ccd observations and preliminary analysis of the “end-of-the-line” w uma eclipsing binary v523...
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![Page 1: CCD Observations and Preliminary Analysis of the “End-of-the-Line” W UMa Eclipsing Binary V523 Cas Presenting Authors: Russell M. Genet, Orion Observatory](https://reader033.vdocument.in/reader033/viewer/2022051116/5697bfda1a28abf838cb0094/html5/thumbnails/1.jpg)
CCD Observations and CCD Observations and Preliminary Analysis of thePreliminary Analysis of the “End-of-the-Line” W UMa “End-of-the-Line” W UMa Eclipsing Binary V523 CasEclipsing Binary V523 Cas
Presenting Authors:Presenting Authors:Russell M. Genet, Orion ObservatoryRussell M. Genet, Orion ObservatoryThomas C. Smith, Dark Ridge ObservatoryThomas C. Smith, Dark Ridge Observatory
Contributing Authors:Dirk Terrell, Southwest Research InstituteLaurance Doyle, SETI Institute
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Program OverviewProgram Overview
• First year “pilot”• Concentrated on two W UMa binaries
• Complete light curves every night
• Often from two observatories
• Primary science goal• Study changes in light curve shapes
• Secondary science goals• Precise seasonal ephemeredes
• Consider hot “Jupiter” transits
• Technical goals• Develop analytical tools
• Explore photometric precision
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Presentation OutlinePresentation Outline
• Introduction to W UMa Binaries
• Observations and Reduction
• V523 Cas Preliminary Analysis
• V523 Cas “Movie”
• Question & Answers
Russ
Tom
Russ
Tom
All
![Page 4: CCD Observations and Preliminary Analysis of the “End-of-the-Line” W UMa Eclipsing Binary V523 Cas Presenting Authors: Russell M. Genet, Orion Observatory](https://reader033.vdocument.in/reader033/viewer/2022051116/5697bfda1a28abf838cb0094/html5/thumbnails/4.jpg)
Presentation OutlinePresentation Outline
• Introduction to W UMa Binaries
• Observations and Reduction
• V523 Cas Preliminary Analysis
• V523 Cas “Movie”
• Question & Answers
Russ
Tom
Russ
Tom
All
![Page 5: CCD Observations and Preliminary Analysis of the “End-of-the-Line” W UMa Eclipsing Binary V523 Cas Presenting Authors: Russell M. Genet, Orion Observatory](https://reader033.vdocument.in/reader033/viewer/2022051116/5697bfda1a28abf838cb0094/html5/thumbnails/5.jpg)
• Photometric / Magnetic Variability
• Intrinsic Period Changes
• Third – Body Period Changes
• Planetary Transits
Introduction to W UMa BinariesIntroduction to W UMa Binaries
![Page 6: CCD Observations and Preliminary Analysis of the “End-of-the-Line” W UMa Eclipsing Binary V523 Cas Presenting Authors: Russell M. Genet, Orion Observatory](https://reader033.vdocument.in/reader033/viewer/2022051116/5697bfda1a28abf838cb0094/html5/thumbnails/6.jpg)
• Photometric / Magnetic Variability
• Intrinsic Period Changes
• Third – Body Period Changes
• Planetary Transits
Introduction to W UMa BinariesIntroduction to W UMa Binaries
![Page 7: CCD Observations and Preliminary Analysis of the “End-of-the-Line” W UMa Eclipsing Binary V523 Cas Presenting Authors: Russell M. Genet, Orion Observatory](https://reader033.vdocument.in/reader033/viewer/2022051116/5697bfda1a28abf838cb0094/html5/thumbnails/7.jpg)
W UMa’s BinariesW UMa’s Binaries
• Over contact
• Dissimilar stars
Common envelope
Yet nearly same temperature
• Very Different masses
• Huge transfer of energy
Large to small
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Color – Period RelationshipColor – Period Relationship
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Color – Period RelationshipColor – Period Relationship
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A W
More evolved
Higher masses
Thicker envelopes
Unevolved
Lower masses
Cannot achieve equilibrium
Period changes
Light curve variabilityBrighter star
Dimmer star
A and W Type W-UMa Binaries
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W Type W UMa VariabilityW Type W UMa Variability
• Large Rosby number Fast rotators
Long convection turnover times
• For single stars Late Slow rotator
• For W UMa Late Fast rotator
• Ideal “laboratories” for magnetic activity
• Revealed through changing light curves
• “Movies” instead of disjointed snapshots
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Bright Northern Short Period W UMa’sBright Northern Short Period W UMa’s
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• Photometric / Magnetic Variability
• Intrinsic Period Changes
• Third – Body Period Changes
• Planetary Transits
Introduction to W UMa BinariesIntroduction to W UMa Binaries
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Intrinsic Period ChangesIntrinsic Period Changes
• Angular Momentum Loss• Gravitational radiation
• Mass loss
• Magnetic breaking
• Mass transfer between stars
• Applegate effect
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• Photometric / Magnetic Variability
• Intrinsic Period Changes
• Third – Body Period Changes
• Planetary Transits
Introduction to W UMa BinariesIntroduction to W UMa Binaries
![Page 16: CCD Observations and Preliminary Analysis of the “End-of-the-Line” W UMa Eclipsing Binary V523 Cas Presenting Authors: Russell M. Genet, Orion Observatory](https://reader033.vdocument.in/reader033/viewer/2022051116/5697bfda1a28abf838cb0094/html5/thumbnails/16.jpg)
SETI Visit with Laurance DoyleSETI Visit with Laurance Doyle
