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      https://www.ias.ac.in/article/fulltext/joaa/042/0083

    • Keywords

       

      Stars: individual: AR Sco; X-rays: binaries: novae, cataclysmic variables; white dwarf.s.

    • Abstract

       

      We present our AstroSat soft X-ray observations of a compact binary system, AR Sco, and analysis of its X-ray observations with Chandra that were taken only about a week before the AstroSat observations. An analysis of the soft X-ray (0.3–2.0 keV) data limits the modulation of the spin, orbital, or beat periods to less than 0.03 counts s$^{-1}$ or <10% of the average count rate. The X-ray flux obtainedfrom both observatories is found to be almost identical (within a few percent) in flux, and about 30% lower than reported from the nine months older observations with XMM-Newton. A two-temperature thermal plasma model with the same spectral parameters fit Chandra and AstroSat data very well, and requires very little absorption in the line of sight to the source. The low-temperature component has thesame temperature ($\sim$1 keV) as reported earlier, but the high-temperature component has a lower temperature of $5.0^{+0.8}_{-0.7}$ keV as compared to 8.0 keV measured earlier, however, the difference is not statistically significant.

    • Author Affiliations

       

      K. P. SINGH1 V. GIRISH2 J. TIWARI1 P. E. BARRETT3 D. A. H. BUCKLEY4 S. B. POTTER4 5 E. SCHLEGEL6 V. RANA7 G. STEWART8

      1. Indian Institute of Science Education and Research Mohali, SAS Nagar, Sector 81, Mohali 140 306, India.
      2. Indian Space Research Organisation HQ, New BEL Road, Bengaluru 560 094, India.
      3. The George Washington University, 725 21st St. NW, Washington, DC 20052, USA.
      4. South African Astronomical Observatory, PO Box 9, Observatory Road, Observatory, Cape Town 7935, South Africa.
      5. Department of Physics, University of Johannesburg, PO Box 524, Auckland Park 2006, South Africa.
      6. The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA.
      7. Raman Research Institute, C. V. Raman Avenue, Sadashivanagar, Bengaluru 560 080, India.
      8. Department of Physics and Astronomy, The University of Leicester, University Road, Leicester LE1 7RH, UK.
    • Dates

       
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      Posted on January 27, 2016

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