Aryabhatta Research Institute of Observational Sciences: Recent submissions

  • 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 ...
  • 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 ...
  • 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 ...
  • 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⁺. ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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.
  • 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 ...
  • 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 ...
  • 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.
  • 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 ...
  • Rautel, B. S.; Joshi, S. C. (1976)
    The absolute energy distributions of the Cepheid ζ Gem at several phases of the light cycle have been given. By matching these with suitable model atmospheres, the effective temperatures of the star at these phases have ...
  • Sagar, R. (1976)
    The results of photoelectric U, B. V photometry of the galactic cluster NGC 2169 are presented. The colour excess excess E(B-V) is 0 ͫ .18. The distance modulus to the cluster and its age are respectively estimated at 9 ͫ ...
  • Srivastava, J. B. (1976)
    Photoelectric and absolute elements of the system CD Tau have been determined in U, B and V filters. The system is a detached one.
  • Kandpal, C. D. (1976)
    A slightly improved period of 1. ͩ 884 761 9, has been given for the system AO Mon. Photoelectric elements have been computed in B and V filters. The orbit is found to be eccentric. Absolute elements have been derived by ...
  • Sagar, R.; Mahra, H. S.; Joshi, S. C.; Srivastava, J. B. (1977)
    Photoelectric observations of Nova Sagittarii 1977 (alpha1950 =18h35m17s; delta1950= -23d 25'21") were secured on the 104-cm and 56-cm reflectors of the Uttar Pradesh State Observatory on several nights during April and ...
  • Joshi, U. C.; Sagar, R. (1977)
    The H-R diagram of the open cluster Tr-1 on Oja-membership and U, B, V photoelectric photometry is presented. The colour excess E(B-V)is 0 ͫ.52. the distance modulus to the cluster and its age are, respectively, estimated ...
  • Babu, G. S. D. (1977)
    Based on the observed energy curves of nine Ap stars, three Am stars, and four normal A stars and one F0 V magnetic star, their radii have been estimated. Thence, the bolometric magnitudes Mbol have been obtained and a ...
  • Joshi, S. C.; Rautela, B. S. (1978)
    The continuous energy distribution of ρ Cas obtained in the wavelength range 340-710 nm has beeb compared with the energy distribution of δ CMa in the same wavelength range. The circumstellar shell associated with ρ Cas ...

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