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J Leon Wilde BGSU March 31 st 2005

Pulsating Variable Stars Welcome. J Leon Wilde BGSU March 31 st 2005. Pulsating Variable Stars Overview. History of discovery What are pulsating variable stars? Why are they important? Any recent works?. Pulsating Variable Stars History. 1595 – David Fabricius o Ceti, 11 months

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J Leon Wilde BGSU March 31 st 2005

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  1. Pulsating Variable StarsWelcome J Leon Wilde BGSU March 31st 2005

  2. Pulsating Variable StarsOverview • History of discovery • What are pulsating variable stars? • Why are they important? • Any recent works?

  3. Pulsating Variable StarsHistory • 1595 – David Fabricius • o Ceti, 11 months • 1784 – John Goodricke • d Cephei, 5d, 8h, 48min • ~1912 – Henrietta Leavitt

  4. Pulsating Variable StarsHistory

  5. Pulsating Variable StarsPVS Physics • Periodic luminosity changes • Radial vs Nonradial • Pressure wave estimation:

  6. Pulsating Variable StarsPVS Physics

  7. Pulsating Variable StarsPVS Physics • Classes:

  8. Pulsating Variable StarsWho cares? • Very large luminosities • Distance calibrations

  9. Pulsating Variable StarsRecent work? • Polaris! • Period • 1844-2004, increase 4.5s/year • 1963-1966, brief hiatus • Magnitude • Prior to 1963, 0.1mag • After 1966, sharp decline, 0.05mag • Seems to no longer pulsate

  10. Pulsating Variable StarsThanks and references • Thanks! • References: • http://www.adsabs.harvard.edu/ • http://zebu.uoregon.edu/~soper/MilkyWay/cepheid.html • http://www.cartage.org.lb/en/themes/Sciences/Astronomy/Thestars/energyproduct/EnergyTransport/EnergyTransport.htm • http://antwrp.gsfc.nasa.gov/apod/ap981027.html • http://astro.wsu.edu/worthey/astro/html/lec-women.html • http://www.if.ufrgs.br/oei/stars/aglom/clusters.htm • Polaris article: http://www.journals.uchicago.edu/PASP/journal/issues/v117n828/205015/205015.html • Powerpoint presentation available @: http://www.wildealien.com/astro/vst.ppt

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