Dynamical structure of the pulsating atmosphere of RR Lyrae - I. A typical pulsation cycle

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Table 4

Measurements of the very redshifted component within the Na D line profiles.

Date	φ	V_radial	FWHM	EW
(yyyy-mm-dd)		(km s⁻¹)	(Å)	(Å)

1994-08-03^a	0.083	49.3	0.168	0.1554
1996-08-02^a	0.083	50.6	0.189	0.1541
1997-06-03^a	0.083	50.2	0.154	0.1580
1997-08-05^a	0.083	51.2	0.199	0.1565
1997-08-09^a	0.083	51.7	0.205	0.1558
1997-08-31^a	0.083	50.7	0.166	0.1652
2013-10-16^b	0.083	51.5	0.160	0.1443
2014-05-01^c	0.008	50.4	0.197	0.1686
2016-07-18^b	0.005	48.4	0.206	0.1652
2017-05-17^b	0.034	48.5	0.171	0.1543

Mean and RMS	−	50.3 ± 1.2	0.182 ± 0.018	0.1577 ± 0.0070

Notes. V_radial by Gaussian fitting with respect to the stellar rest frame, FWHM corrected from instrument function, and EW at φ = 0.000−0.083 from the 1994–2017 spectra. Spectrograph used for observation: ^(a)ELODIE; ^(b) ESHEL I; ^(c) ESHEL II.

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