X-ray outbursts and high-state episodes of HETE J1900.1-2455

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F18%3A00495461" target="_blank" >RIV/67985815:_____/18:00495461 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1093/mnras/sty575" target="_blank" >http://dx.doi.org/10.1093/mnras/sty575</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1093/mnras/sty575" target="_blank" >10.1093/mnras/sty575</a>

Result language
angličtina
Original language name
X-ray outbursts and high-state episodes of HETE J1900.1-2455
Original language description
HETEJ1900.1-2455 is an ultra-compact low-mass X-ray binary that underwent a long-lasting (about 10 yr) active state. The analysis presented here of its activity uses the observations of RXTE/ASM, Swift/BAT, and ISS/MAXI for investigating this active state and the relation of time evolution of fluxes in the hard and medium X-ray bands. We show that the variations of the flux of HETEJ1900.1-2455 on the time-scales of days and weeks have the form both of the outbursts and occasional high-state episodes. These outbursts are accompanied by the large changes of the hardness of the spectrum in the surroundings of the peaks of their soft X-ray flux. The very strong peaks of these outbursts occur in the soft X-ray band (2-4 keV) and are accompanied by a large depression in the 15-50 keV band flux. We interpret these events as an occasional occurrence of a thermal viscous instability of the accretion disc that gives rise to the outbursts similar to those in the soft X-ray transients. On the other hand, the 2-4 and the 15-50 keV band fluxes are mutually correlated in the high-state episodes, much longer than the outbursts. In the interpretation, the episodes of the X-ray high states of HETEJ1900.1-2455 during the active state bear some analogy with the standstills in the Z Cam type of cataclysmic variables.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)

Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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