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1、AstronomicalDataAnalysisSoftwareandSystemsVIIASPConferenceSeries,Vol.145,1998R.Albrecht,R.N.HookandH.A.Bushouse,eds.SlitlessMultiobjectSpectroscopywithFOSCTypeInstrumentsV.F.PolcaroandR.ViottiIstitutodiAstro sicaSpaziale,CNR,Frascati,ItalyAbstract.Wepre
2、sentasimple,e ectivetechniquethatallowsthecon-temporaryspectroscopyofalltheobjects,uptoalimitingmagnitude,containedina100arcmin2 eld.Thistechniquemakespossibletheimmediateandunambiguousidenti cationofpeculiarobjectsincludedinthe eld.Adataanalysisproced
3、urethatproducesthe nalresultsinaveryshorttimehasalsobeendeveloped.Asatestofthistechnique,wepresenttheresultsobtainedforthepeculiaryoungopenclusterBerkeley87.WeshowthatthistechniqueshouldalsobequiteusefulinemissionlineandWRstarsurveys,andillustratetheso
4、ftwareproceduresdevel-opedtomakethewavelengthandfluxcalibrationofthesespectra.(*)BasedondatacollectedattheLoianoObservatoryModernhardX-raysatellitesallowtherealtimepositioningoftransienthighenergysourceswithaprecisionof100{300.Insomecases,asforthegamma-
5、raybursts,thefastidenti cationoftheopticalcounterpartisacrucialitemtounveilthephysicalnatureoftheemittingobject.Ontheotherhand,nootherwaytomaketheiridenti cationintheopticalrangehasbeensofarfound,butmakingthespectroscopyofalltheobjectsincludedintheerror
6、box,andlookingattheobjectswhichshowapeculiar(e.gemissionline)opticalspectrum.Ofcourse,withinaskyareaoforderofsome102arcmin2,thereisanenormousnumberofobjectsanditisunlikelythatwecanobtainalltheirspectrainareasonabletimeperiod.Thisfactusuallyovercomplicat
7、estheidenti cationoftheopticalcounterpartofthehighenergycosmicsources,attheriskofsubstantiallydiminishingthescienti cpotentialoftheimaginghardX-rayandgamma-raytelescopes.Forthisreason,wehavedevelopedatechnique,thatallowsthesimultaneousspectroscopyofallt
8、heobjectsincludedinasquare eldofviewwith100side,usingthewidelyusedFOSC-typeopticalspectrometerandcamerafocal-planeinstruments.Thetechniqueisbasedontheuseofaslitlesslowdispersiongrismcoupledwithabroad-band lter,whichperformanbjec
