Research Papers: Recent submissions

  • Longitudinal distribution of the cool solar surges 
    Verma, V. K. (1984)
    This investigation shows that solar surges are poorly associated with sudden ionspheric disturbances (X-ray) implying that solar surge material is cool and does not heat the corona. The investigation also shows that surges ...
  • Continuum energy distribution of some bright Be stars 
    Goraya, P. S. (1984)
    The absolute flux distribution of seven bright Be stars, in the wavelength λλ350-750 nm is presented. The observed energy distribution curves are compared with Kurucz (1979) model atmospheres to estimate their effective ...
  • Variability of the Hα emissions in ϕ Per 
    Goraya, P. S. (1984)
    Photoelectric scans of the Be shell star ϕ Per in the Hα region have been taken to investigate the variations of Hα emission lines. Definite variations with time-scale of a few minutes have been detected. It is hoped that ...
  • Doppler width of CN lines in the sun 
    Punetha, L. M.; Joshi, G. C. (1984)
    The Doppler width of 0-1, 1-2 an 2-3 vibrational bands of the violet system of CN molecule in the solar atmosphere increase linearly with equivalent width upto ≈ 20 mÅ.
  • Coronal holes and long-lived unipolar magnetic regions 
    Shelke, R. N.; Pande, M. C. (1984)
    Association of coronal holes with long-lived unipolar magnetic regions (LLUMRs) which survived for four solar rotations is examined. It is noticed that every coronal hole fits in well within the LLUMR. The coronal holes ...
  • Flare like activity in AR Lacertae 
    Srivastava, R. K. (1983)
    The system AR Lac (=BD +45°3813 = HD 210334 = HV 2980 = HR 8448) is an interesting RS CVn binary. The system is known to e a radio sources (vide Hjellming and Blankenship, 1973; Gibson and Hiellming, 1974; Spangler et ...
  • Hα variability in alpha lyrae 
    Goraya, P. S.; Singh, M. (1983)
    Suspected variability is a valuable clue in finding new emission stars. Hα observations of bright stars with no history of line emission can lead to the discovery of hydrogen-emission stars. α Lyrae had been a well known ...
  • HD 126200 - a suspected eclipsing binary? 
    Srivastava, J. B.; Kandpal, C. D. (1984)
    The star HD 126200 (= BD+8°2857) has now been listed by Kukarkin et al. (1982) as a suspected eclipsing binary of Algol type with a variation of 0.5 magnitude based on the findings of Sanding (1951). Hirschfeld and Sinnott ...
  • Differential rotation of coronal holes 
    Shelke, R. N.; Pande, M. C. (1985)
    Using KPNO helium 10830Å synoptic charts of Carrington rotation 1716 through 1739, and by assembling a time sequence representing single latitude zone, rotational properties of coronal holes for five zones of latitudes ...
  • A photometric study of the open cluster M39 
    Mohan, V.; Sagar, R. (1985)
    Photoelectric UBV magnitudes of 50 stars in the field of M39 have been obtained for most of which previous photoelectric data were not available. These include 36 new members given by Platais (1984). The reddening for the ...
  • Spectrophotometric investigation of Be stars 
    Goraya, P. S.; Singh, M. (1985)
    The continuum energy distribution data of seven Be and five normal B stars have been presented in the wavelength range λλ3200-8000 Å. Empirical effective temperatures of these stars have been derived by comparing the ...
  • Photometric elements of V364 Cassiopeiae 
    Chaubey, U. S. (1984)
    The UBV photometric observations of the eclipsing binary V364 Cas have been discussed. Two sets of photometric elements, one based on the Russell and Merrill methods and the other based on Kopal's new method of the analysis ...
  • On the location of solar active longitudes 
    Shelke, R. N.; Verma, V. K. (1985)
    The longitudinal distributions of sudden ionospheric disturbances producing active regions with high flare activity and/or with at least one high energy flares particle event (PCA or GLE) have been examined. These active ...
  • Propagation of type II burst shock waves along the radial magnetic field in the solar corona 
    Shelke, R. N.; Pande, M. C. (1985)
    We present an analysis which indicates that in several cases coronal holes exist in the vicinity of the active region producing type II bursts. It is inferred that shock waves which produce type II bursts essentially along ...
  • Recent changes in the spectrum of the Be star 48 Persei 
    Goraya, P. S. (1985)
    A search of rapid and slow spectral variations of Balmer lines with time resolution from seconds, minutes, months, and years is carried out for 48 Per. In total, 40 spectral scans in the Hα and 13 spectral scans in the ...
  • Spectrophotometric study of X Persei 
    Sanwal, B. B.; Rautela, B. S.; Joshi, S. C. (1985)
    The continuum energy distribution of the emission line star X Per (o9.5III-V) has been obtained in the wavelength range 340-710 nm and has been compared with the energy distribution of α Cam in the same wavelength range. ...
  • Photometric elements of the eclipsing binary AE Cas 
    Srivastava, J. B.; Kandpal, C. D. (1984)
    The light curves and U, B, and V observations of the system AE Cas have been presented. An improved period of 0ͩ.7591215 is given on the basis of present observations. Photometric elements of the system have been obtained ...
  • Photometry of the pulsating variable HD 37819 
    Padalia, T. D. (1984)
    Comprehensive light curves of a newly discovered δ Scuti star HD 37819 in U, B and V filters have been presented and discussed. An improved period of 0ͩ.1892666 has been obtained. The colours and physical parameters have ...
  • Photometric study of the eclipsing binary system AR Lacertae 
    Srivastava, R. K. (1984)
    The geometrical elements of the eclipsing binary system AR Lacertae have been obtained by Fourier analysis of the light changes in the frequently-domain which was developed by Kopal (1975 a, b, c, d, e) and compared with ...
  • Spectrophotometry of bright Be stars 
    Goraya, P. S. (1985)
    We present new measurement of the distribution of energy in the continuum for eight Be stars in the optical region (λλ3200-7600Å). The effective temperatures of these stars have been estimated from their observed fluxes. ...

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