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Browsing by Author "Joshi, G. C."

Browsing by Author "Joshi, G. C."

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  • (A-X) system of SiO in sunspots 
    Joshi, G. C.; Punetha, L. M.; Pande, M. C. (1979)
    The calculated equivalents widths of some lines of SiO in the umbral spectrum suggest that strong lines of Si²⁸ O¹⁶ , Si²⁹ O¹⁶ , and Si³⁰ O¹⁶, may be present in the sunspot ultraviolet spectrum. We also find that between ...
  • An analysis of the spectrum of Alpha Ursae Minoris 
    Sanwal, B. B.; Rautela, B. S.; Joshi, G. C. (1988)
    Three spectrograms of the cepheid Alpha Ursae Minoris (Polaris) taken at a dispersion of 17.8 Å mm on 18, 19, and 20 January, 1971 have been analysed for the determination of the abundances of some elements. The analysis ...
  • An analysis of the spectrum of the Zeta geminorum 
    Sanwal, B. B.; Rautela, B. S.; Joshi, G. C. (1986)
    Four spectrograms of the Cepheid ζ Geminorum at different phases have been analysed for the determination of the abundance of various elements. The analysis shows that the atmosphere of ζ Gem has an essentially solar composition.
  • ARIES imaging polarimeter 
    Rautela, B. S.; Joshi, G. C.; Pandey, J. C. (2004-09)
    An Imaging Polarimeter has been fabricated for use with liquid- N2 cooled CCD camera and is designed to suit 104-cm Sampurnanand telescope with an f/13 focus at Aryabhatta Research Institute of Observational ...
  • Basic parameters of open star clusters DOLIDZE 14 and NGC 110 in infrared bands 
    Joshi, G. C.; Joshi, Y. C.; Joshi, S.; Tyagi, R. K. (2015)
    The basic physical parameters of a poorly studied open cluster NGC 110 and an unstudied open cluster DOLIDZE 14 are estimated in the present study using the archival PPMXL and WISE catalogues. The radius of both the clusters ...
  • CCD photometry of the Markarian galaxy Mrk 1043 
    Joshi, S. C.; Rautela, B. S.; Joshi, G. C.; Srivastava, J. B. (1998)
    CCD photometric observations of Mrk 1043 have been obtained in BVRI filters. The integrated magnitude and colours of the galaxy have been estimated. The B-V colour of the Mrk 1043 is much bluer than the average colour of ...
  • Centre to limb variation of CH line profile parameters 
    Punetha, L. M.; Joshi, G. C. (1984)
    Four CH line profiles at µ= 1.0 and 0.2 were Fourier transformed. They show(i) turbulent velocity εt=4.0 km s-1, and (ii)an increase in the Doppler width parameter by a factor of 1.03 in going form the centre to limb.
  • CN and C₂ in Hyakutake (C/1996 B2) 
    Rautela, B. S.; Joshi, G. C.; Srivastava, J. B. (1998)
    CN (∆v=0) and C₂ (∆v = +1,0, -1) emission fluxes at 388.3, 469.5, 516.5 and 553.8 nm respectively and continuum fluxes at 484.0 nm have been analysed to get the production rates of molecular species CN and C₂ and dust in ...
  • Complex Stellar System ESO65SC03: Open Cluster or Remnant? 
    Joshi, G. C.; Joshi, Y. C.; Joshi, S.; Chowdhury, S.; Tyagi, R. K. (2015)
    We present a complete spatial and dynamical study of the poorly populated stellar system ESO65SC03. The radial distribution of the system gives a core and cluster radii of 1.10±0.63 and 5.36±0.24 arcmin, respectively. The ...
  • C₂ in eta aquilae spectrum 
    Bondal, K. R.; Joshi, G. C.; Pande, M. C. (1973)
    The equivalent width of R₁ (16) line of the 0-0 band of the Swan system of C₂ calculated for the minimum phase of light variation in η Aql comes out to be 27 mÅ. Thus, if Dawe’s model atmosphere and the assumed abundance ...
  • Dependence of molecular dissociation equilibrium on magnetic field strength in sunspots 
    Gaur, V. P.; Pande, M. C.; Tripathi, B. M.; Joshi, G. C. (1971)
    It is shown that the total number of CO, CN, C₂, UH, NH and CH molecules varies significantly with magnetic field strength in sunspots. The equivalent widths of two first overtone lines of CO belonging to 0-2 vibration-rotation ...
  • Doppler width of CH lines 
    Punetha, L. M.; Joshi, G. C. (1991)
    Twenty-one CH line profile at the centre of the solar disk were Fourier-transformed to derice the Doppler widths. The Doppler width increases linearly with the equivalent width.
  • Doppler width of CN lines in the sun 
    Punetha, L. M.; Joshi, G. C. (1984)
    The Doppler width of 0-1, 1-2 an 2-3 vibrational bands of the violet system of CN molecule in the solar atmosphere increase linearly with equivalent width upto ≈ 20 mÅ.
  • Dust shell around F and G main-sequence stars 
    Rautela, B. S.; Sanwal, B. B.; Joshi, G. C. (1990)
    One-hundred and three nearby bright Main-Sequence stars of spectral type F and G have been searched for infrared excess in order to find out 'Vega-like' characteristics. In our sample of bright Main-Sequence F and G stars ...
  • Equivalent widths of molecular lines in eta aquilae 
    Pande, M. C.; Joshi, G. C.; Bondal, K. R. (1974)
    Using dawe's model atmospheres the equivalent widths of R1 line belonging to the 0-0 band of the electronic transition B2∑+ →X2∑+ of the CN molecule were calculated for various phases of light variation in ŋAql. the ...
  • Franck-Condon factors for some abundant umbral molecules 
    Joshi, G. C.; Joshi, U. C.; Punetha, L. M.; Pande, M. C. (1982)
    Some of molecular transitions in UV in sunspots are pointed out and Franck-Condon factors for some of these have been calculated.
  • Isotopic lines of SiO in sunspots 
    Pande, M. C.; Joshi, G. C. (1978)
    As the isotopic shift for the vibration rotation band is generally much larger than the isotopic shift for the corresponding electronic transitions and thus facilitating separation of isotopic lines, the vibration rotation ...
  • Model dependence of the rotational temperature of SiO in sunspots 
    Punetha, L. M.; Joshi, G. C. (1984)
    Centre-to-limb variation of the roatational temperature of the fundamental band of SiO in different sunspot models has been calculated. The possibility of using these calculations to pick up the true model on the basis of ...
  • Molecules in eta aquilae 
    Pande, M. C.; Joshi, G. C.; Tripathi, B. M.; Gaur, V. P. (1971)
    The total numbers Iφ(AB) of a given molecule AB in a column extending between τ=0 to τ=3.00 have been calculated for various phases ɸ of light variations in η Aql for the molecules CO, CN, C ₂ , OH, NH and CH. It is found ...
  • Molecules in white dwarfs 
    Gaur, V. P.; Tripathi, B. M.; Joshi, G. C.; Pande, M. C. (1988)
    Molecular dissociation equilibrium calculations were done for the model atmospheres of DA and non-DA white dwarfs. Our calculations show that He₂⁺ and HeH⁺ appears as most abundant molecules in the atmospheres of non-DA ...

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