Long-term X-ray variability of Circinus X-1

Details Long-term X-ray variability of Circinus X-1 Long-term X-ray variability of Circinus X-1

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.5404s&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #54.04; Bulletin of the American Astronomical Society, Vol. 34, p.1199

Astronomy and Astrophysics

Astronomy

Scientific paper

We present an analysis of long term X-ray monitoring observations of Circinus X-1 (Cir X-1) made with four different instruments: Vela 5B, Ariel V ASM, Ginga ASM, and RXTE ASM, over the course of more than 30 years. We use Lomb-Scargle periodograms to search for the 16.5 day orbital period of Cir X-1 in each of these data sets and from this derive a new orbital ephemeris based solely on X-ray measurements, which we compare to the previous ephemerides obtained from radio observations. We obtain dynamic periodograms (both Lomb-Scargle and PDM) of Cir X-1 during the RXTE era, showing the period evolution of Cir X-1, and also displaying some unexplained discrete jumps in the location of the peak power.

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