XMM-Newton EPIC & OM observations of Her X-1 over the 35 d beat period and an anomalous low state

被引：0

作者：

Zane, S ^{[1
]}

Ramsay, G ^{[1
]}

Jimenez-Garate, MA ^{[1
]}

den Herder, JW ^{[1
]}

Still, M ^{[1
]}

Boyd, PT ^{[1
]}

Hailey, CJ ^{[1
]}

机构：

[1] Univ Coll London, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England

来源：

Interacting Binaries: Accretion, Evolution, and Outcomes | 2005年 / 797卷

关键词：

accretion and accretion disks; stars : neutron; pulsars : individual (Her X-1); X-rays : stars;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present the results of a series of XMM-Newton EPIC and OM observations of Her X-1, spread over a wide range of the 35 d precession period. We confirm that the spin modulation of the neutron star is weak or absent in the low state - in marked contrast to the main or short-on states. The strong fluorescence emission line at similar to 6.4 keV is detected in all observations (apart from one taken in the middle of eclipse), with higher line energy, width and normalisation during the main-on state. In addition, we report the detection of a second line near 7 keV in 10 of the 15 observations taken during the low-intensity states of the system. We discuss these observations in the context of previous observations, investigate the origin of the soft and hard X-rays and consider the emission site of the 6.4keV and 7keV emission lines.

引用

页码：507 / 512

页数：6

共 29 条

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Zane, S
Ramsay, G
Jimenez-Garate, MA
den Herder, JW
Hailey, CJ
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2004, 350 (02) : 506 - 516
[2] XMM-Newton EPIC observations of Her X-1
Ramsay, G
Zane, S
Jimenez-Garate, MA
den Herder, JW
Hailey, CJ
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[3] XMM-Newton EPIC observations of the ultraluminous X-ray source NGC 5204 X-1
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SIAM PHYSICS CONGRESS 2017 (SPC2017), 2017, 901
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[9] The 1999 Her X-1 Anomalous Low State
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FIFTH COMPTON SYMPOSIUM, 2000, 510 : 158 - 162
[10] X-ray observations during a Her X-1 anomalous low-state
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ASTRONOMY & ASTROPHYSICS, 1999, 350 (01) : L5 - L8

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