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Browsing Aryabhatta Research Institute of Observational Sciences by Issue Date

Browsing Aryabhatta Research Institute of Observational Sciences by Issue Date

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  • Intensity oscillations across the Ca II K line 
    Punetha, L. N (1974)
    Intensities at various wavelengths in the Ca II K line over a 10 minute duration time series spectra have been examined for oscillations. Three components have been observed:1) large period, ≥ 1000 second, due to the slowly ...
  • Ballik-ramsey band in solar spectrum 
    Pande, M. C.; Sinha, K. (1974)
    Equivalent width calculations for a line 1.83 μ of the 0-0 vibrational band of the Ballik-Ramesy band system has been carried out in two photospheric models- BCA and HSRA. Centre to limb variation of the above line is given ...
  • A luminosity index for bright K0-K5 stars 
    Chaturvedi, J. P. (1974)
    An index for luminosity classification of K0-K5 stars based upon broad band UBRI observations has been obtained and discussed. This index has been employed to obtain the MK-luminosity classifications for 21 bright stars ...
  • Intensity oscillations across the Ca II K line 
    Punetha, L. M. (1974)
    Intensities at various wavelengths in the Ca II K line over a 10 minute duration time series spectra have been examined for oscillations. Three components have been observed: 1) large period, ≥1000 second, due to the ...
  • Energy distribution in early K-star 
    Chaturvedi, J. P.; Sinvhal, S. D. (1974)
    The spectral distribution of energy for 21 early K-star in the wavelength reason 450 nm to 750 nm at a definition of 5 nm have been obtained. A two dimensional photometric spectral classification index- system for these ...
  • 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 ...
  • Vibration-rotation bands of HF, HBr and HI in the sunspot spectrum 
    Pande, M. C.; Gaur, V. P. (1974)
    The calculated equivalent widths of R(7), R(9) and R(13) lines of 1-2 vibration-rotation band of HF for Henoux’s (1969) sunspot model suggest the presence of this band in sunspot spectrum. The reasons for the absence of ...
  • Fine structure in CaII K line 
    Punetha, L. M. (1974)
    CaII K line spectrograms were traced at various wavelengths along the slit and also along the dispersion at regular intervals. Statistical properties, root mean square variation, full width at half maxima, autocorrelation ...
  • Flares on AD leonis and YZ minoris 
    Kapoor, R. C.; Sinvhal, S. D. (1974-06-24)
  • Variability of 59 Aur and 39 Cnc 
    Gupta, S. K.; Bhatnagar, A. K. (1974-07-14)
  • Photoelectric monitoring of the flars star AD Leo 
    Sanwal, B. B. (1974-10-14)
  • Three- colour photometry of TW CAS 
    Kandpal, C. D. (1975)
    Photoelectric elements of the system TW Cas have been determined in U,B and V filters. A refined period of 1ᵈ.428 324 77 has been given though no change in period is noticed. Spectroscopic elements given by struve have ...
  • Photoelectric elements of the eclipsing binary XY Ceti 
    Srivastava, R. K.; Padalia, T. D. (1975)
    The absolute elements of the system XY Ceti have been obtained on the basis of the spectroscopic elements given by Popper (1971) and the photoelectric elements derived by us. The colours of the components have been obtained. ...
  • Three- colour photometry of the eclipsing binary EI cephei 
    Padalia, T. D.; Srivastava, R. K. (1975)
    The photoelectric elements of the system EI cephei have been determined U,B,V colours. The absolute dimensions have been determined and some evolutionary aspects have been discussed.A modified period of 8ᵈ.439334 has been ...
  • The photoelectric elements of AS Camelopardalis 
    Padalia, T. D.; Srivastava, R. K. (1975)
    Improved geometrical elements of the system AS Cam have been obtained and the colour of the system has been discussed. The absolute dimensions have also been obtained on the basis of the spectroscopic elements given by ...
  • Flare activity of YZ CMi 
    Sanwal, B. B. (1975-05-14)
  • Vibration rotation bands of NO in sunspots 
    Gaur, V. P. (1976)
    The equivalent widths of R1(26.5)lines,belonging to the 1-0,2-1 and 3-2 vibration bands of NO near 5.3 µm,have been computed for two different sunspot models at four positions on the disc.The computed equivalent widths in ...
  • Photoelectric elements of CD TAU 
    Srivastava, J. B. (1976)
    Photoelectric and absolute elements of the system CD Tau have been determined in U, B and V filters. The system is a detached one.
  • SH on the sun 
    Sinha, K.; Joshi, G. C.; Pande, M. C. (1976)
    The theoretical estimates of the abundances and intensities of the fraunhofer lines for various atomic and molecular species facilitate identification and clarify the role of blending produced by the nearby lines in the ...
  • Spectrophotometric determination of the temperature of the Cepheid ζ geminorum 
    Rautel, B. S.; Joshi, S. C. (1976)
    The absolute energy distributions of the Cepheid ζ Gem at several phases of the light cycle have been given. By matching these with suitable model atmospheres, the effective temperatures of the star at these phases have ...

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