Is the Evolutionary Outcome of Algol-Type Systems T Leonis Minoris and RW Monocerotis the W UMa Systems?

[摘要] ThevariationsoftheorbitalperiodsoftwoAlgol-typeeclipsingbinaries,TLMiandRWMon,arepresentedthroughadetailedanalysisof$$(O-C)$$diagrams.Itisfoundthat,apartfromaseculardecrease,severalsuddenjumpshaveoccurredintheorbitalperiodsofbothbinarysystems.Theperioddecreaseratewasderivedtobe$$-1.12imes10^{-8}$$d/cycleand$$-$$1.456$$imes$$10$$^{-9}$$d/cycleforTLMiandRWMon,respectively.Suchalargerateisimpossiblyexplainedbyangularmomentumlossandmasslossduetomagneticstellarwinds.Thesuddenjumpsintheorbitalperiodsofbothstarsmightbecausedbyarapidmassexchangebetweenthecircumstellarmatterandbinaries.Atlast,theevolutionarytrendofthetwoAlgol-typesystems,whoseperiodsdecreasedcontinuously,isdiscussed.TheirevolutionaryoutcomemightbeWUMastars.

[学科分类] 天文学(综合)

[关键词] "binaries: eclipsing";"stars: activity";"stars: circumstellar matter";"stars: evolution";"stars: individual (T Leonis Minoris;RW Monocerotis)"