Research Papers: Recent submissions

  • Scanner observations of the Be Stars ν Gem, k Ori, β Mon and ω CMa 
    Goraya, P. S. (1981)
    The photoelectric spectrophotometric scans of the Be stars v Gem, k Ori, β Mon and CMa have been analyzed to find out few stellar parameters. The absolute energy distributions of these stars in the wavelength range λλ ...
  • Photoelectric Observations of VZ Cas 
    Srivastava, J. B.; Kandpal, C. D. (1981)
    VZ Cas is a Mira-type variable star with a period of 169.28d. The spectral type of the star is M0e-M3e. The magnitude is 9.3m - 13.3m (Kukarkin et al., 1976). The star VZ Cas was observed as comparison for the ...
  • Study of the galactic culuster NGC 6823 
    Sagar, R.; Joshi, U. C. (1981)
    Photoelectric UBV magnitudes have been determined for 41 stars in NGC 6823. The reddening across the cluster field is determined and found that it varies from E(B-V)= 0.60 to 1.16 mag. The true distance modulus to the ...
  • A note on BZ Eridani 
    Srivastava, R. K. (1981)
    In this communication, first photoelectric photometry of the system BZ Eridani in three colours and some tentative results have been presented. Observations were carried out through the 38-cm reflector, employing ...
  • Period of delta ceti 
    Mohan,V. (1981)
    A period analysis of δ Ceti has been carried out and it has been found that the period of δ Ceti is increasing at a rate of 0.86s per century. It is concluded that in its post-Main-Sequence evolution δ Ceti is in the early ...
  • UBV photometry of RT Persei 
    Sanwal, B. B.; Chaubey, U. S. (1980)
    Photoelectric and absolute elements of the system RT per have been determined in U,B, and V filters. It is suggested that the primary star may be surrounded by a gascous disk.
  • Photo electric Elements of AR Lac. UBV Photometry of Rt persei 
    Srivastava, J. B. (1980)
    Geometrical element of the system AR Lacertae have been obtained and its colour has has been discussed.The absolute dimensions have been obtained on the basis of the spectroscopic elements given by Sanford (1951).The primary ...
  • An analysis of the atmosphere of T volupeculae 
    Rautela, B. B. (1981)
    Ten spectrograms of T Vul at a dispersion of 8.47Å mm-¹ have been used for an analysis of the parameters of stellar atmosphere during its pulsation cycle. A differential curve of growth method relative to the Sun has ...
  • Eclipsing binary system AV hydrae 
    Srivastava, J. B.; Kandpal, C. D. (1981)
    The eclipsing binary AV Hya has been observed photoelectrically in U, B and V filters on 15 nights. The primary eclipse appeared to be total with a totality of 23 min duration. A modified period of 0.6 834 062 has been ...
  • Scanner observations of gamma cassiopeiae 
    Goraya, P. S (1980)
    The photoelectric spectrophotometric scans of ỳ Cas has been analysed to find the stellar and envelope parameters. The absolute energy distribution of ỳ Cas covering the wavelength interval λ350-700nm have been given. Its ...
  • Evolution in semi-detached binary systems 
    Chaubey, U. S. (1980)
    The evolutionary process of semi-detached binary systems is examined on the basis of non-conservation of orbital angular momentum. we conclude that the semi-detached binary systems follow type B evolution.
  • Variations in surface ozone at Nainital: A high‐altitude site in the central Himalayas 
    Kumar, R.; Naja, M.; Venkataramani, S.; Wild, O. (2010)
    Surface ozone measurements have been made for the first time at Nainital (29.37°N, 79.45°E, 1958 m amsl), a high‐altitude site in the central Himalayas, between October 2006 and December 2008. Diurnal variations in ozone ...
  • Sunspot Continuum from 1 to 10 µm and the umbral temperature models 
    Punetha, L. M.; Joshi, G. C. (1984)
    Infrared flux in Zwaan's (1974) and Boyer's (1980) sunspot models has been calculated in the wavelength range 1 to 10 µm, taking into account the molecular line haze opacity (Joshi et al. 1979). The calculations are compared ...
  • Radio pulsations associated with the solar flare of 1982 April 14 
    Pant, P.; Bondal, K. R. (1984)
    We report here the H-alpha observation of a large and complicated flare of optical class 2B Which occurred on 1982 April 14. The flare showed significant activity for several minutes prior to its impulsive phase, as evidenced ...
  • The occulation of Hyd -20º 51695 by Uranus on 1982 May 1 
    Pandey, A. K.; Mahra, H. S.; Mohan, V. (1984)
    The observe emersion event of the occulation of the star Hyd -20º51695 by Uranus on 1982 May 1 has been used to evaluate the temperature of the Uranian upper atmosphere. Assuming an isothermal atmosphere the scale height ...
  • On a peculiar type of prominence activation 
    Pant, P. (1984)
    We describe time-lapse H-alpha observations of a peculiar type of prominence activation of 1981 October 7 and its morphological behaviour. The prominence material seems to have originated from the photosphere as a huge ...
  • Centre to limb variation of CH line profile parameters 
    Punetha, L. M.; Joshi, G. C. (1984)
    Four CH line profiles at µ= 1.0 and 0.2 were Fourier transformed. They show(i) turbulent velocity εt=4.0 km s-1, and (ii)an increase in the Doppler width parameter by a factor of 1.03 in going form the centre to limb.
  • Revised elements and evolutionary status of six eclipsing binary stars 
    Chaubey, U. S. (1984)
    Twelve photoelectric light curves of six eclipsing binary stars namely GC Cas, WX Cep, UZ Cyg, VW Cyg, AQ Peg and ST Per in two different filters (B and V for the first five binaries and R and I for ST Per) have been ...
  • Model dependence of the rotational temperature of SiO in sunspots 
    Punetha, L. M.; Joshi, G. C. (1984)
    Centre-to-limb variation of the roatational temperature of the fundamental band of SiO in different sunspot models has been calculated. The possibility of using these calculations to pick up the true model on the basis of ...
  • Quasi-periodic oscillations of ~15 minutes in the optical light curve of the BL Lac S5 0716+714 
    Rani, B.; Gupta, A. C.; Joshi, U. C.; Ganesh, S.; Wiita, P. J. (2010)
    Over the course of 3 hr on 2008 December 27, we obtained optical (R band) observations of the blazar S5 0716+714 at a very fast cadence of 10 s. Using several different techniques, we find fluctuations with an approximately ...

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