Detection of possible p-mode oscillations on procyon

Timothy M. Brown, Ronald L. Gilliland, Robert W. Noyes, Lawrence W. Ramsey

Research output: Contribution to journalArticle

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Abstract

In the course of a search for solar-like oscillations in bright late-type stars, we have observed Doppler variability in the F5 subgiant Procyon. The variations have frequencies within a 1.1 mHz range centered at 0.9 mHz, and a total rms amplitude within that range of 2.5 m s-1. Observations of Arcturus and scattered sunlight made with the same equipment during the same time interval show no such variation, indicating that the variations seen on Procyon are of stellar origin. The Doppler signal seen is entirely consistent with solar-like p-modes on Procyon, with maximum mode amplitudes of about 50 cm s-1 and periods around 20 minutes. Several statistical tests support the identification of the signal with narrow-band oscillations, but none does so conclusively. Assuming that the signal does arise from p-modes, there is evidence that the frequency splitting v0 is 71 μHz. We emphasize, however, that the data do not permit a definitive estimate of this quantity, and other values of v0 fit the observations about equally well. In order to clarify the sources of ambiguity in this and similar observations, we describe in detail the data acquisition, reduction, and interpretation.

Original languageEnglish (US)
Pages (from-to)599-609
Number of pages11
JournalAstrophysical Journal
Volume368
Issue number2
DOIs
StatePublished - Feb 20 1991

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oscillation
oscillations
solar oscillations
statistical tests
sunlight
data acquisition
ambiguity
narrowband
intervals
stars
estimates
detection
test

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Brown, T. M., Gilliland, R. L., Noyes, R. W., & Ramsey, L. W. (1991). Detection of possible p-mode oscillations on procyon. Astrophysical Journal, 368(2), 599-609. https://doi.org/10.1086/169725
Brown, Timothy M. ; Gilliland, Ronald L. ; Noyes, Robert W. ; Ramsey, Lawrence W. / Detection of possible p-mode oscillations on procyon. In: Astrophysical Journal. 1991 ; Vol. 368, No. 2. pp. 599-609.
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Brown, TM, Gilliland, RL, Noyes, RW & Ramsey, LW 1991, 'Detection of possible p-mode oscillations on procyon', Astrophysical Journal, vol. 368, no. 2, pp. 599-609. https://doi.org/10.1086/169725

Detection of possible p-mode oscillations on procyon. / Brown, Timothy M.; Gilliland, Ronald L.; Noyes, Robert W.; Ramsey, Lawrence W.

In: Astrophysical Journal, Vol. 368, No. 2, 20.02.1991, p. 599-609.

Research output: Contribution to journalArticle

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Brown TM, Gilliland RL, Noyes RW, Ramsey LW. Detection of possible p-mode oscillations on procyon. Astrophysical Journal. 1991 Feb 20;368(2):599-609. https://doi.org/10.1086/169725