Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.1008c&link_type=abstract
American Astronomical Society, HEAD meeting #10, #10.08
Astronomy and Astrophysics
Astronomy
Scientific paper
The transient X-ray source XTE J1859+083, which has a pulse period of 9.8s, was discovered with RXTE in 1999. There have been no reports of more recent detections of this source. We present here observations of this pulsar made with the All-Sky Monitor (ASM) and Proportional Counter Array (PCA) on board RXTE, and the Wide Field Cameras (WFC) on board BeppoSax. Eighteen sets of PCA observations were obtained over an approximately one month period in 1999. The ASM data cover a 12 year time interval and show that an extended outburst occurred between approximately MJD 50,250 and 50,460. The ASM data excluding this outburst interval suggest a possible 61 day modulation. The PCA flux and pulse timing measurements are consistent with this possible period. Observations with the WFC during the outburst give an error box which is consistent with the PCA error box but is significantly smaller. The transient nature of XTE J1859+083 and the length of its pulse period are consistent with it being a Be/neutron star binary. The possible 61 day orbital period would be of the expected length for a Be star system with a 9.8s pulse period.
Corbet Robin H. D.
in't Zand Jean J. M.
Levine Alan M.
Marshall Francis E.
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