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Browsing by Author "Ashoka, B. N."

Browsing by Author "Ashoka, B. N."

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  • Detection of new short period oscillations in PG 1711+336 (V795 HER) 
    Ashoka, B. N.; Seetha, S.; Marar, T. M. K.; Padmini, V. N.; Kasturirangan, K.; Rao, U. R.; Pande, M. C.; Mahra, H. S. (1989)
    Long period light variations of the cataclysmic variables PG 1711+336 (V795 Her) were first noticed by Mironov et al. (1983 a,b) who reported a photometric period of 0.115883 day for the system. Baidak et al., (1985) ...
  • Development of a three channel photometer for UPSO, Naini Tal 
    Ashoka, B. N.; Kumar; Babu, V. C.; Seetha, S.; Girish, V.; Gupta, S. K.; Sagar, R.; Joshi, S.; Narang, P. (2001)
    The design and performance of a portable three channel photometer installed at the Uttar Pradesh State Observatory (UPSO), NainiTal is described. The photometer is modular and the whole unit can be disassembled as individual ...
  • 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. (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 ...
  • Discovery of pulsations in the Am star HD 13079 
    Martinez, P.; Kurtz, D. W.; Ashoka, B. N.; Chaubey, U. S.; Gupta, S. K.; Leone, F.; Catanzaro, G.; Sagar, R.; Raj, E.; Seetha, S.; Kasturirangan, K. (1999)
    Pulsation in cool main-sequence Am stars is a rare phenomenon observed in a few marginal Am stars and only one classical Am star. The chemically peculiar star HD 13079 is shown to be pulsating with a 78-min period and a ...
  • Discovery of unusual pulsations in the cool, evolved Am stars HD 98851 and HD 102480 
    Joshi, S.; Girish, V.; Sagar, R.; Kurtz, D. W.; Martinez, P.; Kumar, B.; Seetha, S.; Ashoka, B. N.; Zhou, A. (2003)
    The chemically peculiar (CP) stars HD 98851 and HD 102480 have been discovered to be unusual pulsators during the ‘Naini Tal–Cape Survey’ programme to search for pulsational variability in CP stars. Time series photometric ...
  • 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. (2001)
    The rapidly oscillating Ap (roAp) stars are cool, magnetic, chemically peculiar stars which in non-radial p-modes in the period range 4-16 min and have Johnson B amplitudes less than 8 mmag. “The Naini Tal – Cape survey” ...
  • HD 12098 – A new northern hemisphere roAp star 
    Girish, V.; Seetha, S.; Martinez, P.; Joshi, S.; Ashoka, B. N.; Kurtz, D. W.; Chaubey, U. S.; Gupta, S. K.; Sagar, R. (2001)
    We present the analysis of 65 hours of high speed photometric observations of HD 12098 taken from State Observatory, Naini Tal and Gurushikhar Observatory, Mt. Abu on sixteen nights spanning from November 1999 to November ...
  • 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. (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 ...
  • The Naini Tal – Cape survey for pulsations in chemically peculiar A-type stars 
    Martinez, P.; Kurtz, D. W.; Ashoka, B. N.; Chaubey, U. S.; Girish, V.; Gupta, S. K.; Joshi, S.; Kasturirangan, K.; Sagar, R.; Seetha, S. (2001)
    New survey for pulsating, chemically peculiar A- and F-type stars in the northern hemisphere has been initiated using the 1-m telescope at Uttar Pradesh State Observatory in Naini Tal. The survey is primarily structured ...
  • The Nainital-Cape Survey : Report for pulsation in five chemically peculiar A-type stars and presentation of 140 null results 
    Joshi, S.; Mary, D. L.; Martinez, P.; Kurtz, D. W.; Girshi, V.; Seetha, S.; Sagar, R.; Ashoka, B. N. (2006)
    We search for photometric variability in chemically peculiar A type stars in the northern hemisphere. High-speed photometric observations of Ap and Am star candidates have been carried out from ARIES (Manora ...
  • 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. (2002)
    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. ...
  • UPSO three channel fast photometer 
    Gupta, S. K.; Sagar, R.; Joshi, S.; Ashoka, B. N.; Babu, V. C.; Seetha, S.; Girish, V. (2001)
    The design and performance of a modular portable three channel fast photometer is described. It can be disassembled as single individual channels such that the system can also be used as a single channel photometer. The ...

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