Understanding the dynamical structure of pulsating stars: The center-of-mass velocity and the Baade-Wesselink projection factor of the β Cephei star α Lupi

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Volume 553 (May 2013)

A&A, 553 (2013) A112

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Table 1

HARPS observations results for α Lup and τ¹ Lup for the O ii 4705.3 Å spectral line (see also Figs. 1 and 2).

JD_c	Phase	Cy.	R V _c	FWHM	D	A	S/N
[d]			[km s^-1]	[Å]		[%]
^a	^b	^c	^d	^e	^f	^g	^h	ⁱ

α Lup
430.055	0.00	1	3.4 ±0.6	0.396 ±0.002	0.18	–10.00 ±0.81	356	2.2
430.069	0.05	1	1.3 ±0.4	0.389 ±0.002	0.18	–9.33 ±0.76	395	2.7
430.087	0.12	1	1.0 ±0.5	0.385 ±0.002	0.17	–12.26 ±0.92	347	2.6
431.961	0.33	8	9.4 ±0.7	0.377 ±0.003	0.17	–13.46 ±1.34	255	1.4
431.984	0.42	8	14.4 ±0.5	0.367 ±0.002	0.18	–10.01 ±0.82	381	1.9
430.963	0.49	4	20.4 ±0.8	0.376 ±0.002	0.18	–4.39 ±1.00	298	1.6
432.006	0.51	8	19.1 ±0.6	0.367 ±0.002	0.18	–7.65 ±0.80	373	1.6
430.997	0.62	4	23.3 ±1.0	0.404 ±0.002	0.17	1.54 ±1.04	279	1.2
431.025	0.73	4	20.1 ±0.8	0.400 ±0.002	0.17	–5.10 ±0.94	315	1.0
431.060	0.86	4	12.2 ±0.6	0.383 ±0.002	0.18	–6.50 ±0.80	359	2.5
431.084	0.96	4	6.7 ±0.5	0.389 ±0.002	0.18	–10.06 ±0.79	387	2.3
τ¹ Lup
431.091	0.12	7	–23.32 ±1.25	0.388 ±0.004	0.11	–2.49 ±2.42	200	0.8
431.981	0.14	12	–22.77 ±1.18	0.337 ±0.004	0.12	0.48 ±2.41	191	0.8
430.049	0.25	1	–20.48 ±0.90	0.381 ±0.005	0.11	–9.50 ±2.23	225	1.3
432.003	0.27	12	–21.07 ±1.27	0.384 ±0.005	0.11	–1.91 ±2.58	187	0.9
430.060	0.31	1	–19.78 ±1.09	0.378 ±0.006	0.11	–7.96 ±2.80	186	0.5
432.017	0.34	12	–19.06 ±1.01	0.388 ±0.005	0.10	–7.25 ±2.53	214	1.4
430.066	0.35	1	–19.25 ±0.76	0.384 ±0.004	0.11	–8.73 ±1.98	269	0.9
430.075	0.40	1	–17.61 ±0.81	0.392 ±0.006	0.11	–16.34 ±2.31	256	0.8
430.969	0.44	6	–18.00 ±1.14	0.385 ±0.004	0.11	–4.22 ±2.26	216	0.8
430.091	0.49	1	–15.44 ±0.78	0.391 ±0.005	0.11	–13.26 ±2.24	247	1.4
430.987	0.54	7	–15.64 ±0.83	0.359 ±0.004	0.11	6.46 ±2.09	233	0.7
431.011	0.67	7	–14.57 ±0.79	0.333 ±0.003	0.12	3.38 ±1.92	235	0.9
431.031	0.79	7	–16.81 ±0.81	0.309 ±0.003	0.13	2.79 ±1.77	244	1.0
431.053	0.91	7	–19.85 ±1.24	0.340 ±0.004	0.13	3.61 ±2.15	196	0.8
431.068	0.99	7	–21.73 ±1.49	0.351 ±0.004	0.13	1.83 ±2.59	168	0.9

Notes.

^(a)

JD_c, average Julian date of observation defined by JD_c = JD−2 455 000 [in days].

^(b)

Pulsation phase of observation using the ephemeris indicated in the text.

^(c)

Cy., pulsating cycle of the star corresponding to observation.

^(d)

RV_c, heliocentric radial velocity corresponding to the first moment of the spectral line [in km s^-1].

^(e)

FWHM, full-width at half-maximum derived from the bi-Gaussian fit [in Angstroms].

^(f)

D, line depth derived from the bi-Gaussian fit [no dimension]. Errors bars are not indicated but are of the order of 10^-4.

^(g)

A, asymmetry derived from the bi-Gaussian fit [in percentage].

^(h)

S/N, signal-to-noise ratio calculated in the continuum next to the O ii 4705.3 Å spectral line.

⁽ⁱ⁾

, reduced χ² factor corresponding to the bi-Gaussian fit.

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