Research Papers: Recent submissions

  • Photometry of the δ Scuti star HD 40372 
    Deb, S.; Tiwari, S. K.; Singh, H. P.; Seshadri, T. R.; Chaubey, U. S. (2009)
    We present B band photometry of the δ Scuti star HD 40372 using the ARIES three channel fast photometer attached to the 104-cm Sam- purnanand telescope in high-speed photometric mode. The star was observed for ~ 5 hours ...
  • Nainital Microlensing Survey – detection of short period Cepheids in the disk of M31 
    Joshi, Y. C.; Narasimha, D.; Pandey, A. K.; Sagar, R. (2010)
    Cepheids are the primary distance indicators for the external galaxies, so discovery of large number of Cepheid variables in far-off galaxies offers a unique opportunity to determine the accurate distance of the host ...
  • Integrated parameters of star clusters: a comparison of theory and observations 
    Pandey, A. K.; Sandhu, T. S.; Sagar, R.; Battinelli, P. (2010)
    This paper presents integrated magnitudes and colours for synthetic clusters. The integrated parameters have been obtained for the whole cluster population as well as for the main-sequence (MS) population of star clusters. ...
  • Polarization towards the young open cluster NGC 6823 
    Medhi, B. J.; Maheswar, G.; Pandey, J. C.; Tamura, M.; Sagar, R. (2010)
    We present multiwavelength linear polarimetric observations of 104 stars towards the region of young open cluster NGC 6823. The polarization towards NGC 6823 is dominated by foreground dust grains and we found evidence ...
  • Spectrophotometry of comet Bradfield (1980t) during post-perihelion period 
    Goraya, P. S.; Sinha, B. K.; Chaubey, U. S.; Sanwal, B. B. (1982)
    Spectrum scans of the head of comet Bradfield (1980t) covering the wavelength range λ λ365-640 nm were made on two nights when the heliocentric distance of the comet varied from 0.55 to 0.58 AU. The emission features of ...
  • Photometric elements and evolutionary status of eclipsing binary DI Pegasi 
    Chaubey, U. S. (1982)
    The light curves of eclipsing binary DI Pegasi in U, B and V filters have been [resented and discussed. Photometric elements of the system have been determined. Using the colour indices, we estimate absolute dimensions and ...
  • Brackett-gamma line and facula models 
    Tripathi, B. M.; Pandey, M. C. (1981)
    An attempt has been made to show that the profile of the bracket-gamma line can distinguish between different facula models. It is suggested that low noise high resolution scans of Brackett lines can help improve the ...
  • On the MgH oscillator strengths 
    Sinha, K. (1981)
    The theoretical estimates of the oscillator strengths by Kirby, Saxon and Liu(1979) for the A II² - X Ʃ² system of the MgH molecule are compared with the solar photospheric results. It is found that the two results are in ...
  • A new Cepheid variable, HD 200925 
    Padalia, T. D.; Gupta, S. K. (1982)
    Photoelectric observations of the star HD 200925 in the standard UBV system have been secured and analyzed. The period is determined to be 0. ͩ 267394. From the period and shape of the light and colur curves, the star HD ...
  • Application of lightning discharge generated radio atmospherics/tweeks in lower ionospheric plasma diagnostics 
    Maurya, A. K.; Singh, R.; Veenadhari, B.; Pant, P.; Singh, A. K. (2010)
    Lightning discharges during thunderstorm are the significant natural source of electromagnetic waves. They generate electromagnetic pulses, which vary from few Hz to tens of MHz, but the maximum radiated energy is confined ...
  • Short term optical variability of blazars: first results from joint international collaborations 
    Semkov, E., ... et al. (Including Gupta, A. C. & Rani, B. and Gaur, H.) (2010)
    We present some preliminary results from optical monitoring of blazars as a part of joint WEBT campaigns and Indo-Bulgarian collaboration.
  • Loss of orbital angular momentum and changes in Algols 
    Chaubey, U. S. (1984)
    The observational data of Algols have been examined in order to clarify the implication of the assumption concerning the orbital angular momentum loss on their orbital period change. It is found that the agreement between ...
  • Variable line strengths of star HD 50896 
    Singh, M. (1984)
    Wolf-Rayet stars from a distinct class of stellar objects and have spectra in which emission lines of either nitrogen and helium predominate (WN) or else emission lines of helium, carbon and oxygen predominate (WC). ...
  • Ca II H and K and Hα emission variability in AR Lacerate 
    Goraya, P. S.; Srivastava, R. K. (1984)
    AE Lac (=BD + 45°3813) is a well known RS CVn type eclipsing binary system. Many interesting phenomena are associated with the system such as light curve variations, star spots and radio flares. Many investigators found ...
  • Infrared photometric studies of Be stars 
    Ashok, N. M.; Bhatt, H. C.; Kulkarni, P. V.; Joshi, S. C. (1984)
    The Be stars as a class have been studied. JHK (1.2, 1.65, 2.2 μm) magnitudes for 55 Be stars are presented along with L (3.5 μm) magnitudes for 15 of them. For 20 Be stars the observations it is shown that the energy input ...
  • Association of coronal holes with large scale solar magnetic fields 
    Shelke, R. N.; Pande, M. C. (1984)
    Association of coronal holes with large scale solar magnetic fields has been investigated. It is concluded that coronal holes always form in the large unipolar magnetic field patterns, and no specific polarity rule holds ...
  • Evolutionary processes in close binary stars 
    Chaubey, U. S. (1984)
    The evolutionary processes of close binary stars have been examined. It is found that there is a strong deficit of binaries evolving in Case A in the whole mass range. Probably the binary stars having binary separation ...
  • The occultation of MKE 31 by Neptune on September 12, 1983 
    Pandey, A. K.; Mahra, H. S.; Mohan, V. (1984)
    The predicted occultation of the star No. 31 (Mink et al., 1981) by Neptune on September 12, 1983 was observed photoelectrically. Four secondary occultations were recorded before the immersion event.
  • Photometry of open cluster King 12 
    Mohan, V.; Pandey, A. K. (1984)
    Photoelectric magnitudes of 30 stars in the field of King 12 have been obtained. The reddening is variable across the cluster. A distance of 2.49 kiloparsecs has been estimated for the cluster. It is concluded that the age ...
  • Distribution of absolute of bright Be stars in Pleiades 
    Goraya, P. S. (1984)
    We present newly measured energy distribution from λλ3200-7500Å of five late-type Be stars in Pleiades cluster for search of peculiarities of Be stars continuum energy distributions. Empirical effective temperatures of Be ...

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