USA experiment observation of spectral and timing evolution during the 2000 outburst of XTE J1550-564

被引：8

作者：

Reilly, KT ^{[1
]}

Bloom, ED

Focke, W

Giebels, B

Godfrey, G

Parkinson, PMS

Shabad, G

Ray, PS

Bandyopadhyay, RM

Wood, KS

Wolff, MT

Fritz, GG

Hertz, P

Kowalski, MP

Lovellette, MN

Yentis, DJ

Scargle, JD

机构：

[1] Stanford Univ, Stanford Linear Accelerator Ctr, Stanford, CA 94309 USA

[2] USN, Res Lab, EO Hulburt Ctr Space Res, Washington, DC 20375 USA

[3] NASA, Ames Res Ctr, Div Space Sci, Moffett Field, CA 94305 USA

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 561卷 / 02期

基金：

美国国家航空航天局;

关键词：

accretion; accretion disks; binaries : general; stars : individual (XTE J1550-564); X-rays : stars;

D O I：

10.1086/324756

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on timing and spectral observations of the 2000 outburst of XTE J1550-64 made by the Unconventional Stellar Aspect (USA) experiment on board the Advanced Research and Global Observation Satellite (ARGOS). We observe a low-frequency quasi-periodic oscillation with a centroid frequency that tends to increase with increasing flux and a fractional rms amplitude that is correlated with the hardness ratio. Several high-frequency quasi-periodic oscillations were detected by Rossi X-Ray Timing Explorer during periods where the low-frequency quasi-periodic oscillation was seen to be weakening or not detectable at all. The evolution of the hardness ratio (4-16 keV/1-4 keV) with time and source flux is examined. The hardness-intensity diagram shows a cyclical movement in the counterclockwise direction and possibly indicates the presence of two independent accretion flows: a thin-disk flow and a hot sub-Keplerian flow.

引用

页码：L183 / L186

页数：4

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