Magnetic Bubbles and Extramixing in Stars

Abstract

Abstract. The possible role of magnetic flux tubes in transporting matter from near the H shell through the radiative zone and into the convective envelope is explored. It is shown that the required rates of mass transport necessary to provide nuclear processed material to the envelope can be achieved if large magnetic fields are present just above the H shell in AGB and RGB stars. The required fields in this zone reach 5 MG for the AGB case and 0.5-0.05 MG for the RGB case. It may thus be possible that magnetic bouyancy play a major role in providing the extra mixing needed for these stars.

Asymptotic Giant Branch Stars and presolar grains

“…Among other amazing findings, they led to the realization that the n-deficient isotope of Al, 26 Al, had been present in the ESS in a huge and uniform concentration ( 26 Al/ 27 Al 5 • 10 −5 ), sufficient to affect significantly, or even control, the heating of ancient materials, which induced the early differentiation of planetary embryos [5,6]. The presence in the ESS of live radioactive isotopes from various stellar sources (whose decay products, signalling their earlier existence, are often called fossil radioactivities) was since then the object of intense research [7][8][9][10].…”