| Issue |
Astron. Astrophys. Suppl. Ser.
Volume 140, Number 3, December II 1999
|
|
|---|---|---|
| Page(s) | 261 - 277 | |
| DOI | https://doi.org/10.1051/aas:1999521 | |
| Published online | 15 December 1999 | |
The effective temperature scale of giant stars (F0–K5)
II. Empirical calibration of 
versus colours and [Fe/H]
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
We present calibrations of the effective temperatures of giant stars
versus [Fe/H] and
colours 
, 
, 
, 
, 
, 
, 
, 
, 
, 
, 
and 
. These calibrations are based on a large sample of field
and globular cluster stars which roughly cover spectral types from F0 to K5. Their
effective temperatures, scaled to direct
determinations
via reliable angular diameter measurements, were derived by applying
the infrared flux method. The empirical relations have been fitted to
polynomials of the form 
by using the
least squares method. The precision of the fits ranges from 40 K for
to 170 K for . We tabulate intrinsic colours of giant stars in the ranges: 3500 K 
8000 K; -3.0 
. We also present the calibration of BC(V) as a
function of log
and metallicity. Finally, we compare the resulting scale of
temperatures with previous works.
Key words: stars: fundamental parameters / stars: Population II / stars: giants / stars: atmospheres / stars: general
© European Southern Observatory (ESO), 1999