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Browsing by Subject "Pulsars"

Browsing by Subject "Pulsars"

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  • Alpha effect in partially ionized plasmas 
    Krishan, V; Gangadhara, R. T (Springer Netherlands, 2008)
    There are several astrophysical situations where one needs to study the dynamics of magnetic flux in partially ionized turbulent plasmas. In a partially ionized plasma the magnetic induction is subjected to the ambipolar ...
  • Are pulsars strange? 
    Kapoor, R. C; Shukre, C. S (Astronomical Society of India, 2001)
    Pulsar radio pulses are made up of the so called core and conal components. A remarkably precise relation for core component widths, found observationally, in effect specifies the size of the polar cap on pulsars. Inclusion ...
  • A classification scheme for pulsars 
    Kochhar, R. K (Nature Publishing Group, 1977-11)
    The implications of a pulsar classification scheme are discussed. Three types of pulsars are distinguished - Type S (S for single) from supernova explosions of single stars; type D (D for disrupted) from binaries disrupted ...
  • Constraints on dynamo action 
    Mangalam, A (Springer Netherlands, 2008)
    We discuss first geometrical constraints on dynamo action. Magnetic field decay is unavoidable under certain conditions of symmetry. These known results are encompassed by a calculation for flows described in terms of a ...
  • 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 ...
  • Distribution of bhb-stars in the cluster ω centauri and its effect on the radial change in colour and ellipticity of the cluster 
    Scaria, K. K; Bappu, M. K. V (Tira Pustaka, Jakarta, 1984)
    The authors have studied the radial change in the distribution of giant branch stars and the horizontal branch stars in ω Centauri. They show how the observed change in the distribution is related to the radial change in ...
  • Effects of spacetime curvature and rotation on arrival times of pulses from fast pulsars 
    Kapoor, R. C; Datta, B (American Astronomical Society, 1986-12)
    General relativistic effects due to spacetime curvature and rotation on the arrival times of pulsar signals are investigated using a rotationally perturbed spherical metric. It is found that for the millisecond pulsar PSR ...
  • EGRET gamma-ray sources : Observations and physics 
    Mukherjee, R (Astronomical Society of India, 2002)
    High energy astronomy above 30 MeV received a significant impetus from the observations of EGRET (Energetic Gamma-Ray Experiment Telescope) on board the Compton Gamma Ray Observatory (CGRO). Until June 2000, when CGRO was ...
  • Electromagnetic radiation in a helical magnetic field 
    Krishan, V (1984)
    Electromagnetic radiation spectrum is studied in a helical magnetic field since such magnetic field configurations may be present in cosmic objects. It is shown that, by a proper choice of the spatial period of the magnetic ...
  • Equilibrium sequences of rotating neutron stars for new realistic Equations of State 
    Datta, B; Thampan, A. V; Bombaci, I (The European Southern Observatory, 1998-06)
    For four newly suggested realistic Equations of State of neutron star matter, we construct equilibrium sequences of rapidly rotating neutron stars in general relativity. The sequences are the normal and supramassive ...
  • Extreme-energy cosmic rays: hints to new physics beyond the standard model? 
    Bhattacharjee, P; Sigl, G (Springer, 2001)
    The observed extreme energy cosmic ray (EECR) events above 10(20) eV are difficult to explain within tile standard scenario of origin of cosmic rays in which charged particles are accelerated in magnetized shocks in powerful ...
  • Faraday rotation versus stimulated Raman scattering in intense sources 
    Gangadhara, R. T; Krishan, V (Astronomical Society of India, 1993)
    A coherent plasma process such as the stimulated Raman scattering plays significant role in bringing about the changes in polarization characteristics of radiation. It is found that some of the observed polarization ...
  • Fast pulsars - Effects of spacetime curvature and rotation on the pulse characteristics 
    Kapoor, R. C; Datta, B (The American Astronomical Society, 1985-10)
    The effects of spacetime curvature and rotation on the pulse profile of fast pulsars are studied using a rotationally perturbed spherical metric and a representative choice of the equation of state for neutron star matter. ...
  • First results from the Indian x-ray astronomy satellite 
    Paul, B (Astronomical Society of India, 1999)
  • Frequency shifts and line broadening of radiation from rotating neutron stars 
    Kapoor, R. C; Datta, B (The Royal Astronomical Society, 1984-08)
    The frequency shifts and line broadening of radiation from the surface of rapidly rotating neutron stars are calculated using a rotationally perturbed interior spherical metric and a representative choice of the equation ...
  • General relativistic effects on the pulse profile of fast pulsars 
    Datta, B; Kapoor, R. C (Nature Publishing Group, 1985-06-13)
    The recent discovery of millisecond pulsars has led to several theories about the structure and radiation characteristics of rapidly rotating neutron stars. The rapid rotation rate implies that such pulsars will be compact ...
  • High Energy Gamma-Ray Pulsars 
    Ramanamurthy, P. V (Astronomical Society of India, 1997)
    To date we know the existence of six high energy gamma-ray (HEGR) pulsars and a possible seventh candidate, besides a solitary low energy gamma-ray pulsar. In this paper, we briefly summarize the observations on the seven ...
  • Hybrid viscosity and magnetoviscous instability in hot, collisionless accretion disks 
    Subramanian, P; Becker, P. A; Kafatos, M. (Springer Netherlands, 2008)
    We aim to illustrate the role of hot protons in enhancing the magnetorotational instability (MRI) via the “hybrid” viscosity, which is due to the redirection of protons interacting with static magnetic field perturbations, ...
  • Is the X-ray pulsar H 0253 + 193 a neutron star spun down in a molecular cloud? 
    Bhatt, H. C (The European Southern Observatory, 1990-06)
    The detection of 206s X-ray pulsations from H0253+193 indicates that the source is a compact object. It is argued here that object can not be a T Tauri star or Be/X –ray binary pulsar suggested that H 0253+193 is slowly ...
  • Is the X-ray pulsar H 0253 + 193 a neutron star spun down in a molecular cloud? 
    Bhatt, H. C (The European Southern Observatory, 1990-06)
    The detection of 206s X-ray pulsations from H0253+193 indicates that the source is a compact object. It is argued here that object can not be a T Tauri star or Be/X –ray binary pulsar suggested that H 0253+193 is slowly ...

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