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

  • Energetic flare zones on the Sun 
    Verma, V. K.; Pande, M. C.; Uddin, W. (1987)
    In this investigation, we have studied the latitudinal, longitudinal (northern and southern hemispheric) distributions based on 1737 major flared observed during solar cycles 19 and 20 (see subsequent paragraphs) and have ...
  • Brightness changes in P/Halley 
    Goraya, P. S.; Srivastava, R. K.; Uddin, W. (1988)
    Thirty photometric magnitudes, in each filter (UBV), of P/Halley (1982i) have been measured on 1986, January 12. They show short-term variability of about 0.15 magnitude. The present measurements show the active nature of ...
  • Photoelectric observations and the wave minimum of RS CVn 
    Srivastava, R. K. (1987)
    B, V observations of the eclipsing binary RS CVn have been presented. A dip around 0.ᴾ1 appears to be a wave minimum which fits well in the 'Wave minimum phase-time' relation, but deviates from the 'Wave aplitude-time' ...
  • Open clusters and galactic structure 
    Pandey, A. K.; Bhatt, B. C.; Mahra, H. S. (1988)
    The open clusters data compiled by Janes and Adler (1982) have been used to study the distribution of open clusters within 1500 pc of the Sun. It is found that the plane defined by the distribution of young open clusters ...
  • An anlysis of the light changes of the eclipsing binary XY Ceti in the frequency-domain 
    Srivastava, R. K. (1987)
    The photoelectric observations of the eclipsing binary XY Ceti presented by us (see Srivastava and Padalia, 1975) have been analysed by Okazaki (1978) and Ramella et al.(1980). They presented different sets of elements ...
  • 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.
  • Disc system Delta Capricorni 
    Srivastava, R. K. (1988)
    First UBV photoelectric photometry of the eclipsing binary system δ Cap has been presented. An improved period of 1.ᵈ022766 has been given. The duration of primary eclipsing comes out to be more than double the duration ...
  • 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 ...
  • Astrometric positions of Comet Wilson (19861) 
    Joshi, S. C.; Srivastava, J. B.; Padalia, T. D.; Kandpal, C. D. (1988)
    Positions of comet Wilson have been measured from the photographic plates taken at the Cassegrain focus of the 104-cm reflector of Uttar Pradesh State Observatory, Naini Tal.
  • Rapid changes of brightness in P/Halley 
    Goraya, P. S.; Uddin, W.; Srivastava, R. K. (1988)
    The results of photometric measurements (in UBV filters) of Comet P/Halley during four nights in January 1986 have been presented. Rapid recurring increases of P/Halley's brightness were observed during these four nights. ...
  • On the increase of solar activity in the southern hemisphere during solar cycle 21 
    Verma, V. K. (1987)
    The present paper investigates the north-south asymmetry for major flares (solar cycle 19 and 20), type II radio bursts (solar cycles 19, 20 and 21), white light flares (solar cycle 19,20 and 21), and gamma ray bursts, ...
  • 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 ...
  • Detailed period study of Delta Capricorni 
    Srivastava, R. K. (1988)
    Detailed period study of the eclipsing binary system Delta Cap is presented. Available times of minima have been given. Period changes in different protions off the instant period trend. A new period of 1.ͩ0227789 has been ...
  • Period study of XY Ceti 
    Srivastava, R. K. (1988)
    A first period study of the eclipsing binary XY Ceti is presented. A new period (P = 2.ᵈ7807135), based on all available times of minima, is given. Period changes in different portions of the O-C diagram, with a new period, ...
  • Spectrophotometric observations of Delta Capriconi 
    Srivastava, R. K.; Srivastava, J. B.; Joshi, S. C. (1988)
    Spectrophotometric observations of the eclipsing binary system δ Capriconi, covering the wavelength interval λλ3300-7300Å, have been presented. Comparison of the standard spectral scans of δ Cap with the spectral scans of ...
  • ST Persei: a possible multi-body system 
    Srivastava, R. K. (1988)
    Detailed period study of the eclipsing binary ST Per is presented. A new period (P=2.ͩ 648339) is given. Period changes in different portions of the O-C diagram with a new period have been estimated. The total changes in ...
  • Eclipsing binary signatures in Zeta Capricorni 
    Srivastava, R. K. (1988)
    Zeta Capricorni (ζ Cap HD 204075) was shown to be a Barium line spectroscopic binary, possessing strong BaII line by Bohm-Vitense (1980), Smith et al.(1980), Culiver (1981) and Smith and Lambert (1984). ζ Cap is shown to ...
  • UBV photometry of the eclipsing binary RZ Eridani 
    Srivastava, J. B.; Kandpal, C. D. (1988)
    U, B, and V observations of RZ Eri have been reported. COlours of comparison stars BD-10°994, BD-10°996 and of the variable RZ Eri have been presented. The observations of RZ Eri do not indicate the distortion wave in the ...
  • Scanner observations of Comet Wilson (1986(1)) 
    Sanwal, B. B.; Rautela, B. S. (1988)
    An estimate of the CN, C₂and C₃abundances and their production rates have been made from the spectrophotometric scans of the head of Comet Wilson.
  • Infrared excess in Wolf-Rayet stars 
    Singh, M. (1986)
    On the basis of continuum energy distributions in the wavelength region λ λ3200-11000 Å, effective temperature for 14 Wolf-Rayet stars are estimated by comparing with Kurucz (1979) model atmospheres. The continuum energy ...

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