The discrepant long-term activities of the polars BY Camelopardalis and AR Ursae Majoris
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00618781" target="_blank" >RIV/67985815:_____/25:00618781 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21230/25:00382289
Result on the web
<a href="https://doi.org/10.1016/j.newast.2025.102375" target="_blank" >https://doi.org/10.1016/j.newast.2025.102375</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.newast.2025.102375" target="_blank" >10.1016/j.newast.2025.102375</a>
Alternative languages
Result language
angličtina
Original language name
The discrepant long-term activities of the polars BY Camelopardalis and AR Ursae Majoris
Original language description
Polars are cataclysmic variables with strongly magnetized white dwarfs (WDs). This analysis of the long-term optical activity of two polars (BY Cam and AR UMa) used the light curves of CCD data from the ZTF and CRTS and photographic data from the DASCH databases. These two polars display remarkably discrepant long-term activities. The high-state activity dominated BY Cam, except fora short and shallow low-state episode. A fit to BY Cam's light curve shows long-term brightness changes in the high state. We ascribe the variable profiles of the histograms of the residuals of this fit (1-year bins) to the changes in the dominance of the individual accretion modes and accreting regions on the WD with time (hundreds of days). The high-state episodes (no matter how long and bright) of AR UMa occurred from a relatively stable low-state brightness level. The superorbital changes of AR UMa dominated in the high states. Bursts of mass transfer from the donor are likely to contribute to the short high-state episodes.
Czech name
—
Czech description
—
Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
New Astronomy
ISSN
1384-1076
e-ISSN
1384-1092
Volume of the periodical
118
Issue of the periodical within the volume
Aug.
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
4
Pages from-to
102375
UT code for WoS article
001444213500001
EID of the result in the Scopus database
2-s2.0-85218850732