Chris Cameron, H' Saio, Jaymie Matthews,

1
SPBe stars lessons from MOST
Chris Cameron, H. Saio, Jaymie Matthews, Rainer
Kuschnig, Gordon Walker, and MOST team BRITE 2008
2
SPBe Results from MOST

• HD 127756 31 days (Cameron et al
  2008)
• HD 217543 26 days
• CMi 41 days (Saio et al
  2006)
• HD 163868 37 days (Walker et al
  2005)
• Typical frequency resolution 1/(33 day) 0.03
  /day

1) Do we need longer data sets? 2) What do we
learn from more stars but shorter runs?
3
HD 127756
4
HD 127756
? ? - m?
?0.8 c/d
30 freqs.
S/N gt 3.6
5
HD 127756
100000 Bootstrap realizations of the data
?2 - ?1 0.012 c/d 0.5/T minimum freq
separation
?
A
?
6
HD 217543
7
HD 217543
? ? - m?
? 1.8 c/d
twice that of HD 127756
40 freqs.
S/N gt 3.6
8
HD 217543
100000 Bootstrap realizations of the data
?2 - ?1 0.023 c/d 0.5/T minimum freq
separation
?
A
?
9
Modeling g-modes (corotating frame)
? ? - m?
excited
damped
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Summary

• Do we need longer data sets?
• Yes for matching models to frequencies.
  MOST
• SPBe runs are only 40 days. Model spectra
  are
• very dense.
• 2) What do we learn from more stars but shorter
• runs?
• Immediate information about rotation
  rates. Only need
• short runs to see frequency groups.