Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21340308w&link_type=abstract
American Astronomical Society, AAS Meeting #213, #403.08; Bulletin of the American Astronomical Society, Vol. 41, p.194
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent observations of mass loss from a fraction of the stars along the RGB in 47 Tuc are at odds with our understanding of single-star mechanisms for mass loss as these kick in only at or above the tip of the RGB. The observations are well fitted by mass loss rates matched to the evolutionary time scale for the stars (dlnM/dt ≈ dlnR/dt), suggesting a negative-feedback mass loss mechanism depending on the red giant radius. One possibility for such a mechanism is the effect of a jovian-mass planet orbiting near the surface of the red giant; if this drives mass loss then negative feedback is likely for sufficiently large planetary compations. The positive feedback maintains a favorable ratio of the orbital size to the stellar radius, allowing the orbit to expand as the radius expands. A prediction of this explanation for red giant mass loss is that there will be a pronounced overabundance of jovian-mass planets near 1AU around post-RGB stars. This work is supported by the National Science Foundation grant NSF-AST 0708143 to LAW.
Marasinghe Kevin
Struck Curtis
Wang Qiangguo
Willson Lee Anne M.
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