Research Papers: Recent submissions

  • Spectrophotometric observations of comet Hale Bopp (C/1995 O1) 
    Rautela, B. S.; Joshi, G. C.; Srivastava, J. B. (2000)
    Haser Model production rates of CN and C₂ in the coma of the comet Hale-Bopp (C/1995 O1) have been obtained. Molecular production rate, size of the nucleus and continuum flux at 484.0 nm have further been analyzed to get ...
  • Dynamics of limb flar and associated primary and secondary post flare loops 
    Uddin, W.; Joshi, B.; Chandra, R.; Joshi, A. (2003)
    In this paper we present the analysis of M 1.8 class (GOES SXR) limb flare and associated post flare loops of 2 May, 2001 which erupted on the west limb in NOAA 9433 (N15, W88). The flare started at around 00:32 UT from a ...
  • Studies of young stellar objects 
    Yadav, R. K. S. (2003)
    We present a detailed study of four young open star clusters and two OB associations using deep CCD UBVRI and 2MASS JHK measurements. Physical parameters of the clusters have been estimated using optical as well as near ...
  • FR Cnc - A young spotted star 
    Pandey, J. C. (2003)
    Optical photometric and spectroscopic studies of the star FR Cnc = BD + 16 1753 have been carried out during the years 2001-2002. The rapid changes in the shape of light curve can be attributed to the formation and ...
  • Open star clusters: Star formation and structure 
    Pandey, A. K. (2003)
    Observational evidences indicate that the formation of open star clusters has been efficient throughout the life of our Galaxy. As a consequence, we find open clusters with ages ranging from a few Myr to few Gyr. This makes ...
  • SN 2002ap, the Hypernova of Class Ic 
    Pandey, S. B.; Sahu, D. K.; Anupama, G. C.; Bhattacharya, D.; Sagar, R. (2003)
    The supernova SN2002ap was discovered in the outer regions of the nearby spiral M74 on January 29.4 UT. Early photometric and spectroscopic observations indicate the supernova belongs to the class of Ic hypernovae SN 1997ef ...
  • 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 ...
  • Study of three homologous solar flares observed from active region NOAA 9033 on 12th June 2000 
    Verma, V. K.; Vats, H. O. (2003)
    In the paper, we present a study of three homologous Hα flares observed on 12th June 2000 in active region (AR) NOAA 9033. During the observation of AR NOAA 9033 on 12th June 2000, we observed 1st solar flare between ...
  • Wide field CCD photometry of the young open cluster NGC 663 
    Pandey, A. K.; Upadhyay, K.; Ogura, K.; Sagar, R. (2003)
    A deep and wide field CCD photometry of the young open cluster NGC 663 has been carried out. We report preliminary results of our investigations, specifically the determination of the cluster mass function which is found ...
  • Possible microlensing event in the direction of M31 
    Joshi, Y. C.; Pandey, A. K.; Narasimha, D.; Sagar, R. (2003)
    M 31 has been a promising target to search for microlensing events. Consequently a number of groups have started observations towards this galaxy, however, analyzing the observations in the large background of unresolved ...
  • CCD photometry of the unstudied galactic star clusters Be 10, Be 67 and To 5 
    Lata, S.; Mohan, V.; Pandey, A. K.; Sagar, R. (2004-07)
    We present the broad band Johnson UBV and Cousins RI CCD photometric observations for open clusters Be 10, Be 67 and To 5. So far no photometric study of these clusters in published. The colour-magnitude diagrams indicate ...
  • Spectrophotometry of the comet C/2002 V1 (NEAT) 
    Sanwal, B. B.; Kumar, B.; Singh, M. (2004-03)
    The 1.2-m Schmidt telescope at IIalcakala found a comet on November 6, 2002 during the Near Earth Asteroid Tracking (NEAT)and it was reported by S.II.Pravdo. At the time of discovery its magnitude was around 17.3. Several ...
  • ARIES imaging polarimeter 
    Rautela, B. S.; Joshi, G. C.; Pandey, J. C. (2004-09)
    An Imaging Polarimeter has been fabricated for use with liquid- N2 cooled CCD camera and is designed to suit 104-cm Sampurnanand telescope with an f/13 focus at Aryabhatta Research Institute of Observational ...
  • Mass function study of six open clusters Be 10, Be 67, to 5, Be 15, Be 71 and King 1 
    Lata, S. (2005-06)
    In the Present study, we have used the CCD data to determine the luminosity and mass function of six open clusters. Members of clusters are identified using photometric and statistical criteria. From these members, er have ...
  • CCD photometry of the galactic star clusters Be 15, Be 71 and King 1 
    Lata, S.; Mohan, V.; Sagar, R. (2004-12)
    We present U BV RI CCD photometry of three open star clusters Be 15, Be 71 and King 1 for the first time. Base on these data, optical colour- magnitude diagrams (CMDs) for the stars in the clusters down to V = 22 ...
  • Optical observations and multiband modelling of the 
    Misra, K.; Resmi, L.; Pandey, S. B.; Bhattacharya, D.; Sagar, R. (Optical observations and multiband modelling of the, 2005-12)
    We present the CCD Cousins R band photometric observations of the afterglow of GRB 041006. The multiband afterglow evolution is modelled using an underlying `hard' electron energy spectrum with a p₁ ~ 1.3. The burst appears ...
  • Unusual optical quiescence of the classical BL Lac object PKS 0735+178 on intranight time-scale 
    Goyal, A.; Krishna-Gopal; Anupama, G. C.; Sahu, D. K.; Sagar, R.; Britzen, S.; Karouzos, M.; Aller, M. F.; Aller, H. D. (2009)
    We present the result of our extensive intranight optical monitoring of the well-known low- energy peaked BL Lac (LBL) object PKS 0735+178. This long-term follow-up consists of R-band monitoring for a minimum duration ...
  • GRB 000301C with peculiar afterglow emission 
    Sagar, R.; Mohan, V.; Pandey, S. B.; Pandey, A. K.; Stalin, C. S.; Castro-Tirado, A. J. (2000)
    The CCD magnitude in Johnson V and Cousins R and I photometric passbands are determined for GRB 000301C afterglow starting ~ 1.5 day after the γ – ray burst. In fact we provide the earliest optical observations for this ...
  • Stellar contents of the galactic giant HII region NGC 3603 
    Pandey, A. K.; Ogura, K.; Sekiguchi, K. (2000)
    We present CCD UBVRI and Hа photometry for the starburst cluster associated with the galactic giant HII region NGC 3603. The mean reddening of the cluster members comes out to be (E(B-V)) = 1.48±0.21 (s.d.). The surface ...
  • Sky transparently over Naini Tal: a retrospective study 
    Brijesh, K.; Sagar, R.; Rautela, B. S.; Srivastava, J. B.; Srivastava, R. K. (2000)
    We present an analysis of the atmospheric extinction coefficients measured during 1964-1999 in broad-band photometric passbands at U.P. State Observatory, Naini Tal. The extinction properties are also studied from the ...

Search ARIES-IDR


Advanced Search

Browse

My Account

Context