On the symbiotic x-ray binary nature of the star CGCS 5926

N. Masetti, U. Munari, A. A. Henden, K. L. Page, J. P. Osborne, Sumner Starrfield

Research output: Contribution to journalArticlepeer-review


We report on multiwavelength (from X-ray to optical) follow up observations of a carbon star CGCS 5926, motivated by the fact that it is positionally coincident with a faint X-ray source of the ROSAT catalog, thus suggesting its possible symbiotic X-ray binary (SyXB) nature. Our optical spectroscopy confirms that this is a carbon star of type C(6,2). This allows us to infer for CGCS 5926 a distance of ∼5 kpc. BVRCIC photometry of the star shows variability of ∼ 0.3 mag with a periodicity of 151 days, which we interpret as due to radial pulsations. The source is not detected with the Swift satellite in X-rays down to a 0.3-10 keV luminosity of ∼3 × 1032 ergs-1. This nondetection is apparently in contrast with the ROSAT data; however, the present information does not rule out that CGCS 5926 can be a SyXB. This will be settled by more sensitive observations at high energies.

Original languageEnglish (US)
Pages (from-to)206-209
Number of pages4
JournalBaltic Astronomy
Issue number1-2
StatePublished - 2012


  • Stars: Carbon, agb
  • Stars: Individual (cgcs 5926)
  • Stars: Oscillations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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