Research Papers: Recent submissions

  • Period study of IT Persei 
    Srivastava, R. K. (1990)
    A new period (P = 1.ᵈ533731) of the eclipsing binary system IT Persei has been given, which is based on all available times of minima. O-C diagrams of IT Persai, based on the period given in PPEN (1980) and based on the ...
  • Evolution of solar magnetic field and associated multiwavelength phenomena: flares events on 2003 November 20 
    Kumar, P.; Manoharan, P. K.; Uddin, W. (2010)
    We analyze Hα images, soft X-ray profiles, magnetograms, extreme ultra-violet images and, radio observations of two homologous flare events (M1.4/1N and M9.6/2B) on 2003 November 20 in the active region NOAA 10501 and ...
  • On the periodicity of high speed solar wind streams 
    Verma, V. K. (2001)
    In the paper we have investigated the periodicity of high speed solar wind (HSSW) streams using the technique of power spectrum analysis. The data for HSSW streams has been taken from the papers by Lindblad and Lundstedt ...
  • Spectrophotometry of AR Lacertae 
    Chaubey, U. S.; Singh, M. (1990)
    Spectrum scans of the RS CVn-type eclipsing binary star AR Lac at different phases in the wavelength range λλ3200-7600 Å taken through Hilger and Watts monochromator equipped with 104-cm telescope of Uttar Pradesh State ...
  • 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 ...
  • Multicolour deep CCD photometric study of the moderately young southern open star clusters NGC 3228, NGC 4103, NGC 5662 and NGC 6087 
    Sagar, R.; Cannon, R. D. (1997)
    CCD observations in the U , B, V , R and I passbands have been used to generate colour- colour and deep colour-magnitude diagrams for the young open star clusters NGC 3228, NGC 4103, NGC 5662 and NGC 6087. The sample ...
  • Diagnostic tools for sunspots: the monecules C₂, MgH and TiO 
    Sinha, K. (1994)
    The aim of the present communication is to draw attention to the value of simultaneous observations of sunspots umbrae and the quiet Sun in selected molecular lines. It is felt that such observations may lead to an array ...
  • Evidence for shock acceleration and integalactic magnetic fields in a large-scale filament of galaxies ZwCl 2341.1+0000 
    Bagchi, J.; EnBlin, T. A.; Miniati, F.; Singh, M.; Raychaudhury, S.; Humeshkar, N. B. (2002)
    We report the discovery of large-scale diffuse radio emission from what appears to be a large-scale filamentary network of galaxies in the region of cluster ZwCl 2341.1+0000, and stretching over an area of at least 6 ...
  • Period variations in SZ Arietis 
    Srivastava, R. K. (1990)
    A new period (P = 1.ᵈ7175405) of the eclipsing binary system SZ Arietis has been presented. Period changes in different portions of the O-C diagram, with new period, have been estimated.The total change in period (∆P) ...
  • Variation in comet P/Halley 
    Goraya, P. S.; Duggal, H. K.; Srivastava, R. K.; Uddin, W. (1989)
    Photoelectric photometry (UBV) of Comet P/Halley performed on April 29, 1986 has been presented. The observations show short-term variability in light. The amplitude of variability in U filter is much more than in B and V filters.
  • Star formation efficiency in clouds of various masses 
    Pandey, A. K.; Paliwal, D. C.; Mahra, H. S. (1990)
    The present study is aimed at finding out the effect of variation of the initial mass function (IMF) on star - formation efficiency (SFE) in clouds of various masses. Using the model of Elmegreen and Clemans, it is found ...
  • Scanner observations of comet Bradfield (1987s) 
    Sanwal, B. B.; Rautela, B. S. (1990)
    Spectrophotometric observations of the head of comet Bradfield (1987s) during three nights in 1987 are presented. An estimate of the CN, C₂ and C₃ column densities and production rates have been made.
  • On ionized molecules in the solar atmosphere 
    Sinha, K.; Tripathi, B. M. (1990)
    The partial pressures of 20 ionic molecular species are reported here for standard facular, photospheric and sunspot model atmospheres with a view to picking up ionized molecules for a possible identification in the solar ...
  • Gravitational radiation and spiralling time of close binary systems (III) 
    Padalia, T. D. (1990)
    Twenty-seven typical binary systems have been investigated to study their power-output by gravitational radiation (Pв) and spiralling time (τₒ) relation. It was found that these binary systems form two distinct groups. New ...
  • The young open star clusters: stability and structure 
    Pandey, A. K.; Mahra, H. S.; Sagar, R. (1990)
    It is found that the differential extinction ∆E(B - V) in open clusters, which may be due to the presence of gas and dust, decreases systematically with the age of the cluster. Consequently we can infer that the average ...
  • Optical variability of radio-intermediate quasars 
    Goyal, A.; Krishna-Gopal; Joshi, S.; Sagar, R.; Wiita, P. J.; Anupama, G. C. (2010)
    We report the results of our intensive intranight optical monitoring of eight optically bright ‘radio-intermediate quasars’ (RIQs) having flat or inverted radio spectra. The monitoring was carried out in R band on ...
  • 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 ...

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