The long-term activity of dwarf novae and soft X-ray transients

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F17%3A00327813" target="_blank" >RIV/68407700:21230/17:00327813 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.22323/1.315.0035" target="_blank" >http://dx.doi.org/10.22323/1.315.0035</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.22323/1.315.0035" target="_blank" >10.22323/1.315.0035</a>

Result language

angličtina

Original language name

The long-term activity of dwarf novae and soft X-ray transients

Original language description

We show the activity of dwarf novae (DNe) and soft X-ray transients (SXTs) which were observed to undergo series of relatively frequent outbursts. The length of the recurrence time of these events, TC, is usually less than a year (at most about 4 years). We show that the energy output (e.g. fluence) sometimes largely differs even for the neighboring outbursts both of DNe and SXTs. This energy output is related to the fraction of the disk mass, accreted during an outburst, but this difference of the energy output does not influence the length of TC in a given object. The length of TC in a given DN or SXT is variable, but the occurrence of these outbursts is not dramatically irregular in most cases. The long-term trends can be clearly resolved in the O–C diagrams of TC but they show only small epoch-to-epoch fluctuations. In DNe, the disk zone where the outburst starts can change even in a given binary for the individual outbursts. The decaying branch of the outburst is governed by propagation of cooling front and the observations show that this part of the light curve reproduces well for the ensemble of outbursts in a given DN. As for SXTs, the final phase of the decay in the 1.5–12 keV band reproduces well for the individual outbursts while the preceding phase can vary for the individual events. We also show an analogy of the Z Cam-type behavior in an SXT (transitions between the segments of a hot thermally stable (in standstills) and unstable disk (outbursts)).

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA13-33324S" target="_blank" >GA13-33324S: Lobster Eye X-Ray Monitor</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Golden Age of Cataclysmic Variables and Related Objects – IV

ISBN

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ISSN

1824-8039

e-ISSN

1824-8039

Number of pages

11

Pages from-to

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Publisher name

SISSA/ISAS

Place of publication

Trieste

Event location

Palermo

Event date

Sep 11, 2017

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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