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Browsing by Subject "Visible spectrum"

Browsing by Subject "Visible spectrum"

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  • Evolution of the optical spectrum of SN 1987a in the Large Magellanic Cloud 
    Ashoka, B. N; Anupama, G. C; Prabhu, T. P; Giridhar, S; Ghosh, K. K; Jain, S. K; Pati, A. K; Kameswara Rao, N (Indian Academy of Sciences, 1987-06)
    The evolution of the spectrum of SN 1987a is traced from 1987 February 26 to March 31. Based on the low-resolution spectroscopic data the authors identify the lines of H, He I, Na I, Fe II, Sc II, Ca II which are known to ...
  • Flares on AM Canum Venaticorum 
    Marar, T. M. K; Padmini, V. N; Seetha, S; Narayanan Kutty, K. R; Kasturirangan, K; Rao, U. R; Bhattacharyya, J. C (European Southern Observatory, 1988-01)
    AM CVn, an interacting binary system consisting of two helium white dwarfs, has been classified as a nova-like object. Normally it exhibits only small amplitude modulations of 0.05 mag with a 1051 s periodicity. The authors ...
  • H-alpha variability in the quiescent spectrum of the recurrent nova T Coronae Borealis 
    Anupama, G. C; Prabhu, T. P (Blackwell Publishing, 1991-12)
    The emission lines in the quiescent spectrum of the recurrent nova T Coronae Borealis are variable. Optical spectra recorded during the years 1985-90 show one full cycle of high and low states. After removing the slow ...
  • A new discussion on the M(v) - W(O I 7774 A) relationship for F-G stars in the light of high-resolution data 
    Arellano Ferro, A; Giridhar, S; Goswami, A (Royal Astronomical Society, 1991-05)
    High-resolution CCD data and a large group of F-G stars of fundamentally determined distances are used here to investigate the intrinsic nature of the M(v) - W(O I) relation and the effect of other atmospheric parameters ...
  • On the coronal lines 5303 A and 6374 A 
    Peraiah, A; Varghese, B. A (Springer, 1989-06)
    Theoretical calculations of the observed coronal emission line profiles of Fe XIV (5303 A) and Fe X (6374 A) ions, which are observed at the time of total solar eclipse, are presented. Baumbach's relation of electron density ...
  • Optical interferometric observations of a transient event of 1986 March 13 in the coma of Comet Halley 
    Prasad, D. C; Chandrasekhar, T; Desai, J. N; Ashok, N. M; Krishan, V (Indian Academy of Sciences, 1989-03)
    During the recent apparition of Comet Halley in 1985-86, a transient ionic event in the form of a blob of H2O(+) emission was recorded in the coma at about 0 h UT on March 13, 1986. Observations were carried out using a ...
  • 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 ...
  • Optical spectrum of supernova 1989 B in NGC 3627 
    Prabhu, T. P; Krishnamurthi, A (The European Southern Observatory, 1990-06)
    Spectra of SN 1989 B in NGC 3627 were recorded photographically on three nights near maximum and two nights near seven weeks from maximum. The spectrum and its evolution bears a close resemblance to a typical type Ia ...

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