The Orbital Period of the SU Ursae Majoris Star EK Trianguli Australis and Evidence for Ring-Like Accretion Disks in Long-Supercycle Length SU Ursae Majoris Stars

Publications of the Astronomical Society of Japan

Arenas, Jose¹  Mennickent, Ronald E.¹ 

[1] Departmento de Física, Facultad de Ciencias, Físicas y Matemáticas, Universidad de Concepción, Casilla 4009, Concepción, Chile E-mail(RM):

关键词: Accretion;    Evolution;    "Stars: cataclysmic";    "Stars: dwarf novae";    "Stars: variable";    "Stars: individual (WX Ceti;    AK Cncri;    AQ Eridani;    RZ Leonis;    TU Mensae;    EK Trianguli Australis;    CU Velorum;    WZ Sagittae)";   

DOI  :  10.1093/pasj/50.3.333

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Anorbitalperiodof0.06288(5)dhasbeenfoundfromaradialvelocitystudyoftheHαemissionline.Inaddition,wehavedetectedanextralineemittingsourcelocated≈80°apartfromthevectorjoiningthesecondary–primarycenters,asmeasuredintheoppositesensetothebinaryrotationalmotion.Thisisnottheexpectedlocationforthehotspotindwarfnovae.Thisanomalycouldberemovedbyassumingalineemissionlaggingbehindthewhitedwarfbinarymotion.Inaddition,wehaveestimatedlineemissivity(∝r−α)anddiskradius$$Requivr_{in}/r_{out}$$for8SUUMastars.Moststarsfitα=1.8±0.1butAKCncandWZSgestronglydeviatefromthemean;theiremissionlineshapescanbeexplainedassumingapost-outburstaccretiondiskmostlyemittingclosetothewhitedwarf(AKCnc)andaring-likedisk(WZSge).Inaddition,wehavefoundatendencyoflong-supercyclelengthSUUMastarstoshowverycompact(largeR;probablyring-like)accretiondisks.Ifthesupercyclelengthwerebasicallycontrolledbythemasstransferrate(Ṁ),theinnerdiskradiuswouldbeafunctionofṀ.Awhitedwarfmagneticfield∼5000GisrequiredtofitthetruncationradiuswiththemagnetosphereradiusofSUUMastars.

【 授权许可】

Unknown