Measurement of the Surface Gravity of η Bootis

March 2007 • 2007ApJ...657.1058V

Authors • van Belle, Gerard T. • Ciardi, David R. • Boden, Andrew F.

Abstract • 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_-0.0140 mas, which indicates a linear radius of R=2.672+/-0.028 R_solar. A bolometric flux estimate of F_bol=(22.1+/-0.28)×10^-7 ergs cm^-2 s^-1 is computed, which indicates an effective temperature of T_eff=6100+/-28 K and a luminosity of L=8.89+/-0.16 L_solar 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 s^-2] is established for η Boo.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2007ApJ...657.1058V
• PDF https://stacks.iop.org/0004-637X/657/1058/pdf
• PREPRINT http://arxiv.org/abs/astro-ph/0701120
• DATA https://irsa.ipac.caltech.edu/bibdata/2007/V/2007ApJ...657.1058V.html
• ELECTR https://doi.org/10.1086%2F510830
• SPIRES http://inspirehep.net/search?p=find+eprint+astro-ph/0701120