Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17099h&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
We have analyzed 172 RXTE, USA, ASCA, GINGA, ROSAT and EXOSAT mid-eclipse time measurements for the LMXB EX 0748-676, and 45 RXTE, BeppoSAX, and SAS-3 measured mid-eclipse times for the transient LMXB X1658-298. For EXO 0748-676 we find a large positive orbital period derivative and a rapid time-scale for orbital evolution (τ_orb = 2.0 × 10^7 yr). For X1658-298 our observations show that the orbital period is likely decreasing with a time-scale of τ_orb = 2.0 × 10^8 yr. However, a model for the eclipse timings with no period evolution can not be ruled out based on our data for X1658-298. The positive orbit period derivative in EXO 0748-676 is difficult to understand in the context of current models of LMXB evolution. In the case of X1658-298 the period derivative appears close to values predicted by some LMXB evolutionary calculations. We apply maximum likelihood statistical methods to these data to quantify the intrinsic orbit period variability for both systems over the past 20 years. We update the orbital ephemerides for both systems and report the results of our program of eclipse observations with USA and RXTE.
Bandyopadhyay Reba M.
Hertz Paul L.
Ray Paul Shelton
Smale Alan P.
Wolff Michael Thomas
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