Measurement of the Surface Gravity of η Boo

Details Measurement of the Surface Gravity of η Boo Measurement of the Surface Gravity of η Boo

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20923004v&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #230.04; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Direct angular size measurements of the G0IV subgiant η Boo from the Palomar Testbed Interferometer are presented, with limb-darkened angular size of θLD=2.1894+0.0055-0.0140, which indicate a linear radius of R=2.672 ± 0.028 RSUN. A bolometric flux estimate of FBOL = 22.1 ± 0.28 × 10-7 erg cm-2 s-1 is computed, which indicates an effective temperature of TEFF =6100 ± 28 K and luminosity of L = 8.89 ± 0.16 LSUN 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 log g=3.817 ± 0.016 [cm s-2] is established for η Boo.

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