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Browsing Publications of Astronomical Society of India by Title

Browsing Publications of Astronomical Society of India by Title

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  • Spectroscopic survey of field stars : A search for metal-poor stars 
    Giridhar, S; Goswami, A (Astronomical Society of India, 2002)
    We have undertaken a spectroscopic survey of field stars to fine metal-poor objects among them. Though the main objective of the survey is to find new metal-poor stars, stellar parameterization is carried out for all the ...
  • Spectroscopy of IRAS sources with far IR colors similar to those of planetary nebulae 
    Reddy, B. E; Parthasarathy, M (Astronomical Society of India, 1993)
    Optical candidates of 17 unidentified IRAS sources with far-infrared colors similar to planetary nebulae have been detected on sky survey plates. Low resolution CCD spectra of seven optical candidates suggests that they ...
  • Spectroscopy of novae and supernovae 
    Prabhu, T. P (Astronomical Society of India, 1993)
    Many novae have been studied spectroscopically since 1975 and many supernovae since 1980 using the telescopes at Vainu Bappu Observatory (VBO). The program on novae has intensified since 1985, and that on supernovae has ...
  • Spectroscopy of Seyferts in the Far-UV 
    Shastri, P; Murthy, J; Hutchings, J (Astronomical Society of India, 2003)
    We present our preliminary far-ultraviolet spectra of the Seyfert Mrk 533 obtained with FUSE. These are among the first FUV spectra of a purportedly edge-on Seyfert, and show narrow OVI emission as well as some evidence ...
  • Spectroscopy of supernovae 
    Anupama, G. C (Astronomical Society of India, 2000)
  • Spectrum of SN 1983n in NGC 5236 at maximum light 
    Prabhu, T. P (Astronomical Society of India, 1985-03)
    The spectrum of SN 1983n in NGC 5236 (M83) obtained at its light maximum is presented. The spectrogram was digitized and smoothed using optimal filter technique in Fourier space. The moonlight background was subtracted ...
  • Spectrum of the recent supernova in NGC 4753 
    Prabhu, T. P (Astronomical Society of India, 1983-09)
    Low-resolution spectrograms of SN 1983 in the IO galaxy NGC 4753, obtained with the 102-cm Kavalur reflector, show it to be a typical type I supernova. The spectrum suggests that the supernova was about 20 days past maximum ...
  • Spot and filament rotation in a sigmoidal flare 
    Sundararaman, K; Ramesh, K. B; Selvendran, R (Astronomical Society of India, 2001)
    The role played by the rotation of the umbrae in a sunspot with respect to the H? filament in inducing magnetic shear for the sigmoidal brightening is reported in this paper. We carried out these studies by using photoheliogram ...
  • SPOT Modelling in the Rs-Canum System Wy-Cancri 
    Vivekananda Rao, P; Sarma, M. B. K (Astronomical Society of India, 1990)
  • Spot size of 17m-diameter MACE reflector in presence of surface inaccuracies 
    Koul, D. K; Koul, M. K; Tickoo, A. K; Bhat, C. L (Astronomical Society of India, 2002)
    The MACE (for Major Atmospheric Cerenkov Experiment), an imaging cerenkov telescope for gamma-ray astronomy investigations in the sub-TeV energy bracket, plans to use a 17 m-diameter high quality reflecter mounted with a ...
  • Stability of collinear equilibrium points in the generalised photogravitational elliptic restricted three-body problem 
    Sahoo, S. K; Ishwar, B (Astronomical Society of India, 2000)
    We have examined stability of collinear equilibrium points in the generalised photogravitational elliptic restricted three body problem. The problem is generalised in the sense that the smaller primary is considered as an ...
  • 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 ...
  • Star formation : circumstellar environment around Young Stellar Objects 
    Manoj, P (Astronomical Society of India, 2005-09)
    In this thesis we have undertaken a detailed study of the evolution of young circumstellar disks from the early pre-main sequence phase to the main sequence phase. We have used several observational diagnostics of the disks ...
  • Star formation in giant extragalactic H II regions 
    Mayya, Y. D (Astronomical Society of India, 1993)
    Star formation properties in Giant Extragalactic H II Regions (GE-Hrs) are investigated using the optical photometry and evolutionary population synthesis models. We find it necessary to have differential extinction between ...
  • Star formation in molecular clouds and the initial mass function : A new model 
    Bhatt, H. C (Astronomical Society of India, 1999)
    The observed mass spectra for stars and interstellar clouds are discussed. Stars are born from clouds, but their mass spectra are fundamentally different. A new model is proposed in which the Salpeter function representing ...
  • Star formation in the region of young open cluster - NGC 225 
    Subramaniam, A; Mathew, B; Sreeja S. K (Astronomical Society of India, 2006-12)
    NGC 225 is believed to be a 120 Myr old open cluster located at tilda 650 pc. Eight stars with H alphaemission are found to be located around the cluster, of which two are probable Herbig Be stars, indicating a very young ...
  • Star formation studies at TIFR 
    Ghosh, S. K (Astronomical Society of India, 2005-06)
    Studies of Galactic star forming regions being carried out at TIFR, is summarized. The techniques and typical results from these studies have been described brie y, which include: the balloon borne far infrared mapping in ...
  • Starburst galaxies -- AGN connection: Theoretical scenario 
    Jog, Chanda J (Astronomical Society of India, 1993)
    Starburst galaxies are characterized by a very high central infrared luminosity of about 10/sup10/ - 10/sup12/ solar luminosity. This luminosity is attributed to a burst of formation of massive stars. The stellar radiation ...
  • Starbursts triggered by central overpressure in interacting galaxies 
    Mousumi Das; Jog, C. J (Astronomical Society of India, 1993)
    We present a triggering mechanism for starbursts in the central regions of interacting galaxies. As a disk giant molecular cloud (GMC) falls into the central region of a galaxy following a galaxy encounter, it may be ...
  • A Statistical Study of 3EG Source Characteristics 
    Sharma, M; Kaul, R. K (Astronomical Society of India, 2003)
    A detailed statistical study of 3EG source characteristics and their variation as a function of galactic latitude shows that a majority of Unidentified sources at mid galactic latutudes are so-far undetected AGN.

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