Searching for p-modes in η Boötis & Procyon using MOST satellite data

Details Searching for p-modes in η Boötis & Procyon using MOST satellite data Searching for p-modes in η Boötis & Procyon using MOST satellite data

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007coast.151....5g&link_type=abstract

Communications in Asteroseismology, Vol.151, p. 5-25

Computer Science

6

Scientific paper

We present frequency analyses of new photometry obtained in 2005 by the MOST (Microvariability & Oscillations of STars) satellite of two solartype stars, η Boötis and Procyon, and reanalyses of MOST data of these stars obtained in 2004. With improved strategies to identify and correct stray light artifacts in the MOST Fabry Imaging data, we produce amplitude spectra from the reduced data and compare them to p-mode oscillation spectra computed from stellar models. We confirm the null result from the 2004 MOST observations of Procyon. We find no evidence for spectral power with regular spaced frequencies characteristic of radial p-modes, nor do we find excess power in the expected p-mode frequency range. Consequently, we argue the absence of p-mode oscillations in Procyon exceeding our detection limit of about 10ppm.6 Searching for p-modes in η Bootis and Procyon using MOST satellite data For η Boo, the frequencies present in the 2005 data do not match within the resolution those identified in the 2004 data after excluding all frequencies we suspect to be due to stray light contamination. However, there is clear evidence for excess power within the p-mode range predicted by models. We discuss the implications of these results for mode lifetimes in these stars and the sensitivity of high-precision photometry to solar-type oscillations in the presence of granulation.

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