Research Papers: Recent submissions

  • photometric observations of BW Vulpeculae 
    Singh, M.; Joshi, S. C. (1983)
    Photometry observations of β Cephei star BW Vul, secured on five nights, in B and V filters are given. A new ephemeris for the maxima of the star and its rate of change of period has been derived.
  • Spectroscopic studies of a few molecular bands in comets 
    Singh, M. (2008)
    Spectroscopic studies of comets were started at ARIES way back (some 35 years ago) and in this programme spectrophotometric observations of several comets were taken. The prominent emission features of CN (∆v = O) at 3883 ...
  • X-ray emission from O-type stars: DH Cep and HD 97434 
    Bhatt, H.; Pandey, J. C.; Kumar, B.; Sagar, R.; Singh, K. P. (2010)
    We present X-ray emission characteristics of the massive O-type stars DH Cep and HD 97434 using archival XMM-Newton observations. There is no convincing evidence for short-term variability in the X-ray intensity during ...
  • Observations from Hinode/EIS of intensity oscillations above a bright point: signature of the leakage of acoustic oscillations in the inner corona 
    Srivastava, A. K.; Dwivedi, B. N. (2010)
    We study the intensity oscillations in the upper chromosphere/transition region (TR) and corona, above a bright point (BP) in the solar atmosphere. We analyse the time series of He II 256 Å, Fe XII 195 Å and Fe XV 284 Å, ...
  • Photometry of the open clusters NGC 6913 
    Joshi, U. C.; Sanwal, B. B.; Sagar, R. (1983)
    Photoelectric UBV magnitudes and colours have been determined for 103 stars in the field of NGC 6913. The reddening across the cluster is variable. The distance modulus to the cluster is estimated at 10 ͫ.85±0 ͫ.15. It is ...
  • Variability of the hotter component of the eclipsing binary MM Cassiopeiae 
    Chaubey, U. S. (1983)
    The eclipsing binary MM Cas (alpha_1980 = 0h53.4m and delta_1980 = +54d20.5') was observed photoelectrically during 13 nights from December 1980 to September 1982 with the 104 cm telescope of the Uttar Pradesh State ...
  • Radio spectra of giant radio galaxies from RATAN-600 data 
    Khabibullina, M. L.; Verkhodanov, O. V.; Singh, M.; Priya, A.; Verkhodanova, N. V.; Nandi, S. (2010)
    Measurements of the flux densities of the extended components of seven giant radio galaxies obtained using the RATAN-600 radio telescope at wavelengths of 6.25 and 13 cm are presented. The spectra of components of these ...
  • Scanner observations of the classical Cepheids RT Aur and T Vul 
    Rautela, B. S,; Joshi, S. C. (1983)
    The effective temperatures of the classical Cepheids RT Aur and T Vul have been determined by a comparison of their spectral scans with appropriate model atmospheres. The radii of the stars have been determined through the ...
  • Photometry of the open clusters NGC 654 
    Joshi, U. C.; Sagar, R. (1983)
    Photoelectric UBV magnitudes have been determined for stars in the field of NGC 654. The reddening across the cluster varies from 0.74 to 1.16 mag. The true distance modules is estimated to be 10.85 mag. The HR- diagram ...
  • Twisted surge of 1981 December 25 
    Verma, V. K. (1983)
    Photographic observations and the morphological behaviour of the surge prominence of importance class 1 recorded with the 0.7 Å passbands H-alphs filter on 1981 December 25 have been described. The surge was recorded both ...
  • Integrated photometric parameters of open and globular clusters 
    Sagar, R.; Joshi, U. C.; Sinvhal, S. D. (1983)
    In this work we have discussed UBV parameters of 142 galactic clusters and 32 globular clusters. Comparison of the integrated parameters of galactic clusters with the theoretical ones confirms the validity of the basic ...
  • Behaviour of some neutral molecular absorption lines in facula models 
    Tripathi, B. M.; Sinha, K.; Pande, M. C. (1982)
    The equivalent widths of some selected absorption lines of C₂, CH, MgH, NH, OH and SH molecules in five facula and two photospheric models have been calculated under the assumption of LTE. The calculations reveal that the ...
  • Vibration - rotation bands of SiH and MgH in sunspot spectra 
    Sinha, K.; Joshi, G. C. (1982)
    We have calculated the equivalent widths of the vibration-rotation bands of SiH and MgH molecules for a possible detection in the sunspot spectrum. Five different models were utilized and the results obtained with and ...
  • Double ribbon flare of 1981 october 19 
    Verma, V. K.; Pande, M. C. (1983)
    Photographic observations with a 0.7 Å passband H-alpha Hale filter and morphological description of the double ribbon flare which occurred near Halle plage region 17926 on 1981 October 19 are described. Initially the ...
  • Study of the open cluster IC 1805 
    Joshi, U. C.; Sagar, R. (1983)
    Photometric magnitudes and colours in the UBV system have been determined for 169 stars in IC 1805. The reddening is variable across the cluster. The distance modules to the cluster is estimated at 11ᵐ.7. Star-formation ...
  • A note on the spectrum of Comet Austin (1982g) 
    Sanwal, B. B.; Rautela, B. S.; Goraya, P. S. (1982)
    Using the 1040 mm reflector, three spectrophotometric scans of the comet Austin (1982g) were obtained in the wavelength range λλ 3000-8000 Å on 1982 September 5, 8 and 9 at 15h, 14h and 14h UT respectively.
  • On MgH line intensities in sunspot umbrae 
    Sinha, K. (1982)
    The line intensities of the umbral MgH molecules reported by Sotirovski (1971) are re-analysed utilizing the latest laboratory data. It appears probable that because of a neglect of the role of blurring in producing stray ...
  • On the period of HD 200925 
    Gupta, S. K.; Padalia, T. D. (1982)
    Bedolla and Pena (1979) presented photoelectric observations of HD 200925 in V filter and estimated the period of its variability to be 0.238d with an amplitude of 0.35m. Later in 1979 this star was observed spectroscopically ...
  • Detection of intre-day variability timescales of four high-energy peaked blazars with XMM- newton 
    Gaur, H.; Gupta, A. C.; Lachowicz, P.; Wiita, P. J. (2010)
    We selected a sample of 24 XMM–Newton light curves (LCs) of four high energy peaked blazars, PKS 0548−322, ON 231, 1ES 1426+428, and PKS 2155−304. These data comprise continuous LCs of 7.67–18.97 hr in length. We searched ...
  • The IMF of stellar clusters: effects of accretion and feedback 
    Dib, S.; Shadmehri, M.; Padoan, P.; Maheswar, G.; Ojha, D. K.; Khajenabi, F. (2010)
    We have developed a model which describes the co-evolution of the mass function of dense gravitationally bound cores and of the stellar mass function in a protocluster clump. In the model, dense cores are injected, at a ...

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