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16 papers · 2 filters
Competing Drifting Radio Subpulses in PSR B0031-07
M. Vivekanand, B. C. Joshi
The pair of drifting subpulses of the radio pulsar PSR B0031-07 appear to be well separated from each other on the average, overlapping at less than one thirtieth of the peak energ…
High frequency and high wavenumber solar oscillations
H. M. Antia, Sarbani Basu
We determine the frequencies of solar oscillations covering a wide range of degree (100< l <4000) and frequency (1.5 <ν<10 mHz) using the ring diagram technique applied to power sp…
Long-Term Scintillation Studies of Pulsars: III. Testing Theoretical Models of Refractive Scintillation
N. D. Ramesh Bhat, A. Pramesh Rao, Yashwant Gupta
Refractive interstellar scintillation (RISS) is thought to be the cause behind a variety of phenomena seen at radio wavelengths in pulsars and compact radio sources. Though there i…
Long-Term Scintillation Studies of Pulsars: II. Refractive Effects and the Spectrum of Plasma Density Fluctuations
N. D. Ramesh Bhat, Yashwant Gupta, A. Pramesh Rao
Refractive scintillation effects are powerful techniques for discriminating between different models proposed for the electron density fluctuation spectrum in the ISM. Data from ou…
Long-Term Scintillation Studies of Pulsars: I. Observations and Basic Results
N. D. Ramesh Bhat, A. Pramesh Rao, Yashwant Gupta
We report long-term scintillation observations of 18 pulsars in the DM range 3-35 pc cm^{-3} carried out during 1993-1995 using the Ooty Radio Telescope at 327 MHz. These observati…
Ring diagram analysis of near-surface flows in the Sun
Sarbani Basu, H. M. Antia, S. C. Tripathy
Ring diagram analysis of solar oscillation power spectra obtained from MDI data is carried out to study the velocity fields in the outer part of the solar convection zone. The thre…
Viscous Stability of Relativistic Keplerian Accretion Disks
Pranab Ghosh
We investigate the viscous stability of thin, Keplerian accretion disks in regions where general relativistic (GR) effects are essential. For gas pressure dominated (GPD) disks, we…
Oscillation Effects On Neutrinos From The Early Phase Of a Nearby Supernova
Debasish Majumdar, Kamales Kar, Alak Ray +2
Neutrinos emitted during stellar core collapse leading to a supernova are primarily of the electron neutrino type at source which may undergo oscillation between flavor eigenstates…
Low-Mass X-Ray Binaries, Millisecond Radio Pulsars, and the Cosmic Star Formation Rate
Nicholas E. White, Pranab Ghosh
We report on the implications of the peak in the cosmic star-formation rate (SFR) at redshift z ~ 1.5 for the resulting population of low-mass X-ray binaries(LMXB) and for that of…
Ring diagram analysis of velocity fields within the solar convection zone
Sarbani Basu, H. M. Antia, S. C. Tripathy
Ring diagram analysis of solar oscillation power spectra obtained from MDI data is performed to study the velocity fields within the solar convection zone. The three dimensional po…
RXTE Observation of PSR B1706-44 and Implications for Theoretical Models of Pulsar Emission
A. Ray, A. K. Harding, M. S. Strickman
We report on results of an observation with the Rossi X-Ray Timing Explorer (RXTE) of PSR B1706-44 with a live time of 132 ks, to search for pulsed X-ray emission. PSR B1706-44 is…
Quasi-periodic oscillations discovered in the new X-ray pulsar XTE J1858+034
B. Paul, A. R. Rao
We report the discovery of low frequency quasi-periodic oscillations centered at 0.11 Hz in the newly discovered 221 s X-ray pulsar XTE J1858+034. Among about 30 known transient X-…
Cepheid Distance to M100 in Virgo Cluster
D. Narasimha, Anwesh Mazumdar
A measurement of the distance to Virgo Cluster by a direct method along with a realistic error analysis is important for a reliable determination of the value of Hubble Constant. C…
Some Characteristics of Galactic Cepheids Relevant to the Calibration of the Distance Scale
Anwesh Mazumdar, D. Narasimha
An analysis of the observed characteristics of the Galactic Cepheid variables is carried out in the framework of their period-luminosity relation being used as a standard candle fo…
Cerenkov Photon Density Fluctuations in Extensive Air Showers
V. R. Chitnis, P. N. Bhat
The details of Cerenkov light produced by a gamma ray or a cosmic ray incident at the top of the atmosphere is best studied through systematic simulations of the extensive air show…
Role of the scalar field in gravitational lensing
K. S. Virbhadra, D. Narasimha, S. M. Chitre
A static and circularly symmetric lens characterized by mass and scalar charge parameters is constructed. For the small values of the scalar charge to the mass ratio, the gravitati…