Evidence for global pressure oscillations in Procyon and Alpha Centauri

Details Evidence for global pressure oscillations in Procyon and Alpha Centauri Evidence for global pressure oscillations in Procyon and Alpha Centauri

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...164..383g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 164, no. 2, Aug. 1986, p. 383-394.

Astronomy and Astrophysics

Astrophysics

63

Helioseismology, Pressure Oscillations, Stellar Oscillations, Stellar Structure, Centaurus Constellation, Early Stars, Main Sequence Stars, Spectrophotometry

Scientific paper

Helioseismology has proved to be a powerful tool to probe the internal structure of the sun. With a new adapted optical-resonance spectrophotometer, an extension has been attempted to two bright stars, namely Alpha Cen A and Procyon. Results obtained from two observing runs on Alpha Cen A in May 1983 and May 1984 at La Silla, and one observing run on Procyon in February 1984 at Hawaii are presented. In both cases, solarlike pressure oscillations have been detected. The complete analysis determines essentially five parameters: the frequency range, the amplitudes, the mean equidistance, the departure around this equidistance (curvature of the echelle-diagram), and the fine frequency spacing between modes of degree 0 and 2. For Procyon, all results are consistent with theoretical predictions, including excitation of oscillations, mass, radius, and age of the star. For Alpha Cen, all the results are consistent together and are confirmed by the 1984 observations. They suggest that Alpha Cen A might be younger than estimated, which is consistent with a ZAMS star.

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