Research Papers: Recent submissions

  • Spectrophotometry of peculiar shell star HD 218393 
    Goraya, P. S.; Singh, M.; Chaubey, U. S. (1984)
    HD 218393 is a well known shell star having several interesting spectral features. Struve (1944), Merrill (1949), Holliday (1950) and Doazan and Peton (1970) observed this star spectroscopically and noticed a series ...
  • On the recurrence of sudden ionospheric disturbances 
    Shelke, R. N.; Pande, M. C. (1984)
    Recurrence tendency of maximum sudden ionospheric disturbances (SIDs) has been investigated using power spectrum analysis. The power spectrum obtained shows that most significant power appears at the frequencies of 0.03703, ...
  • Photometry of open cluster King 21 
    Mohan, V.; Pandey, A. K. (1984)
    Photoelectric magnitudes of 26 in the field of King 21 have been obtained. The reddening is variable across the cluster. A distance of 1.91 kpc has been estimated for the cluster. It is concluded that the age of the cluster ...
  • HD91948: a new probable Be star 
    Goraya, P. S.; Padalia, T. D. (1984)
    Gorga (1971) investigated the binary nature of the star HD 91948 (=BD+60d 1274 = SAO 15243; F8V). He found it to be a spectroscopic binary with an orbital period of 2.7700266d. The first photoelectric (UBV) observations ...
  • Centre-to-limb behaviour of molecular rotational temperatures III 
    Sinha, K. (1984)
    Utilizing the KPNO altas (Brault & Teserman 1972) for the (0-0) band of the Swan system of the C₂ molecules, we determine rotational temperatures Trot, for µ = 1.0 and µ = 0.2. When saturation in the observed equivalent ...
  • Molecular emission from the head of comet P/Crommelin 1818 I 
    Goraya, P. S.; Rautela, B. S.; Sanwal, B. B. (1984)
    The comet P/Crommelin has attracted the attention of a larga of scientists during its recent apparition in 1984 February. During its earlier returns (in 1818, 1873, 1928, and 1956) the motion of Comet Crommelin holds the ...
  • Shell episode of Pleione (BU Tau) 
    Goraya, P. S. (1984)
    Pleione is a well known shell star in the Pleiades cluster (HD 23862, m_v = 5.20, Sp.Type B8Vn + shell according to Abt and Levato (1978)). Its photometric variability was investigated by Sharov and Lyuty (1976) who ...
  • Spectrophotometry of comet Austin (1982g) during post perihelion period 
    Goraya, P. S.; Rautela, B. S.; Sanwal, B. B. (1984)
    Spectrum scans have been obtained of the head of Comet Austin on six nights at heliocentric distances (r) from 0.70 to 0.87 AU. The useful spectral region is λλ330-750 nm. Strong emission features of CN (388nm) and Swan ...
  • Mass transfer in AR Lacertae 
    Srivastava, R. K. (1984)
    Evolutionary discussion shows that the possibility of AR Lac being in a semi-detached state of evolution cannot be ruled out. The period variations of AR Lac have been analysed using Biermann & Hall's (1973) model for a ...
  • On the oscillator strengths of the Phillips bands 
    Sinha, K. (1984)
    The recently published values of oscillator strengths for the Phillips bands were checked with those obtained from the solar spectrum. The results of (1982) Erman et al. based on the assumption of a varying electronic ...
  • Duration distributions for different softness groups of gamma-ray bursts 
    YiPing, Q.; Gupta, A. C.; JunHui, F.; ChengYue, S.; RuiJing, L. (2010-07)
    Gamma-ray bursts (GRBs) are divided into two classes according to their durations. We investigate if the softness of bursts plays a role in the conventional classification of the objects. We employ the BATSE (Burst and ...
  • UBV photometry of two eclipsing binary stars 
    Chaubey, U. S.; Singh, M. (1984)
    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 that the orbital ...
  • On the relation between large scale solar magnetic fields and filament positions 
    Shelke, R. N.; Pande, M. C. (1983)
    Interrelationships of filament positions and large scale solar magnetic field structures are examined here. The broad neutral bands seem to be suitable locations for the formations and development of filaments. Filaments ...
  • On the arch prominence of 1980 November 22 
    Pant, P.; Bondal, K. R. (1983)
    Photographic H-alpha observations of an arch prominence, its eruption and subsequent with a neighbouring prominence, taken 1980 November 22 are described. The observations were obtained with a 0.7 Å passband Halle filter. ...
  • Study of the open cluster NGC 2264 
    Sagar, R.; Joshi, U. C. (1983)
    Photoelectric UBV magnitudes and colours have been determined for 138 stars in NGC 2264, having membership probability greater than 50 per cent on the basis of proper motion studies. The reddening across the cluster is ...
  • A photoelectric hour-angle solar guider 
    Gupta, S. K. (1983)
    For studying a particular feature on the solar disc, it is necessary to keep the image of the sun fixed with respect to the instrument over the duration of the observations. However, the atmospheric refractions, irregularities ...
  • HD 34409 - a delts scuti variable 
    Srivastava, R. K.; Arya, A. K. (1983)
    The star HD 34409 (=BD + 69d315) was reported to be a variable of small amplitude by Hilditch (1971). He also reported the spectral type of HD 34409 as F2 and indicated that the light variations of the star closely ...
  • A study of the eclipsing binary XX Cas 
    Srivastava, R. K. (1983)
    UBV photometry of the eclipsing binary system XX Cas has been presented. Primary eclipse appears to be a total occultation rather than a partial transit (Pierce, 1938). A slightly improved period of 3ᵈ.0671708 has been ...
  • On the activation of a quiescent prominence 
    Verma, V. K. (1983)
    During the observations of a quiescent prominence of 1981 November 27. the prominence for activated and mass transfer to another active centre took place with an average velocity of 32 km s¯¹ along a looped path. The total ...
  • The occultation of BD - 19º4222 by Uranus on 1981 April 26 
    Mahra, H. S.; Pandey, A. K.; Joshi, U. C.; Mohan, V. (1983)
    From the observations of the occultation of BD - 19º4222 by Uranus on 1981 April 26 the temperature profiles of the Uranium upper atmosphere have been obtained. The mean temperature of the upper atmosphere of Uranus in the ...

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