Recalibration of Stellar Temperatures and Reddenings

Details Recalibration of Stellar Temperatures and Reddenings Recalibration of Stellar Temperatures and Reddenings

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...186.0308r&link_type=abstract

American Astronomical Society, 186th AAS Meeting, #03.08; Bulletin of the American Astronomical Society, Vol. 27, p.816

Astronomy and Astrophysics

Astronomy

1

Scientific paper

It has long been suspected that the current calibration of stellar T_eff with spectral type has systematic errors. We demonstrate that this suspicion was correct. By comparing synthetic photometry against actual photometry in five photometric systems for a library of stars with high resolution abundance determinations we optimize their temperatures and reddenings using a robust downhill simplex method. The five photometric systems chosen are Johnson--Cousins UBV(RI)_C, Washington CMT_1T_2, Stromgren, Geneva, and Vilnius UPXYZVS. The results permit a partial recalibration of the temperatures of the 2D space of MK spectral types. The reddenings derived for the library stars are a secondary result. The formalism used to compute the interstellar reddenings is that of the authors (1995 A&AS 109, 293). Crudely, the results can be summarized as ``hot stars are not so hot, cool stars not so cool.''

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