2007ApJ...657.1058V

Direct angular size measurements of the G0 IV subgiant η Boo from the Palomar Testbed Interferometer are presented, with a limb-darkened angular size of θ_LD=2.1894^+0.0055_–0.0140mas, which indicates a linear radius of R=2.672±0.028 R_☉. A bolometric flux estimate of F_bol=(22.1±0.28)x10^–7 ergs/cm2/s is computed, which indicates an effective temperature of T_eff=6100±28 K and a luminosity of L=8.89±0.16 L_☉for this object. Similar data are established for a check star, HD 121860. The η Boo results are compared to, and confirm, similar parameters established by the MOST asteroseismology satellite. In conjunction with the mass estimate from the MOST investigation, a surface gravity of logg=3.817±0.016 [cm/s2] is established for η Boo.