Research Papers: Recent submissions

  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • The photoelectric elements of AS Camelopardalis 
    Padalia, T. D.; Srivastava, R. K. (1975)
    Improved geometrical elements of the system AS Cam have been obtained and the colour of the system has been discussed. The absolute dimensions have also been obtained on the basis of the spectroscopic elements given by ...
  • Photoelectric elements of the eclipsing binary XY Ceti 
    Srivastava, R. K.; Padalia, T. D. (1975)
    The absolute elements of the system XY Ceti have been obtained on the basis of the spectroscopic elements given by Popper (1971) and the photoelectric elements derived by us. The colours of the components have been obtained. ...
  • 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 ...
  • 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) ...
  • 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 ...
  • 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 ...
  • Photoelctric photometry of the eclipsing binary EE Aqr 
    Padalia, T. D. (1979)
    The system EE Aqr has been observed in UBV colours. A consistent set of orbital elements and a slightly improved period of 0.ᵈ5089954 have been obtained. The eclipse is partial and varability is of β Lyrae-type. The colour ...
  • On the presence of SH in the sunspot spectrum 
    Joshi, G. C.; Pande, M. C. (1979)
    The expected equivalent widths of individual rotational lines of the most intense Q₂ branch of the 0-0 band of the A²∑-X² пi, system of S³²H and S³⁴ H have been calculated in the umbral spectrum for five disk positions ...
  • On the O₂ Schumann-Runge band system in sunspots 
    Joshi, G. C.; Punetha, L. M.; Pande, M. C. (1979)
    The visibility in the umbral ultraviolet spectrum of the O₂ Schumann-Runge absorption band system has been explored. It is found that the band system may be visible in high dispersion sunspot spectrum.

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