Research Papers: Recent submissions

  • Champagne flow and triggered star formation in NGC 1893 
    Maheswar, G.; Sharma, S.; Biman, J. M.; Pandey, A. K.; Bhatt, H. C. (2007)
    Using Hα grism spectroscopy and optical and Two-Micron All-Sky Survey photometry of the fields containing NGC 1893 and two emission nebulae, Sim 129 and Sim 130, we show the presence of a number of Hα and near-infrared ...
  • Observation of the optical afterglow of GRB 050319: The wind-to-ISM transition in view 
    Kamble, A.; Resmi, L.; Misra, K. (2007-07-20)
    The collapse of a massive star is believed to be the most probable progenitor of a long gamma-ray burst (GRB). Such a star is expected to have its environment modified by the stellar wind. The effect of such a ...
  • Multi-wavelength signatures of magnetic reconnection of a flare-associated coronal mass ejection 
    Joshi, B.; Manoharan, P. K.; Veronig, A. M.; Pant, P.; Pandey, K. (2007)
    The evolution of an X2.7 solar flare, that occurred in a complex βγ δ magnetic configuration region on 3 November 2003 is discussed by utilizing a multi-wavelength data set. The very first signature of pre-flare coronal ...
  • Further evidence for intra-night optical variability of radio-quiet quasars 
    Goyal, A.; Krishna, G.; Sagar, R.; Anupama, G. C.; Sahu, D. K. (2007)
    Although well established for BL Lac objects and radio-loud quasars, the occurrence of intra-night optical variability (INOV) in radio-quiet quasars is still debated, primarily since only a handful of INOV events with ...
  • Interstellar dust studies with TAUVEX 
    Maheswar, G.; Muthu, C.; Sujatha, N. V.; Pandey, G.; Bhatt, H. C.; Rao, N. K.; Murthy, J. (2007)
    We propose to carry out studies on the properties of inter- stellar dust using TAUVEX. Through the multi-band TAUVEX observations, particularly with the use of filters optimized for extinction observations of the 2175 ...
  • Helical eruptive prominence associated with a pair of overlapping CMEs on 21 April 2001 
    Ali, S. S.; Uddin, W.; Chandra, R.; Mary, D. L.; Vršnak, B. (2007)
    The eruption of limb prominence on 21 April 2001 associated with two coronal mass ejections (CMEs) is investigated. Hα images reveal two large-scale eruptions (a promi- nence body and a southern foot-point arch), both ...
  • Discovery of 6-minute oscillations in HD 151878 
    Tiwari, S. K.; Chaubey, U. S.; Pandey, C. P. (2007-08-17)
  • Stellar contents of two intermediate age clusters: NGC 1912 and NGC 1907 
    Pandey, A. K.; Sharma, S.; Upadhyay, K.; Ogura, K.; Sandhu, T. S.; Mito, H.; Sagar, R. (2007-06-25)
    We present CCD photometry in a wide field around two open clusters, NGC 1912 and NGC 1907. The stellar surface density profiles indicate that the radii of the clusters NGC 1912 and NGC 1907 are ~14́ and ~6́respectively. ...
  • Star formation in young star cluster NGC 1893 
    Sharma, S.; Pandey, A. K.; Ojha, D. K.; Chen, W. P.; Ghosh, S. K.; Bhatt, B. C.; Maheswar, G.; Sagar, R. (2007)
    We present a comprehensive multiwavelength study of the star-forming region NGC 1893 to explore the effects of massive stars on low-mass star formation. Using near-infrared colours, slitless spectroscopy and narrow-band ...
  • Type IIP supernova SN 2004et: A multiwavelength study in X-ray, optical and radio 
    Misra, K.; Pooley, D.; Chandra, P.; Bhattacharya, D.; Ray, A. K.; Sagar, R.; Lewin, W. H. G. (2007)
    We present X-ray, broad-band optical and low-frequency radio observations of the bright type IIP supernova SN 2004et. The Chandra X-ray Observatory observed the supernova at three epochs, and the optical coverage spans ...
