Cepheid distances from the SpectroPhoto-Interferometry of Pulsating Stars (SPIPS) - Application to the prototypes δ Cephei and η Aquilae

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Table 4

Parameters of the η Aql fit.

Parameter	Best fit

θ₀^a (mas)	1.694 ± 0.002
E(B − V)	0.161 ± 0.005_stat. ± 0.015_sys.
K excess (mag)	0.018 ± 0.002
H excess (mag)	0.016 ± 0.003
p-factor	1.30 [fixed]
Distance (pc)	396 ± 6
MJD₀ ^b	48069.3905
Period (days)	7.176841 ± 0.000012
Period change (s/yr)	0.18 ± 0.07
Metallicity [Fe/H]	0.05

Reduced χ²	2.3

Adopted mass (M_⊙)	6.3
Average radius (R_⊙)	57.6

Notes. The quantities with uncertainties are adjusted in the model and the other ones are fixed.

^(a)

θ₀ is the Rosseland angular diameter at phase 0, not the average angular diameter over the pulsation cycle ⟨ θ ⟩;

^(b)

adjusted so that the bolometric magnitude reached minimum at phase 0.

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