THE ORBITAL PERIOD OF SWIFT J1626.6-5156


BAYKAL A., GÖĞÜŞ E., İNAM S. Ç. , Belloni T.

ASTROPHYSICAL JOURNAL, vol.711, no.2, pp.1306-1309, 2010 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 711 Issue: 2
  • Publication Date: 2010
  • Doi Number: 10.1088/0004-637x/711/2/1306
  • Journal Name: ASTROPHYSICAL JOURNAL
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.1306-1309
  • Keywords: accretion, accretion disks, stars: neutron, X-rays: binaries, X-rays: individual (Swift J1626.6-5156), BE/X-RAY BINARIES, SPACED DATA, PULSAR, OUTBURSTS, STARS

Abstract

We present the discovery of the orbital period of Swift J1626.6-5156. Since its discovery in 2005, the source has been monitored with Rossi X-Ray Timing Explorer, especially during the early stage of the outburst and into the X-ray modulating episode. Using a data span of similar to 700 days, we obtain the orbital period of the system as 132.9 days. We find that the orbit is close to a circular shape with an eccentricity 0.08, that is one of the smallest among Be/X-ray binary systems. Moreover, we find that the timescale of the X-ray modulations varied, which led to earlier suggestions of orbital periods at about a third and half of the orbital period of Swift J1626.6-5156.