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BarycentersBarycenters
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V523 Cas Long-Term O-CV523 Cas Long-Term O-C
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CM Dra ProgramCM Dra Program
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• Photometric / Magnetic Variability
• Intrinsic Period Changes
• Third – Body Period Changes
• Planetary Transits
Introduction to W UMa BinariesIntroduction to W UMa Binaries
![Page 21: CCD Observations and Preliminary Analysis of the “End-of-the-Line” W UMa Eclipsing Binary V523 Cas Presenting Authors: Russell M. Genet, Orion Observatory](https://reader033.vdocument.in/reader033/viewer/2022051116/5697bfda1a28abf838cb0094/html5/thumbnails/21.jpg)
Transit PerspectiveTransit Perspective
II
I
Inclination Angle
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High Inclination W UMa StarsHigh Inclination W UMa Stars
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Solar Radii vs. Line-of-Sight Solar Radii vs. Line-of-Sight Inclination AngleInclination Angle
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Three Transit PlotsThree Transit Plots
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Presentation OutlinePresentation Outline
• Introduction to W UMa Binaries
• Observations and Reduction
• V523 Cas Preliminary Analysis
• V523 Cas “Movie”
• Question & Answers
Russ
Tom
Russ
Tom
All
![Page 26: CCD Observations and Preliminary Analysis of the “End-of-the-Line” W UMa Eclipsing Binary V523 Cas Presenting Authors: Russell M. Genet, Orion Observatory](https://reader033.vdocument.in/reader033/viewer/2022051116/5697bfda1a28abf838cb0094/html5/thumbnails/26.jpg)
Dark Ridge Observatory (DRO)Dark Ridge Observatory (DRO)
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Orion Observatory (OO)Orion Observatory (OO)
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Image Reduction FlowchartImage Reduction Flowchart
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DRO/OO Observational Database 2004DRO/OO Observational Database 2004
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Light-Curve DatabaseLight-Curve Database
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Raw Text File to Raw Excel 25KSub buildPhase() ' use the getPhase function to populate the phase field Dim myDb As Database Dim myRs As Recordset Set myDb = CurrentDb() Set myRs = myDb.OpenRecordset("Select * from tblLightCurve", dbOpenDynaset) Do While Not myRs.EOF myRs.Edit myRs.Fields("Phase").Value = getPhase(myRs.Fields("HJD").Value).phase myRs.Fields("Cycle").Value = getPhase(myRs.Fields("HJD").Value).Cycle myRs.Update myRs.MoveNext Loop MsgBox "Done"End SubSub buildAdjustedPhase() ' use the getPhase function to populate the phase field Dim myDb As Database
1 2
3Raw Source
Database
1a
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Presentation OutlinePresentation Outline
• Introduction to W UMa Binaries
• Observations and Reduction
• V523 Cas Preliminary Analysis
• V523 Cas “Movie”
• Question & Answers
Russ
Tom
Russ
Tom
All
![Page 33: CCD Observations and Preliminary Analysis of the “End-of-the-Line” W UMa Eclipsing Binary V523 Cas Presenting Authors: Russell M. Genet, Orion Observatory](https://reader033.vdocument.in/reader033/viewer/2022051116/5697bfda1a28abf838cb0094/html5/thumbnails/33.jpg)
V523 Cas Preliminary Analysis
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Analysis ConsiderationsAnalysis Considerations
• Specialized analysis
• Complete light curves only
• Many complete curves
• Multiple observatories
• Preliminary
• Analysis not completed
• No ensemble photometry yet
• Automation
• Not just labor efficiency
• Parametric outer loop
• In conjunction with WD (Terrell)
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Edits and Adjustments
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25K Database 24,761
Bad Weather -3,232
C&K Zeros -54
3-Sigma Cuts -173
V-C Outliers -54
21K Database 21,248
Edits and Adjustments
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Beginning and Ending Database RowsBeginning and Ending Database Rows
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Typical DRO 21K Database Light CurveTypical DRO 21K Database Light Curve
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Typical OO 21K Database Light CurveTypical OO 21K Database Light Curve
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Classical Analysis
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Robert Nelson’s Minima23Robert Nelson’s Minima23
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V523 Cas Seasonal O-CV523 Cas Seasonal O-C
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Phase-Binned Analysis
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Eclipsing Binary PhasesEclipsing Binary Phases
0.00 0.25 0.50 0.000.75 0.25
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HJD to Phase TransformationHJD to Phase Transformation
Epoch – JD Obs
Period{ }=Φ
Epoch = 2453234.63551606
Period = 0.23369537
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21K Data Point Phase Plot V523 Cas21K Data Point Phase Plot V523 Cas
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Phase BinningPhase Binning
Epoch – JD Obs
Period{ }=Φ
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Phase – Binned Analysis IPhase – Binned Analysis I
...
