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Volume 140 / No 3 (December II 1999)

Astron. Astrophys. Suppl. Ser., 140 3 (1999) 261-277

Abstract

Free Access

Issue		Astron. Astrophys. Suppl. Ser. Volume140, Number3, December II 1999


Page(s)		261 - 277
DOI		https://doi.org/10.1051/aas:1999521
Published online		15 December 1999

Astron. Astrophys. Suppl. Ser.140, 261-277 (1999)

The effective temperature scale of giant stars (F0–K5)

II. Empirical calibration of $T_{{\rm eff}}$ versus colours and [Fe/H]

A. Alonso,S. Arribas andC. Martínez-Roger

Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain

Send offprint request to: A. Alonso

Received: 19 March 1999
Accepted: 23 July 1999

Abstract

We present calibrations of the effective temperatures of giant stars versus [Fe/H] andcolours $(U-V)$ , $(B-V)$ , $(R-I)$ , $(V-R)$ , $(V-I)$ , $(V-K)$ , $(J-H)$ , $(J-K)$ , $(I-K)$ , $(V-L')$ , $(b-y)$ and $(u-b)$ . These calibrations are based on a large sample of fieldand globular cluster stars which roughly cover spectral types from F0 to K5. Theireffective temperatures, scaled todirect $T_{{\rm eff}}$ determinationsvia reliable angular diameter measurements, were derived by applyingthe infrared flux method. The empirical relations have been fitted topolynomials of the form $\theta_{{\rm eff}} = P({\rm colour,[Fe/H]})$ by using theleast squares method. The precision of the fits ranges from 40 K for $(V-K)$ to 170 K for $(J-H)$ . We tabulate intrinsic colours of giant stars in the ranges: 3500 K $\leq T_{{\rm eff}} \leq$ 8000 K; -3.0 $\leq [{\rm Fe/H}] \leq +0.5$ . We also present the calibration of BC(V) as afunction of log $(T_{{\rm eff}})$ and metallicity. Finally, we compare the resulting scale oftemperatures with previous works.