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

Result code in 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>
Alternative codes found
RIV/68407700:21230/16:00301741
Result on the web
<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>

Result language
angličtina
Original language name
Properties of the long-term optical activity of the prototype polar AM Herculis
Original language description
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.
Czech name
—
Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BN - Astronomy and celestial mechanics, astrophysics
OECD FORD branch
—

Project
<a href="/en/project/GC13-39464J" target="_blank" >GC13-39464J: Digitizing Astronomical Plate Archives and Investigation of Celestial Sources in Digitized Plate Archives</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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