Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...486.1000h&link_type=abstract
Astrophysical Journal v.486, p.1000
Astronomy and Astrophysics
Astronomy
16
Stars: Binaries: Eclipsing, X-Rays: Stars, Stars: Individual Alphanumeric: Exo 0748-676
Scientific paper
The rare eclipsing low-mass X-ray binary EXO 0748-676 has now been monitored accurately for over a decade in the hope of detecting orbital period evolution. We report observations of 10 complete eclipses at resolution less than 0.1 s with the Rossi X-ray Timing Explorer during 1996 May and 1996 August. We have timed the eclipses with an accuracy limited by photon statistics to 0.2--0.5 s. When combined with historical measurements, the eclipse timings imply an unexpectedly large orbital period derivative, P dot _{{orb}}=3.3x10^{-11} , and a rapid timescale for orbital evolution, tau orb = 1.3 x 107 yr. The observations also require considerable intrinsic jitter in the mideclipse timings; a maximum likelihood estimate is 0.15 s per orbital cycle. We consider various models and scenarios that might account for these unexpected results.
Cominsky Lynn R.
Hertz Paul
Wood Kent S.
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