Plus You Can Do Some Fun Things With The Data & Images, A Few

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Presentation transcript:

Variable Star Observing Lets You Make Valuable Scientific Contributions Plus You Can Do Some Fun Things With The Data & Images, A Few Examples: Light Curves Super Nova Compute Temperature Compute Spin Periods

Light Curve: Mira Class Star A Pulsating Variable: RR Boo Light Curves Are Made From Multiple Individual Observations! Approximately 300 Days Shown

Light Curve: Eclipsing Dwarf Nova - Single Observer ~ 4 Hours Data Two Complete Eclipses Shown

Light Curve: Dwarf Nova Outbursts - Multiple Observers Approximately 200 Days Shown SS CYG Most Observed Star In The AAVSO Data Base ~ 500,000 Observations over 100 Years

Supernova Are A Blast Many Supernova Occur Within Galaxies Therefore, Good “Photo OP”

Compute Temperature Example Black Dots: = V Filter Blue Dots = B Filter Red Dots = R Filter Purple Dots = I Filter Average B-V (Filters) Difference = .616 Tu Cas: Cepheid Variable (Yellow Giant Star) V Filter B Filter

With a “B-V” of .616 Temperature Range: 5700-6000 K Star is Most Likely a G1 or G2 Spectral Type & is Actually Classified As a “Yellow Giant” Temperature Range: 5700-6000 K

3.6 Hour Light Curve Of DW Cnc DW Cnc Is An Intermediate Polar CV Consisting Of A White Dwarf & A Cool Companion & We Can Analyze The Data Below For Additional Information Tim Crawford 1/29/07 Peranso Software

Example Of Computing The Spin Period Of The White Dwarf Portion Of The DW Cnc System Using The Previous Slides Light Curve Data & Software That Can Analyze That Data Using What is Called the CLEANest Method P = .0268 Day = 38.6 Minutes Peranso Software

Arch Cape Presentation Observatory tcarchcape@yahoo.com Oregon Tim R Crawford - CTX tcarchcape@yahoo.com

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