Research Papers: Recent submissions

  • 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 ...
  • Semi-regularities in the photospheric magnetic fields 
    Shelker, R. N.; Pande, M. C. (1986)
    Using Stanford large-scale magnetic field synoptic charts of rotation 1676 to 1739 and by delineating LLUMR, i.e., long-lived unipolar magnetic regions of both polarities surviving at least for four solar rotations, the ...
  • Association of solar flares with twisting of magnetic neutral lines 
    Uddin, W.; Pande, M. C.; Shelke, R. N. (1986)
    Assuming that the flares tend to occur in highly sheared magnetic fields which also lead to a twisting of magnetic neutral line in complex active regions, we have defined a ‘twisting index’. The correlation of this twisting ...
  • On some visible and infrared atomic hydrogen lines in three photospheric models 
    Bondal, K. R.; Gaur, V. P. (1986)
    The behavior of the line profiles in the wings of the first four lines of the Balmer, Paschen and Brackett series in the solar spectrum at the disc centre has been investigated with a view to comparing the computed profiles ...
  • Gravitational radiation and spiralling time of close binary systems (II) 
    Padalia, T. D. (1988)
    Power-output by gravitational radiation (Pв) and spiralling time (τₒ) for individual systems of twelve early (B) type binary systems have been evaluated. A new relation between Pв and τₒ obtained. It is found that most of ...

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