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Browsing by Author "Pandey, J. C."

Browsing by Author "Pandey, J. C."

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  • 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 ...
  • 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 ...
  • Authenticating the Presence of a Relativistic Massive Black Hole Binary in OJ 287 Using Its General Relativity Centenary Flare: Improved Orbital Parameters. 
    Dey, Lankeswar et al.; Gopinathan, M.; Joshi, A.; Pandey, J. C. (Astrophysical journal, 2018-10)
    Results from regular monitoring of relativistic compact binaries like PSR 1913+16 are consistent with the dominant (quadrupole) order emission of gravitational waves (GWs). We show that observations associated with the ...
  • Broad-band optical polarimetric study of IC 1805 
    Medhi, B. J; Maheswar, G.; Brijesh, K.; Pandey, J. C.; Kumar, T. S.; Sagar, R. (2007)
    We present the BVR broad-band polarimetric observations of 51 stars belonging to the young open cluster IC 1805. Along with the photometric data from the literature, we have modelled and subtracted the foreground dust ...
  • BVRI photometric and polarimetric studies of W UMa type eclipsing binary FO Hydra 
    Prasad, V.; Pandey, J. C.; Patel, M. K.; Srivastava, D. C. (2013)
    We present analysis of optical photometric and polarimetric observations of contact binary system FO Hydra (FO Hya). The computed period of the system is 0.469556 ± 0.000003 days. An O–C curve analysis indicates an increase ...
  • Evidence of multiple slow acoustic oscillations in the stellar flaring loops of proxima centaur 
    Srivastava, A. K.; Lalitha, S.; Pandey, J. C. (The American Astronomical Society, 2013)
    We present the first observational evidence of multiple slow acoustic oscillations in the post-flaring loops of the corona of Proxima Centauri using XMM-Newton observations. We find the signature of periodic oscillation ...
  • A flattening in the optical light curve of SN 2002ap 
    Pandey, S. B.; Anupama, G. C.; Sagar, R.; Bhattacharya, D.; Sahu, D. K.; Pandey, J. C. (2003)
    We present the UBVRc I c broad-band optical photometry of the type Ic supernova SN 2002ap obtained during 2002 February 6–March 23 in the early decline phases and also later on 2002 August 15. Combining these data with the ...
  • 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 ...
  • FR Cnc revisited: photometry, polarimetry and spectroscopy 
    Golovin, A. et. al.; Pandey, J. C. (2012)
    This paper is part of a multiwavelength study aimed at using complementary photometric, polarimetric and spectroscopic data to achieve an understanding of the activity process in late-type stars. Here, we present the ...
  • India-TMT project—science instrumentation program 
    Sivarani, Thirupathi ,et.al.; Pandey, Shashi Bhushan; Pandey, J. C. (Journal Astrophysical Astronomy, 2022-12)
    The future of astronomy in the coming decades will be shaped by the upcoming three extremely large optical telescopes, the Thirty Meter Telescope (TMT), the Giant Magellan Telescope (GMT) and the European Large Telescope ...
  • Li Distribution, Kinematics, and Detailed Abundance Analysis among Very Metal-poor Stars in the Galactic Halo from the HESP-GOMPA Survey 
    Bandyopadhyay, Avrajit ,et.al.; Pandey, J. C. (The Astrophysical Journal, 2022-10)
    We present a study on the detailed elemental abundances of newly identified, bright, very metal-poor stars with the detection of lithium, initially observed as part of the SDSS/MARVELS pre-survey. These stars were selected ...
  • LO Pegasi: an investigation of multiband optical polarization 
    Pandey, J. C.; Medhi, B. J.; Sagar, R.; Pandey, A. K. (2009)
    We present BVR polarimetric study of the cool active star LO Pegasi (LO Peg) for the first time. LO Peg was found to be highly polarized among the cool active stars. Our observations yield average values of polarization ...
  • A multiwavelength polarimetric study towards the open cluster NGC1893 
    Eswaraiah, C.; Pandey, A. K.; Maheswar, G.; Medhi, B. J.; Pandey, J. C. (2011)
    We present multiwavelength linear polarimetric observations for 44 stars of the NGC1893 young open cluster region along with V-band polarimetric observations of stars of four other open clusters located between l ∼ 160◦ ...
  • Multiwavelength studies of five chromospherically active stars 
    Pandey, J. C.; Singh, K. P.; Sagar, R.; Drake, S. A. (2007)
    We present a multiwavelength study of five chromospherically active stars, including newly obtained optical photometry, low-resolution optical spectroscopy, as well as archival X-ray observations. The bulk of the ...
  • Multiwavelength study of a young open cluster NGC 7419 
    Joshi, H.; Kumar, B.; Singh, K. P.; Sagar, R.; Sharma, S.; Pandey, J. C. (2008)
    Using new UBVRI Hα CCD photometric observations and the archival infrared and X-ray data, we have carried out a multiwavelength study of a Perseus arm young open star cluster NGC 7419. ...
  • Multiwavelength Study of the NGC281 Region 
    Sharma, S. et. al.; Pandey, A. K.; Pandey, J. C. (2012)
    We present a multiwavelength study of the NGC281 complex, which contains the young cluster IC1590 at the center, using deep wide-field optical UBVIc photometry, slitless spectroscopy along with archival data sets in ...
  • 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 ...
  • Observations of X-ray flares on π¹ UMa 
    Pandey, J. C. (2015)
    We investigate the properties of the quiescent and flaring coronae of an active solar-type star π¹ UMa using XMM–Newton observation. The present data show that the quiescent state coronae of π¹ UMa consist of two temperatures ...
  • Observations of x-ray oscillation in ξ Boo: evidence of a fast-kink mode in the stellar loops 
    Pandey, J. C.; Srivastava, A. K. (2009-05-12)
    We report the observations of X-ray oscillations during the flare in a cool active star ξ Boo for the first time. ξ Boo was observed by EPIC/MOS of the XMM-Newton satellite. The X-ray light curve is in- vestigated with ...
  • On the Differential Rotation of Stars. 
    Savanov, I. S.; Dmitrienko, E. S.; Pandey, J. C.; Karmakar, S. (Astrophysical Bulletin, 2018-10)
    We discuss methods for analyzing the observational manifestations of differential rotation (DR). Based on the literary sources and our estimates (for 4 cool dwarfs), a list containing 75 stars was compiled. Using an ...

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