X-ray variability of Scorpius X-1 during a multiwavelength campaign

Details X-ray variability of Scorpius X-1 during a multiwavelength campaign X-ray variability of Scorpius X-1 during a multiwavelength campaign

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396..201h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 1, Sept. 1, 1992, p. 201-218. Research supported by NASA and U.S.

Astronomy and Astrophysics

Astrophysics

32

Color-Color Diagram, Scorpius Constellation, Stellar Mass Accretion, Variable Stars, X Ray Binaries, Companion Stars, Ginga Satellite, Neutron Stars, X Ray Sources

Scientific paper

Consideration is given to the X-ray variability of Scorpius X-1, which was observed with Ginga on March 9-11, 1989 as part of a multiwavelength campaign. The temporal characteristics observed, including quasi-periodic oscillations, HF noise, and VLF noise, are consistent with previous observations of Sco X-1. Quasi-periodic oscillations are observed on both the normal branch and the lower flaring branch, but not on the upper flaring branch. Limits are placed on the fractional rms variation of quasi-period oscillations on the upper flaring branch of less than or approximately equal to 2 percent of the total intensity. The characteristics of the observed red noise components are found to vary along the flaring branch. The fractional rms variation of VLF noise increases from less than 2 to greater than 6 percent as Sco X-1 moves from the flaring branch-normal branch vertex to the upper end of the flaring branch.

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