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Phase – Binned Analysis IIPhase – Binned Analysis II
...
DifferenceEngine
...
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V523 Cas 2004 Season Master Curve V523 Cas 2004 Season Master Curve Utilizing the Binning MethodUtilizing the Binning Method
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Symmetry Analysis
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Symmetry AlgorithmSymmetry Algorithm
… …
Y2 = Y1 + (X2 – X1)(Y3 – Y1)
(X3 – X1)
ΣN
S=1
(Y2L – Y2R)=
... ……
N 13 2 N1 2 3
X1 X1X2 X3 X2 X3
Left Right
Y1
Y3
Y2
Y1
Y3
Y2
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Total PhaseTotal Phase
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Secondary Minima NarrowSecondary Minima Narrow
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First Maxima NarrowFirst Maxima Narrow
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Presentation OutlinePresentation Outline
• Introduction to W UMa Binaries
• Observations and Reduction
• V523 Cas Preliminary Analysis
• V523 Cas “Movie”
• Question & Answers
Russ
Tom
Russ
Tom
All
![Page 57: CCD Observations and Preliminary Analysis of the “End-of-the-Line” W UMa Eclipsing Binary V523 Cas Presenting Authors: Russell M. Genet, Orion Observatory](https://reader033.vdocument.in/reader033/viewer/2022051116/5697bfda1a28abf838cb0094/html5/thumbnails/57.jpg)
Making the MovieMaking the Movie
• 35 pictures were created from the binned, zero-shifted V-C plots.
• The pictures have been arranged in chronological order to represent the nightly results and to show the night-to-night changes in the shapes of the light curves as compared to the master season curve created from all 21K observations.
• The following 35 frames represent a visual depiction of those changes in a somewhat dynamic show.
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V523 Cas 2004 Seasonal Movie V523 Cas 2004 Seasonal Movie of Binned Difference Plotsof Binned Difference Plots
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V523 Cas 2004 Seasonal Movie V523 Cas 2004 Seasonal Movie of Binned Difference Plotsof Binned Difference Plots Frame 1
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V523 Cas 2004 Seasonal Movie V523 Cas 2004 Seasonal Movie of Binned Difference Plotsof Binned Difference Plots Frame 2
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V523 Cas 2004 Seasonal Movie V523 Cas 2004 Seasonal Movie of Binned Difference Plotsof Binned Difference Plots Frame 3
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Preliminary ConclusionsPreliminary Conclusions
• Changes in light curve shapes• Definite changes September to December
• Possible changes within August and September
• Small O-C variations• Difficult to detect within season
• But likely between seasons
• May detect distant “Jupiters” (over several years)
• Transits• Several W UMa candidates
• Detection difficult due to changing times of transit / spots
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Potential Future EffortsPotential Future Efforts
Dirk Terrell,
Darth’s other side!
The Master Modeler…
• Photometric precision
• Parametric analysis / automation
• Data archives to AAVSO
• Give V1191 Cyg THE treatment
• Between season comparisions
• Wilson – Devinney Analysis
With his extensive Galactic travels we asked the expert for his assistance with the WD analysis.
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Questions & AnswersQuestions & Answers
Genet / Smith V523 Cas 2004 Seasonal Report