The SolarStellar Connection at HAO

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The Solar-Stellar Connection at HAO
Travis Metcalfe
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Kepler mission solar-type stars

• Single field for 4-6 years, 100,000 stars 30
  minute sampling, 512 at 1 minute
• Latitudinal differential rotation profiles from
  detailed spot modeling
• KASC Metcalfe (s.c.), Creevey (grad), Judge,
  MacGregor, Rast (CU)

Walker et al. (2007)
Ca HK period
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Asteroseismology stellar interiors

• Base of the convection zone creates oscillatory
  signal (5 months CoRoT)
• Mode lifetimes tell us about driving damping
  mechanisms (convection)
• Limited mode set allows low-resolution inversions
  of inner 30 of radius

Baglin et al. (2006)
Bedding et al. (2005)
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SCF models differential rotation

• Recent interferometric observations provide new
  details on rapid rotation
• Solid-body models fail to reproduce the observed
  gravity darkening
• SCF models MacGregor, Jackson, Skumanich, et al.
  (differential rotation)

Monnier et al. (2007)
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SONG network stars planets

• Global network of small telescopes, dedicated to
  seismology exoplanets
• Design and development of prototype in Denmark,
  instrument help at HAO
• SONG Knölker (steering committee), Metcalfe
  (instrument scientist)

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SMARTS survey activity cycles

• Small telescopes at CTIO now run by a consortium
  HAO is a minor partner
• Establishing a southern counterpart to the Mount
  Wilson Ca HK survey
• SMARTS Metcalfe (PI), Judge, Knölker, Rempel,
  Henry, Soderblom, Basu

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Connections
Kepler
interferometry
diff. rotation
SONG
SMARTS
SCF
activity cycles
asteroseismology