Query : 2007A&A...464.1059L

2007A&A...464.1059L - Astronomy and Astrophysics, volume 464, 1059-1067 (2007/3-4)

Seismology of Procyon A: determination of mode frequencies, amplitudes, lifetimes, and granulation noise.


Abstract (from CDS):

The F5 IV-V star Procyon A (α-CMi) was observed in January 2001 by means of the high-resolution spectrograph SARG operating with the TNG 3.5m Italian telescope (Telescopio Nazionale Galileo) in the Canary Islands, exploiting the iodine cell technique. The time series of about 950 spectra carried out during 6 observation nights and a preliminary data analysis (Claudi et al., 2005A&A...429L..17C) showed a significant power excess between 0.5 and 1.5mHz, with ≃1m/s peak amplitude. Here we present a more detailed analysis of the time series, based on both radial velocity and line equivalent width analyses. From the power spectrum we found a typical p-mode frequency comb-like structure, identified 11 frequencies with a good margin of certainty in the interval 500-1400µHz of modes with l=0,1,2 and 7≤n≤22, and determined large and small frequency separations, Δν= 55.90±0.08µHz and δν02=7.1±1.3µHz, respectively. The mean amplitude per mode (l=0,1) at peak power is 0.45±0.07m/s, twice larger than the solar one, and the mode lifetime is 2±0.4d, which indicates a non-coherent, stochastic source of mode excitation. Line equivalent width measurements do not show a significant excess in power in the examined spectral region but allowed us to infer an upper limit to the granulation noise.

Abstract Copyright:

Journal keyword(s): stars: oscillations - stars: individual: Procyon A - techniques: spectroscopic - techniques: radial velocities

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1836 0
2 * eta Boo SB* 13 54 41.07892 +18 23 51.7946 3.440 3.250 2.680 2.24 1.95 G0IV 685 1
3 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1231 0

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