Aryabhatta Research Institute of Observational Sciences: Recent submissions

  • A kinematic and photometric study of the galactic young star cluster NGC 7380 
    Unknown author (IOP, 2011-09)
    We present proper motions, radial velocities, and a photometric study of the Galactic open cluster NGC 7380, which is associated with prominent emission nebulosity and dark molecular clouds. On the basis of the sample of ...
  • Star formation activity in the galactic H II complex S255-S257 
    Ojha, D. K. (IOP, 2011)
    We present results on the star formation activity of an optically obscured region containing an embedded cluster (S255-IR) and molecular gas between two evolved H II regions, S255 and S257. We have studied the complex using ...
  • Altitude variation of aerosol properties over the Himalayan range inferred from spatial measurements 
    Dumka, U. C.; Moorthy, K. K.; Tripathi, S. N.; Hegde, P.; Sagar, Ram (Science Direct, 2011)
    Altitude variations of the mass concentration of black carbon, number concentration of composite aerosols are examined along with the columnar spectral aerosol optical depths using state of the art instruments and the ...
  • Search for P-mode pulsctions in late-type CP Stars 
    Joshi, S.; Chakradhari, S. Joshi (Adv. Geo., 2011)
    The Sun, solar-like oscillators, δ-Scuti and roAp stars are few examples of the main-sequence pulsating stars for which the quantitative measurements of the internal structure parameters have been derived from their ...
  • Observation of Kink Instability as Driver of Recurrent Flares in AR 10960 
    Srivastava, A. K.; Kumar, Pankaj; Zaqarashvili, T. V.; Filippov, B. P.; Uddin, W. (Adv. Geo., 2011)
    We study the active region NOAA 10960, which produces two flare events (B5.0, M8.9) on 04 June 2007. We find the observational signature of right handed helical twists in the loop system associated with this active region. ...
  • Evidence of the leakage of MHD oscillations above on-disk coronal hole 
    Kumar, M.; Dwived, B. N.; Srivastava, A. K. (Adv. Geo., 2011)
    We analyze the temporal image data of the on-disk coronal hole as observed on 31 March 2007 by the XRT/Hinode telescope and Al-poly filter. We choose this temporal image data of 30 s cadence from 11:34:48 UT to 14:19:35 ...
  • Observations of X-ray flares and associated MHD oscillations in star ξ Boo 
    Pandey, J. C.; Srivastava, A. K. (Adv. Geo., 2011)
    Using data from observations made with XMM-Newton, we present an X-ray analysis of two flares observed in ξ Boo. The flare loop parameters are derived using various loop models including state-of-the-art hydrodynamic flare ...
  • Size distribution of atmospheric aerosols at Maitri, Antarctica 
    Pant, V.; Singh, D.; Kamra, A. K. (2011)
    Measurements of the concentration and size distribution of the atmospheric aerosol particles in the size range of 0.003–20 μm diameter have been made at Maitri (70°45′52″S, 11°44′03″E) during January–February, 2005. The ...
  • Numerical simulations of magnetoacoustic-gravity waves in the solar atmosphere 
    Murawski, K.; Srivastava, A. K.; McLaughlin, J. A.; Oliver, R. (2013)
    We investigate the excitation of magnetoacoustic–gravity waves generated from localized pulses in the gas pressure as well as in the vertical component of velocity. These pulses are initially launched at the top of the ...
  • Rapid optical variability of TeV blazars 
    Gopal-Krishna; Goyal, A.; Joshi, S.; Karthick, C.; Sagar, R.; Wiita, P. J.; Anupama, G. C.; Sahu, D. K. (2011)
    In this first systematic attempt to characterize the intranight optical variability (INOV) of TeVdetected blazars, we have monitored a well-defined set of nine TeV blazars on total 26 nights during 2004–10. In this R- or ...
  • Quasi-spherical, Time-dependent viscous accretion flow: one-dimensional results 
    Lee, S.; Ryu, D.; Chattopadhyay, I. (2011)
    We investigated the instability of advective accretion flow as a consequence of angular momentum transfer in one-dimensional, quasi-spherical transonic accretion flow around a non-rotating black hole. The code is designed to ...
  • Variability of spectral snergy distribution of Blazar S5 0716+714 
    Rani, B.; Gupta, A. C.; Wiita, P. J. (2011)
    The emission from blazars is known to be variable at all wavelengths.The flux variability is often accompanied by spectral changes. Spectral energy distribution (SED) changes must be associated with changes in the spectra ...
  • UV and X-ray variability of blazars 
    Gupta, A. C. (2011)
    It is well established that the blazars show flux variations in the complete electromagnetic (EM) spectrum on all possible time scales ranging from a few tens of minutes to several years. Here we report the review of ...
  • Re-Analysis of QPO in 3C 273 light curve 
    Mohan, P.; Mangalam, A.; Chand, H.; Gupta, A. C. (2011)
    We have developed analysis tools to search for quasi periodic oscillations in light curves from active galactic nuclei, using the following time series techniques: Wavelets, periodogram, Lomb–Scargle periodogram, structure ...
  • Star formation in bright-rimmed clouds and clusters associated with the W5 E H II region 
    Chauhan, N.; Pandey, A. K.; Ogura, K.; Jose, J.; Ojha, D. K.; Samal, M. R.; Mito, H. (2011)
    The aim of this paper is to present the results of photometric investigations of the central cluster of the W5 E HII region as well as a follow-up study of the triggered star formation in and around bright-rimmed clouds ...
  • Optical microvariability properties of BALQSOs 
    Joshi, R.; Chand, H.; Gupta, A. C.; Wiita, P. J. (2011)
    We present optical light curves of 19 radio-quiet (RQ) broad absorption line (BAL) quasi-stellar objects (QSOs) and study their rapid variability characteristics. Systematic CCD observations, aided by a careful data ...
  • Observation of intensity oscillations above X-ray bright points from the Hinode/XRT: signature of magnetohydrodynamic oscillations in the solar corona 
    Kumar, M.; Srivastava, A. K.; Dwivedi, B. N. (2011)
    We analyse the temporal image data of the quiet Sun observed by the X-ray Telescope (XRT) onboard the Hinode spacecraft and Al-poly filter on 2007 March 31.We choose these temporal image data of ∼30 s cadence from 11:34:48 ...
  • Pulsation and rotation of Kepler stars in the NGC 6866 field 
    Balona, L. A.; Joshi, S.; Joshi, Y. C.; Sagar, R. (2013)
    We present an analysis of stars in the field of the open cluster NGC 6866 (age 650 Myr) using data from the Kepler Input Catalogue (KIC) and time series photometry from the Kepler data base. We identify 31 δ Scuti and 8 γ ...
  • ARIES Academic Report 2011-2012 
    Unknown author (ARIES, Nainital, 2012-09)
  • ARIES Brochure 2012 
    ARIES (2012-02-12)

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