Research Papers: Recent submissions

  • Photometric study of MM Cas 
    Chaubey, U. S. (1992)
    The U, B and V photometry observations of the eclipsing binary MM Cas have been presented and discussed. The photometry elements have been derived. By use of the colour indices U – B and B – V, the spectral types of the ...
  • Equilibrium constants of the molecular ion H₃⁺ 
    Gaur, V. P.; Pande, M. C.; Chandra, S. (1992)
    The H₃⁺ molecular ion plays an important role int he chemistry of astronomical objects as it protonates the neutral species. The authors have recently calculated the partition functions of H₃⁺ which may be used to compute ...
  • Evolution of sunspots seen in molecular lines. I 
    Sinha, K.; Tripathi, B. M. (1991)
    With a view to asses the role of changing magnetic field strengths on line intensities, the results of equivalent width calculations of some lines of C₂, MgH and TiO molecules are presented here for standard photospheric ...
  • Evolution of sunspots seen in molecular lines. Ⅱ 
    Sinha, K.; Tripathi, B. M. (1991)
    Utilizing the model atmospheres proposed by Sobotka for umbrae of different sizes and those proposed by Maltby et al. for well-developed umbrae, at diffrent phased of solar activity, we examine themolecules C₂, MgH and TiO ...
  • Spectrophotometric observations of B type stars HR 1207 and HR 1770 
    Joshi, S. C.; Ojha, D. K. (1991)
    Two high rotational velocity B type stars HR 1207 and HR 1770 have been observed spectrophotometrically. The energy distribution curves of the stars have been compared with model atmospheres in the ultraviolet and visible ...
  • Uttar Pradesh State Observatory: report for the period 1987 January 1 - 1989 December 31 
    UPSO (1991)
    Report of the Uttar Prades State Observatory (1 January 1987 to 31 December 1989)
  • Photometric performance of UPSO CCD system 
    Mohan, V.; Paliwal, D. C.; Mahra, H. S. (1991)
    The UBVRI photometric calibration of the CCD camera of the UP State Observatory, Naini Tal, is given here. This is based on the observations of photometric standards located near equatorial regions as well as in the open ...
  • The growth of publications of the Astronomical Society of India 
    Gupta, S. K.; Sinha, K. (1991)
    Research papers published in the Bulletin of the Astronomical Society of India during the 17 years period since its inception in 1973 to 1989 have been examined with a view to discern the publication trends. It is pointed ...
  • A magnitude, colour, and proper-motion probe of the Galaxy at an intermediate galactic latitude 
    Bienayme, O.; Mohan, V.; Creze, M.; Considere, S.; Robin, A. C. (1992)
    A sample survey is being conducted in UBV photometry and proper motions as part of an investigation of galactic structure and evolution. In the present paper we discuss the observational results in a restricted field (1.78 ...
  • The radial structure of the galactic disc 
    Robin, A. C.; Creze, M.; Mohan, V. (1992)
    Three colour photometry on CCD frames in the Special Ares SpA23 provides a deep probe of the galactic disc in a low absorption window towards the anticenter. Magnitudes to better than 10% at V = 25 and B – V colour down ...
  • The edge of the galactic disk 
    Robin, A. C.; Creze, M.; Mohan, V. (1992)
    As part of a stellar population sampling program, a series of photometric probes at various field sizes and depths have been obtained in a low-extinction window in the Galactic anticenter direction. Such data set strong ...
  • Spectrophotometric study of comet Austin (1989C1) 
    Rautela, B. S.; Sanwal, B. B. (1992)
    Spectrophotometric observations of the head of comet Austin (1989C1) during five nights in May 1990 are presented. Emission bands due to CN, C₂ and C₃ molecules have been identified. An estimate of their column densities ...
  • Spectrophotometry of comet Levy (1990C) 
    Rautela, B. S.; Sanwal, B. B. (1992)
    Two spectrophotometric scans of comet Levy (1990c) have been analysed to estimate Haser model column densities and production rates of CN and C₂ molecules.
  • A possible presence of He H+ in white dwarfs 
    Gaur, V. P.; Joshi, G. C.; Pande, M. C. (1992)
    In equivalent width calculations for the fundamental vibration rotation band lines of He H+ have been carried out for a non-DA white dwarf model with an effective temperature of 12000 k. Both P and R branch line with ...
  • On the north-south asymmetry of solar activity cycles 
    Verma, V. K. (1993-02-01)
    We report a study of various solar phenomena occurring in both northern and southern hemispheres of the sun for solar cycles 8-22. We have calculated the N-S asymmetry indices for several solar phenomena and plotted them ...
  • On the solar abundance of iron 
    Sinha, K.; Sanwal, B. B. (1992)
    Utilizing the MACKKL photospheric model and the latest oscillator strengths, solar abundances of iron close to the meteoritic value N(Fe) = 7.51 ± 0.01 is obtained. It helps to remove the discrepancy between photospheric ...
  • CCD photometry of the galactic open star cluster-II. NGC 7419 
    Bhatt, B. C.; Pandey, A. K.; Mohan, V.; Mahra, H. S.; Paliwal, D. C. (1992)
    CCD photometric observations of open cluster NGC 7419 in UBVRI passbands have been made down to V= 19.5 mag. Reddening across the cluster region is found to be variable. The mean visual absorption of 5.30 mag and a distance ...
  • Gravitational radiation and spiralling time of close binary systems (V) 
    Padalia, T. D. (1992)
    Forty-six binary systems with their primary component masses between 2 M☉ and M☉ have been considered for gravitational radiation study. Power output by gravitational radiation (Pв) and spiral τ0 for all individual systems ...
  • CCD photometry of the galactic open star cluster-I. King 10 
    Mohan, V.; Pandey, A. K.; Paliwal, D. C.; Sagar, R.; Mahra, H. S. (1992)
    CCD photometry of the open cluster King 10 has been carried out in the UBVRI photometric passbands down to V~ 19.5 mag. The reddening for the cluster region is found to be variable. A distance of 3.2 kpc has been estimated ...
  • Effect of mass segregation on mass function of young open clusters 
    Pandey, A. K.; Mahra, H. S.; Sagar, R. (1992)
    The effect of mass segregation on cluster mass function has been studied and it is found that the slope of the mass function is steeper in the outer part of the open clusters. Since derived dynamical relaxation time is ...

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