HARPS-N high spectral resolution observations of Cepheids I. The Baade-Wesselink projection factor of Cep revisited

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Volume 597 (January 2017)

A&A, 597 (2017) A73

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Table 3

The observational quantities, D, p_obs, and f_grad, are listed for each line of Table 2.


	HARPS-N observations			Hydrodynamical model
Line	D ^a	p_{obs ± σ_fluor−stat ± σ_d−stat ± σ_d−syst} ^b	f_grad ^c	p_hydro ^d	p₀ ^e

Line 1	0.281 _±0.001	1.287 _{±0.031±0.014±0.023}	0.983 _±0.007	1.307	1.360
Line 2	0.147 _±0.001	1.323 _{±0.031±0.014±0.023}	0.991 _±0.004	1.328	1.365
Line 3	0.348 _±0.001	1.280 _{±0.031±0.014±0.023}	0.979 _±0.009	1.304	1.369
Line 4	0.573 _±0.001	1.282 _{±0.031±0.014±0.023}	0.967 _±0.014	1.292	1.375
Line 5	0.297 _±0.001	1.297 _{±0.031±0.014±0.023}	0.982 _±0.008	1.309	1.375
Line 6	0.612 _±0.001	1.282 _{±0.031±0.014±0.023}	0.964 _±0.015	1.288	1.375
Line 7	0.562 _±0.001	1.273 _{±0.031±0.014±0.023}	0.967 _±0.014	1.272	1.376
Line 8	0.500 _±0.001	1.285 _{±0.031±0.014±0.023}	0.971 _±0.012	1.297	1.378
Line 9	0.364 _±0.001	1.307 _{±0.031±0.014±0.023}	0.979 _±0.009	1.302	1.383
Line 10	0.326 _±0.001	1.329 _{±0.031±0.014±0.023}	0.981 _±0.008	1.301	1.387
Line 11	0.429 _±0.001	1.295 _{±0.031±0.014±0.023}	0.975 _±0.011	1.304	1.385
Line 12	0.283 _±0.001	1.300 _{±0.031±0.014±0.023}	0.983 _±0.007	1.312	1.385
Line 13	0.290 _±0.002	1.294 _{±0.031±0.014±0.023}	0.983 _±0.008	1.304	1.386
Line 14	0.317 _±0.002	1.292 _{±0.031±0.014±0.023}	0.981 _±0.008	1.310	1.387
Line 15	0.497 _±0.001	1.280 _{±0.031±0.014±0.023}	0.971 _±0.012	1.290	1.389
Line 16	0.348 _±0.001	1.301 _{±0.031±0.014±0.023}	0.979 _±0.009	1.301	1.389
Line 17	0.366 _±0.001	1.323 _{±0.031±0.014±0.023}	0.978 _±0.009	1.297	1.390

Notes. The quantities p_hydro, p₀ and f_o−g are derived from hydrodynamical model.

^(a)

The line depth D is calculated at minimum radius of the star.

^(b)

The observational projection factors p_obs is derived from HARPS-N and FLUOR/CHARA interferometric data using the inverse BW approach (Sect. 3.2).

^(c)

The f_grad coefficient involved in the projection factor decomposition (p = p₀f_gradf_o−g, Nardetto et al. 2007) is derived from Eqs. 5 and 6 (Sect. 4.2).

^(d)

The inverse projection factors p_hydro is calculated with the hydrodynamical model (Sect. 4.1).

^(e)

The modeled geometric projection factor p₀ is derived in the continuum next to each spectral line. The f_o−g quantity, which is obtained using the projection factor decomposition (), is derived in Sect. 5.

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