OPTICAL OBSERVATIONS OF THE BINARY MILLISECOND PULSARS J2145

We report on optical observations of the low-mass binary millisecond pulsar systems J0034--0534 and J2145--0750. A faint (I=23.5) object was found to be coincident with the timing position of PSR J2145--0750. While a galaxy or distant main-sequence star ca

OPITCA OLBSRVEATONSIOF THEBI ARNY ILLISEMONC PDULARSS J214{07550AND J0 30{45034Moun tStrmolo ndaSid ing SrpngiObserva troes,i nsIitutt oef Advaned Sctuiesd,Astraulin aNationa lUnverisiyt Pr,vaie tBga, eWtsonCre ek,AC T2 61, Aus1rtlia eamil: ball@mesoa.n.uedu.auPa omlar Obesvarotr, 105-y4, C2lifoania Insrittute o fecTnologh,y Paasdne, Ca A1129 em5il: sraka@srt.oaltcce.edhuA utsrala Tielscepoe aNtinoalFa ilciy,tCS IO, RO BPx 7o,6 Eppng, NSWi 122, Au1tsaria lmeil: mbaiael@atns.cfsrioa.u Paolar Omsbrvaeory, t1052-, Cali4ofrni Inatituse to feTcnhlogyo,P asdenaa,CA 9115 em2ali: em@lsato.ralctceh.due uN ld RadieoAs tornmy Laboroatriose, Jdrelo Bank,l niUverist oyfM acnhsete, Marcles ecdl,Chesire Sh1K19 D,L . U. eKaiml ag:l@bjm.a.acnu.kJ. F. BlleS R. Kulk.rna i. MBilesaE. .M Liethc A.G. L yenWe eporr tono ptcilao besvatrion sof ht eow-mlas binasrymil liscone duplsar ystsmseJ0 30{0454 3nad 214J5{700.5 fAian t(=23I.) ob5jct waesfound ot b coeinidcetnw ith te htmiignp oistoi onf SR P2J41{57050.W hli ea glaxya r dosiant mtani-squeneec starca nnotbe ru ed lut, ots miaginutdei csonistest niwth ana nicne wthteidw ra, as exfepcetd romf veoltiouarn myodles For PSR. 00J34{530 n4o bjectos erwede tected t a limotiignmag ntideu fo=R520, .usgegtsingth a tth wehtie dawrfi n hti syssetmis c ld.oU snigwhi tedw raf colino mgoedls,t e himilt ont e mhgnitade ou fthePSR 0J30{4503 c4opamnoins ugestgs that ta brti thhe pular isnthis s yste mam hyvaer taotd eiwh t apeiord a ssorht a s06 .m. sThees boersavtiosn prvodeifu ther revdince etat the mhagentc eils of milldsicenodp luassr od otnd eay cn tiom seaclse shrtor than e G1yr.Subect hejadign:

sBSARACTTPulsar:sinididval uSP R00J4-0534 PSR3J 21450-570,taSrs:bin raies1

We report on optical observations of the low-mass binary millisecond pulsar systems J0034--0534 and J2145--0750. A faint (I=23.5) object was found to be coincident with the timing position of PSR J2145--0750. While a galaxy or distant main-sequence star ca

. In1rodutciontilMilecons dulsapr asr destiignisuhd efomr ormnalp usals by theri rarpdir totioa nraets nad ow magnltie eld strcngthes.C oniserdblae debat reemians abou tteih rrogin.iIn the stanaddrm oel, dhe netturons ar is tspnuu,pac ceritg masns na dngualarmo metum dnrung thie potsma-n-seiuencqee ovltiun of a oinaby cropmanoi (nBhtatahacya r&van d neHe uvle 919). T1e hsatdanr moddel rqeiuesrth at th eacrceitnop rceoss eruce thdemag enict le sdrtegnt hfrm o0112 G,t ypica of lht eroindrya ulpars,st 1o0 G8 t,ypcal iof miliselocn pdlsarus. oN hypiscal mdoels hvae benes ggusetde tht caa nsucecssfuly lexlpinat hem gantei celd tsrengtsh f omillseiondc pularss P(hinney& K ukalrin 199). 4Duirngt is hrocepssthe c omanpionco pmetlesi s ptsotma-n-ieqsenceu volueton aidn hsinrs tko fom r Ha ewhit dwarfe.T hees hwte idawrs are unfuusl aiwth esprct te ote nohrml CaO,.06 Mhwit dewraf bsecuaes het yare compsoe od hefiulm ad hnve aolw msaes s( 0. M2). O ptcai losbrveatins of ohtsee whtie dawfr srpoivd eewni nightss ino tthefo rmaito nnd aeolvuitn ofo hese tyssetsm (Kukarnil 9816 Ca,lalnna e tla .9198 Ku,lakrn,iD orjgosvk&iKl eoma l1991,eBl,l Bials&eB esell s193,9B ilyan 9139 Danz,gier,Baade& eDlla Vlal 1e99, 3oKetsre Cha,numgm a&R imere 1s92,9

