AAS 205th Meeting, 9-13 January 2005
Session 14 Variable Stars and Stellar Oscillations
Poster, Monday, January 10, 2005, 9:20am-6:30pm, Exhibit Hall

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[14.09] Detection of Granulation in Procyon

H. Bruntt (Copenhagen University & US Air Force Academy), D. Buzasi (US Air Force Academy), H. Preston (US Air Force Academy & UNISA), H. Kjeldsen (University of Aarhus)

The WIRE satellite has observed the F-type star Procyon for two periods during 1999 and 2000. The two data sets consist of time series of 10 days length with a cadence of 0.5 seconds and a duty cycle of 15 than the Sun and thus [the photometric signal arising from] granulation is expected to have higher amplitude. We have used the two WIRE data sets to put an upper limit on the granulation and find this to be close to a factor of two times the amplitude seen in the Sun. This limit is lower than the factor [of] five proposed by observations with the Canadian MOST mission (Matthews et al. 2004). Due to the rather low duty cycle in the WIRE data set we are not able to confirm the oscillations seen in Procyon from radial velocity measurements (Martic et al. 2004).

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© 2004. The American Astronomical Society.