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Browsing by Subject "Astrophysics"

Browsing by Subject "Astrophysics"

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  • The interaction principle in radiative transfer 
    Peraiah, A (D. Reidel Publishing Co., 1984-10)
    We describe the interaction principle which is of fundamental importance to the theory of radiative transfer in one-, two-, and three-dimensional geometry. We also describe the practical difficulties associated with this ...
  • Investigating Extra-solar Planetary System Qatar-1 through Transit Observations 
    Thakur, P; Mannaday, V. K; Jiang, I; Sahu, D. K; Chand, S (Societe Royale des Sciences de Liege, 2018-04)
    We report the results of the transit timing variation (TTV) analysis of the extra-solar planet Qatar1b using thirty eight light curves. Our analysis combines thirty five previously available transit light curves with three ...
  • Kodaikanal Solar Observatory: Unravelling the mysteries of the Sun for the last 125 years 
    The Hindu (The Hindu, 2024-03-31)
  • Landau’s major contribution to physics a brief overview 
    Sivaram, C; Arun, K (South Asian Publisher, 2009-06)
    Lev Davidovich Landau was arguably one of the greatest and most versatile physicists. His work spans a very wide range and has had a considerable impact on ail areas of physics including condensed matter physics, ...
  • Large number coincidences and unification of the parameters underlying elementary particles astrophysics and cosmology 
    Sivaram, C (World Scientific, 1984)
    The Ubiquitous occurrence of the Dirac-Eddington large dimensionless numbers when relating the physical parameters such as mass, radius, angular momentum etc. of typical astrophys1cal objects like stars and galax1es to ...
  • Light Curve and Spectral Evolution of Type IIb Supernovae 
    Gangopadhyay, A; Misra, K; Pastorello, A; Sahu, D. K; Singh, M; Dastidar, R; Anapuma, G. C; Kumar, B; Pandey, S. B (Societe Royale des Sciences de Liege, 2018-04)
    Stripped-Envelope Supernovae constitute the sub-class of core-collapse supernovae that strip off their outer hydrogen envelope due to high stellar winds or due to interaction with a binary companion where mass transfer ...
  • Lunar occultation techniques in investigations of binary stars 
    Bhattacharyya, J. C (Tira Pustaka, Jakarta, 1984)
    The paper discusses the possibility of direct measurement of angular separations and luminosity ratios of components of unresolved binary systems through observations of lunar occultations. A current program at Kavalur ...
  • A model for the millisecond pulsar PSR 1937 + 214 
    Kochhar, R. K; Sivaram, C (Springer, 1984-01)
    The authors suggest a model for the millisecond pulsar PSR 1937+214, according to which the immediate progenitor of the pulsar was a binary consisting of two neutron stars of unequal mass. The heavier neutron star was spun ...
  • Multi-band optical variability studies of Blazars 
    Aditi Agarwal (Societe Royale des Sciences de Liege, 2018-04)
    To search for optical variability on a wide range of timescales, we have carried out photometric monitoring of a dozen blazars. CCD magnitudes in B, V, R and I pass-bands were determined for > 10,000 new optical observations ...
  • A near infrared polarimeter for astrophysical studies 
    Joshi, U. C; Manian, K. S. B; Chauhan, J. S; Shah, V; Chitre, A; Ganesh, S; Deshpande, M. R (Astronomical Society of India, 1997)
    A state-of the-art near infrared photo polarimeter was designed and developed at Physical Research Laboratory, Ahmedabad, India to undertake the study of star forming regions, symbiotic stars and AGB stars etc. The instrument ...
  • Neutral Currents in Astrophysics 
    Ramadurai, S (Astronomical Society of India, 1975-03)
  • Nirmala Sitharaman launches work on cosomology centre Mysuru 
    Deccan Herald (Deccan Herald, 2022-03-07)
  • On the slow-down of the millisecond pulsar PSR 1937 + 214 
    Sivaram, C; Kochhar, R. K (Springer, 1984-01)
    There are indications that less than 10/sup-3 of the spin-down energy of the millisecond pulsar PSR 1937+214 emerges as electromagnetic radiation. The implications of this result are discussed. The surface magnetic field ...
  • Optimization of existing centroiding algorithms for Shack Hartmann sensor 
    Vyas, A; Roopashree, M. B; Prasad, B. R (2009)
    Three centroiding techniques to estimate the position of the spots in a Shack Hartmann sensor: Normalized Centre of Gravity (CoG), Iteratively Weighted Centre of Gravity (IWCoG) and Intensity Weighted (IWC) centroiding are ...
  • Physics and observations of tidal disruption events 
    Mangalam, A; Mageshwaran, T (Societe Royale des Sciences de Liege, 2018-04)
    We describe a model of tidal disruption events (TDEs) with input physical parameters that include the black hole (BH) mass M•, the specific orbital energy E, the angular momentum J, the star mass M? and radius R?. We ...
  • Possible effects of positronium negative ion on 0.511 MeV gamma-ray line in astrophysical sources 
    Sivaram, C; Krishan, V (Springer, 1982-07)
    The astrophysical importance of the negative positronium ion, detected recently in the laboratory, has been pointed out. It is found that the presence of Ps(-) ions will contribute additionally to the width of the 0.511 ...
  • Present status of the 4-m ILMT data reduction pipeline: application to space debris detection and characterization 
    Pradhan, B; Delchambre, L; Akhunov, T; Hickson, P; Bartczak, P; Kumar, B; Surdej, J (Societe Royale des Sciences de Liege, 2018-04)
    The 4-m International Liquid Mirror Telescope (ILMT) located at the ARIES Observatory (Devasthal, India) has been designed to scan at a latitude of +29◦ 22’ 26” a band of sky having a width of about half a degree in the ...
  • Probing the central engine and environment of AGN using ARIES 1.3-m and 3.6-m telescopes 
    Chand, H; Rakshit, S; Jalan, P; Ojha, V; Srianand, R; Vivek, M; Mishra, S; Omar, A; Kumar, P; Joshi, R; Gopal Krishna; Kumar, R (Societe Royale des Sciences de Liege, 2018-04)
    : We discuss three long term observational programmes to probe the central engine and environment of active galactic nuclei (AGN) using the recently installed ARIES 1.3-m and 3.6-m telescopes. The first programme is on ...
  • Properties of Narrow line Seyfert 1 galaxies 
    Rakshit, S; Stalin, C. S; Chand, H; Zhang, X (Bulletin de la Societe Royale des Sciences de Liege, 2018-04)
    Narrow line Seyfert 1 (NLSy1) galaxies constitute a class of active galactic nuclei characterized by the full width at half maximum (FWHM) of the Hα broad emission line <2000 km s-1 and the flux ratio of [O III] to Hα ...
  • R Coronae Borealis at the 2003 light minimum 
    Kameswara Rao, N; Lambert, D. L; Shetrone, M. D (Blackwell Publishing, 2006-08)
    A set of five high-resolution optical spectra of R CrB obtained in 2003 March is discussed. At the time of the first spectrum (March 8), the star was at V = 12.6, a decline of more than six magnitudes. By March 31, the ...

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