Publications of Astronomical Society of India: Recent submissions

  • Convective overshooting in stellar interiors 
    Singh, H. P; Roxburgh, I. W; Chan, K. L (Astronomical Society of India, 2000)
    The region of turbulent convective motions in stellar envelopes provides for both energy transport and the redistribution of chemical elements by mixing processes. Penetration or overshooting of these convective motions ...
  • Rotation rate and flows in the solar interior 
    Antia, H. M (Astronomical Society of India, 2000)
    The rotation rate in the solar interior can be inferred from measured splittings of solar oscillation frequencies using various inversion techniques. While other large scale flows can be studied using local techniques, ...
  • Helioseismology and solar neutrinos 
    Chitre, S. M (Astronomical Society of India, 2000)
  • The seismic sun 
    Basu, S (Astronomical Society of India, 2000)
    The "Seismic Sun" is a model of the Sun constructed using helioseismological deductions about the Sun. The seismic Sun is very similar to a standard solar model which incorporates gravitational settling of helium and heavy ...
  • Distribution of stellar mass in young star clusters of our Galaxy and nearby galaxies 
    Sagar, R (Astronomical Society of India, 2000)
    Stellar mass distribution in young star clusters of our Galaxy, the Magellanic Clouds and the nearby local groups of galaxies has been used to investigate the universality of initial mass function and presence of mass ...
  • On the formation of a helmet streamer on January 24, 1992 at the south-west limb 
    Singh, J; Sakurai, T; Ichimoto, K; Hiei, E (Astronomical Society of India, 2000)
    We have analysed the soft X-ray images of the sun obtained with the YOHKOH satellite, white light coronal images observed at Mauna Loa and H-alpha pictures of the sun taken at Mitaka and Kodaikanal to study helmet streamers. ...
  • Temporal behaviour of emissions from gamma-ray bursts and optical/near-IR afterglows of GRB 991208 and GRB 991216 
    Sagar, R; Mohan, V; Pandey, A. K; Pandey, S. B; Castro-Tirado, A. J (Astronomical Society of India, 2000)
    The CCD magnitudes in Cousins R and I photometric passbands are determined for GRB 991216 and GRB 991208 afterglows respectively ~ 1 and ~ 3 day after trigger of the corresponding gamma-ray bursts. Light curves of the ...
  • Constraints on the photon mass and charge and test of equivalence principle from GRB 990123 
    Sivaram, C (Astronomical Society of India, 1999)
    Constraints on the mass and charge of a photon as well as on the parameters relevant to quantum gravity theories are put based on arrival times of radiation at different wavelengths from GRB 990123.
  • Site characterisation for the IUCAA telescope 
    Das, H. K; Menon, S. M; Paranjpye, A; Tandon, S. N (Astronomical Society of India, 1999)
    We present the report on characterisation of the site for IUCAA telescope, which was conducted during October '96 to April '97. The main points highlighted are the results on : seeing, contribution of atmospheric turbulence ...
  • Atmospheric extinction at Devasthal, Naini Tal 
    Mohan, V; Uddin, W; Sagar, R; Gupta, S. K (Astronomical Society of India, 1999)
    The atmospheric extinction coefficients in Johnson U, B, V, R and I photometric passbands are determined for the first time at Devasthal, Naini Tal during 1998 and 1999. A solid state stellar photometer mounted on a 52-cm ...
  • Infrared diagnostics for compact HII regions- II 
    Mookerjea, B; Ghosh, S. K (Astronomical Society of India, 1999)
    Compact H II regions have been realistically modelled to identify the wavelength regime and type of observables, which are crucial for understanding the physical conditions of the same. Spherically symmetric interstellar ...
  • Infrared diagnostics for compact HII regions- I 
    Mookerjea, B; Ghosh, S. K (Astronomical Society of India, 1999)
    Compact H II regions have been modelled realistically covering multidimensional parameter space in an effort to develop diagnostic tools. These models consist of embedded exciting ZAMS stars with a spherical cloud of dust ...
  • White dwarfs in the 1990's 
    Trimble, V (Astronomical Society of India, 1999)
    White dwarfs are the last evolutionary phase in the lives of stars that begin with up to about eight times the mass of our sun (8M). Their unique property is that the force of gravity is balance not by ordinary gas pressure ...
  • Emerging trends of optical interferometry in astronomy 
    Saha, S. K (Astronomical Society of India, 1999)
    The current status of the high spatial resolution imaging interferometry in optical astronomy is reviewed in the light of theoretical explanation, as well as of experimental constraints that exist in the present day ...
  • FLAGS - A Fibre Linked Astronomical Grating Spectrograph 
    Banerjee, D. P. K; Rawat, S. D; Pathan, F. M; Anandarao, B. G (Astronomical Society of India, 1999)
    The design and construction of a fibre - linked grating spectrograph, developed for astronomical studies, is described here. The spectrograph has a resolving power of about 10,000 over the visible region (4000 - 7000 ...
  • Stability of triangular points in the generalised photogravitational restricted three body problem 
    Singh, J; Ishwar, B (Astronomical Society of India, 1999)
    We study the effect of oblateness and radiation pressure forces of the primaries on the location and the stability of the triagular points in the restricted three body problem. We observe that the equations of motion and ...
  • Dynamical properties of quiescent prominence in He D3 5876 Angstrom line emission 
    Prasad, C. D; Ambastha, A; Mathew, S. K (Astronomical Society of India, 1999)
    We have observed a quiescent prominence with the Coude spectrograph of Udaipur Solar Observatory during May 24-25, 1995. Analysis of two dimenstional spectroscopic data was carried out in order to obtain the line shifts ...
  • BVRI CCD photometric standards in the field of GRB 990123 
    Nilakshi; Yadav, R. K. S; Mohan, V; Pandey, A. K; Sagar, R (Astronomical Society of India, 1999)
    The CCD magnitudes in Johnson BV and Cousins RI photometric passbands are determined for 18 stars in the field of GRB 990123. These mesurements can be used in carrying out precise CCD photometry of the optical transient ...
  • Generation of kinetic helicity from irrotational motions 
    Krishan, V; Chitre, S. M (Astronomical Society of India, 1999)
    Vortical and helical fluctuations are an integral part of any turbulent fluid. A turbulent magnetohydrodynamic system with net kinetic helicity is known to support the growth of a large scale magnetic field through the ...
  • Evershed velocities in bipolar sunspots 
    Sundararaman, K; Aleem, P. S. M; Thiagarajan, R (Astronomical Society of India, 1999)
    Spectra taken at the solar telescope-spectrograph, Kodaikanal, are analysed to find the sight-line velocity values in the regions between the opposite polarity sunspots. Velocities in opposite directions in the range 1 - ...

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