INTEGRAL observations of Hercules X-1

被引：38

作者：

Klochkov, D. ^{[1
]}

Staubert, R. ^{[1
]}

Postnov, K. ^{[3
]}

Shakura, N. ^{[3
]}

Santangelo, A. ^{[1
]}

Tsygankov, S. ^{[2
]}

Lutovinov, A. ^{[2
]}

Kreykenbohm, I. ^{[1
,4
]}

Wilms, J. ^{[5
]}

机构：

[1] Univ Tubingen, Inst Astron & Astrophys, D-72076 Tubingen, Germany

[2] Moscow Space Res Inst, Moscow 117997, Russia

[3] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992, Russia

[4] INTEGRAL Sci Data Ctr, CH-1290 Versoix, Switzerland

[5] Univ Erlangen Nurnberg, Dr Karl Remeis Sternwarte, Astron Inst, D-96049 Bamberg, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2008年 / 482卷 / 03期

关键词：

X-rays : binaries; accretion; accretion disks; stars : neutron;

D O I：

10.1051/0004-6361:20078953

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. We investigate the X-ray spectral and timing properties of the accreting X-ray pulsar Her X-1 observed with the INTEGRAL satellite in July-August 2005. Methods. The data analyzed in this work cover a substantial part of one main-on state of the source. The short time scale pulse period development is measured. X-ray pulse profiles for different energy ranges and time intervals are constructed. Pulse-averaged and pulse-phase resolved broad band X-ray spectra are studied. Spectral changes during X-ray dips are explored. Results. The X-ray pulse profiles are found to change significantly during the period of observations. For the first time a strong spin-up is measured within one 35 d cycle. Spectral characteristics observed during the X-ray dips are consistent with their interpretation as being due to partial covering as has been reported by several authors. The fundamental cyclotron absorption line is firmly observed in both pulse-averaged and pulse-phase resolved X-ray spectra. The energy, width, and the depth of the line are found to vary significantly with pulse phase.

引用

页码：907 / 915

页数：9

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