AstrophysicsResearchProjectsforNSFIRESMay-July-

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1、AstrophysicsResearchProjectsforNSFIRESMay-July-August2008ShashiM.Kanbur(SUNYOswego)AntonioKanaan(UFSC)CepheidVariablesLinearrelationbetweenlogPandM(inanumberofdifferentbands).Isthisrelationnon-linear:atleastintheLMCopticalwavebands,datasuggeststhatitis.

2、Modeling,lookatotherwavelengths,apply/developnewstatisticaltests.Lookatdatafromothergalaxies.ReducenewsetofIRdata.Usehttp://xxx.lanl.govUsehttp://adsabs.harvard.edu/abstract_service.htmlApplicationofnewStatisticalMethodsKanbur,Ngeow,NanthakumarandSteven

3、s(2007)developedthetestimatorandSchwarzInformationCriterionmethodstoLMCOGLEdata.CodethisupandapplyittoSMCOGLEdata/DIRECTM31/M33dataplusanyotherCepheiddatasetsthatyoucanfind.NgeowandKanbur(2008)developedamid-infraredPLrelation.NanthakumarandKanbur(2009)d

4、evelopedanadaptationofthetestimatortocheckforchangingdispersionasafunctionofperiod–applythistotheSpitzerdataplusatotherwavelengths.Developtheuseofcubicsplinestoanalyzevariablestarlightcurves–startofwithanM31RRLyraedataset.ApplythemethodsofKoenKanburandN

5、geow(2007)tootherdatasetsegtheOGLESMCdata.Thisinvolvesusingthestatspackage“R”inaLinuxenvironment.Thepapersmentionedaboveareatwww.oswego.edu/~kanbur/research.htmlCepheidIRdatareductionBecomefamiliarwithIRdatareductionandphotometryasoutlinedindocumentsgen

6、eratedbyFrankRipple/TravisRooker/DanCrain.Trytoautomatethis–inPythonandseehowthesemethodsmaychangefortheoptical.ConstructCMDdiagramsandlookfortheTRGBusinganumberofstatisticalmethods–codethisup–lookatMakarov,D.,etal2006.CepheidIRPCAWorkonCepheidIRPCAanal

7、ysis.Checkworkthoroughly.Otherdatasets?CanthisbeusedtogenerateCepheidlightcurvetemplatesintheIR?FitpolynomialstoPCAprogressionswithperiod–comparewithTanviretal2005.Finishofthispaper.RRLyraesLookatM31RRLyraes–whichisbetterFourier/cubicsplines/PCA?Constru

8、ctPC/ACrelationsasafunctionofphaseforM31RRLyraes:fitlines/polynomialstoobservedprogressions–comparewithotherdata?RelatemetallicitytoGalacticRRLyraesusingPCA:IhaveGalacticRRLyraedataforwhichthemetallicityandwellobservedlightcurves