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Browsing by Author "Chaubey, U. S"

Browsing by Author "Chaubey, U. S"

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  • Close binary stars with moderate size optical telescope 
    Chaubey, U. S (Astronomical Society of India, 1998)
  • Discovery of pulsations in HD 98851 
    Joshi, S; Girish, V; Martinez, P; Sagar, R; Ashoka, B. N; Gupta, S. K; Seetha, S; Chaubey, U. S; Kurtz, D. W (Astronomical Society of India, 2001)
    Using the UPSO 1-m Sampurnanand reflector telescope equipped with a fast photometer, we observed the chemically peculiar (CP) star HD 98851 for a total of around 30 hours on 5 different nights between January to April 2000. ...
  • Eclipsing binary research at Uttar Pradesh State Observatory 
    Srivastava, J. B; Chaubey, U. S; Pande, M. C (Astronomical Society of India, 1990)
    The results of photometric and spectroscopic studies of binary stars at Uttar Pradesh State Observatory are summarized. The star names, their magnitudes and periods, and their orbital elements are given. Findings on the ...
  • HD 12098 a new far-northern roAp star 
    Girish, V; Joshi, S; Seetha, S; Ashoka, B. N; Martinez, P; Chaubey, U. S; Gupta, S. K; Kurtz, D. W; Sagar, R (Astronomical Society of India, 2001)
    The rapidly oscillating Ap (roAp) stars are cool, magnetic, chemically peculiar stars which pulsate in non-radial p-modes in the period range 4-16 min and have Johnson B amplitudes less than 8 mmag. "The NainiTal-Cape ...
  • Mass transfer in ALGOLS and its implications to the mass transfer theory 
    Chaubey, U. S (Astronomical Society of India, 1993)
    he average mass transfer rates in four Algol-type binary stars RZ Cas, TV Cas, SW Cyg and DI Peg are derived from their observed period changes in the light of alternate period change model. The results have been used to ...
  • Naini Tal-Cape survey for pulsating chemically peculiar stars - A status report 
    Seetha, S; Chaubey, U. S; Girish, V; Joshi, S; Ashoka, B. N; Gupta, S. K; Kurtz, D. W; Martinez, P; Sagar, R (Astronomical Society of India, 2001)
    The "Naini Tal-Cape survey for rapidly oscillating Ap stars", to search the northern hemi-sphere sky for pulsating stars was initiated in 1997. This is a collaboration between India and South Africa. So far about 70 stars ...
  • New pulsating variables discovered from the Naini Tal-Cape survey 
    Seetha, S; Ashoka, B. N; Joshi, S; Girish, V; Sagar, R; Chaubey, U. S; Gupta, S. K (Astronomical Society of India, 2002-09)
    The Naini Tal-Cape survey has been initiated to search for pulsations in chemically peculiar A and F type stars. Many of the magnetic A peculiar type stars exhibit rapid oscillations with periods ranging from 4-16 minutes. ...
  • On the magnitude variations of comet Swift-Tuttle (1992t) 
    Padalia, T. D; Gupta, S. K; Chaubey, U. S; Srivastava, R. K (Astronomical Society of India, 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.
  • Revised elements and Evolutionary status of six eclipsing binary stars 
    Chaubey, U. S (Astronomical Society of India, 1984-09)
    Twelve photoelectric light curves of six eclipsing binary stars namely GG Cas, WX Cep, UZ Cyg, AQ Peg and ST Per in two different filetrs (B and V for the first five binaries and R and I for ST Per) have been analysed by ...
  • Site characterization for the UPSO-TIFR telescope 
    Sagar, R; Uddin, W; Pandey, A. K; Stalin, C. S; Mohan, V; Sanwal, B. B; Gupta, S. K; Yadav, R. K. S; Durgapal, A. K; Joshi, S; Kumar, B; Gupta, A. C; Joshi, Y; Srivastava, J. B; Chaubey, U. S; Singh, M; Pant, P; Gupta, K. G; Padalia, T. D (Astronomical Society of India, 2000)
    The Uttar Pradesh State Observatory, Naini Tal and Tata Institute of Fundamental Research, Mumbai plan to install jointly a 3 metre size optical telescope at Devasthal located east of Naini Tal about 50 km by road. The ...
  • Spectrophotometry of RZ CAS 
    Chaubey, U. S (Astronomical Society of India, 1996)
    Spectrum scans of the eclipsing binary star RZ Cas at different phases in the wavelength range λλ 3300 - 7600 Amstrong taken through Hilger and Watts monochromator equipped with 104-cm telescope of Uttar Pradesh State ...
  • Survey for roAp stars in the northern sky from Naini Tal 
    Ashoka, B. N; Seetha, S; Raj, E; Chaubey, U. S; Gupta, S. K; Joshi, S; Martinez, P; Kurtz, D. W; Sagar, R; Kasturirangan, K (Astronomical Society of India, 2000)
    Of the 31 known rapidly oscillating Ap (roAp) stars, 28 are in the southern sky and majority of them were discovered at SAAO indicating that a systematic survey also is needed in the northern sky. Therefore, a project has ...
  • UBV photometry of comet Swift-Tuttle (1992t) 
    Padalia, T. D; Gupta, S. K; Srivastava, R. K; Chaubey, U. S (Astronomical Society of India, 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 center of the cometary head have been given. On the night of 17 ...
  • UBV photometry of two eclipsing binary stars 
    Chaubey, U. S; Singh, Mahendra (Astronomical Society of India, 1984-03)
    UBV light curves of the eclipsing binary systems V364 Cas and MM Cas are presented. A total of eight photoelectric times of minimum light for these stars were derived. The UBV photometric data of V364 Cas show that the ...

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