Aryabhatta Research Institute of Observational Sciences: Recent submissions

  • Physical conditions in wolf-rayet atmospheres 
    Bappu, M. K. Vainu (1957-10-31)
    A critical discussion of present-day knowledge regarding the Wolf-Rayet atmosphere is presented. It is shown that the large widths usually ascribed to the emission lines are formed by heavy blending, and that the individual ...
  • Instrumentation: CCD and Telescope 
    Lohani, Anjali (ARIES, Nainital, 2015)
    The aim of this project was to gain a first hand knowledge of instruments such as CCD and telescope being used in current astronomy. In this project, I have learnt the basic ...
  • Automatic weather station data handling 
    Shikha (ARIES, Nainital, 2015)
    This project is abouthow to handle the data provided by AWS and further displaying it on to the web page. The objective is to store the data generated by the data logger of AWS into the database from where further ...
  • Solar flares induced D-region ionospheric and geomagnetic perturbations 
    Selvakumaran, R. et. al. (2015)
    The D-region ionospheric perturbations caused by solar flares which occurred during January 2010–February 2011, a low solar activity period of current solar cycle 24, have been examined on NWC transmitter signal (19.8 kHz) ...
  • CIV absorption-line variability in X-ray-bright broad absorption-line quasi-stellar objects 
    Joshi, R.; Chand, H.; Srianand, R.; Majumdar, J. (2014)
    We report the kinematic shift and strength variability of the C IV broad absorption-line (BAL) trough in two high-ionization X-ray-bright quasi-stellar objects (QSOs): SDSS J085551+375752 (at zem ∼ 1.936) and SDSS ...
  • Multiband optical variability studies of BL Lacertae 
    Agarwal, Aditi; Gupta, A. C. (2015)
    We monitored BL Lacertae for 13 nights in optical B, V, R, and I bands during 2014 October and November including quasi-simultaneous observations in V and R bands using two optical telescopes in India. We have studied ...
  • Study of Milky Way galaxy using open star cluster 
    Bhatt, Sunita (ARIES, 2015)
    In this project, our main aim is to study the structure of Milky Way galaxy with the help of open clusters. We selected 1850 open star clusters from the catalogue of Dias et al. (2002). The fundamental parameters like ...
  • Image quality of 3.6m optical telescope 
    Anisha (ARIES, 2015)
    The 3.6m optical telescope is being installed at Devasthal, Nainital, and it will provide seeing limited observational capabilities at visible and near infrared bands. The image quality of any optical telescope is very ...
  • Millimetre observations of Gamma-ray bursts at IRAM 
    Castro-Tirado, A. J. et. al.; Pandey, S. B. (2013)
    Since 1997, and following our detection of the first mm after-glow, we have followed-up 70GRBs, mainly with the IRAM’s Plateau de Bure Interferometer, what can be considered as the IRAM Legacy GRB Sample. 66 events were ...
  • A multiband optical polarimetric study of classical be stars with exceptionally large near-infrared excess 
    Lee, C-D; Eswaraiah, C.; Pandey, A. K.; Chen, W-P (2013)
    Polarimetric technique is an ef_cient tool to study the dust properties not only in the interstellar and intra-cluster medium, but also in circumstellar environments.We present new multiband (BV(RI)C) optical polarimetric ...
  • Magnetic field structure inferred by near infrared polarization in the carina nebula and RCW57A 
    Su, B. H. et. al.; Eswaraiah, C.; Pandey, A. K. (2013)
    Carina Nebula (NGC3372) and RCW57A (NGC 3576) are among the brightest Galactic nebulae, with a wealth of massive stars and infrared excess stars, suggestive of recent and ongoing star formation. We present near-infrared ...
  • Sensitivity of 3.6m Devastal Optical Telescope 
    Devanandan, Anusree P. (ARIES, 2015)
    The 3.6m optical telescope, currently the largest optical telescope in India is being built at Devasthal with an aim to develop an observational facility with spectral and seeing limited imaging capabilities at visible ...
  • Magnetic fields in cometary globules – IV. LBN 437 
    Soam, A.; Maheswar, G.; Bhatt, H. C.; Lee, C. W.; Ramaprakash, A. N. (2013)
    We present results of our R-band polarimetry of a cometary globule, LBN 437 (Gal 96-15, ℓ = 96◦, b = −15°), to study the magnetic field geometry of the cloud. We estimated a distance of 360 ± 65 pc to LBN 437 (also one ...
  • A study of a failed coronal mass ejection core associated with an asymmetric filament eruption 
    Joshi, N. C.; Srivastava, A. K.; Filippov, B.; Uddin, W.; Kayshap, P.; Chandra, R. (2013)
    We present multi-wavelength observations of an asymmetric filament eruption and associated coronal mass ejection (CME) and coronal downflows on 2012 June 17 and 18 from 20:00–05:00 UT. We use SDO/AIA and STEREO-B/SECCHI ...
  • Correlation studies between hard and soft-x-ray bands in seyfert galaxies 
    Aggrawal, Vishi (ARIES, 2015)
    AGNs are the tiny, central, compact regions present in certain galaxies and produce tremendous luminosity. The emissions from AGN emerge over an exceptionally wide range of frequencies showing very distinctive spectra. ...
  • Short duration gamma-rays bursts and its implications 
    Rathour, R. S. (ARIES, 2015)
    The aim of this study is to understand the mechanism of prompt emission and afterglow properties of Short Gamma-ray bursts and their implications in astrophysical context.
  • Intranight optical variability of ƴ -ray-loud narrow-line Seyfert 1 galaxies 
    Paliya, V. S.; Stalin, C. S.; Kumar, Brijesh; Kumar, Brajesh; Bhatt, V. K.; Pandey, S. B.; Yadav, R. K. S. (Oxford University Press, 2013)
    The Large Area Telescope (LAT) on-board the Fermi Gamma-ray Space Telescope has detected ƴ -ray emission in about half a dozen narrow-line Seyfert 1 (NLSy1) galaxies. This indicates the presence of relativistic jets in ...
  • GRB 110709A, 111117A, AND 120107A: faint high-energy gamma-ray photon emission from fermi-lat observations and demographic implications 
    Zheng, W., et al.; Pandey, S. B. (The American Astronomical Society, 2012)
    Launched on 2008 June 11, the Large Area Telescope (LAT) instrument on board the Fermi Gamma-ray Space Telescope has provided a rare opportunity to study high-energy photon emission from gamma-ray bursts (GRBs). Although ...
  • Double-double radio galaxies from the First survey 
    Nandi, S.; Saikia, D. J. (Astronomical Society of India, 2012)
    The radio structures and optical identifications of a sample of 242 sources classified as double-double radio sources by Proctor (2011) from a morphological study of sources in the FIRST (Faint Images of the Radio Sky ...
  • Origin of macrospicule and jet in polar corona by a small-scale kinked flux tube 
    Kayshap, P.; Srivastava, A. K.; Murawski, K.; Tripathi, D. (2013)
    We report an observation of a small-scale flux tube that undergoes kinking and triggers the macrospicule and a jet on 2010 November 11 in the north polar corona. The small-scale flux tube emerged well before the triggering ...

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