Radial Velocity Studies of Southern Close Binary Stars.I

Radial-velocity measurements and sine-curve fits to the orbital velocity variations are presented for nine contact binaries, V1464 Aql, V759 Cen, DE Oct, MW Pav, BQ Phe, EL Aqr, SX Crv, VZ Lib, GR Vir; for the first five among these, our observations are t

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aRadialVelocityStudiesofSouthernCloseBinaryStars.I1SlavekM.RucinskiDavidDunlapObservatory,UniversityofTorontoP.O.Box360,RichmondHill,Ontario,CanadaL4C4Y6rucinski@astro.utoronto.caandHilmarDuerbeckWE/OBSS,VrijeUniversiteitBrussel,Pleinlaan2,B-1150Brussels,Belgiumhduerbec@vub.ac.beABSTRACTRadial-velocitymeasurementsandsine-curve tstotheorbitalvelocityvariationsarepresentedforninecontactbinaries,V1464Aql,V759Cen,DEOct,MWPav,BQPhe,ELAqr,SXCrv,VZLib,GRVir;forthe rst veamongthese,ourobservationsarethe rstavailableradialvelocitydata.Amongthreeremainingradialvelocityvariables,CEHyiisaknownvisualbinary,whileCLCetandV1084Scoaresuspectedtobemultiplesystemswherethecontactbinaryisspectrallydominatedbyitscompanion(whichitselfisabinaryinV1084Sco).Fiveadditionalvariables,V872Ara,BDCap,HIP69300,BXInd,V388Pav,areofunknowntype,butmostarepulsatingstars;wegivetheirmeanradialvelocitiesandVsini.Subjectheadings:stars:closebinaries-stars:eclipsingbinaries–stars:variablestars

1.INTRODUCTION

TheoriginsofthispaperarerelatedtothoseoftheseriesofradialvelocitystudiesofshortperiodbinariescurrentlyconductedattheDavidDunlapObservatory(DDOpapers1–10)(Lu&Rucinski1999;Rucinski&Lu1999;Rucinski,Lu,&Mochnacki2000;Luetal.2001;Rucinskietal.2001,2002,2003;Pychetal.2004;Rucinskietal.2005).Bothauthorsrealizedinthe1990’sthatwithavailabilityofgoodHipparcosparallaxes(ESA1997),thelimitingfactoringatheringspatial

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