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arXiv:astro-ph/0504469 (astro-ph)
[Submitted on 21 Apr 2005 (v1), last revised 25 Apr 2005 (this version, v2)]

Title:Evidence for Granulation and Oscillations in Procyon from Photometry with the WIRE satellite

Authors:H. Bruntt, H. Kjeldsen, D. L. Buzasi, T. R. Bedding
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Abstract: We report evidence for the granulation signal in the star Procyon A, based on two photometric time series from the star tracker on the WIRE satellite. The power spectra show evidence of excess power around 1 milliHz, consistent with the detection of p-modes reported from radial velocity measurements. We see a significant increase in the noise level below 3 milliHz, which we interpret as the granulation signal. We have made a large set of numerical simulations to constrain the amplitude and timescale of the granulation signal and the amplitude of the oscillations. We find that the timescale for granulation is T(gran) = 750(200) s, the granulation amplitude is 1.8(0.3) times solar, and the amplitude of the p-modes is 8(3) ppm. We found the distribution of peak heights in the observed power spectra to be consistent with that expected from p-mode oscillations. However, the quality of the data is not sufficient to measure the large separation or detect a comb-like structure, as seen in the p-modes of the Sun. Comparison with the recent negative result from the MOST satellite reveal that the MOST data must have an additional noise source that prevented the detection of oscillations.
Comments: 23 pages, 12 figures, submitted to ApJ; v2 revisions: one reference corrected and a comment in Figure 7 corrected
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0504469
  (or arXiv:astro-ph/0504469v2 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0504469
Journal reference: Astrophys.J. 633 (2005) 440-446
Related DOI: https://doi.org/10.1086/462401

Submission history

From: Hans Bruntt [view email]
[v1] Thu, 21 Apr 2005 13:54:58 UTC (506 KB)
[v2] Mon, 25 Apr 2005 08:24:04 UTC (506 KB)
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