this is for holding javascript data
Matteo Cantiello edited We_quantify_the_mass_dependence__.tex
over 8 years ago
Commit id: 985a5c258b0f065a493a32dea810b04797a64326
deletions | additions
diff --git a/We_quantify_the_mass_dependence__.tex b/We_quantify_the_mass_dependence__.tex
index f964995..e90ff49 100644
--- a/We_quantify_the_mass_dependence__.tex
+++ b/We_quantify_the_mass_dependence__.tex
...
We quantify the mass-dependence in Fig. 3 by
showing the relative number of dipole-suppressed stars (those below the dashed
line in Fig. 2) in narrow mass intervals.
We see no suppression in stars below 1.1\msun.
This coincides with the mass below
which stars do not form convective cores during their hydrogen-core burning phase \citep{Kippenhahn_1990}.
The onset of magnetic suppression above this threshold suggests the existence of
convectively driven magnetic dynamos in the cores of at least some hydrogen-core burning (main-sequence)
stars, as shown in 3D hydrodynamical modeling of these stars \citep{Brun_2005}. Red giants do not contain convective cores, therefore we conclude the strong fields in suppressed oscillators are the remnants of the fields produced by core dynamos during the main sequence.
%This agrees well with theoretical predictions based on 3D hydrodynamical modeling of the cores of main-sequence stars \citep{Brun_2005}.
%[THE SENTENCE BEFORE AND AFTER DONT REALLY WORK TOGTHER BUT I FEEL WE NEED TO SAY SOMEHOW WHAT IS SAID IN THE FOLLOWING SENTENCE]
%The resulting strong magnetic fields must have survived long after the dynamo terminated at the end of hydrogen-core burning in order to be detected during the red giant phase. Therefore, dynamo-generated fields are frequently able to settle into long-lived stable configurations \citep{Braithwaite_2004,Braithwaite_2006,Duez_2010}, a result that was not certain from the 3D hydrodynamical simulations.
% The gradual increase in suppression may result from the increasing size of
% the convective core in more massive stars, which generates stronger
% magnetic fields that survive after hydrogen burning ceases in the core.
% [Jim/Matteo elaborate?]
Figure We quantify the mass dependence in Fig. 3
shows that by showing the
incidence of magnetic suppression increases with mass.
Red giants above 1.6\msol\ show a remarkable suppression rate relative number of
50-60\%.
These evolved from main-sequence A-type stars, among which only up to $\approx 10$\% are observed to have strong fields at their surfaces
\citep{2008CoSka..38..443P}.
%We conclude that main sequence magnetic A dipole-suppressed stars
can only account for a small fraction of (those below the
dashed line in Fig. 2) in narrow
mass intervals. We see no suppression in red giants
below 1.1\msol, which
coincides with
suppressed modes.
We conclude that these magnetic A stars represent only the
tip of mass below which they did not have convective cores
during the
iceberg, and core-hydrogen-burning phase \citep{Kippenhahn_1990}. The onset
of magnetic suppression above this threshold suggests that
a much larger fraction at least some of
A those stars
have strong had convectively driven magnetic
fields hidden dynamos in their
cores.
%The rapid fractional increase reaching 50-60\% for stars above 1.6\msol, coincides
%with the mass beyond which about 10\% of hydrogen-core burning A-stars are
%known to show strong magnetic fields on cores during
the
surface [Power2008].
%[The large fraction core-hydrogen-burning (main-sequence) phase. This is supported by 3D
hydrodynamical modeling of
suppressed these stars
above 1.6\msol\ coinsides with
%the masses of A stars, of which up to 10\% are known \citep{Brun_2005}. Red giants no
longer contain convective cores, leading us to
have strong
%surface fields[REFS].]
%This further supports that the suppression arises from a magnetic field.
%Even more interesting, it shows conclude that the
previously known strong
magnetic
A
%stars detected through their surface fields
in suppressed oscillators are
only the
tip remnants of the
%iceberg and a much larger fraction of A stars host strong magnetic fields
%hidden in their core.
%, than anticipated purely from their observable surface fields. produced by core dynamos during the main sequence.