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Titolo: Spectral variability of the X-ray pulsar Hercules X-1
Autore: Lutovinov, AA; Grebenev, SA; Pavlinsky, MN; Sunyaev, RA;
- Indirizzi:
- Russian Acad Sci, Inst Space Res, Moscow 117810, Russia Russian Acad Sci Moscow Russia 117810 t Space Res, Moscow 117810, Russia Max Planck Inst Astrophys, D-86740 Garching, Germany Max Planck Inst Astrophys Garching Germany D-86740 740 Garching, Germany
- Titolo Testata:
- ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS
fascicolo: 11,
volume: 26,
anno: 2000,
pagine: 691 - 698
- SICI:
- 1063-7737(200011)26:11<691:SVOTXP>2.0.ZU;2-P
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- 35 DAY CYCLE; LOW STATE; CLOCK; UHURU;
- Keywords:
- pulsars; neutron stars; X-ray sources; scattering;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Physical, Chemical & Earth Sciences
- Citazioni:
- 29
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Lutovinov, AA Russian Acad Sci, Inst Space Res, Profsoyuznaya Ul 84-32, Moscow 117810, Russia Russian Acad Sci Profsoyuznaya Ul 84-32 Moscow Russia 117810
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- Citazione:
- A.A. Lutovinov et al., "Spectral variability of the X-ray pulsar Hercules X-1", ASTRON LETT, 26(11), 2000, pp. 691-698
Abstract
We present the results of our comparative timing and spectral analysis of the high and low (off) states in the X-ray pulsar Her X-1 based on data from the ART-P telescope onboard the Granat observatory. A statistically significant (several mCrab) persistent flux with a simple power-law spectrum wasdetected during the low state. The spectral slope changed from observationto observation by almost a factor of 2. Pulsations were detected only during the high state of the source, when its flux was a factor of similar to 25 larger than the low-state flux. The spectral shape of Her X-1 in its highstate was complex, with the parameters depending on pulse phase. (C) 2000 MAIK "Nauka/Interperiodica".
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/05/13 alle ore 10:47:09