Figure 15.

Specific angular momentum of white dwarfs (WD) and neutron stars (NS) as a function of initial mass of the progenitor star, as computed by Suijs et al. [158]. Green circles: initial core angular momentum, blue triangles: including known hydrodynamic angular momentum transport mechanisms, red squares: including the Tayler–Spruit magnetic torque prescription. The dashed horizontal line indicates the spectroscopic upper limit on the whitedwarf spins obtained by Berger et al. [159]. Star symbols represent astroseismic measurements from ZZ Ceti stars and the green hatched area is populated by magnetic white dwarfs. The three black open pentagons correspond to the youngest Galactic neutron stars, while the green pentagon is thought to roughly correspond to magnetars, where the vertical-dotted green line indicates the possibility that magnetars are born rotating faster. See Suijs et al. [158] for more details.