Aryabhatta Research Institute of Observational Sciences: Recent submissions

  • 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 ...
  • Spectrophotometric determination of the temperature of the Cepheid ζ geminorum 
    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 ...
  • Photometry of the galactic cluster NGC 2169 
    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 ͫ ...
  • Photoelectric elements of CD TAU 
    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.
  • Photoelectric elements of the binary system AO Monocerotis 
    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 ...
  • Photoelctric observations of NOVA Sagittarii 1977 
    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 ...
  • Photoelectric photometry of the open cluster Tr-1 
    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 ...
  • Radii of some Ap, Am and A stars 
    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 ...
  • Absolute energy distribution in Rho Cassiopeiae 
    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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