Publication Abstracts
Stothers 2010
, 2010: Giant convection cell turnover as an explanation of the long secondary periods in semiregular red variable stars. Astrophys. J., 725, 1170-1174, doi:10.1088/0004-637X/725/1/1170.
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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BibTeX Citation
@article{st04020v, author={Stothers, R. B.}, title={Giant convection cell turnover as an explanation of the long secondary periods in semiregular red variable stars}, year={2010}, journal={Astrophys. J.}, volume={725}, pages={1170--1174}, doi={10.1088/0004-637X/725/1/1170}, }
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RIS Citation
TY - JOUR ID - st04020v AU - Stothers, R. B. PY - 2010 TI - Giant convection cell turnover as an explanation of the long secondary periods in semiregular red variable stars JA - Astrophys. J. VL - 725 SP - 1170 EP - 1174 DO - 10.1088/0004-637X/725/1/1170 ER -
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