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RR Lyraes Bi-Qing For Chris Sneden (UT) George Preston (Carnegie Observatory)
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Transcript of RR Lyraes Bi-Qing For Chris Sneden (UT) George Preston (Carnegie Observatory)
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RR LyraesRR Lyraes
Bi-Qing ForBi-Qing For
Chris Sneden (UT) Chris Sneden (UT)
George Preston (Carnegie Observatory)George Preston (Carnegie Observatory)
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What are RR Lyrae stars?What are RR Lyrae stars?
APOD 23 Feb 2001
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What happens when stars cross What happens when stars cross the instability strip? the instability strip?
They pulsate like a jello!
Scientific Computing in the School of Physics at the University of Sydney
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RR LyraesRR Lyraes
Max radius
Typical time scale = 0.57 day
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Different types of RR LyraesDifferent types of RR Lyraes
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What drives stellar pulsations?What drives stellar pulsations?
• Kappa-mechanism (RR Lyrs)– “steam engine”
Absorb heat
Restore the balance inside the star
Release heat / cool off
Contract Expand
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Why RR Lyraes are interesting? Why RR Lyraes are interesting?
• Most of RR Lyraes have – stable pulsation – stable pulsational period– high luminosity
• Easy to be identified at large distances
• Standard candles for distance scale
• Tracers for Studying Galactic structure
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Distance scale to Globular ClustersDistance scale to Globular Clusters
https://www.cfa.harvard.edu/~jhartman/M3_movies.html
M 3
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Duffau et al. (2006)
Tracers for studying Galactic structureTracers for studying Galactic structure
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Special: Blazhko effectSpecial: Blazhko effect
Sergey Blazhko
created by D. Welch based on MACHO project data, Alcock et al. 2000
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What am I studying?What am I studying?• Chemical compositions throughout the
pulsational cycle.
• Line profile variation
• Where do we get the spectra?
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George Preston
LCO
Du Pont 100 inch
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What do we learn?What do we learn?
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Line profile variationLine profile variation
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Chemical CompositionsChemical Compositions
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Current MissionsCurrent Missions
CoRoT - COnvection, ROtation & Transits planétaires
Kepler Space Telescope
Many new RR Lyrs have been discovered
New properties have been found in the lightcurves of RR Lyrs
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