Research Papers: Recent submissions

  • Quasi-periodic oscillations in the cataclysmic variable KR Aurigae 
    Singh, J.; Rao, P. V.; Agrawal, P. C.; Apparao, K. M. V.; Manchanda, R. K. M.; Sanwal, B. B.; Sarma, M. B. K. (1993)
    We represent fast photometric observations of KR aurigae, a nove-like variable, made during 1984-1988, in the B and U bands. The light curves show large-amplitude pulsations with periods in the range 480-780 s. the period ...
  • Mass transfer in algols and its implications to the mass transfer theory 
    Chaubey, U. S. (1993)
    The average mass transfer rates in four Algol-type binary stars RZ Cas, TV Cas, SW Cyg and BI Peg are derived from their observed period changes in the light of alternate period change model. The results have been used to ...
  • Relation between VLF phase deviations and solar x-ray fluxes during solar flares 
    Pant, P. (1993)
    Sudden phase anomalies (SPA’s) observed in the phase of GBR 16 kHz VLF signals during the years 1977 to 1983 have been analyzed in the light of their associated solar X-ray fluxes in the 0.5-4 Å bands. An attempt has been ...
  • On the unusual surge of 1991 November 16 
    Bondal, K. R.; Gaur, V. P.; Uddin, W.; Pande, M. C. (1994)
    An unusually 'long' surge of 'short' duration occurred in the NW region of the sun's limb on 1991 November 16, around 04 15 UT. Time-lapse photographic observations employing a Halle Hpalpha filter having a 0.5/0.7 Å ...
  • CCD imaging camera and CCD based guiding system at the 1 meter UPSO talescope 
    Sanwal, B. B. (1993)
    Two CCD imaging camera systems acquired from Photometries USA have been installed at the Cassegrain focus of 1 meter UPSO telescope. A 384х576 pixels Thomson CCD based camera system has been working since November 1989 and ...
  • Spectrophotometric observations of the comet Swift-Tuttle (1992t) 
    Sanwal, B. B.; Rautela, B. S.; Singh, M.; Srivastava, J. B. (1993)
    Periodic comet Swift-Tuttle (1992t) period 135 years was observed with 104 cm reflector of Uttar Pradesh State Observatory, Naini Tal, using OMA (Optical Multichannel Analyser) reticon array detector in the visible region ...
  • UBV photometry of comet Swift-Tuttle (1992t) 
    Padalia, T. D.; Gupta, S. K.; Srivastava, R. K.; Chaubey, U. S. (1993)
    The comet Swift-Tuttle (1992t) was observed through UBV filters during twelve nights in December 1992.Magnitude variations of six circular zones from the centre ot the cometary dead have been given. On the night of 17 ...
  • Spectroscopic study of the Be star phi persei 
    Singh, M.; Mon, M.; Kogure, T.; Suzuki, M. (1994)
    Based on a series of Coude spectra taken with the 188-cm reflector of the Okayama Astrophysical Observatory over an interval of 18 yr, the spectroscopic behavior in the Balmer and HeⅠ λ3888 lines of the binary Be star Ø ...
  • Superactive region AR 5395 of solar cycle 22 
    Joshi, A. (1993)
    During the ascending phase of solar cycle 22, the NOAA active region AR 5395 of March 1989 was responsible for a sudden jump in solar activity. The evolution of the active region during its its three successive rotations ...
  • Sudden phase anomalies during solar flares 
    Pant, P. (1994)
    The solar flared during 1977 September have been analysed in the light of their SPA effects produced in VLF signals over long propagation paths. The analysed data show an apparent linear relation between log (sec χ) and ...
  • Filter disc rotator 
    Gupta, S. K.; Nautiyal, S. L.; Negi, B. S. (1994)
    A filter disc rotator has been designed and developed in the electronics laboratory of UPSO for photometric observations. A stepper motor is used to rotate the filter disc in the forward as well as in the reverse directions. ...
  • On the detectibility of HeH⁺ in the solar photospheric spectrum 
    Sinha, K. (1994)
    In a recent publication of the Bulletin of the Astronomical Society of India, the possibility of detection of the (1-0) vibration-rotation lines of HeH⁺ molecules in the solar photospheric spectrum has been suggested. ...
  • UBV observations of the eclipsing binary FW monocerotis 
    Srivastava, J. B.; Kandpal, C. D. (1993)
    Photometric observations of FW Monocerotis in U, B, and V filter have been discussed. The depths of the primary minimum in UBV colours are 2.ᵐ63, 2.ᵐ17 and 1.ᵐ76, respectively. No variation in the period has been found and ...
  • A deep UBVRI CCD photometry of six open star clusters in the galactic anticenter region 
    Lata, S.; Pandey, A. K.; Kumar, B.; Bhatt, H.; Pace, G.; Sharma, S. (2010)
    We present deep UBVRI CCD photometry of six open star clusters situated in the Galactic anticenter region (l ∼ 120–200°). The sample includes three unstudied (Be 6, Be 77, King 17) and three partly studied open clusters (Be ...
  • Time-resolved photometric and spectroscopic analysis of the luminous Ap star HD 103498 
    Joshi, S.; Ryabchikova, T.; Kochukhow, O.; Sachkov, M.; Tiwari, S. K.; Chakradhari, N. K.; Piskunov, N. (2010)
    We present the results of the photometric and spectroscopic monitoring of the luminous Ap star HD103498. The time-series photometric observations were carried out on 17 nights using a three-channel fast photometer attached ...
  • Spectrophotometric study of the comet P/Swift-Tuttle (1992t) 
    Sanwal, B. B.; Rautela, B. S.; Singh, M.; Srivastava, J. B. (1994)
    Spectrophotometric observations of the periodic comet P/Swift-Tuttle (1992t) were taken through 104- cm telescope of Uttar Pradesh State Observatory Nainital, using EG & G spectrograph coupled with optical multichannel ...
  • UBV CCD standards near 5C1 radio sources at intermediate galactic latitude – I 
    Mohan, V.; Ojha, D. K.; Bienayme, O.; Paliwal, D. C.; Pandey, A. K.; Robin, A. C.; Chareton, M.; Bhatt, B. C.; Sanwal, B. B.; Oblak, E.; Haywood, M.; Creze, M. (1994)
    Using CCD observations photometric magnitudes have been obtained in 18 sub-fields in a direction at intermediate galactic latitude (l = 170°, b = 45°) in a 14 deg² area. B and V magnitudes have been obtained for a total ...
  • CCD photometry of galactic open star clusters – III. NGC 1931 
    Bhatt, B. C.; Pandey, A. K.; Mahra, H. S.; Paliwal, D. C. (1994)
    CCD photometry observations of young open cluster NGC 1931 in UBVRI passbands have been made down to 20.5 mag. The reddening across the cluster is found to be variable. The reddening varies from E(B – V)min = 0.55 mag to ...
  • On the magnitude variations of comet Swift-Tuttle (1992t) 
    Padalia, T. D.; Gupta, S. K.; Chaubey, U. S.; Srivastava, R. K. (1995)
    The standard UBV magnitudes of the head of comet Swift-Tuttle (1992t) during four nights in December 1992, are estimated using our photoelectric observations. The overall brightness variations in the comet are discussed.
  • Photographic observations of comet Swift-Tuttle (1992t) 
    Joshi, S. C.; Srivastava, J. B.; Rautela, B. S.; Sanwal, B. B. (1994)
    Positions of comet Swift-Tuttle (1992t) have been measured from photographic plates taken at the Cassegrain focus of the 104-cm telescope of Uttar Pradesh State Observatory (UPSO)

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