IIA Institutional Repository

Browsing by Subject "Oxygen"

Browsing by Subject "Oxygen"

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  • BVRI polarimetry of carbon stars 
    Raveendran, A. V (European Southern Observatory, 1991-03)
    BVRI polarimetry of carbon stars belonging to different variability types - VX And, UU Aur, T Cae, Y CVn, U Hya, Y Hya, RY Mon, W Ori, Y Per, RT Pup, and X Vel - is presented. Though there is significant scatter, on the ...
  • The chemical composition of algol systems. III - Beta Lyrae-nucleosynthesis revealed 
    Balachandran, S; Lambert, D. L; Tomkin, J; Parthasarathy, M (Royal Astronomical Society, 1986-04)
    The B8 primary of the eclipsing binary star Beta Lyr is subjected to high S/N ratio Reticon observations of the visible and near-IR lines of He, C, N, O, Ne, and Fe, in order to determine their abundances. N is noted to ...
  • The hot R Coronae Borealis star DY Centauri: Nebular and photospheric lines 
    Kameswara Rao, N; Giridhar, S; Lambert, D. L (The European Southern Observatory, 1993-12)
    High resolution spectra in the red region of the hot R CrB star DY Cen show the following characteristics: a strong absorption line spectrum dominated by lines of C II, N II, and Ne I inverse P-Cygni type profiles of some ...
  • The optical spectrum of nova LW Serpentis 1978 
    Prabhu, T. P; Anupama, G. C (Kluwer Academic Publishers, 1987-03)
    Optical spectroscopic data of the nova LW Serpentis 1978, covering its diffuse-enhanced phase until the onset of the forbidden O I line flash, were obtained at the Vainu Bappu Observatory, Kavalur, between March 10 and ...
  • Planetary nebulae and nitrogen enrichment in the galaxy 
    Mallik, D. C. V (Geneva Observatory, 1978)
    The extent of nitrogen enrichment of the interstellar gas by planetary-nebula formation is evaluated, and the nitrogen and oxygen abundance gradients in the disk of the Galaxy are derived on the basis of a simple model for ...
  • Spectral lines behavior of Be I and Na I isoelectronic sequence in Debye plasma environment 
    Chaudhuri, R. K; Chattopadhyay, S; Mahapatra, U. S (American Institute of Physics, 2012-08)
    We report the plasma screening effect on the first ionization potential (IP) and [He]2s/sup2/ (/sup1/S/sup0/)→[He]2s2p/2s3p allowed (/sup1/P/sub1/) and inter-combination transitions (/sup3/P/sub1/) in some selected Be-like ...

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