star 'Jets' related to Coronae via Magnetic Braking?

[Widdekind]

Star rotation rates, and (dynamo-driven) magnetic field strengths -- which are themselves mutually co-related -- decline with star age (Landstreet 2007). Mass-loss, from outflows correlated with the initially rapid rotation & strong fields, can account for such "braking" (Nariai 1969). Qualitatively, similar is seen, in the "spin down" of Pulsars, due to the emission of EM energy, causing "magnetic braking". Thus, could there be a connection, if crude, between (1) stellar coronae, which generate stellar winds & "astro-sphere nebulae"; (2) Pulsar Wind Nebulae; (3) magnetic braking & star spin-down ? To wit, could stellar coronae be so anomalously hot, b/c they absorb the emitted EM energy, from the central star's spinning magnetic field ?

 

Moreover, astrophysical jets, from NS & BH, in accreting "LMXB" binary systems, form only in the relativistic-stars' "low-hard" state, of (A) low mass accretion rate; and (B) hard X-ray spectra, associated with energized, "up-scattered" (inverse Compton) photons, arising from the ~1-10 keV accretion disk, propagating through, and emerging from, an ultra-hot ~100-300 keV "Accretion Disk Corona" (ADC). (For, at higher accretion rates, and higher disk luminosities, all the extra photons actually cool the ADC down, to a common, and much reduced, AD-ADC temperature.) Note, that such ultra-hot ADC temperatures, where-with-in electron thermal energies are comparable to their rest-mass-energies, are characterized by electrons having trans-luminal velocities. And, the ADC is ~100x larger, than the central NS, thus extending out to where NS-anchored field lines would be "whipping around" at the speed-of-light, i.e., the "light cylinder".

 

Thus, could there be a connection, between star magnetic fields, perhaps powering hot coronae, which then drive star outflows (winds, jets), which inflate circum-stellar nebulae (astro-spheres, Pulsar Wind Nebulae), but which bring about the magnetic braking & spin-down of said central star ?? (Indeed, our own sun has, at rotational mid-plane, an ionized "current sheet", separating polar regions of open, poloidal field lines -- resembling, qualitatively, an "ultra-diffuse accretion disk".)

 

 

 

REFERENCES:

 

Fabrika. Jets & Super-Critical Accretion Disk in SS433.

Kolb. [Open University] Extreme Environment Astrophysics.