No asymptotic giant branch (= AGB) phase for some of the solar mass stars in NGC 6752.
If this major revision of the existing theory of stellar evolution is confirmed, it will have major consequences.
The paper was published online, in 'Nature'(which is not a nudist magazine!) on the 29th of May this year. The lead author is Simon W. Campbell of Monash University.
They want me to pay $32 for this paper, which is totally unreasonable.....
Aha!! Here is the preprint of this article!!
AGB missing in N6752__1305.7090.pdf
I hope that Dana will comment, as he seems to be very good on the Hertzprung-Russell diagram (color vs magnitude) and the theory of stellar evolution.
P.S.
the popular-level writeup of this work at the ESO website is reasonably clear and understandable.