Simultaneous X-ray and optical observations of the 7.7 second X-ray pulsar 4U 1626-67

Abstract

view Abstract Citations (37) References (9) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Simultaneous X-ray and optical observations of the 7.7 second 5> X-ray pulsar 4U 1626-67. McClintock, J. E. ; Canizares, C. R. ; Li, F. K. ; Grindlay, J. E. Abstract Simultaneous X-ray and optical observations of the 7.7-s X-ray pulsar 4U 1626-67, obtained during May 29-31, 1978, reveal the presence of (1) intense, correlated optical and X-ray flares and (2) 7.7-s optical pulsations which agree in phase with the 1-3 keV X-ray pulsations to within 0.5 s (two standard deviations) and which agree in period to within 0.001 s (one standard deviation). From these data it is concluded that a substantial fraction (a minimum of 8%) and possibly all of the optical emission is produced from within approximately 0.5 light sec or 1.5 x 10 to the 10th cm of the neutron star. Furthermore, the data rule out the possibility that this optical emission comes from the X-ray heated surface of a degenerate or nondegenerate dwarf companion. It most likely comes from an accretion disk. Publication: The Astrophysical Journal Pub Date: January 1980 DOI: 10.1086/183163 Bibcode: 1980ApJ...235L..81M Keywords: Pulsars; Visual Observation; X Ray Astronomy; X Ray Stars; Flares; Light Emission; Neutron Stars; Astronomy full text sources ADS | data products SIMBAD (2)