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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/035/01/0039-0054

    • Keywords

       

      Open clusters and associations: X-rays; stars: pre-main sequence; stars: Individual (BD+56 526, LAV 796, LAV 1174, SHM2002 3734, V553 Car, V557 Car); stars: X-rays.

    • Abstract

       

      We present, for the first time, an analysis of seven intense X-ray flares observed from six stars (LAV 796, LAV 1174, SHM2002 3734, 2MASS 02191082+5707324, V553 Car, V557 Car). These stars are located in the region of young open star clusters NGC 869 and IC 2602. These flares detected in the XMM-Newton data show a rapid rise (10–40 min) and a slow decay (20–90 min). The X-ray luminosities during the flares in the energy band 0.3–7.5 keV are in the range of 1029.9 to 1031.7 erg s-1. The strongest flare was observed with the ratio ∼ 13 for count rates at peak of the flare to the quiescent intensity. The maximum temperature during the flares has been found to be ∼ 100 MK. The semi-loop lengths for the flaring loops are estimated to be of the order of 1010 cm. The physical parameters of the flaring structure, the peak density, pressure and minimum magnetic field required to confine the plasma have been derived and found to be consistent with flares from pre-main sequence stars in the Orion and the Taurus-Auriga-Perseus region.

    • Author Affiliations

       

      Himali Bhatt1 J. C. Pandey2 K. P. Singh3 Ram Sagar2 Brijesh Kumar2

      1. Astrophysical Sciences Division, Bhabha Atomic Research Center, Trombay, Mumbai 400 085, India.
      2. Aryabhatta Research Institute of Observational Sciences, Manora Peak, Nainital 263 129, India.
      3. Tata Institute of Fundamental Research, Mumbai 400 005, India.

    • Dates

       
      Published
      March 2014
      Manuscript received
      17 June 2013
      Accepted
      27 December 2013

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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