Publications of Astronomical Society of India: Recent submissions

Now showing items 1021-1040 of 1868

Interstellar biomolecules and infrared astronomy

Rastogi, S (Astronomical Society of India, 1999)

The ubiquitous presence of organic molecules in the interstellar clouds, comets and asteroids, and the evidence of extraterrestrial amino acids in carbonaceous meteorites strongly support a cosmic perspective on the origin ...
Linear polarization in binaries with grey atmosphere I. Conservative Rayleigh scattering

Barman, S. K (Astronomical Society of India, 1999)

This paper presents a method for calculating linear polarization from binaries whose surfaces are distorted due to tidal and rotational forces. The atmospheres in stars are grey, plane-parallel and pure scattering. The ...
Fluctuations in Čerenkov photon density in extensive air showers

Chitnis, V. R; Bhat, P. N (Astronomical Society of India, 1999)

In the absence of a standard source of γ-rays or hadrons of known energy one has to study the details of production of Cerenkov light at the observation level only through detailed simulation studies. Recently such studies ...
New pulsar observations using the Gauribidanur Radio Telescope

Asgekar, A; Deshpande, A. A (Astronomical Society of India, 1999)

Pulsar observations with improved sensitivity have been initiated at 34.5 MHz and a 1-MHz bandwidth using the Gauribidanur Radio Telescope. We describe our new procedure where the raw (2-bit) signal voltages are recorded ...
Geometrical constriants on pulsar emission II

Kapoor, R. C; Shukre, C. S (Astronomical Society of India, 1999)
Shape of pulsar beams revisited

Mitra, D; Deshpande, A. A (Astronomical Society of India, 1999)

Using a carefully selected subset of the recently published multifrequency polarimetric observations of 301 radio pulsas (Gould & Lyne 1997), we have attempted modeling the shape of pulsar beams. From the 6-frequency data ...
Detection of 6 new 107 GHz methanol masers

Ramesh, B (Astronomical Society of India, 1999)
Hint of a galactic origin for a sub-population of extremely short and hard cosmic gamma-ray bursts

Shanthi, K; Rao, A. R; Bhat, C. L; Vahia, M. N (Astronomical Society of India, 1999)

Gamma Ray Bursts (GRBs) belong to an exotic class of astronomical phenomena whose origin and nature continues to puzzle the astrophysical community. These enigmatic events are seen as intense outbursts of high-energy photon ...
Millisecond pulsars as VHE gamma-ray sources

Kaul, R. K; Kaul, C. L; Bhat, C. L (Astronomical Society of India, 1999)

The detectability of millisecond pulsars in VHE gamma-ray bracket (>5x10 to the power 11 eV), with the recently-commissioned TACTIC array, has been investigated on the basis of system energetics and the pulsar polar gap ...
Gamma ray production in SNR's -contribution from photomeson process

Bhattacharya, S; Kaul, R. K; Kaul, C. L; Bhat, C. L (Astronomical Society of India, 1999)

We estimate the integral γ-ray fluxes above 10 MeV photon energy, likely to result from neutral pion decay, following photomeson interactions between ultra-high energy protons accelerated in Supernova Remnants (SNR) and ...
Comparison of perodicities of the sun's 'mean' and differential rotations determined from sunspot groups and from Mt. Wilson velocity data.

Javaraiah, J (Astronomical Society of India, 1999)
Energy dependence of x-ray pulse profile of the crab pulsar

Mukerjee, K; Agrawal, P. C; Paul, B; Rao, A. R; Vahia, M. N; Yadav, J. S; Seetha, S; Kasturirangan, K (Astronomical Society of India, 1999)

We obtained pulse profiles of Crab pulsar in 4 different X-ray energy bands between 2 and 30 keV. We found that all the profiles in these energy ranges show two peaks occurring at the same phase joined by a lower but non ...
X-ray bursts from GRS 1915+105 observed with IXAE

Yadav, J. S; Agrawal, P. C; Paul, B; Rao, A. R; Vahia, M. N; Seetha, S; Kasturirangan, K (Astronomical Society of India, 1999)

The light curves of the galactic superluminal X-ray transient source GRS1915+105 observed with the pointed proportional counters (PPC) of Indian X-ray Astronomy Experiment (IXAE)on board IRS-P3 have revealed the presence ...
A spatio-kinematic study of the planetary nebula NGC 246 in the [OIII] 5007 Å line

Muthumariappan, C; Anandarao, B. G (Astronomical Society of India, 1999)
Possible trends in expansion velocities of planetary nebulae evolved from common envelope binary systems

Muthumariappan, C; Anandarao, B. G (Astronomical Society of India, 1999)
Infrared spectral energy distribution of four star forming regions

Karnik, A. D; Ghosh, S. K; Rengarajan, T. N; Tandon, S. N; Verma, R. P (Astronomical Society of India, 1999)

Star forming regions associated with IRAS 19181+1349, 20255+3712, 20178+4046 and 10049+5657 have been mapped simultaneously in two far infrared bands (λeff ~ 130 and 210 µm), using TIFR 1m balloon borne telescope with ...
Modelling infrared spectra of a few compact HII regions

Ghosh, S. K; Verma, R. P (Astronomical Society of India, 1999)

The observed near infrared to sub-mm spectra of five compact HII regions, viz., IRAS 18116-1646, 18162-2048, 19422+2427, 22308+5812 and 18434-0242, consisting of the continuum as well as several features, have been explained ...
Mid-infrared observations of three compact HII regions and PAH emission

Verma, R. P; Ghosh, S. K; Karnik, A. D; Mookerjea, B; Rengarajan, T. N (Astronomical Society of India, 1999)
Infrared emission from IRAS 00338+6312

Mookerjea, B; Ghosh, S. K; Karnik, A. D; Rengarajan, T. N; Tandon, S. N; Verma, R. P (Astronomical Society of India, 1999)

The Galactic star forming region associated with IRAS 00338+6312 has been mapped in 2 Far Infrared (FIR) bands centered around 140 & 185 μm, using the TIFR 100 cm balloon-borne telescope with liquid 3/sup He cooled bolometer ...
Infrared spectroscopic diagnostics for initial mass function

Ghosh, S. K; Mookerjea, B (Astronomical Society of India, 1999)

The diagnostic values of various atomic/ nebular infrared spectral lines of relatively abundant elements (in different ionization states) in Galactic star forming regions, have been studied quantitatively. The code CLOUDY ...

Now showing items 1021-1040 of 1868

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