Research Papers: Recent submissions

  • New period and period variations of DX Aqyarii 
    Srivastava, R. K. (1986)
    The new period (P=0. ͩ461700) of the eclipsing binary system DX Aqr has been presented, which is based on available times of minima. O-C diagram of DX Aqr has been presented for the first time, and the period variations ...
  • Mass loss from Wolf-Rayet stars 
    Singh, M.; Chaubey, U. S. (1986)
    The observed times of minimum light derived from the photometry of the Wolf-Rayet eclipsing binary stars CQ Ceq and V444 Cyg are used to estimated the mass-loss rate of the Wolf-Rayet components in several modes of mass-loss ...
  • Wave minimum of AR Lacertae 
    Srivastava, R. K. (1986)
    U, B and V observations of AR Lacertae, obtained in 1981, have been presented alongwith the colour indices. A distortion wave minimum is found to lie at 0.21. The amplitude of the wave minimum in V filter is too weak, ...
  • Period variations in BZ Eridani 
    Srivastava, R. K. (1986)
    The O-C diagram of BZ Eri has been presented for the first time, and the period variabtins present in the system have been analysed. In all, eight period decreases and eight period increases are noticed. Of these, four ...
  • BV observations of the eclipsing binary WX Eridani 
    Srivastava, J. B.; Kandpal, C. D. (1986)
    Photoelectric observations of WX Eridani in B and V filters have been discussed. The maximum magnitudes of the system are B= 9. ͫ 70 and V= 9. ͫ 46. the B-V colours of the components are 0. ͫ 16 and 0. ͫ 80 for the ...
  • Coronal heating by Alfven waves 
    Dwivedi, B. N.; Srivastava, A. K. (2010-02-10)
    Observations of ultraviolet, X-ray and the wind from the Sun confirmed Bengt Edlen's prediction of a million Kelvin hot solar atmosphere.
  • Flare features of AR Lacertae 
    Srivastava, R. K. (1986)
    BV optical flares of AR Lacertae, found in 1979 observations, are presented and their features are discussed. The effect of wave migration and the significance levels of flares originating around both eclipses have been ...
  • Spectrophotometry of some Be Stars 
    Singh, M. (1986)
    The continuum energy distributions of six Be stars, namely 25 Cyg, 31 Peg, HR 8758, 14 Lac, 12 Vul and β Psc in the wavelength region λ λ3200-7800 Å, are presented. Comparing the observed energy distributions with those ...
  • On the oscillator strength and the dissociation energy of CN molecules 
    Sinha, K.; Tripathi, B. M. (1986)
    We compute the equivalent widths of CN red system in the solar spectrum and compare them with the observational data, in order to choose between various published oscillator strengths (f₀ ̠ ₀) and values of dissociation ...
  • Photometry of open cluster stock 17 
    Pandey, A. K. (1986)
    Photoelectric magnitudes of 10 stars in the field of stock 17 have been obtained. The reddening is uniform across the cluster. A distance of 2.12 kpc has been estimated for the cluster. It is concluded that the age of the ...
  • The nature of the eclipses of VZ hydrae 
    Padalia, T. D. (1986)
    Further study of the observed U, B, V light curves of VZ Hya reveals that the primary eclipse is an occultation.
  • Photoelectric study of AW UMa 
    Sridharan, R. K.; Padalia, T. D. (1986)
    UBV photoelectric photometry of the eclipsing binary system AW UMa has been presented. A slightly improved period of 0 ͩ.4387304 has been given. The colour of the system has been discussed. Eccentricity is present in the ...
  • Mass loss from Wolf-Rayet stars 
    Singh, M. (1986)
    Mass loss rates for 9 LMC WR stars are determined using IUE, UV and visible spectrophotometric observations. A good correlation of mass loss rate with effective temperature and luminosity is indicated by the data, in ...
  • Photometry of open cluster NGC 1931 
    Pandey, A. K. (1986)
    Photoelectric UBV magnitudes and colours have been determined for stars in the filed of NGC 1931. The reddening across the cluster varies from 0. ͫ 33 to 1. ͫ 20. A distance of 2.16 kiloparsecs has been estimated fro the ...
  • Absolute spectrophotometry of comet Kohoutek 1973f during post-perihelion passage 
    Goraya, P. S.; Rautela, B. S.; Sanwal, B. B. (1986)
    Absolute spectrophotometry of the coma of Comet Kohoutek 1973f during post-perihelion period has been presented for seven nights in January 1984. Moderately wide range of heliocentric distance (0.436-0.799 AU) covered ...
  • Longitudinal distribution of the hard X-ray bursts on the sun 
    Verma, V. K.; Pande, M. C. (1985)
    The analysis of 315 hard X-ray bursts (HXR) producing solar flares observed by Hinotori satellite shows that the HXR bursts occur most prominently at 110°, 140°, 290° and 320° longitude, respectively. These longitudes are ...
  • Probing spectral properties of radio-quiet quasars searched for optical microvariability 
    Chand, H.; Wiita, P. J.; Gupta, A. C. (2010)
    We obtained Sloan Digital Sky Survey spectra for a set of 37 radio-quiet quasars [(radio-quiet quasi-stellar objects (RQQSOs)] that had been previously examined for rapid small-scale optical variations, or microvariability. ...
  • An analysis of spectrophometric observations of comets Austin (1982g) and Bradfield (1980t) 
    Singh, P. D.; Sinha, K.; Tripathi, B. M.; Roberty, H. M. B. (1989)
    Post-perihelion observed emission fluxes at 388 nm (CN) and 516 nm (C₂) of the coma of comets Austin (1982g) and Bradfield (1980t) are analysed in the framework of the Haser model. Ratios of Haser model CN and C₂ parent ...
  • Field star contamination in open star cluster NGC 2301 
    Mohan, V.; Sagar, R. (1988)
    Photographic photometry of about 900 stars down to V = 17 mag has been carried out in the region of the open clusters NGC 2301. The cluster region seems to be severely contaminated by fields stars. Statistical criteria ...
  • Constancy of period in TX Ceti 
    Srivastava, R. K. (1990)
    A slightly improved period (P = 0.ᵈ7408401) of the eclipsing binary system TX Ceti has been given, which is based on all available times of minima. The O-C diagrams based on the period given in PPEN (1980) and based on the ...

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