The Hα Balmer line as an effective temperature criterion

Details The Hα Balmer line as an effective temperature criterion The Hα Balmer line as an effective temperature criterion

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sf2a.conf..267c&link_type=abstract

SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: G. Alecian, K. Belkacem,

Astronomy and Astrophysics

Astrophysics

Stars:Atmospheres, Stars:Fundamental Parameters, Line:Profile

Scientific paper

For eleven stars with an accurate effective temperature derived from their apparent angular diameter we determine the effective temperature of the Kurucz Atlas9 model that provides the best fit of the computed theoretical Hα profile (using the recent theoretical advances) with the corresponding observed profile, extracted from the S4N spectroscopic database. The two sets of effective temperatures have a significant offset, but are tightly correlated, with a correlation coefficient of 0.9976. The regression straight line of T_{eff}(direct) versus T_{eff}(Hα) enables us to reach the true effective temperature from the spectroscopic observation of the Hα profile, with an rms error of only 30 K. This provides a way of obtaining the true effective temperature of a reddened star.

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