Properties of the long-term optical activity of the prototype polar AM Herculis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F16%3A00470074" target="_blank" >RIV/67985815:_____/16:00470074 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21230/16:00301741

Výsledek na webu

<a href="http://dx.doi.org/10.1093/mnras/stw1964" target="_blank" >http://dx.doi.org/10.1093/mnras/stw1964</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stw1964" target="_blank" >10.1093/mnras/stw1964</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Properties of the long-term optical activity of the prototype polar AM Herculis

Popis výsledku v původním jazyce

The author shows that the character of this activity changed considerably on time-scales of years, which is reflected in a large evolution of the complicated histogram of the optical brightness. The high states are not the well-defined, narrow levels of brightness. I also show that AM Her displays transitions between the high and low states with the intermittently existing cycles. The longest uninterrupted series of transitions from the high to low state consists of seven episodes (about 6 yr). The existence of this series can be controlled by the lifetime of the active regions on the donor, which modulates the mass transfer rate. I show that the episodes of the high and low states accumulate in clusters, which produces an additional cycle after smoothing by the moving averages. The cycles of activity of the donor can explain this modulation. A single isolated short episode of the low state does not imply a break of this cycle. I also argue that the specific properties of star-spots and their migration caused by the differential rotation of the donor would be needed to explain the complex activity of AM Her.

Název v anglickém jazyce

Properties of the long-term optical activity of the prototype polar AM Herculis

Popis výsledku anglicky

The author shows that the character of this activity changed considerably on time-scales of years, which is reflected in a large evolution of the complicated histogram of the optical brightness. The high states are not the well-defined, narrow levels of brightness. I also show that AM Her displays transitions between the high and low states with the intermittently existing cycles. The longest uninterrupted series of transitions from the high to low state consists of seven episodes (about 6 yr). The existence of this series can be controlled by the lifetime of the active regions on the donor, which modulates the mass transfer rate. I show that the episodes of the high and low states accumulate in clusters, which produces an additional cycle after smoothing by the moving averages. The cycles of activity of the donor can explain this modulation. A single isolated short episode of the low state does not imply a break of this cycle. I also argue that the specific properties of star-spots and their migration caused by the differential rotation of the donor would be needed to explain the complex activity of AM Her.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

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Projekt

<a href="/cs/project/GC13-39464J" target="_blank" >GC13-39464J: Digitalizace astronomických fotografických desek a výzkum kosmických zdrojů v digitalizovaných deskových astronomických archivech</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

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Svazek periodika

463

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

1342-1351

Kód UT WoS článku

000388122400019

EID výsledku v databázi Scopus

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