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  • Periodogram analysis of the light curves of 44 Tau 
    Gupta, S. K. (1979)
    The periodogram analysis of the light curves of the curves of the scuti star 44 tau(=HR 1287) has been carried out. The fundamental period of 44 Tau ,based on the epochs of maxima, is found to be 0.d144969 and the beat ...
  • On the variability of the suspected beta cephei stars V351, V356, V357 Per 
    Mahra, H. S.; Mohan, V. (1979)
    Hill (1967) has listed a number of suspected Beta Cephei stars. Out of these the stars V351 Per (HD 13051), V356 Per (BD 56°473) and V357 Per (HD 13866) were put on our observing programme, in order to determine their variability.
  • (A-X) system of SiO in sunspots 
    Joshi, G. C.; Punetha, L. M.; Pande, M. C. (1979)
    The calculated equivalents widths of some lines of SiO in the umbral spectrum suggest that strong lines of Si²⁸ O¹⁶ , Si²⁹ O¹⁶ , and Si³⁰ O¹⁶, may be present in the sunspot ultraviolet spectrum. We also find that between ...
  • Emissions from the head of comet Bradfield (1978c) 
    Chaubey, U. S. (1979)
    The flux distribution in the head of comet Bradfield (1978c) during the pre-perihelion period has been obtained in the wavelength range 400-640 nm. The emission fluxes at 474 nm, 516 nm, 564 nm and 589 nm are reported. By ...
  • Mass transfer in TV Cassiopeiae 
    Chaubey, U. S. (1979)
    The period variations of TV Cassiopeiae between 1901 and 1977 are discussed in the light of the period change model proposed by Biermann and Hall. During each period decrease 4.0 x 10¯⁶M☉ of mass is transferred from the ...
  • Photoelectric elements of the eclipsing binary XY Cep 
    Srivastava, J. B.; Kandpal, C. D. (1979)
    The light curve and U, B and V observations of the system XY Cep have been presented. Photoelectric and absolute elements of the system have been determined. It is a semi-detached system.
  • On the period of delta ceti 
    Mohan, V. (1979)
    A period analysis of δ Ceti has been carried out. It has been found that the period of δ Ceti has undergone a sudden decrease somewhere after 1976. The average period between 1976 and 1978 has been found to be 0ᵈ.1611335
  • 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 ...
  • Classification of M-type stars from spectral scans 
    Rautela, B. S.; Joshi, S. C. (1979)
    Continuous spectral scans of 64 M-type stars in the wavelength region 400-750 nm have been obtained with a bandwidth of 5 nm. The scans have been placed on an absolute energy scale. In this paper we discuss three classification ...
  • 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 ...
  • Solar photospheric models and the rotational temperatures of the C₂ and MgH molecules 
    Singh, K.; Shukla, D. S.; Tripathi, B. M. (1979)
    Four photospheric models have been utilized to derive model based rotational temperatures of the (0-0) band of the Swan system of C₂ and that of the green system of the MgH molecules. The dissociation energies were varied ...
  • Photoelectric observations of the novalike objects in vulpecula 
    Mahra, H. S.; Joshi, S. C.; Srivastava, J. B.; Dhir, S. L. (1979)
    Photoelectric observations of the novalike objects in vulpecula were obtained on several nights during the period April to June 1979, on the 104-cm reflector of the Uttar Pradesh State Observatory, using UBV filters of ...
  • 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.
  • Extended ring system of Uranus 
    Bhattacharyya, J. C.; Bappu, M. K. V.; Mohin, S.; Mahra, H. S.; Gupta, S. K. (1979)
    Two photoelectric records of the occultation event on 10 March, 1977, obtained by two 102-cm-aperture telescopes, spaced 1500 km apart, are critically analysed and indications of a complex structure of distribution of ...
  • Molecular line haze opacity in sunspots 
    Gaur, V. P.; Pande, M. C.; Sah, M. (1979)
    It has been shaown that bound-bound opacity due to electronic transitions of molecules CN, CaH, MgH and TiO explains, in first approximation, the line haze opacity postulated by Zwaan (1974) for the region 0.5 µm to 0.9 ...
  • On the infrared opacity of sunspots 
    Joshi, G. C.; Punetha, L. M.; Pande, M. C. (1979)
    In the umbral atmosphere the depth dependence of the opacity due to the vibration rotation bands of various abundant molecules in the wavelength region 1µm to 10µm has been calculated. In the higher layers of the umbral ...
  • A study of the young open cluster NGC 6611 
    Sagar, R.; Joshi, U. C. (1979)
    Photoelectric magnitudes and colours in the UBV system have been determined for 50 stars in NGC 6611. The reddening value varies across the cluster from E(B-V) - 0ᵐ.58 to E(B-V) = 1ᵐ.21. The distance modulus to the cluster ...
  • Centre to limb behaviour of molecular rotational temperatures 
    Sinha, K. (1979)
    Withbroe'(1968) photospheric data on the equivalent widths of C2 lines for various positions on the solar disc have been utilized by us to determine the centre to limb behaviour of the rotational temperature.in view of ...
  • Light variation of the delta Scuti star 38 CNC 
    Gupta, S. K. (1979)
    The light curves of the δ Scuti variable 38 Cnc, which is member of the Praesepe cluster, have been analysed using the techniques of perodogram analysis and least square solutions. The star pulsates in the second overtone ...
  • Spectrophotometric observations of Mira Ceti 
    Joshi, S. C.; Rautela, B. S.; Sanwal, B. B. (1980)
    Following an announcement in the IAU Circular No. 3407 by S. McLean, we have observed the long period variable Mira (o Ceti) on two nights (6 and 18 October 1979) with the help of a scanner attached to the 104-cm reflector ...

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