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Browsing by Author "Surendiranath, R"

Browsing by Author "Surendiranath, R"

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  • Abundances in planetary nebulae: Hb 5 
    Pottasch, S. R; Surendiranath, R (EDP Sciences, 2007-01)
    The ISO spectra of the bilobal planetary nebula Hb 5 are presented. These spectra are combined with the spectra in the visual wavelength region to obtain a complete, extinction corrected, spectrum. The chemical composition ...
  • Abundances in planetary nebulae: Me 2-1 
    Surendiranath, R; Pottasch, S. R; García-Lario, P (EDP Sciences, 2004-07)
    ISO and IUE spectra of the round planetary nebula Me 2-1 are combined with visual spectra taken from the literature to obtain for the first time a complete extinction-corrected spectrum. With this, the physico-chemical ...
  • Abundances in planetary nebulae: Mz 3 
    Pottasch, S. R; Surendiranath, R (EDP Sciences, 2005-12)
    ISO spectra of the bipolar planetary nebula Mz 3 are used to determine the element abundances in the bright lobes of the nebula. The ISO spectra alone are sufficient to determine nitrogen, neon, argon, sulfur and iron ...
  • Abundances in planetary nebulae: NGC 2792 
    Pottasch, S. R; Surendiranath, R; Bernard-Salas, J; Roellig, T. L (EDP Sciences, 2009-07)
    The mid-infrared spectrum of the rather circular planetary nebula NGC 2792 taken with the Spitzer Space Telescope is presented. This spectrum is combined with the ultraviolet IUE spectrum and with the spectrum in the ...
  • Abundances in planetary nebulae: NGC 6826 
    Surendiranath, R; Pottasch, S. R (EDP Sciences, 2008-05)
    Aims. We determine the chemical abundances and other parameters of the nebula NGC 6826 and its central star. Methods. We present new ISO spectra and combine them with archival IUE and optical spectra from the literature ...
  • Abundances in planetary nebulae: NGC 6886 
    Pottasch, S. R; Surendiranath, R (EDP Sciences, 2005-03)
    ISO and IUE spectra of the round-shaped planetary nebula NGC 6886 are combined with spectra in the visual wavelength region taken from the literature to obtain a complete, extinction corrected spectrum from ultraviolet to ...
  • Abundances in planetary nebulae: NGC 1535, NGC 6629, He2-108, and Tc1 
    Pottasch, S. R; Surendiranath, R; Bernard-Salas, J (EDP Sciences, 2011-07)
    Context. Models have been made of stars of a given mass that produce planetary nebulae that usually begin on the AGB (although they may begin earlier) and run to the white dwarf stage. While these models cover the so-called ...
  • CCD photometry in VRI bands of the galactic cluster NGC 2818 
    Surendiranath, R; Kameswara Rao, N; Sagar, R; Nathan, J. S; Ghosh, K. K (Indian Academy of Sciences, 1990-06)
    The open cluster NGC 2818 containing a planetary nebula has been observed in VRI bands using the CCD system at prime focus of the 2.3 meter Vainu Bappu Telescope. The study extending to stars V of 21 magnitude established ...
  • Deconstructing IRAS 07027-7934 
    Surendiranath, R (EDP Sciences, 2002-08)
    The planetary nebula IRAS 07027-7934 has a compact ionized core surrounded by a large cloud of matter believed to be of neutral gas and dust particles. A photoionization model of this ionized core is presented in this ...
  • M418: the low excitation PN around a WC1L star 
    Surendiranath, R; Kameswara Rao, N (International Astronomical Union, 1993)
  • OMR spectrograph at Vainu Bappu Telescope, Kavalur 
    Prabhu, T. P; Anupama, G. C; Surendiranath, R (Astronomical Society of India, 1998)
  • Personal - Computer based spectrum scanner 
    Srinivasan, R; Surendiranath, R (Council of Scientific and Industrial Research, 1991-04)
    The advent of personal computers (PC) has resulted in flexible and low cost solution for the control and acquisition of data from spectrum scanner used with optical telescopes. The PC enables user- friendly dialogue for ...
  • A photoionization model of the nebula around the WC11 star M4-18 
    Surendiranath, R; Kameswara Rao, N (Blackwell Publishing, 1995-08)
    A photoionization code has been developed incorporating provision for the presence of dust mixed with gas. M4-18 has been modelled utilizing optical CCD spectra and other observations ranging from UV to radio wavelengths. ...
  • Preliminary analysis of the broad he i emission lines in R CrB 
    Surendiranath, R; Rangarajan, K. E; Kameswara Rao, N (D. Reidel Publishing Co, 1986)
  • Profile fitting by marquardt algorithm 
    Surendiranath, R (Tata Institute of Fundamental Research, 1988)
    Many of the stellar and nebular spectroscopic problems need the inputs of the line flux (or equivalent width if the line is in absorption) and the wavelength of the line peak. These input parameters are then used in the ...
  • Radiative Transfer Models of Dust Shells Around Post-AGB Stars 
    Surendiranath, R; Parthasarathy, M; Varghese, B. A (Springer, 2002-09)
    We present a radiative transfer analysis of circumstellar dust shells around the Post-AGB stars HD 179821, HD 56126, HD 101584 and early R star HD 100764, using the code DUSTY. Parameters like mass-loss, shell inner radius, ...
  • SN 1993J in M 81: Optical photometry and spectrophotometry during the first two months 
    Prabhu, T. P; Mayya, Y. D; Singh, K. P; Kameswara Rao, N; Ghosh, K. K; Mekkaden, M. V; Pati, A. K; Raveendran, A. V; Reddy, B. E; Sagar, R; Subramaniam, A; Surendiranath, R (The European Southern Observatory, 1995-03)
    CCD photometric and spectrophotometric data on the type IIb supernova 1993J in M 81 (NGC 3031) obtained from Vainu Bappu Observatory, Kavalur, during the first two months since the outburst are reported. The evolution of ...
  • Spectroscopic observations of Nu Centauri 
    Ashoka, B. N; Surendiranath, R; Kameswara Rao, N (Copernicus Foundation for Polish Astronomy, 1985)
    Presented are radial-velocity observations of the single-line spectroscopic binary and Beta Cephei-type variable Nu Cen, obtained in the period 1983-1984. New orbital elements have been determined by combining these ...
  • A study of planetary nebulae 
    Surendiranath, R (Astronomical Society of India, 1993)
  • The UV (IUE) spectrum of the planetary nebula PC 11 (HD 149427) 
    Parthasarathy, M; García-Lario, P; Pottasch, S. R; de Martino, D; Surendiranath, R (European Southern Observatory, 2000-03)
    The UV spectrum of PC 11 is found to show variations in the strength of the O III] 1666Å , N III] 1750Å and C III] 1909Å emission lines. The detection of continuum emission in the wavelength interval 2650Å to 3200Å indicates ...

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