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Browsing Aryabhatta Research Institute of Observational Sciences by Title

Browsing Aryabhatta Research Institute of Observational Sciences by Title

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  • The 3,6 m Indo-Belgian Devasthal Optical Telescope : General description 
    Ninane, N.; Flebus, C.; Kumar, B. (2012)
    In 2007, AMOS SA signed a contract for the design and building of a 4M class telescope with ARIES (Aryabhatta Research Institute of Observational Sciences) India. Today the telescope is constructed and ready to be shipped ...
  • A ∼4.6 h quasi-periodic oscillation in the BL Lacertae PKS 2155-304? 
    Lachowicz, P.; Gupta, A. C.; Gaur, H.; Wiita, P. J. (2009)
    We report a possible detection of an ̴4.6-h quasi-periodic oscillation (QPO) in the 0.3–10 keV emission of the high-energy peaked blazar PKS 2155−304 from a 64 ks observation by the XMM-Newton EPIC/pn detector. We identify ...
  • The 404 MHz wind profiler to observe precipitation 
    Singh, Narendra; Joshi, R. R.; Damle, S. H.; Pant, G. B. (2012)
    This article delineates the tropical precipitation and classification of precipitating systems into stratiform and convective type, using the UHF wind profiler located at the Indian tropical station Pune (18°32′N, 73°51′E). ...
  • The 72-h WEBT microvariability observation of blazar S5 0716+714 in 2009 
    Bhatt, G., et al.; Gupta, A. C.; Sagar, R. (ESO, 2013)
    Context. The international Whole Earth Blazar Telescope (WEBT) consortium planned and carried out three days of intensive micro-variability observations of S5 0716+714 from February 22, 2009 to February 25, 2009. This ...
  • (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 ...
  • 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.
  • 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 ...
  • Absolute energy distribution og two δ scuti variable 
    Joshi, S. C.; Rautela, B. S. (1973)
    The absolute energy distribution of two δ sct stars β cas (HR 21)and υ UMa (HR 3888) have been given.by matching these with model atmospheres there effective temperatures,gravities,radii and masses have been estimated.
  • Absolute energy distribution studies in stars and comets 
    Sanwal, B. B.; Rautela, B. S. (1998)
    Through the visible window of the earth's atmosphere, we measured portions of stellar continuum of six classical cepheids and a few Be stars, using a Hilger and Watts spectrum scanner at the Cassegrain focus of the one ...
  • Absolute spectrophotometry of comet Kohoutek 1973f during post-perihelion passage 
    Goraya, P. S.; Rautela, B. S.; Sanwal, B. B. (1986)
    Absolute spectrophotometry of the coma of Comet Kohoutek 1973f during post-perihelion period has been presented for seven nights in January 1984. Moderately wide range of heliocentric distance (0.436-0.799 AU) covered ...
  • Abundances of four open clusters from solar stars 
    Pace, G.; Pasquini, L.; Francois, P. (2008)
    Aims. We present the abundance measurements of several elements (Fe, Ca, Na, Ni, Ti, Al, Cr, Si) for 20 solar-type stars belonging to four Galactic open clusters: NGC 3680, IC 4651, Praesepe, and M 67. Oxygen abundances ...
  • The acceleration of electrons and ions in solar flares 
    Verma, V. K. (1991)
    We find that gamma-ray line (GRL) emissions start later than the hard X-ray (HXR) emissions during impulsive and extended solar flares. Starting delay is more in the case of extended solar flares suggesting a slow acceleration ...
  • Accretion disc sizes from continuum reverberation mapping of AGN selected from the ZTF survey 
    Jha, Vivek Kumar; Joshi, Ravi,et.al. (Monthly Notices of the Royal Astronomical Society, 2022-04)
    We present the accretion disc-size estimates for a sample of 19 active galactic nuclei (AGNs) using the optical g-, r-, and i-band light curves obtained from the Zwicky Transient Facility survey. All the AGNs have reliable ...
  • Accretion disc spectrum in presence of mass outflow around black holes 
    Mandal, S.; Kumar, R.; Chattopadhyay, I. (ASI, 2013)
    We study the effect of mass outflow on the accretion disc spec- trum in presence of heating and cooling processes. Radiation spectrum shows a softening of spectral index in presence of mass outflow. This can explain the ...
  • Accretion Flows in Magnetic Cataclysmic Variables 
    Rawat, Nikita (ARIES, Nainital, 2023-09)
    Magnetic Cataclysmic Variables (MCVs) are a unique category of semi-detached binary star systems consisting of a high magnetic field (B >1 MG) white dwarf (WD) and a companion star, usually a late-type main sequence star ...
  • Accretion of multi-species plasma onto black holes 
    Chattopadhyay, I. (2012)
    Matter falling onto a black hole is trans-relativistic, transonic, and close to the horizon it is sub-Keplerian. Such a flow shows the existence of multiple critical point, shocks etc. Employing relativistic equation of ...
  • Activity of Young Dwarfs with Planetary Systems: EPIC 211901114 and K2–33. 
    Savanov, S.; Dmitrienko, E. S.; Karmakar, S.; Pandey, J. C. (Astronomy reports, 2018-08)
    The results of an analysis of the activity of the young stars with planetary systems EPIC 211901114 and K2–33 based on observational data obtained over 70 days with the Kepler Space Telescope are presented. The rotation ...
  • Actors of the main activity in large complex centres during the 23 solar cycle maximum 
    Schmieder, B., ... et al. (including Uddin, W. & Kumar, P.) (2011-02-25)
    During the maximum of Solar Cycle 23, large active regions had a long life, spanning several solar rotations, and produced large numbers of X-class flares and CMEs, some of them associated to magnetic clouds (MCs). This ...
  • Additional polarised standards in the fields of known bright standard stars 
    Soam, A.; Maheswar, G.; Eswaraiah, C. (Springer, 2013-12-19)
    We present the results based on broad-band (VRI) polarimetric observations of a number of stars that are present towards the fields of already known bright po- larised standard stars namely BD+59° 389, HD 19820, and ...
  • Aerosol and pollutant characteristics in Delhi during a winter research campaign 
    Dumka, Umesh C. et al. (Environmental Science and Pollution Research, 2019-02)
    Urban areas in developing countries are major sources of carbonaceous aerosols and air pollutants, pointing out the need for a detailed assessment of their levels and origin close to the source. A multi-instrument research ...

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