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J Leon WildeBGSUMarch 31st 2005

http://zebu.uoregon.edu/~soper/MilkyWay/cepheid.html. http://www.cartage.org.lb/en/themes/Sciences/Astronomy/Thestars/energyprodu ct/EnergyTransport/EnergyTransport.htm ...

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J Leon WildeBGSUMarch 31st 2005

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    1. J Leon Wilde BGSU March 31st 2005

    Pulsating Variable Stars Welcome

    2. Pulsating Variable Stars Overview

    History of discovery What are pulsating variable stars? Why are they important? Any recent works?

    3. Pulsating Variable Stars History

    1595 – David Fabricius o Ceti, 11 months 1784 – John Goodricke d Cephei, 5d, 8h, 48min ~1912 – Henrietta Leavitt

    4. Pulsating Variable Stars History

    5. Pulsating Variable Stars PVS Physics

    Periodic luminosity changes Radial vs Nonradial Pressure wave estimation:

    9. Pulsating Variable Stars PVS Physics

    10. Pulsating Variable Stars PVS Physics

    Classes:

    11. Pulsating Variable Stars Who cares?

    Very large luminosities Distance calibrations

    12. Pulsating Variable Stars Recent 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

    13. Pulsating Variable Stars Thanks 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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