Centrifugal trapping of cooling gas in F to G-naught supergiants at the edge of this region has been evoked to explain the x-ray deficiency and the rotational braking zone present at one of its edges.
Centrifugal trapping of cooling gas in F to G-naught supergiants at the edge of this region has been evoked to explain the x-ray deficiency and the rotational braking zone present at one of its edges. That change is associated with the replacement of fossilized radiation belts with solar magnetic dynamos in bodies that traverse it. Its onset is marked by the expansion of the hydrogen envelope of a star on a thermal timescale and the collapse of stellar cores. Tracks of stars with 2-5 solar masses are common in this region also noted for a large number of RR Lyrae stars, and when crossing it, supergiants lose 75 percent of their mass and become intermediate stars. FTP, name this triangular space located between the Giant Branch and the high end of the main sequence, whose emptiness is caused by fast stellar evolution across it and which is named for one of the originators of the H-R diagram.
Centrifugal trapping of cooling gas in F to G-naught supergiants at the edge of this region has been evoked to explain the x-ray deficiency and the rotational braking zone present at one of its edges.
Hertzsprung Gap or Hertzsprung's Lacuna (prompt on "Hertzsprung")