The discrepant long-term activities of the polars BY Camelopardalis and AR Ursae Majoris

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/68407700:21230/25:00382289

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

The discrepant long-term activities of the polars BY Camelopardalis and AR Ursae Majoris

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

The discrepant long-term activities of the polars BY Camelopardalis and AR Ursae Majoris

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

New Astronomy

ISSN

1384-1076

e-ISSN

1384-1092

Svazek periodika

118

Číslo periodika v rámci svazku

Aug.

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

4

Strana od-do

102375

Kód UT WoS článku

001444213500001

EID výsledku v databázi Scopus

2-s2.0-85218850732