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Table 13

Experiment 1: parameters determined for α Cet from the best fits to the optical spectra by the various participating teams.

Starting parameters from photometry Best fit parameters from spectroscopy Additional quantities
Code T eff log g [Fe/H] T eff log g [Fe/H] [Ca/Fe] RV v mic v mac
(K) (g (cm s-2)) (K) (g (cm s-2)) (km s-1) (km s-1) (km s-1)

M1 −0.5a 3675  ±  50 0.5  ±  0.25 −0.5  ±  0.2 2.5c 3c
M2  ≲3700 3700 1.0 0.0 −25.9 1–2c 5.0
M3a 3867  ±  100 1.15  ±  0.20 −0.22  ±  0.10 −27.6  ±  1.3 2c d
M3b 3718  ±  80 1.31  ±  0.15 −0.02  ±  0.10 −0.32  ±  0.10b −27.6  ±  1.3 2c d
A1 3500 1.0 −2.0
A2 4310  ±  136 1.5  ±  0.1 −0.6  ±  0.1 −26.3  ±  0.4 2c
P 3750  ±  30 1.75  ±  0.25 −0.25  ±  0.25 −26.22 3e 0
C 3820  ±  50 −0.5 0.0  ±  0.2 2.8c 2.3

Notes.  α/Fe]. Methods for photometric parameter determination: M1, M2: MARCS models. Theoretical colour (V − K and J − K) – Teff calibrations (Bessell et al. 1998; van Eck et al. 2011). A1: Kučinskas et al. (2005).

(a)

Photometric colours used to constrain metallicity after spectral fitting.

(b)

[

(c)

Fixed value(s).

(d)

Not taken into account.

(e)

Microturbulence increased from 2.0 to 4.0 km s-1 as log g decreased from 2.5 to 1.0.

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