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  • 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 ...
  • 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 ͫ ...
  • Mulliken bands in the solar spectrum 
    Sinha, K.; Joshi, G. C. (1976)
    The lower X¹Σg state of the Phillips and of the Mulliken band system of C₂ molecule lies very close to the X¹ ³πᵤ' the lower electronic state of the Swan system observed in the photospheric spectrum.
  • 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 ...
  • Study of the Delta-Scuti star HR 1170 
    Gupta, S. K. (1977)
    The light and colour curves of the δ-Scuti star HR 1170 are presented. The absolute and bolometric magnitudes are derived and the position of the star on the colour-colour diagram is also shown. The primary and beat periods ...
  • 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 ...
  • 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 ...
  • On the rotational temperature of Tio in sunspots 
    Sinha, K. (1977)
  • Vibration rotation bands of SiO in sunspots 
    Gaur, V. P.; Pande, M. C.; Tripathi, B. M. (1978)
    The equivalent widths of P(51) and R(43) lines of the 1-0 and P(45) and R(56) lines of the 2-1 vibration rotation bands of SiO near 8 µm region, have computed for Zwaan's(1974) sunspots model at the centre of the disc. The ...
  • Spectrophotometry of comet West (1975n) after the perihelion passage 
    Chaubey, U. S. (1978)
    In the wavelength range 350to 650 nm, the flux distribution of comet West (1975n) is presented for various dates following perihelion passage. The variations with heliocentric distances, in the flux of the emission features ...
  • Period-mass ratio relations for eclipsing binaries with periods not exceeding 5 days 
    Sinvhal, S. D.; Srivastava, J. B. (1978)
    The dependence of mass ration of eclipsing binary system on period has been studied. It has been found that semi-detached systems obey the relation m₂/m₁ = 0.64 - 0.079P or m₂/m₁ = 0.29 - 0.028P depending upon whether the ...
  • CH and CH⁺ lines in facula models 
    Tripathi, B. M. (1978)
    Equivalent width calculations for CH and CH⁺ are carried out in three facula models. For CH, the λ4313.662 A line of the (0-0) and of the transition ²∆ - ²II of the Q₁c branch, and for CH⁺ , the λ 4288.047 A line of the ...
  • Effective temperatures, radii and bolometric magnitudes of Ap and Am stars 
    Babu, G. S. D.; Rautela, B. S. (1978)
    The effective temperatures, radii and bolometric magnitudes of Ap, Am and normal A stars have been estimated from their energy distribution curves between 478 nm and 680 nm. All the Am stars and one Ap star (i.e. β CrB) ...
  • Study of the galactic cluster NGC 581 
    Sagar, R.; Joshi, U. C. (1978)
    Photoelectric magnitudes and colours in the UBV system have been determined for 73 stars in NGC 581. The value of the interstellar reddening is 0 ͫ . 38. The distance modulus to the cluster is estimated at 12 ͫ .16±0 ͫ .1 ...
  • 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 ...
  • On the gamma system of nitric oxide in sunspots 
    Joshi, G. C.; Pande, M. C.; Shukla, D. S. (1978)
    With the aim of investigating the resonance system of NO,equivalent width calculation have been made for the 213.575nm,Q1(31.5)line of the 1-0 band of y-system of NO for the photospheric HSRA model,and for the line ...
  • The gap in the H-R diagram of open clusters with special reference to NGC 2169, NGC 1778 and Tr ׀ 
    Sagar, Ram; Joshi, U. C. (1978)
    The colour-magnitude diagrams of the open clusters NGG 1778 and Tr 1 indicate the presence of gaps of the rising branches of the evolving main sequence. the positions of these gaps are compared with those found in other ...
  • Isotopic lines of SiO in sunspots 
    Pande, M. C.; Joshi, G. C. (1978)
    As the isotopic shift for the vibration rotation band is generally much larger than the isotopic shift for the corresponding electronic transitions and thus facilitating separation of isotopic lines, the vibration rotation ...
  • Study of the extremely young open cluster NGC 6530 
    Sagar, R.; Joshi, U. C. (1978)
    Photoelectric magnitudes and colours in the UBV system have been determined for 101 stars in the field of NGC 6530. The interstellar reddening across the cluster varies from 0.25 to 0.48 mag, with an average value of 0.35 ...
  • Empirical P-L-C relations for Delta Scuti stars 
    Gupta, S. K. (1978)
    Separate P-L-C relations have been empirically derived by sampling the δ Scuti stars according to their pulsation modes. The results based on these relations have been compared with those estimated from the model based ...

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