upper convection zone layers of these stars. The strengths of convectively ...
  • Conversion of Neutron Stars to Strange Stars as the Central Engine of Gamma-Ray Bursts 
    Bombaci, I; Datta, B (The American Astronomical Society, 2000-02)
    We study the conversion of a neutron star to a strange star as a possible energy source for gamma-ray bursts. We use different recent models for the equation of state of neutron star matter and strange quark matter. We ...
  • Cool star flux spectra for population studies in galaxies 
    Malagnini, M. L; Morossi, C; Buser, R; Parthasarathy, M (EDP Sciences, 1992-08)
    Five solar-composition cool giant stars have been observed with the IUE low resolution mode. The UV energy distributions were merged with visual spectrophotometry from the literature and compared with predictions from two ...
  • Cooler and Hotter X-ray Bright Points from Hinode/XRT Observations 
    Kariyappa, R; DeLuca, E. E; Saar, S. H; Golub, L; Dame, L; Varghese, B. A (Astronomical Society of the Pacific, 2012-08)
    We use a 7-hour (17:00 UT - 24:00 UT) time sequence of soft X-ray images observed almost simultaneously in two filters (Ti_poly and Al_mesh) on April 14, 2007 with X-Ray Telescope (XRT) on-board the Hinode mission to ...
  • Cooling Process of White Dwarf Stars in Palatini f(R) Gravity 
    Kalita, Surajit; Sarmah, Lupamudra; Wojnar, Aneta (Multidisciplinary Digital Publishing Institute, 2022-12)
    A simple cooling model of white dwarf stars is re-analyzed in Palatini 𝑓(𝑅) gravity. Modified gravity affects the white dwarf structures and consequently their ages. We find that the resulting super-Chandrasekhar white ...
  • Copyright Ownership to Historical Contents in the Open Access Repository (OAR) – Case Study of Indian Institute of Astrophysics (IIA) Repository 
    Vagiswari, A; Birdie, C (DRTC, Indian Statistical Institute, Bangalore, 2007-02)
    In this paper we discuss the various steps followed while creating an open access repository of historical material available at the Indian Institute of Astrophysics using DSpace. While uploading these materials we have ...
  • Core effects on ionization potentials in thallium 
    Merlitz, H; Gopakumar, G; Chaudhuri, R. K; Das, B. P; Mahapatra, U. S; Mukherjee, D (The American Physical Society, 2001-02)
    Ionization potentials (IP's) are evaluated for various excited states of Tl using the relativistic coupled cluster (CCCD) theory in the even-parity pair channel approximation (CCSD-EPC). An average accuracy below half a ...
  • Core orientations and magnetic fields in isolated molecular clouds 
    Sharma, Ekta; Maheswar, G; Archana Soam; Lee, Chang Won; Seshadri, T. R (Oxford University Press on behalf of Royal Astronomical Society, 2022-11)
    Molecular clouds are sites of star formation. Magnetic fields are believed to play an important role in their dynamics and shaping morphology. We aim to study any possible correlation that might exist between the magnetic ...
  • Core polarization in coupled-cluster theory induced by a parity and time-reversal violating interaction 
    Latha, K. V. P; Angom, D; Chaudhuri, R. K; Das, B. P; Mukherjee, D (Institute of Physics, 2008-01)
    The effects of a parity and time-reversal violating potential, in particular the tensor–pseudotensor electron–nucleus interaction, are studied. We establish that selected terms representing the interplay of these effects ...
  • Core shift effect in blazars 
    Agarwal, A; Mohan, P; Gupta, A. C; Mangalam, A; Volvach, A. E; Aller, M. F; Aller, H. D; Gu, M. F; Lahteenmaki, A; Tornikoski, M; Volvach, L. N (Oxford University Press on behalf of the Royal Astronomical Society, 2017-07)
    We studied the pc-scale core shift effect using radio light curves for three blazars, S5 0716+714, 3C 279 and BL Lacertae, which were monitored at five frequencies (ν) between 4.8 and 36.8 GHz using the University of ...
  • Core-collapse SNe of type IIP and their progenitors: The case study of PNV J01315945+3328458 
    Dastidar, R; Kumar, B; Sahu, D. K; Misra, K; Singh, M; Gangopadhyay, A; Anapuma, G. C; Pandey, S. B (Societe Royale des Sciences de Liege, 2018-04)
    The type II supernovae (SNe) are hydrogen-rich cosmic explosions resulting from the collapse of massive stars. The impetus of studying individual events arises from its cosmological importance and the diverse understanding ...
  • Coronal heating and chromospheric energy density: An observational association 
    Venkatakrishnan, P (Springer, 1993-12)
    The time-averaged equivalent width of the He 1 10830 Angstrom line is seen to be correlated with the time-averaged line width. This correlation is interpreted as evidence for the association of the chromospheric energy ...
  • Coronal heating by magnetic kink waves 
    Banerjee, D; Dikpati, M; Choudhuri, A. R (Astronomical Society of the Pacific, 1998)
    We show that the magnetic kink waves generated by the motions of the Photospheric footpoints of the coronal flux tubes can supply adequate energy for heating the quiet corona. We model the solar corona as two-layer isothermal ...
  • Coronal Heating Experiments of the Williams College Group at Mukandgarh Fort, Rajasthan 
    Pasachoff, J. M; Babcock, B. A; Sebastian Diaz; Reardon, K. P; Kutner, E. R (Indian Institute of Astrophysics, Bangalore, 1997)
    We report on the Williams College expedition to Mukandgarh Fort, Rajasthan, for the total solar eclipse of 24 October 1995. The main experiments were a search for 1 Hz oscillations in coronal loops as an indication of ...

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