The amplitude of solar oscillations using stellar techniques

Details The amplitude of solar oscillations using stellar techniques The amplitude of solar oscillations using stellar techniques

2008-04-08

arxiv.org/abs/0804.1182v3

Astronomy and Astrophysics

Astrophysics

8 pages, accepted by ApJ. Minor wording changes and added a reference

Scientific paper

10.1086/589142

The amplitudes of solar-like oscillations depend on the excitation and damping, both of which are controlled by convection. Comparing observations with theory should therefore improve our understanding of the underlying physics. However, theoretical models invariably compute oscillation amplitudes relative to the Sun, and it is therefore vital to have a good calibration of the solar amplitude using stellar techniques. We have used daytime spectra of the Sun, obtained with HARPS and UCLES, to measure the solar oscillations and made a detailed comparison with observations using the BiSON helioseismology instrument. We find that the mean solar amplitude measured using stellar techniques, averaged over one full solar cycle, is 18.7 +/- 0.7 cm/s for the strongest radial modes (l=0) and 25.2 +/- 0.9 cm/s for l=1. In addition, we use simulations to establish an equation that estimates the uncertainty of amplitude measurements that are made of other stars, given that the mode lifetime is known. Finally, we also give amplitudes of solar-like oscillations for three stars that we measured from a series of short observations with HARPS (gamma Ser, beta Aql and alpha For), together with revised amplitudes for five other stars for which we have previously published results (alpha Cen A, alpha Cen B, beta Hyi, nu Ind and delta Pav).

Affiliated with

Also associated with

No associations

Rating

The amplitude of solar oscillations using stellar techniques does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The amplitude of solar oscillations using stellar techniques, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The amplitude of solar oscillations using stellar techniques will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-539962