Research Papers: Recent submissions

  • On magnetic stars 
    Babu, G. S. D.; Sinvhal, S. D. (1972)
    A statistical study of magnetic stars reveals that their mean rotational velocities do not depend on their magnetic field strengths. Also that stars with low magnetic field strengths are mostly Mn stars and those with high ...
  • Intensity oscillations across the Ca II K line 
    Punetha, L. M. (1974)
    Intensities at various wavelengths in the Ca II K line over a 10 minute duration time series spectra have been examined for oscillations. Three components have been observed: 1) large period, ≥1000 second, due to the ...
  • Fine structure in CaII K line 
    Punetha, L. M. (1974)
    CaII K line spectrograms were traced at various wavelengths along the slit and also along the dispersion at regular intervals. Statistical properties, root mean square variation, full width at half maxima, autocorrelation ...
  • Nitric oxide in sunspots 
    Gaur, V. P. (1974)
    The calculated equivalent width of R₁ (26.5) line of the 0-1 vibration-rotation band of NO near 5.3 μm for the sunspot model of Stellmacher and Wiehr (1970) suggests the likelihood of the presence of this band in sunspot ...
  • Vibration-rotation bands of HF, HBr and HI in the sunspot spectrum 
    Pande, M. C.; Gaur, V. P. (1974)
    The calculated equivalent widths of R(7), R(9) and R(13) lines of 1-2 vibration-rotation band of HF for Henoux’s (1969) sunspot model suggest the presence of this band in sunspot spectrum. The reasons for the absence of ...
  • Ballik-ramsey band in solar spectrum 
    Pande, M. C.; Sinha, K. (1974)
    Equivalent width calculations for a line 1.83 μ of the 0-0 vibrational band of the Ballik-Ramesy band system has been carried out in two photospheric models- BCA and HSRA. Centre to limb variation of the above line is given ...
  • On the equivalent width of CH line in eta aquilae 
    Joshi, G. C. (1973)
    Equivalent widths of a line belonging to the 0-0 bands of the electronic transition ²∆-²∏ of the CH molecule have been calculated for various phases of light variation in η Aql. For the spectral calss of η Aql the equivalent ...
  • Formation of C₂ molecules in solar atmosphere 
    Sihna, K.; Pande, M. C. (1974)
    It is shown that while the triplet states of Swan bands are populated through an LTE path, the singlet states of Phillilps bands are not. The problems regarding the observations of t he various bands of C₂ molecules in the ...
  • A luminosity index for bright K0-K5 stars 
    Chaturvedi, J. P. (1974)
    An index for luminosity classification of K0-K5 stars based upon broad band UBRI observations has been obtained and discussed. This index has been employed to obtain the MK-luminosity classifications for 21 bright stars ...
  • Diffusion of CO and CH molecules in the solar atmosphere 
    Sinha, K.; Pande, M. C. (1973)
    The calculated rates of photodissoication, radiative association and the diffusion of CH and CO molecules show that the diffusion rates are many orders of magnitude smaller than the photodissociation and radiative association ...
  • On diatomic molecules in facula models 
    Tripathi, B. M.; Pande, M. C. (1973)
    Results of the dissociation equilibrium calculations in thre facula models indicate that more molecules form in the 7B2J Chapman model. Equivalent width calculations in 7B2J model show that the CO⁺ lines of (0-3) band of ...
  • Ionised molecules in BCA photospheric model 
    Pande, M. C.; Gaur, V. P. (1972)
    The dissociation equilibrium of ionized diatomic molecular species CO⁺, N O⁺, OH⁺, O₂⁺, N₂⁺, H₂⁺ in BCA photospheric model is considered. The abundances of these species are in the order H₂⁺, CO⁺, OH⁺, NO⁺, O₂⁺ and N₂⁺. ...
  • On the observability of CO and CO⁺ in eta aquilae 
    Pande, M. C.; Joshi, G. C. (1972)
    The equivalent widths of R(29) line belonging to 0-2 in η Aql are found to be 0.200 m Å and 4.17 m Å and of R(31) m Å at maximum and minimum phases respectively. Thus if Dawe’s model atmospheres are realistic there is some ...
  • C₂ in eta aquilae spectrum 
    Bondal, K. R.; Joshi, G. C.; Pande, M. C. (1973)
    The equivalent width of R₁ (16) line of the 0-0 band of the Swan system of C₂ calculated for the minimum phase of light variation in η Aql comes out to be 27 mÅ. Thus, if Dawe’s model atmosphere and the assumed abundance ...
  • Molecular abundances in sunspots 
    Gaur, V. P.; Pande, M. C.; Tripathi, B. M. (1973)
    The results of the dissociation equilibrium calculations for Zwaan’s sunspot model are given. It appears that many di-and tri-atomic molecules form in sufficient abundances in the spots. It is suggested that for assessing ...
  • Absence of the Phillips bands in the solar photospheric spectrum 
    Sinha, K. (1973)
    The absence of Phillips bands in the solar photospheric spectrum and the presence of Swan bands seems to point to a non-LTE path for the formation and disappearance of C₂ molecules in the solar photosphere.
  • A broad-band index for the effective temperatures of normal late type stars 
    Chaturvedi, J. P. (1972)
    An index for temperatures of stars, based on B, V and R magnitudes, has been obtained. It was found that {θ ₑ [(B-V) ² +(V+R) ²]¹/²} relations are well defined linear equations for stars of spectral type later than GO and ...
  • The dissociation equilibrium of some diatomic molecules in Delta Cephei 
    Pande, M. C.; Tripathi, B. M.; Murthy, C. S.; Gaur, V. P. (1971)
    The dissociation equilibrium of CO, CN, C₂, CH, NH and OH is considered for the maximum and minimum phases of the light curve of δ Cep. Concentration-optical depth curves show that with both the phases the abundances ...
  • A note on the effect of scattered light on the facula-to-photosphere contrast 
    Pande, M. C.; Tripathi, B. M.; Gaur, V. P. (1971)
    The measured facula-to-photosphere contrast in the continuum radiation corrected for the scattered light should yield a hotter average facula model than the models derived without such a correction.
  • Dependence of molecular dissociation equilibrium on magnetic field strength in sunspots 
    Gaur, V. P.; Pande, M. C.; Tripathi, B. M.; Joshi, G. C. (1971)
    It is shown that the total number of CO, CN, C₂, UH, NH and CH molecules varies significantly with magnetic field strength in sunspots. The equivalent widths of two first overtone lines of CO belonging to 0-2 vibration-rotation ...

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