Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-03-16
Astrophys.J. 609 (2004) 417-422
Astronomy and Astrophysics
Astrophysics
15 pages, 4 figures. Accepted for publication in ApJ
Scientific paper
10.1086/421041
Effective temperatures and radii for 92 planet-hosting stars as determined from the InfraRed Flux Method (IRFM) are presented and compared with those given by other authors using different approaches. The IRFM temperatures we have derived are systematically lower than those determined from the spectroscopic condition of excitation equilibrium, the mean difference being as large as 110 K. They are, however, consistent with previous IRFM studies and with the colors derived from Kurucz and MARCS model atmospheres. Comparison with direct measurements of stellar diameters for 7 dwarf stars, which approximately cover the range of temperatures of the planet-hosting stars, suggest that the IRFM radii and temperatures are reliable in an absolute scale. A better understanding of the fundamental properties of the stars with planets will be achieved once this discrepancy between the IRFM and the spectroscopic temperature scales is resolved.
Melendez Jorge
Ramirez Ivan
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