Giant Convection Cell Turnover as an Explanation of the Long Secondary Periods in Semiregular Red Variable Stars

Details Giant Convection Cell Turnover as an Explanation of the Long Secondary Periods in Semiregular Red Variable Stars Giant Convection Cell Turnover as an Explanation of the Long Secondary Periods in Semiregular Red Variable Stars

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...725.1170s&link_type=abstract

The Astrophysical Journal, Volume 725, Issue 1, pp. 1170-1174 (2010).

Astronomy and Astrophysics

Astronomy

4

Convection, Stars: Interiors, Stars: Late-Type, Stars: Oscillations, Stars: Variables: General

Scientific paper

Giant convection cells in the envelopes of massive red supergiants turn over in a time comparable in order of magnitude with the observed long secondary periods in these stars, according to a theory proposed some years ago by Stothers & Leung. This idea is developed further here by using improved theoretical data, especially a more accurate convective mixing length and a simple calculation of the expected radial-velocity variations at the stellar surface. The theory is applied to the two best-observed red supergiants, Betelgeuse and Antares, with more success than in the earlier study. The theory can also explain the long secondary periods seen in the low-mass red giants, thus providing a uniform and coherent picture for all of the semiregular red variables. How the turnover of a giant convection cell might account for the observed slow light and radial-velocity variations, their relative phasing, and the absence of these variations in certain stars is discussed here in a qualitative way, but follows naturally from the theory.

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