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The young Be-star binary Circinus X-1

Published online by Cambridge University Press:  30 December 2019

Norbert S. Schulz ,
Timothy E. Kallman ,
Sebastian Heinz ,
Paul Sell Open the ORCID record for Paul Sell [Opens in a new window] ,
Peter Jonker  and
William N. Brandt
Norbert S. Schulz
Affiliation:
Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA email: nss@space.mit.edu
Timothy E. Kallman
Affiliation:
Goddard Space Flight Center, NASA, Green Belt, MD, USA email: tim@milkyway.gsfc.nasa.gov
Sebastian Heinz
Affiliation:
Department of Astronomy, University of Wisconsin, Madison, WI, USA email: heinzs@astro.wisc.edu
Paul Sell
Affiliation:
Department of Physics, University of Crete, Heraklion, Greece email: psell@physics.uoc.gr
Peter Jonker
Affiliation:
Department of Astrophysics, Radboud University, Nijmegen, The Netherlands email: peterj@sron.nl
William N. Brandt
Affiliation:
Department of Astronomy & Astrophysics, 525 Davey Laboratory, The Pennsylvenia State Univerity, University Park, PA, USA email: niel@astro.psu.edu
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Abstract

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Cir X-1 is a young X-ray binary exhibiting X-ray flux changes of four orders of magnitude over several decades. It has been observed many times since the launch of the Chandra X-ray Observatory with high energy transmission grating spectrometer and each time the source gave us a vastly different look. At its very lowest X-ray flux we found a single 1.7 keV blackbody spectrum with an emission radius of 0.5 km. Since the neutron star in Cir X-1 is only few thousand years old we identify this as emission from an accretion column since at this youth the neutron star is assumed to be highly magnetized. At an X-ray flux of 1.8×10−11 erg cm−2 s−1 this implies a moderate magnetic field of a few times of 1011 G. The photoionized X-ray emission line properties at this low flux are consistent with B5-type companion wind. We suggest that Cir X-1 is a very young Be-star binary.

Keywords

stars: neutronX-rays: binariestechniques: spectroscopic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 125 - 130
Copyright
© International Astronomical Union 2019 

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