Turnover Timescale Models

(1) Noyes et al. 1984:

tau(c) = 1.362-0.166x+0.025x^2 - 5.323x^3, x>0........ = 1.362-0.14x, x<0

where x=1-(B-V)

• cubic fit through Mt. Wilson data with alpha = 1.9 (produced the least scatter)

(2) Landin et al. 2010:

• computer tau(c) using ATON 2.3 stellar evolutionary code

(3) Wright et al. 2011:

logtau(c) = -2.16+1.50x-0.13x^2 , x >3.5.......=0.73+0.22x, x<3.5

where x=V-Ks

OR

logtau(c)=1.16-1.49log(M)-0.54log^2(M)

Most other papers use Noyes 1984 for tau(c)