Neutral and ionised gas around the post-red supergiant IRC +10 420 at AU size scales

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Table 1

Technical overview of the AMBER observations of IRC +10 420.

Config.	Date	Station	B	PA	DIT	τ _coh	⟨ Seeing ⟩	N _files	N _frames	V _cal	V_Brγ/V_cont
			(m)	(°)	(s)	(ms)	(arcsec)

A	2008-05-17	U1-U3	77.1	30.1	0.05	2.8	0.68	9	1000	0.85 ± 0.07	0.75 ± 0.01
		U3-U4	62.0	110.9						0.88 ± 0.07	0.79 ± 0.01
		U4-U1	106.3	65.3						0.86 ± 0.07	0.58 ± 0.005

B	2008-06-22	U2-U3	34.9	39.6	0.05	2.4	0.78	9	1000	–	0.93 ± 0.005
		U3-U4	61.8	111.2						–	0.82 ± 0.01
		U4-U2	80.0	86.8						–	0.70 ± 0.01

C¹	2009-04-13	U1-U2	41.8	19.2	0.187	4.2	1.1	5	200	0.86 ± 0.10	0.90 ± 0.005
		U2-U3	34.0	37.3						0.97 ± 0.07	–
		U3-U1	74.8	27.8						0.77 ± 0.10	0.80 ± 0.005

Notes.Calibrated visibilities correspond to 20% frame selection for config. A, and 5% for config. C. The Detector Integration Times (DIT) are the integration times per individual exposure.

⁽¹⁾

Observations with FINITO.

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