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

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Table 3

Parameters of the δ Cep fit.

Parameter	Best fit

θ₀^a (mas)	1.420 ± 0.009
E(B − V)	0.032 ± 0.005_stat. ± 0.015_sys.
K excess (mag)	0.025 ± 0.002
H excess (mag)	0.018 ± 0.004
p-factor	1.29 ± 0.02
MJD₀ ^b	48 304.7362421
Period (days)	5.3662906 ± 0.0000061
Period change (s/yr)	−0.069 ± 0.033
Metallicity [Fe/H]	0.06
Distance (pc)	274 [fixed]

	1.7

Adopted mass (M_⊙)	4.8
Average radius (R_⊙)	43.0

Notes. The quantities with uncertainties are adjusted in the model and the other ones are fixed. We note that the uncertainties are purely statistical and do not take into account systematics, such as the uncertainties on the distance, for example (274 ± 11 pc, 7).

^(a)

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

^(b)

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

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