Research Papers: Recent submissions

  • Emissions from the head of comet Bradfield (1978c) 
    Chaubey, U. S. (1979)
    The flux distribution in the head of comet Bradfield (1978c) during the pre-perihelion period has been obtained in the wavelength range 400-640 nm. The emission fluxes at 474 nm, 516 nm, 564 nm and 589 nm are reported. By ...
  • Intensity oscillations across the Ca II K line 
    Punetha, L. N (1974)
    Intensities at various wavelengths in the Ca II K line over a 10 minute duration time series spectra have been examined for oscillations. Three components have been observed:1) large period, ≥ 1000 second, due to the slowly ...
  • Equivalent widths of molecular lines in eta aquilae 
    Pande, M. C.; Joshi, G. C.; Bondal, K. R. (1974)
    Using dawe's model atmospheres the equivalent widths of R1 line belonging to the 0-0 band of the electronic transition B2∑+ →X2∑+ of the CN molecule were calculated for various phases of light variation in ŋAql. the ...
  • Absolute energy distribution og two δ scuti variable 
    Joshi, S. C.; Rautela, B. S. (1973)
    The absolute energy distribution of two δ sct stars β cas (HR 21)and υ UMa (HR 3888) have been given.by matching these with model atmospheres there effective temperatures,gravities,radii and masses have been estimated.
  • Energy distribution in early K-star 
    Chaturvedi, J. P.; Sinvhal, S. D. (1974)
    The spectral distribution of energy for 21 early K-star in the wavelength reason 450 nm to 750 nm at a definition of 5 nm have been obtained. A two dimensional photometric spectral classification index- system for these ...
  • Three- colour photometry of TW CAS 
    Kandpal, C. D. (1975)
    Photoelectric elements of the system TW Cas have been determined in U,B and V filters. A refined period of 1ᵈ.428 324 77 has been given though no change in period is noticed. Spectroscopic elements given by struve have ...
  • Three- colour photometry of the eclipsing binary EI cephei 
    Padalia, T. D.; Srivastava, R. K. (1975)
    The photoelectric elements of the system EI cephei have been determined U,B,V colours. The absolute dimensions have been determined and some evolutionary aspects have been discussed.A modified period of 8ᵈ.439334 has been ...
  • Three- colour photometry of GH pegasi 
    Srivastva, R. K.; Padalia, T. D. (1974)
    The geometrical element of the system GH pegasi and a slightly improved period of 2ᵈ.556136 have been given.
  • SH on the sun 
    Sinha, K.; Joshi, G. C.; Pande, M. C. (1976)
    The theoretical estimates of the abundances and intensities of the fraunhofer lines for various atomic and molecular species facilitate identification and clarify the role of blending produced by the nearby lines in the ...
  • Mulliken bands in the solar spectrum 
    Sinha, K.; Joshi, G. C. (1976)
    The lower X¹Σg state of the Phillips and of the Mulliken band system of C₂ molecule lies very close to the X¹ ³πᵤ' the lower electronic state of the Swan system observed in the photospheric spectrum.
  • Vibration rotation bands of NO in sunspots 
    Gaur, V. P. (1976)
    The equivalent widths of R1(26.5)lines,belonging to the 1-0,2-1 and 3-2 vibration bands of NO near 5.3 µm,have been computed for two different sunspot models at four positions on the disc.The computed equivalent widths in ...
  • Vibration rotation bands of SiO in sunspots 
    Gaur, V. P.; Pande, M. C.; Tripathi, B. M. (1978)
    The equivalent widths of P(51) and R(43) lines of the 1-0 and P(45) and R(56) lines of the 2-1 vibration rotation bands of SiO near 8 µm region, have computed for Zwaan's(1974) sunspots model at the centre of the disc. The ...
  • On the gamma system of nitric oxide in sunspots 
    Joshi, G. C.; Pande, M. C.; Shukla, D. S. (1978)
    With the aim of investigating the resonance system of NO,equivalent width calculation have been made for the 213.575nm,Q1(31.5)line of the 1-0 band of y-system of NO for the photospheric HSRA model,and for the line ...
  • The gap in the H-R diagram of open clusters with special reference to NGC 2169, NGC 1778 and Tr ׀ 
    Sagar, Ram; Joshi, U. C. (1978)
    The colour-magnitude diagrams of the open clusters NGG 1778 and Tr 1 indicate the presence of gaps of the rising branches of the evolving main sequence. the positions of these gaps are compared with those found in other ...
  • (A-X) system of SiO in sunspots 
    Joshi, G. C.; Punetha, L. M.; Pande, M. C. (1979)
    The calculated equivalents widths of some lines of SiO in the umbral spectrum suggest that strong lines of Si²⁸ O¹⁶ , Si²⁹ O¹⁶ , and Si³⁰ O¹⁶, may be present in the sunspot ultraviolet spectrum. We also find that between ...
  • Periodogram analysis of the light curves of 44 Tau 
    Gupta, S. K. (1979)
    The periodogram analysis of the light curves of the curves of the scuti star 44 tau(=HR 1287) has been carried out. The fundamental period of 44 Tau ,based on the epochs of maxima, is found to be 0.d144969 and the beat ...
  • Centre to limb behaviour of molecular rotational temperatures 
    Sinha, K. (1979)
    Withbroe'(1968) photospheric data on the equivalent widths of C2 lines for various positions on the solar disc have been utilized by us to determine the centre to limb behaviour of the rotational temperature.in view of ...
  • Rapid optical varability of TeV blazars 
    Gopal-Krishna; Goyal, Arti; Joshi, S.; Karthick, Chrisphin; Sagar, R.; Witta, P.J.; Anupama, G.C.; Sahu, D.K. (MNRAS, 2011-05-18)
    In this first systematic attempt to characterize the intranight optical variability (INOV) of TeVdetected blazars, we have monitored a well-defined set of nine TeV blazars on total 26 nights during 2004–10. In this R- ...
  • On the variability of the suspected beta cephei stars V351, V356, V357 Per 
    Mahra, H. S.; Mohan, V. (1979)
    Hill (1967) has listed a number of suspected Beta Cephei stars. Out of these the stars V351 Per (HD 13051), V356 Per (BD 56°473) and V357 Per (HD 13866) were put on our observing programme, in order to determine their variability.
  • Photoelectric observations of the novalike objects in vulpecula 
    Mahra, H. S.; Joshi, S. C.; Srivastava, J. B.; Dhir, S. L. (1979)
    Photoelectric observations of the novalike objects in vulpecula were obtained on several nights during the period April to June 1979, on the 104-cm reflector of the Uttar Pradesh State Observatory, using UBV filters of ...

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