Search for orbital X-ray variation in Scorpius X-1

Autor:	W. C. Priedhorsky, S. S. Holt
Rok vydání:	1987
Předmět:	Physics Atomic orbital Space and Planetary Science Binary star Phase (waves) Sigma Astronomy and Astrophysics Astrophysics Emission spectrum Orbital period Light curve Spectral line
Zdroj:	The Astrophysical Journal. 312:743
ISSN:	1538-4357 0004-637X
DOI:	10.1086/164918
Popis:	All 5 yr of 3-6 keV monitoring of Sco X-1 by the Ariel 5 all-sky monitor have been reanalyzed to search more sensitively for variation at the 0.787313 d orbital period. The best limits on orbital variations come from data selected to exclude active episodes. Any narrow absorption dip has an average depth less than 1.0 percent (0.1/Delta Phi), where Delta Phi is the width in units of the orbital period (2 sigma confidence level). A weak (0.4 percent) sinusoidal modulation, with 3.2 sigma significance, reaching minimum at phase 0.59 + or - 0.06 with respect to superior conjunction of the optical emission-line source is observed. In any case, the upper limit to a sinusoidal orbital modulation is 0.7 percent. Sco X-1 never - at least not for more than 2 hrs - dipped below its normal quiescent level.
Databáze:	OpenAIRE
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