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Eclipsing Binaries

Eclipsing Binaries. Rohit Chopra Darragh Hettrick Louis Lu Andy Zhang. Binary Stars. 2 stars rotate around each other About a common center of mass Primary and Companion Star Binary systems help us understand characteristics of stars. Types of Binary stars. Eclipsing Binaries.

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Eclipsing Binaries

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  1. Eclipsing Binaries Rohit Chopra Darragh Hettrick Louis Lu Andy Zhang

  2. Binary Stars • 2 stars rotate around each other • About a common center of mass • Primary and Companion Star • Binary systems help us understand characteristics of stars

  3. Types of Binary stars Eclipsing Binaries • Visual Binaries • Spectroscopic Binaries • Astrometric Binaries • Eclipsing Binaries

  4. Eclipsing Binaries • From the Earth’s perspective • One star passes in front another • Often appear as single source of light • Identified with light curves

  5. Light Curve of Eclipsing Binaries • Two dips • Plateau • Eclipse Light Curve of SZ Herculis

  6. Types of Eclipsing Binaries • Detached • Semi-detached • Near Contact • Contact • Over Contact

  7. Why binaries • Help determine the masses of stars • Find out the life of stars • Open up to many discussions

  8. Tabletop experiment Simulated light curves

  9. The setup • Simulates eclipsing binaries physically • Two light bulbs as stars • A light meter as a telescope

  10. 25W vs. 25W • 2 Periods • 12.3cm apart

  11. 95W vs. 25W • 1 Period • 21cm apart

  12. Simulation vs. Actual graphs

  13. Computer Simulation Generated light curves

  14. Key concepts • Stefan-Boltzmann Law • Limb Darkening Effect • Some Geometry

  15. How does the program work • Divides sphere into slices • Only takes light component coming towards us

  16. Instructors • Dr. Raja GuhaThakurta • John Wright • Meredith Muller • ShivaramYellamilli • Raul Ebio

  17. Questions?

  18. Bibliography http://www.space.com/22509-binary-stars.htmlhttp://web.mit.edu/8.01t/www/materials/modules/guide17.pdfhttp://csep10.phys.utk.edu/astr162/lect/binaries/algol.htmlhttp://csep10.phys.utk.edu/astr162/lect/binaries/eclipsing.htmlhttp://en.wikipedia.org/wiki/Binary_starhttp://phet.colorado.edu/sims/my-solar-system/my-solar-system_en.html http://annesastronomynews.com/wp-content/uploads/2012/07/Binary-Star-2-Photo.jpg http://www.as.up.krakow.pl/o-c/diagram_images/her_sz-micro.jpg http://www.richweb.f9.co.uk/astro/images/Her_SZ.20070902.im209062-68.av3x60s.C.an.jpg http://www.daviddarling.info/images/eclipsing_binary.jpg https://www.youtube.com/watch?v=zoekfYomfjI http://ej.iop.org/images/1538-3881/146/4/101/Full/aj482492f5_lr.jpg http://upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Limb_darkening_layers.svg/256px-Limb_darkening_layers.svg.pnghttp://www.wallentinsen.com/binary/Ch1_Introduction.htm http://www.richweb.f9.co.uk/astro/images/Her_SZ.20070902.im209062-68.av3x60s.C.an.jpg http://blog.theabsolutemagnitude.com/binary-stars/ http://i.ytimg.com/vi/hiYW4uqe-gs/0.jpg http://www2.astro.psu.edu/users/dfox/A001/Notes/lec35-doppler.png http://www.ualberta.ca/~pogosyan/teaching/ASTRO_122/lect13/B14_17.gif http://zebu.uoregon.edu/~imamura/121/oct13/cofm.gif

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