Comparative modelling of the spectra of cool giants

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Table 4

Overview of model grid parameters used by different groups in Experiment 1.

ID^a	T _eff	log g	[Fe/H]^b
	(K)^b	(cm s^-2)^b

M1	3600 to 4000^c/50	0.5, 1.0, 1.5	0.0, −0.3, −0.5
M2	3500 to 4100^d/100	0.5 to 2.0/0.5	−0.5 to +0.5/0.25
M3^e	2500 to 8000	0.0 to 5.0	−5.0 to +1.0
M4	3800 to 4300/50	0.0 to 3.0/0.5	0.0, −0.25
M5	2500 to 8000/250^f	−1 to 5/0.5	−5 to 1/^g
M6	3750 to 4250/200	0.0 to 2.0/1.0	–1.0 to 0.5/0.1
A1	3500 to 13000/250	0.0 to 5.0/0.5	−1.5 to +0.5/0.5
A2	3500 to 6000/250	0.0 to 5.0/0.5	−1.5 to +0.5/0.5
A3	3000 to 8000/100	0.0 to 3.0/0.1	0.0^j
A4	3500 to 6250/250	0.0 to 5.0/0.5	+0.5, +0.2, +0.0;
			−0.5 to −4.5/0.5^h
A5	3500 to 6000/250	0.0 to 5.0/0.5	0.0, –1.0
P	3500 to 4500/125	1.0 to 2.5/0.5	0.0, −0.5
T	2800 to 4000/100	−0.52 to 1.34/^g	0.0
C	2600 to 4000/200	−0.5, 0.0	−0.5, 0.0

Notes.

^(a)

For the group IDs see the subsections of Sect. 3.

^(b)

A range of parameters is given in the format: minimum value to maximum value/step size. Comma-separated values indicate a discrete set of parameter values.

^(c)

T_eff range chosen on the basis of an educated guess from the strength of the TiO features in the spectra, 81 models.

^(d)

T_eff range centered on T_eff from photometric calibrations.

^(e)

One value of [α/Fe] and 2905 models for M3a, five values of [α/Fe] and 16 783 models for M3b.

^(f)

Step size is 100 K between 2500 and 4000 K. In addition, a small set of C-rich models was used.

^(g)

Variable step size.

^(h)

[Fe/H] −1.5 to 0.2/0.1 for a subgrid with T_eff 3000 to 4000 K.

^(j)

One model with a solar abundance pattern was calculated, and one model with α elements enhanced by +0.4.

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