You asked a very good question. Not all B
stars that rotate rapidly are Be stars. Delta
Sco was apparently a normal B star until 2000,
so the secondary might also become one
Delta Sco's v sin i is ~175 km/sec, about
average for a normal B0V star. The secondary,
if it is a normal B3V star, should have a v sin i
of about 200 km/sec and therefore should have
broader and weaker lines.
forgive me for my ignorance of some aspects!
I found this very interesting:
> The secondary will probably have a higher
> rotational velocity than the primary star and
> this may make the lines too broad and
> diffuse to see.
aren't Be stars those that are supposed to rotate
faster than normal B-type stars?
Why is the secondary supposed to rotate faster
in this case while not being the Be star?