The Active Contact Binary FU Draconis: Four Color Light Curves and Period Changes

Liang Liu; Sheng-Bang Qian; Jia-Jia He; Wen-Ping Liao; Li-Ying Zhu; Ergang Zhao

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The Active Contact Binary FU Draconis: Four Color Light Curves and Period Changes

机译：主动接触式二元FU Draconis：四种颜色的光曲线和周期变化

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SecuredfourcolorlightcurvesofFUDrawereanalyzedwiththe2003versionoftheWilsonandDevinney(WD)code.ItwasshownthatFUDraisstillaW-typecontactbinarysystem,butmighthaveahighfill-outfactor($$f$$$$=$$26.7%$$pm$$1.0%).Adarkspotwasintroducedonthemassivecoolcomponent.Aperiodinvestigationbasedonallavailabledatashowsthattheperiodofthesystemmayincludealong-termincrease($$dP/dt$$$$=$$8.8$$pm$$2.9$$ imes$$10$$^{-8}$$dyr$$^{-1}$$)andanoscillation(semi-amplitudeof0.0024d,$$P_3$$$$=$$7.8yr).Thelong-termperioddecreasemaybecausedbymasstransfer,thoughtheperiodicoscillationmayberootedincyclicmagneticactivity.

机译：SecuredfourcolorlightcurvesofFUDrawereanalyzedwiththe2003versionoftheWilsonandDevinney（WD）code.ItwasshownthatFUDraisstillaW-typecontactbinarysystem，butmighthaveahighfill-outfactor（$$˚F$$$$ = $$ 26.7％$$下午$$ 1.0％）。Adarkspotwasintroducedonthemassivecoolcomponent.Aperiodinvestigationbasedonallavailabledatashowsthattheperiodofthesystemmayincludealong-termincrease（$$的dP / dt的$ $ $ $ = $ $ 8.8 $$ pm $$ 2.9 $$ imes $$ 10 $$ ^ {{-8} $$ dyr $$ ^ {-1} $$）和振动（半振幅0.0024d，$$ P_3 $$$$ = $ 7.8yr ）。尽管由于周期性磁振动可能会导致周期性振荡，但可能会因传质而导致长期降低。

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《PASJ: Publications of the Astronomical Society of Japan》 |2012年第3期|共页
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Liang Liu; Sheng-Bang Qian; Jia-Jia He; Wen-Ping Liao; Li-Ying Zhu; Ergang Zhao;
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The Active Contact Binary FU Draconis: Four Color Light Curves and Period Changes

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