Photometric transformation from RGB Bayer filter system to Johnson-Cousins BVR filter system

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• 作者：Woojin Park^a ; ^{woojinpark@khu.ac.kr" class="auth_mail" title="E-mail the corresponding author} ; Soojong Pak^a ; ^{soojong@khu.ac.kr" class="auth_mail" title="E-mail the corresponding author} ; Hyunjin Shim^b ; Huynh Anh N. Le^a ; Myungshin Im^c ; Seunghyuk Chang^d ; Joonkyu Yu^e
• 关键词：Data analysis ; Photometry transformation ; Johnson&ndash ; Cousins filter system ; Bayer filter system ; Open cluster
• 刊名：Advances in Space Research
• 出版年：2016
• 出版时间：1 January 2016
• 年：2016
• 卷：57
• 期：1
• 页码：509-518
• 全文大小：1506 K

文摘

The RGB   Bayer filter system consists of a mosaic of hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715005694&_mathId=si1.gif&_user=111111111&_pii=S0273117715005694&_rdoc=1&_issn=02731177&md5=9eb118f87958b26169b9e262466c9acc" title="Click to view the MathML source">R,GhContainer hidden">hCode">h altimg="si1.gif" overflow="scroll">R,Gh>, and B filters on the grid of the photo sensors which typical commercial DSLR (Digital Single Lens Reflex) cameras and CCD cameras are equipped with. Lot of unique astronomical data obtained using an RGB Bayer filter system are available, including transient objects, e.g. supernovae, variable stars, and solar system bodies. The utilization of such data in scientific research requires that reliable photometric transformation methods are available between the systems. In this work, we develop a series of equations to convert the observed magnitudes in the RGB   Bayer filter system (hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715005694&_mathId=si52.gif&_user=111111111&_pii=S0273117715005694&_rdoc=1&_issn=02731177&md5=95549073114da2d5cf528148f02a2ca4" title="Click to view the MathML source">R_B,G_BhContainer hidden">hCode">h altimg="si52.gif" overflow="scroll">RB,GBh>, and hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715005694&_mathId=si53.gif&_user=111111111&_pii=S0273117715005694&_rdoc=1&_issn=02731177&md5=ea394f9c11bc63e254b015dea8365c27" title="Click to view the MathML source">B_BhContainer hidden">hCode">h altimg="si53.gif" overflow="scroll">BBh>) into the Johnson–Cousins BVR   filter system (hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715005694&_mathId=si2.gif&_user=111111111&_pii=S0273117715005694&_rdoc=1&_issn=02731177&md5=5e25e544131beba5392a80281e232944" title="Click to view the MathML source">B_J,V_JhContainer hidden">hCode">h altimg="si2.gif" overflow="scroll">BJ,VJh>, and hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715005694&_mathId=si3.gif&_user=111111111&_pii=S0273117715005694&_rdoc=1&_issn=02731177&md5=1239fb92e4c6ab28b6a245a3f8d25200" title="Click to view the MathML source">R_ChContainer hidden">hCode">h altimg="si3.gif" overflow="scroll">RCh>). The new transformation equations derive the calculated magnitudes in the Johnson–Cousins filters (hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715005694&_mathId=si56.gif&_user=111111111&_pii=S0273117715005694&_rdoc=1&_issn=02731177&md5=ae374cf1106b74fda6f451f7706550a4" title="Click to view the MathML source">B_Jcal,V_JcalhContainer hidden">hCode">h altimg="si56.gif" overflow="scroll">Bhvariant="italic">Jcal,Vhvariant="italic">Jcalh>, and hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715005694&_mathId=si57.gif&_user=111111111&_pii=S0273117715005694&_rdoc=1&_issn=02731177&md5=0c6c40cd958b47a6fd30bda2c9bb5410" title="Click to view the MathML source">R_CcalhContainer hidden">hCode">h altimg="si57.gif" overflow="scroll">Rhvariant="italic">Ccalh>) as functions of RGB   magnitudes and colors. The mean differences between the transformed magnitudes and original magnitudes, i.e. the residuals, are hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715005694&_mathId=si58.gif&_user=111111111&_pii=S0273117715005694&_rdoc=1&_issn=02731177&md5=01c3d48c318dbaa65d0848673e046d13" title="Click to view the MathML source">Δ(B_J-B_Jcal)=0.064hContainer hidden">hCode">h altimg="si58.gif" overflow="scroll">hvariant="normal">Δhy="false">(BJ-Bhvariant="italic">Jcalhy="false">)=0.064h> mag, hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715005694&_mathId=si59.gif&_user=111111111&_pii=S0273117715005694&_rdoc=1&_issn=02731177&md5=2b6c58898cc2f36f08866acef08d4d6f" title="Click to view the MathML source">Δ(V_J-V_Jcal)=0.041hContainer hidden">hCode">h altimg="si59.gif" overflow="scroll">hvariant="normal">Δhy="false">(VJ-Vhvariant="italic">Jcalhy="false">)=0.041h> mag, and hmlsrc">hImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0273117715005694&_mathId=si60.gif&_user=111111111&_pii=S0273117715005694&_rdoc=1&_issn=02731177&md5=cdffe2575ccb9debcbb1f1536225d442" title="Click to view the MathML source">Δ(R_C-R_Ccal)=0.039hContainer hidden">hCode">h altimg="si60.gif" overflow="scroll">hvariant="normal">Δhy="false">(RC-Rhvariant="italic">Ccalhy="false">)=0.039h> mag. The calculated Johnson–Cousins magnitudes from the transformation equations show a good linear correlation with the observed Johnson–Cousins magnitudes.