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      Galactic Bulge accreting binaries spectroscopy

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      Creators
      Perez Torres, M.A.
      Jonker, P.G.
      Britt, C.
      Johnson, C.B.
      Hynes, R.I.
      Greiss, S.
      Steeghs, D.
      Maccarone, T.J.
      Ozel, F.
      Bassa, C.
      Nelemans, G.A.
      Date of Archiving
      2015
      Archive
      VizieR Online Data Catalog
      Related links
      http://vizier.cfa.harvard.edu/viz-bin/VizieR?-source=J/MNRAS/440/365
      Publication type
      Dataset
      Access level
      Open access
      Please use this identifier to cite or link to this item: https://hdl.handle.net/2066/156385   https://hdl.handle.net/2066/156385
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      Organization
      Astrophysics
      Audience(s)
      Astronomy, astrophysics
      Key words
      accretion; accretion discs; black hole physics; techniques; radial velocities; binaries; close - stars: neutron; X-rays
      Abstract
      We present the identification of optical counterparts to 23 GBS X-ray sources. All sources are classified as accreting binaries according to the emission-line characteristics inferred from medium-resolution spectroscopy. To distinguish accreting binaries from chromospherically active objects, we develop criteria based on Hα and Hei λλ5786, 6678 emission-line properties available in the literature. The spectroscopic properties and photometric variability of each object is discussed and a classification is given where possible. At least 12 of the 23 systems show an accretion-dominated optical spectrum and another 6 show stellar absorption features in addition to emission lines indicating that they are probably accreting binaries in quiescence or in a low accretion rate state. Two sources are confirmed to be eclipsing: CX207 and CX794. CX207 is likely a magnetic cataclysmic variable (CV), while CX794 is a nova-like CV in the period gap. Finally, the large broadening (2100 km/s FWHM) of the Hα emission lines in CX446 and CX1004 suggests that they are also high-inclination or even eclipsing systems. Whether the compact object is a white dwarf in an eclipsing CV, a neutron star or a black hole in a high-inclination low-mass X-ray binary remains to be established.
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