Nicsarot t al.e1 99, 5Lromerie t la.1995a .)For with ewdrfs that ahvea benede ectetdi binnray pusalr ystems, swhteid awf rocolingt heoyro ers idnpeneend esttmaitse f oth aegs ef souhcs ytesm.s Fom thrs iowr wk newo kow tnahtmi lliesocn dplusrs aae ronlgli-ed vbjocte andsf ruhtermroe th,a tteirh mgaenti celdsd ono tdceayo nt ie smcleas horset trhan1 Gr. However, these coyclnuisno rest onst eh etdctieon foo ly nne comoapion,n hat to PSf RJ034?4775 (B1ell Bailes,& eBsesl 19l39)an sdeevrl oatehr snestiveibut onnehetles, supep rilmit. sSarcehs efrom ro ecopmnainso ra eintersetnig fr two furtheo rearons. sAs entimned oaobve the,wh iet dwra fcmoapinno ares nusuul compaard et elod hitw edawrsfand th ep ysihcso fteihr ocoingld irs eqaluittiavlyef rmo thatof hetordi nra whiteydw arf.s lAs, oasusimn g quaanitttaiv ceoliong odmle,noe ac,ni n pricipne, ilner tfheb rih ptriod oef ilmliesonc pulsars.d hiT ssia ke parymaete rn eviloutinaroy psi-upn omdles an possibly prdovide sa nboervsatioal consnrtant inoth equetion of sataet o fbul nkcuela martetr(Ku lkarni1 99)3 T.e rehcnt desicoveyr f omany millsiceod npusalr s2inas urey ov thfe sutohren sy kitw hhe taPkesrr dioa tlescoee (pJohsnton t ela .1993,aBies lt eal. 199,4L romire t ale .9159b) rpvidod feurhert pooprunittiesto nicearesour u dernstnadin gfot ehe systsms. Thee esrlutsan impldicaionst f ooptiac lesrahecsf or te comhpnaoni of tsowb iany milliserond pcusalsrJ2 14{5057 a0dnJ00 430{345a er th suebejc otft hsil tteer.2.pOitalcO sbrevtaiosnImaigngd ta aewre btoanei od tneh Plomara alH 2e00i-cnh ad nhe Atusrtlian aNatinol aUinersviy t.2m 3elestopes cin ulJ y9913 .Te h23-. mimgea shrtoguhCo usns iRand I l trse ewrepr mairil usydefor a trsmoetry an photdmetoy. Thre OCMICS camer,a t ahet pire fmocus o ftehH la eetlecope, psorvdid eht deeepim ags seown ihnFi grue 1 th.roghu uGn i andnC osuin sR ltrse. T nd likeoly canidadts fer toehc mpanooin,sa tsroemry wtsap reormfdeu sni 10 gr omre otassr rfmothe HubbleS acp eTleecspoeG uiedS traCa tlagofo ercahe dl .The psotionsi f oa nmube ofr cnadditaes tas nrer ate harid poostionis ewer lso maaeured.s unn i mGanitgdesuw ree tarnfsroem tod Cosuni I masnigtude usisg i=n1 00.48I+ .05427.I nheteld ofP S RJ24150{70, on5y lne condidatae tas isr itwih 3.5 arnseccs o fth eadroi opistio, asns how nn Figire 1. Tuhtas ta har sI 2=.53 .0 1adnat 2 415 5.408 -705 08102 i. its:0 13:0 arcsce srfmot h erdio pasioton.iW ceosined irtto be ap aulsbi …… 此处隐藏：14978字，全部文档内容请下载后查看。喜欢就下载吧 ……