CCD Photometric Study of the Contact Binary TX Cnc in the Young Open Cluster NGC 2632

[摘要] TXCncisamemberoftheyoungopenclusterNGC2632.Inthepresentpaper,fourCCDepochsoflightminimumandacomplete$$V$$lightcurveofTXCncarepresented.AperiodinvestigationbasedonallavailablephotoelectricorCCDdatashowedthatitissuperimposedonalong-termincrease($$dP/dt=+3.97imes{10^{-8}}$$dyr$$^{-1}$$),andweakevidencesuggeststhatitincludesasmall-amplitudeperiodoscillation($$A_3=0lap{.}^{md}0028$$;$$T_3=26.6$$yr).Thelightcurvesinthe$$V$$bandobtainedin2004wereanalyzedwiththe2003versionoftheW-Dcode.ItwasshownthatTXCncisanovercontactbinarysystemwithadegreeofcontactfactor$$f=24.8\%(pm0.9\%)$$.Theabsoluteparametersofthesystemwerecalculated:$$M_1=1.319pm0.007M_{odot},M_2=0.600pm0.01M_{odot}$$;$$R_1=1.28pm0.19R_{odot},R_2=0.91pm0.13R_{odot}$$.TXCncmaybeontheTRO-controlledstageoftheevolutionaryschemeproposedbyQian(2001a,b,2003a),andmaycontainaninvisibletertiarycomponent($$m_3approx0.097M_{odot}$$).Ifthisistrue,thetertiarycomponenthasplayedanimportantroleintheformationandevolutionofTXCncbyremovingangularmomentumfromthecentralsystem(Pribullaamp;Rucinski2006).InthiswaythecontactbinaryconfigurationcanbeformedintheshortlifetimeofayoungopenclusterviaAML.

[学科分类] 天文学(综合)

[关键词] "binaries: close";"binaries: eclipsing";"open cluster: individual (NGC 2632)";"Stars: individual (TX Cnc)";"Stars: evolution"