Research Papers: Recent submissions

  • Photoelectric elements of the eclipsing binary XY Cep 
    Srivastava, J. B.; Kandpal, C. D. (1979)
    The light curve and U, B and V observations of the system XY Cep have been presented. Photoelectric and absolute elements of the system have been determined. It is a semi-detached system.
  • Period study of the binary star SW Cygni 
    Chaubey, U. S. (1980)
    The O-C curve of SW Cyg between 1880 and 1977 is presented and discussed. It is found that the orbital period undergoes a systematic change, becoming greater with time. In addition, a periodic oscillation of amplitude ...
  • HD 200925, A pulsating variable 
    Gupta, S. K.; Padalia, T. D. (1980)
    The star HD 200925 (BD +50d3259) was observed by Bedolla and Pena (1979) on four nights during 25th to 28th September 1978 in V filter. They reported this star as a variable with a tentative period of 0.238d, and no ...
  • The effect of metallicity on the empirical relations for RR Lyrae stars II: the P-L-C relations 
    Mahra, H. S.; Sinvhal, S. D. (1980)
    The coefficients in the P-L-C relation for RR Lyr stars show dependence on the metallicity parameter ΔS. For the range of metallicity and effective temeperatures of RR Lyr stars, the effect of metallicity on the absolute ...
  • Photoelectric photometry of the spectroscopic binary HD 91948 
    Padalia, T. D. (1980)
    The star HD 91948 (BD+60d1274) has been found to be a spectroscopic binary by Gorga (1971) with an orbital period of 2.7700266d. No photoelectric work on this star is available in the literature. The purpose of our ...
  • Flare like activities in eclipsing binary DI Peg 
    Chaubey, U. S. (1980)
    The eclipsing binary DI Peg (BD+14d5006, HD 220619) was selected for UBV photometry because earlier photometric investigations drew attention to its interesting nature (Jensch, 1934, Rucinski, 1967 and Binnendijk, ...
  • Spectrophotometric observations of Mira Ceti 
    Joshi, S. C.; Rautela, B. S.; Sanwal, B. B. (1980)
    Following an announcement in the IAU Circular No. 3407 by S. McLean, we have observed the long period variable Mira (o Ceti) on two nights (6 and 18 October 1979) with the help of a scanner attached to the 104-cm reflector ...
  • The effect of metallicity on the empirical relations for RR Lyrae stars I: effective temperature and colour 
    Mahra, H. S.; Sinvhal, S. D. (1980)
    It has empirically been shown that, for a given value of the effective temperature, the correction in (B-V) due to line blanketing varies linearly with the metallicity parameters ΔS. Next, on the basis of considerations ...
  • Evidence of solar flare triggering due to loop-loop interaction caused by footpoint shear motion 
    Kumar, P.; Srivastava, A. K.; Somov, B. V.; Manoharan, P. K.; Erdelyi, R.; Uddin, W. (2010-11-10)
    We analyze multi-wavelength data of an M7.9/1N class solar flare which occurred on 2006 April 27 in AR NOAA 10875. GOES soft X-ray images provide the most likely signature of two interacting loops and their reconnection, ...
  • Observations of total solar eclipse of February 16, 1980 
    Gaur, V. P.; Bondal, K. R.; Sinha, K.; Joshi, G. C.; Pande, M. C. (1980)
    We have successfully photographed flash spectrum sequence just before and just after the totality. About 25 frames on each occurrence of flash were registered.
  • Photoelectric behaviour if V 818 Sco and X-Per 
    Sanwal, B. B. (1980)
    The variable star V 818 Sco identified as the optical counterpart of Scorpius X-1 (Sandage et a1.,1966) has been extensively studied by many photometric observers. Despite these extensive observations including those ...
  • Photoelectric study of the δ scuti star HR 1225 
    Gupta, S. K. (1980)
    The periodogram analysis of the V observations of the δ Scuti star HR 1225 has been carried out. Two frequencies of 6.415 cd (P₀ = 0ᵈ.1558) and 8.418 cd (P₁ = 0ᵈ.1188) have been determined. The period ratio of P₁/P₀ = 0.762 ...
  • On the observations of multiple MHD oscillations in the solar loops 
    Srivastava, A. K. (2010-05-10)
    Observations of multiple oscillations of various magnetohydrodynamic (MHD) modes may play crucial role in the diagnostics of the local plasma conditions of solar loops. Magnetically structured coronal loops anchored into ...
  • SuperWASP observations of the 2007 outburst of Comet 17P/Holmes 
    Hsieh, H. H.; Fitzsimmons, A.; Joshi, Y.; Christian, Damian; Pollacco, D. L. (2010)
    We present wide-field imaging of the 2007 outburst of Comet 17P/Holmes obtained serendipitously by SuperWASP-North on 17 nights over a 42-night period beginning on the night (2007 October 22–23) immediately prior to the ...
  • Multiwavelength study of the M8.9/3B solar flare from AR NOAA 10960 
    Kumar, P.; Srivastava, A. K.; Fillippov, B.; Uddin, W. (2010)
    We present a multiwavelength analysis of a long-duration, white-light solar flare (M8.9/3B) event that occurred on 04 June 2007 from AR NOAA 10960. The flare was observed by several spaceborne instruments, namely SOHO/MDI, ...
  • Deflection of coronal rays by remote cmes: shock wave or magnetic pressure? 
    Filippov, B.; Srivastava, A. K. (2010)
    We analyze five events of the interaction of coronal mass ejections (CMEs) with the remote coronal rays located up to 90° away from the CME as observed by the SOHO/LASCO C2 coronagraph. Using sequences of SOHO/LASCO C2 ...
  • Centre to limb variation of rotational temperature of the CH molecules in the solar photosphere 
    Pandey, M. C.; Gaur, V. P.; Bondal, K. R.; Dubey, R. C. (1980)
    Spectrophotoelectric observations of the CH lines have been presented to determine the centre-to-limb behaviour of rotational temperatures for the (0-0)and (1-1) bands of the electronic transition A²∆-X²II of the molecule. ...
  • Spectrophotometric determination of the temperature of the cepheid SU Cassiopeiae 
    Joshi, S. C.; Rautela, B. S. (1980)
    The effective temperature of the short period cepheid SU Cas has been determined from a comparison of its spectral scans with appropriate model atmospheres. Using this temperature and an independent Wesselink radius ...
  • Periodogram analysis of the light curves of 59 Aurgae 
    Gupta, S. K. (1980)
    The photoelectric V observations of the δ Scuti star 59 Aur have been analysed using the techniques of periodogram analysis and least-squares solutions. The fundamental mode is found to be more prominent than the first ...
  • Ionized Molecules in facula models 
    Tripathi, B. M.; Gaur, V. P.; Pande, M. C. (1981)
    Equivalent widths for the lines of ionized molecules A1H⁺, CH⁺, CN⁺, CO⁺, MgH⁺, N2⁺, NH⁺, OH⁺ and SiH⁺ have been calculated in five facular and two photospheric models. The calculations suggest that CH⁺ should show up in ...

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