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  • Speckle interferometry technique for astronomical observations 
    Saha, S. K (The Optical Society of India, 2003)
  • Spectra of doubly and trebly ionised thallium 
    Narayan, A. L; Pattabhi, P; Rao, A. S (Nature Publishing Group, 1929-09-20)
    CONTINUING our previous work on Tl II and Pb III, the spectra of Tl III and Tl IV have been under examination by us for some time past. A preliminary attempt, by the application of the X-ray doublet-laws, revealed a number ...
  • Spectra of two recent supernovae 
    Prabhu, T. P (Astronomical Society of India, 1981-03)
    Preliminary results on the spectroscopy of two recent supernovae are presented. The spectrograms obtained at a dispersion of 400 Armstrong m/m in the wavelength range of 4300-8700 Armstrong show that the supernova in NGC ...
  • The spectra of Wolf-Rayet stars at high dispersion 
    Bappu, M. K. V (D. Reidel Publishing, 1973)
  • Spectral ageing analysis and dynamical analysis of the double-double radio galaxy J1548–3216 
    Machalski, J; Jamrozy, M; Konar, C (EDP Sciences, 2010-02)
    Context. Determining ages of the outer and the inner lobes of so-called double-double radio galaxies (DDRGs) is crucial for understanding the active cycles of galactic nuclei, the phases of interruption of the jet flow, ...
  • A Spectral Analysis of HD 165553 
    Goswami, A; Kameswara Rao, N; Lambert, D. L (Astronomical Society of India, 2003)
    High resolution spectra of HD 165553, a star reported to be a spectroscopic binary of spectral type F8 Ib are analysed. The stellar parameters - effective temperature, surface gravity and microturbulence are determined ...
  • Spectral Analysis of Selected Cepheids and the Galactic Distribution of Metalicity 
    Giridhar, S (Indian Institute of Astrophysics, Bangalore, 1982-10)
  • Spectral Analysis of Solar Radio Type III Bursts from 20 kHz to 410 MHz 
    Sasikumar Raja, K; Maksimovic, Milan; Kontar, Eduard P; Bonnin, Xavier; Zarka, Philippe; Lamy, Laurent; Reid, Hamish; Vilmer, Nicole; Lecacheux, Alain; Krupar, Vratislav (IOP Publishing, 2022-01-10)
    We present the statistical analysis of the spectral response of solar radio type III bursts over the wide frequency range between 20 kHz and 410 MHz. For this purpose, we have used observations that were carried out using ...
  • Spectral and temporal studies of Swift J1658.2–4242 using AstroSat observations with the JeTCAF model 
    Mondal, Santanu; Jithesh, V (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    We present the X-ray spectral and temporal analysis of the black hole X-ray transient Swift J1658.2–4242 observed by AstroSat. Three epochs of data have been analysed using the JeTCAF model to estimate the mass accretion ...
  • Spectral and time series analyses of the seyfert 1 AGN: Zw 229.015 
    Adegoke, Oluwashina; Rakshit, S; Mukhopadhyay, B (Oxford University Press on behalf of the Royal Astronomical Society, 2017-05)
    We analyse the spectra of the archival XMM–Newton data of the Seyfert 1 AGN Zw 229.015 in the energy range 0.3–10.0 keV. When fitted with a simple power law, the spectrum shows signatures of weak soft excess below 1.0 keV. ...
  • The spectral behaviour of A-type metallic line spectroscopic binary 41 Sex A 
    Sreedhar Rao, S; Abhyankar, K. D; Nagar, P (Astronomical Society of India, 1990)
  • Spectral characteristics of a solar flare from ionospheric data 
    Bhattacharyya, J. C; Balakrishnan, T. K (Pergamon Press Ltd, 1967)
    From the height variation of electron densities during a solar flare, ultra violet and X-ray contribution of ionization process has been estimated. The results thus obtained are in conformity with direct measurements of ...
  • Spectral classification at ultra-low dispersion 
    Rajamohan, R (D. Reidel Publishing Co., 1984-11)
    The accuracy of the ultralow-dispersion slitless-spectroscopy technique of Bappu and Parthasarathy (1977) in classifying early-type stars at great distances from the sun is investigated experimentally using a 5-min exposure ...
  • Spectral classification of unidentified IRAS sources with F{_nu }(12 μm) >= F{_nu }(25 μm) 
    Iyengar, K. V. K; MacConnell, D. J (The European Southern Observatory, 1998-12)
    Spectral types of a large number of unidentified IRAS Point Sources with F{_nu }(12 μm) >= F{_nu }(25 μm) were determined; the majority are faint, oxygen-rich (M-type) or carbon-rich giant stars. The Guide Star Catalog has ...
  • Spectral Classification: Old and Contemporary 
    Giridhar, S (Springer, 2010)
    Beginning with a historical account of the spectral classification, its refinement through additional criteria is presented. The line strengths and ratios used in two dimensional classifications of each spectral class are ...
  • Spectral energy distributions and age estimates of 40 massive young stellar objects 
    Tanti, K. K; Jayashree Roy; Duorah, K (Kyivskyi Universytet, 2012-11)
    In this paper, we present the spectral energy distributions (SEDs) of 40 massive young stellar objects (YSOs), detected from the NIR imaging survey carried out by Varricatt et al. 2010 and estimated their ages and masses. ...
  • Spectral evolution of LMXB GX 349+2 
    Agrawal, V; Sreekumar, P (Astronomical Society of India, 2002-09)
    Z sources are the brightest low-mass X-ray binaries (LMXB) believed to contain magnetized neutron stars. They trace a '2' shaped track in theil X-ray colour-colour diagram. It is thought that the accretion rate increases ...
  • Spectral evolution of nova V443 Scuti 1989 
    Anupama, G. C; Duerbeck, H. W; Prabhu, T. P; Jain, S. K (European Southern Observatory, 1992-09)
    Spectroscopy of the moderately fast nova V443 is presented. Observations were made during the brightness fluctuations following maximum and during the transition stage. A few broadband polarimetric observations are also ...
  • Spectral index variation across X-shaped radio galaxies 
    Patra, Dusmanta; Joshi, Ravi; Gopal-Krishna (Oxford University Press on behalf of Royal Astronomical Society, 2023-09)
    The formation mechanism of the enigmatic subclass of radio galaxies, called ‘X-shaped radio galaxies’ (XRGs), or ‘winged’ radio galaxies, which account for ∼10 per cent of the radio galaxy population, can be effectively ...
  • Spectral Indices and Particle Aging Studies on the Giant Radio Galaxy NGC6251 
    Mack, K. H; Klein, U; Saripalli, L; Willis, A. G; O'Dea, C. P (International Astronomical Union, 1996)

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