  • A study of the long-term evolution of quasi-periodic oscillations in the accretion-powered X-ray pulsar 4U 1626-67 
    Kaur, R.; Paul, B.; Kumar, B.; Sagar, R. (2008-04-01)
    We report here a study of the long-term properties of quasiperiodic oscillations (QPOs) in an unusual accreting X-ray pulsar, 4U 1626À67. This is a unique accretion-powered X-ray pulsar in which we have found the QPOs to ...
  • Mass functions and photometric binaries in nins open clusters 
    Sharma, S.; Pandey, A. K.; Ogura, K.; Aoki, T.; Pandey, K.; Sandhu, T. S.; Sagar, R. (2008-05)
    Using homogeneous CCD photometric data from the 105 cm Kiso Schmidt telescope covering a 50' × 50' field, we study the mass functions (MFs) of nine open clusters. The ages and Galactocentric distances of the target ...
  • Stellar contents and star formation in the young open cluster Stock 8 
    Jose, J.; Pandey, A. K.; Ojha, D. K.; Ogura, K.; Chen, W. P.; Bhatt, B. C.; Ghosh, S. K.; Minto, H.; Maheswar, G.; Sharma, S. (2008)
    We present UBVIc CCD photometry of the young open cluster Stock 8 with the aim of studying its basic properties such as the amount of interstellar extinction, distance, age, stellar contents and initial mass function ...
  • Stellar contents and star formation in the young star cluster Be 59 
    Pandey, A. K.; Sharma, S.; Ogura, K.; Ojha, D. K.; Chen, W. P.; Bhatt, B. C.; Ghosh, S. K. (2008)
    We present UBV Ic CCD photometry of the young open cluster Be 59 with the aim to study the star formation scenario in the cluster. The radial extent of the cluster is found to be ∼10 arcmin (2.9 pc). The interstellar ...
  • Observations of total solar eclipse of 29 March 2006 and related atmospheric measurements 
    Uddin, W.; Joshi, B.; Kumar, T. S.; Sharma, S.; Sagar, R. (2007-10-10)
    We report preliminary results on short-period oscillations in the corona and changes in the earth's atmospheric parameters, observed during a total solar eclipse of 29 March 2006 from Manavgat, Turkey
  • A giant radio JET ejected by an ultramassive black hole in a single-lobed radio galaxy 
    Bagchi, J.; Gopal-Krishna; Krause, M.; Joshi, S. (2007-12-01)
    We report the discovery of a very unusual, highly asymmetric radio galaxy whose radio jet, the largest yet detected, emits strongly polarized synchrotron radiation and can be traced all the way from the galactic ...
  • Pure science in real word 
    Sagar, R. (2007)
  • A multiwavelength study of galactic H II region Sh 2-294 
    Samal, M. R.; Pandey, A. K.; Ojha, D. K.; Ghosh, S. K.; Kulkarni, V. K.; Bhatt, B. C. (2007-12-10)
    We present the observational results of Galactic H II region Sh 2-294, using optical photometry, narrowband imaging, and radio continuum mapping at 1280 MHz, together with archival data from the 2MASS, MSX, and IRAS surveys. ...
  • A modern 3.6 meter new technology optical telescope as a major national initiative in Astrophysics 
    Sagar, R. (2007)
    The scientific development in the field of observational astronomy in India has been quite significant in the recent past. India has three 2-meter class optical and near infrared telescopes. These telescopes are mainly ...
  • The dark nature of GRB 051022 and its host galaxy 
    Castro-Tirado, A. J., ...et al. (including Mishra, K. & Sagar, R.) (2007)
    We present multiwavelength (X-ray/optical/near-infrared/millimetre) observations of GRB 051022 between 2.5 h and ∼1.15 yr after the event. It is the most intense gamma-ray burst (∼10-⁴ erg cm-² ) detected by HETE-2, with ...

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