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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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)).

Název v anglickém jazyce

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

Popis výsledku anglicky

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)).

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

<a href="/cs/project/GA13-33324S" target="_blank" >GA13-33324S: Rentgenový monitor račí oko</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

Golden Age of Cataclysmic Variables and Related Objects – IV

ISBN

—

ISSN

1824-8039

e-ISSN

1824-8039

Počet stran výsledku

11

Strana od-do

—

Název nakladatele

SISSA/ISAS

Místo vydání

Trieste

Místo konání akce

Palermo

Datum konání akce

11. 9. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—