Research Papers: Recent submissions

  • On the solar oscillator strength of SiH⁺ 
    Trivedi, C.; Sinha, K. (1997)
    Rather contrasting values of the oscillator strengths for the (0,0) band of SiH⁺ molecules for the A ¹II – X¹ ∑⁺ transition have been reported in the literature. We investigate these with the help of a new set of solar ...
  • Solar log gf values for the spectral lines in the range λλ 6209-6273 Å 
    Stalin, C. S.; Sinha, K.; Sanwal, B. B. (1997)
    Utilizing Liege solar atlas and solar photospheric models, we derived log gf values for the spectral lines in the wavelength range λλ 6209-6273 Å. These values, intended for use in a future study of a high resolution reticon ...
  • Stellar contents of the open clusters Be 64 and Be 69 
    Pandey, A. K.; Durgapal, A. K.; Bhatt, B. C.; Mohan, V.; Mahra, H. S. (1997)
    We present U BV RI CCD photometry for previously unstudied open clusters (Be 64 and Be 69). Photometry has also been carried out for nearby fields to correct for the effects of field stars contamination. From the ...
  • The Nainital-Cape Survey: III. A search for pulsational variability in chemically peculiar stars 
    Joshi, S.; Mary, D. L.; Chakradhari, N. K.; Tiwari, S. K.; Billaud, C. (2009)
    The Nainital-Cape survey is a dedicated research programme to search for and study the pulsational variability in chemically peculiar stars in the Northern Hemisphere. The aim of the survey is to search for such chemically ...
  • Photometric flash-light observations of SL9 impact on Jupiter 
    Srivastava, R. K.; Padalia, T. D.; Mahra, H. S. (1997)
    The effects of SL9 impact on Jupiter has been assessed by observing flash-light effect on the nearest satellites of Jupiter, the Io, on 21 July, 1994. The observations in V filter of flash-light effect on Io suggest a ...
  • CCD photometry of galactic open star clusters – V. King 7 
    Durgapal, A. K.; Pandey, A. K.; Mohan, V. (1997)
    CCD observations of the open clusters King 7 and two nearby fields have been made in the UBVRI passbands down to V ~ 20.0 mag. From the colour-colour diagram the reddening is estimated to be 1.25 mag. Comparison of the ...
  • Eruption of twisted filament, associated flare and transient phenomena 
    Uddin, W.; Verma, V. K. (1998)
    In this paper we present CCD observations between 14th to 20th Feb. 1994 and analysis of the giant twisted filament evolved in the active region NOAA 7671. The dynamic eruption of the filament accompanied by major flare ...
  • The age of the Galactic Globular Clusters 
    Sagar, R. (1997)
    The Galactic globular clusters are believed to be among the most ancient objects for which reliable ages can be determined. As the Universe can not be younger than the oldest object it contains, the oldest Galactic globular ...
  • Proposed microthermal measurements at Devasthal 
    Pant, P.; Sagar, R. (1998)
    For evaluating the optical quality of the Devasthal site, it is proposed to set-up a potential viable instrument for detecting the microthermal fluctuations introducted by the atmospheric turbulence. The details of the ...
  • CCD photometry of the galactic open cluster NGC 2309 
    Nilakshi; Pandey, A. K.; Mohan, V. (1998)
    The comparison between the observed HR diagram of the clusters and the isochrones computed by means of evolutionary models provides a test for stellar structure and evolution. To get fundamental information for above ...
  • GRB 041015 R band observations 
    Pandey, S. B.; Misra, K. (2004)
    We observed the GRB 041015 field (integral trigger 2019) with 1.04-m reflector at ARIES Nainital, starting at Oct 15.6424 UT. Co-added R_c frame (2 x 900 sec) did not reveal any new source within eror-box upto - 20 mag, ...
  • GRB 041006 optical afterglow observations 
    Pandey, S. B.; Misra, K. (2004)
    We observed several R_c band frames of the GRB 041006 optical afterglow, determined the magnitudes in comparison with the stars A and B as reported in GCN 2792 using 1.04-m telescope of ARIES Nainital India. The OT decayed ...
  • GRB 040403 optical observations 
    Mishra, K. (2004)
    We observed the error circle of integral GRB 040403 (Gotz et al., GCN 2560) in R band, with 1.0-m telescope at Nainital (India) on April 03, 2004 starting at 16:44 UT. We found no new source brighter than R - 19.5 when ...
  • Spectrometric study of comet C/1996 B2 Hyakutake 
    Singh, M.; Sanwal, B. B. (1998)
    The spectrometric observations of Comet C/1996 B2 Hyakutake were taken on six nights at its closest approach (March 23-April 09, 1996), with 104 cm telescope of the Naini Tal Observatory, using EG&G Spectrograph coupled ...
  • Neglected binaries of special interest 
    Srivastava, R. K. (1998)
    Some binaries of special interest, observed at Uttar Pradesh State Observatory, Naini Tal, have been presented in this communication. Some of these binaries, although sufficiently bright, have not yet been investigated ...
  • Proposed 60-cm multichannel Solar Vacuum Telescope of UPSO, Nainital 
    Verma, V. K.; Uddin, W.; Gaur, V. P. (1998)
    The proposed Solar Vacuum Telescope (SVT) having equatorial mount will be equipped with 60 cm (f/15) vacuum Gregorian tube, 35-cm vacuum reflector tube and two 15-cm refractor telescopes. The SVT will consist of: (1)60-cm ...
  • Absolute energy distribution studies in stars and comets 
    Sanwal, B. B.; Rautela, B. S. (1998)
    Through the visible window of the earth's atmosphere, we measured portions of stellar continuum of six classical cepheids and a few Be stars, using a Hilger and Watts spectrum scanner at the Cassegrain focus of the one ...
  • Close binary stars with moderate size optical telescopes 
    Chaubey, U. S. (1998)
    We discuss here the role of moderate size optical telescope in the studies of the evolution of close binary stars. The informations about the structure and evolution of the close binary star DI Pegasi, extracted from its ...
  • CCD photometry of the open cluster King 5 
    Durgapal, A. K.; Pandey, A. K.; Mohan, V. (1998)
    We are presenting photometric data of previously unstudied open cluster King 5. The UBVRI CCD photometric observations of stars in the field of King 5 have been used to study the fundamentals parameters such as interstellar ...
  • BVI CCD photometry of the distant open star clusters Berkeley 81, Berkeley 99, NGC 6603 and NGC 7044 
    Sagar, R.; Griffiths, W. K. (1998)
    We present CCD observations for the distant northern open star clusters Berkeley 81, Berkeley 99, NGC 6603 and NGC 7044 in B, V and I photometric passbands. A total of 9900 stars have been observed in fields of about 6 ...

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