ARIES Insitutional Digital Repositary (ARIES-IDR): Recent submissions

  • A bibliography of colour magnitude diagram studies of star clusters in the Magellanic Clouds 
    Sagar, R.; Pandey, A. K. (1989)
    Published literature has been surveyed to compile a bibliography of colour magnitude diagram studies of Magellanic Clouds star clusters. Morphological parameters of colour magnitude diagram, e.g. location of main sequence ...
  • Population I-type objects and galactic structure 
    Pandey, A. K.; Bhatt, B.C.; Mahra, H. S. (1990)
    Data on open clusters, WR stars and supernova remnants (SNRs) have been used to study the large-scale structure of Milky Way. A comparison of the distributions of WR stars and SNRs indicates a weak correlation. It is also ...
  • Is CH+ present in the solar spectrum? 
    Sinha, K.; Tripathi, B. M. (1990)
    Identification of the A¹ II -X¹ Ʃ transitions of the CH+ molecules in the solar spectrum was reinvestigated by using new laboratory data on molecules, standard photospheric models, the KPNO and the Liege solar atlases. We ...
  • Period study of AL Camelopardalis 
    Srivastava, R. K. (1991)
    A detailed period study of the eclipsing binary system AL Cam is presented. A new period of 1.ᵈ3283304 has been given. Period fluctuations are apparent around the years 1931, 1934, 1948, and 1965. Large scatter present in ...
  • The nature of velocity fields in quiescent prominences 
    Bondal, K. R.; Pande, M. C. (1991)
    It is shown that for certain definite conditions of symmetry imposed on the permitting magnetic field geometry for an isothermal case in Kippenhahn and Schluter's (1957) model of a quiescent prominence, any irrotational ...
  • Period changes in DF hydrae 
    Srivastava, R. K. (1991)
    The period study of the eclipsing binary DF Hya, based on up-to-date minima has been presented. The least-squares method has been applied to obtain a new period, which comes out to be .ᵈ3306017. Period changes are found ...
  • The distribution of sunspots over the sun 
    Uddin, W.; Pande, M. C.; Verma, V. K. (1991)
    The distribution of the sunspots for the period 1967-1987 (solar cycles 20 and 21) is presented here. We find that the ± 11-20° latitude belt is most prolific for the occurrence of various spot types irrespective of ...
  • A period study of V450 herculis 
    Srivastava, R. K. (1991)
    A detailed period study of the eclipsing binary system V450 Her has been presented. A new period (P = .ᵈ712724) has been given. The period changes in different portions of the O-C diagram, based on new period, have been ...
  • On the shell star pleione (BU Tauri) 
    Ojha, D. K.; Joshi, S. C. (1991)
    BU Tauri (Pleione) an interesting star in the Pleiades cluster, has been observed spectrophotometrically. The energy distribution curves of the star have been discussed vis a vis model atmospheres for normal stars in the ...
  • Integrated luminosity distribution of galactic open clusters 
    Bhatt, B.C.; Pandey, A. K.; Mahra, H. S. (1991)
    The integrated magnitudes of 221 galactic open clusters have been used to derive the luminosity function. The completeness of the data has been discussed. In the luminosity distribution the maximum frequency of clusters ...
  • 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.
  • Irrotational motion in quiescent prominences 
    Pande, M. C.; Bondal, K. R. (1991)
    On the basis of Kippenhahn and Schluter's magnetohydrostatic model of a quiescent prominence, an attempt has been made to study the effect of irrotational motion existing in the prominences on the magnetic field pattern ...
  • Search for a 152-158 days periodicity in the occurrence rate of solar flares inferred from spectral data of radio bursts 
    Verma, V. K.; Joshi, G. C.; Uddin, W.; Paliwal, D. C. (1991)
    We have carried out a power spectrum analysis of the daily number of solar flares producing type I, II, III, IV, and V radio bursts for the period 1980-1984. The analysis shows that type II and IV radio bursts confirm the ...
  • UBV photometry of ER Vulpeculae 
    Srivastava, R. K.; Padalia, T. D.; Srivastava, J. B. (1991)
    UBV photometry of RS CVn- type eclipsing binary system ER Vulpeculae has been presented. The period comes out to be 0.ᵈ698093. The average depths of primary and secondary minima are, respectively,0.ᵐ21 and 0.ᵐ12. The colours ...
  • Spectrophotometric observations of UX Arietis 
    Joshi, S. C.; Srivastava, R. K.; Srivastava, J. B. (1991)
    Spectrophotometric observations of the RS Cvn binary UX Arietis have been presented. The comparison of the observed fluxes with model atmospheres indicates that during the four phases observed, the temperature does not vay ...
  • Colour indices of the Markarian galaxies 
    Ojha, D. K.; Joshi, S. C. (1991)
    By use of the ANS ultraviolet fluxes, optical (UBV) and IRAS infrared fluxes, several colour indices for a few Markarian galaxies have been investigated. A comparison of these indices with those for normal NGC galaxies has ...
  • The acceleration of electrons and ions in solar flares 
    Verma, V. K. (1991)
    We find that gamma-ray line (GRL) emissions start later than the hard X-ray (HXR) emissions during impulsive and extended solar flares. Starting delay is more in the case of extended solar flares suggesting a slow acceleration ...
  • Molecular emission from the head of comet Okazaki-Levy-Rudenko (1989r) 
    Sanwal, B. B.; Rautela, B. S. (1991)
    Spectrophotometric scans of the head of Comet Okazaki-Levy-Rudenko during three nights in October 1989 are presented. An estimate of the CN and C₂ production rates and column densities have been made.
  • Study of periodicities of solar nuclear gamma ray flares and sunspots 
    Verma, V. K.; Joshi, G. C.; Paliwal, D. C. (1992)
    Here we have carried out a power-spectrum analysis of solar nuclear gamma-ray (NGR) flares observed by SMM and HINOTORI satellites. The solar NGR flares show a periodicity of 152 days, confirming the existence of a 152-158 ...
  • A study of young open clusters 
    Pandey, A. K.; Bhatt, B. C.; Mahra, H. S. (1991)
    Star clusters constitute a principal link between stellar evolution theory and the observable universe. The important constraints which can be imposed on the theory of star formation by studies of galactic open clusters.

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