Astronomy & Astrophysics

**Table 1:** Summary of the AMBER $\eta$ Car observations using the UT2, UT3, and UT4 telescopes.
Date [UT]	Time [UT]		Orbital	Spectral	Line within	DIT^d	$N_{\rm\eta~Car}^f$	Calibrator	$N_{\rm calib.}^g$	Calibrator
	start	end	phase^e	mode	spectral range					uniform disk
						[ms]				diameter [mas]
2004 Dec. 26	07:52	08:16	0.267	MR-K	Br $\gamma$	40	7500	HD 93030	5000	0.39^a
	08:19	08:32	0.267	MR-K	He I 2.059 $\mu$ m	40	5000	HD 93030	5000	0.39^a
2005 Feb. 25	04:33	04:43	0.298	MR-K	Br $\gamma$	50	5000	HD 89682	2500	3.08^b
	04:55	05:05	0.298	MR-K	He I 2.059 $\mu$ m	50	5000	HD 89682	2500	3.08^b
2005 Feb. 26	08:16	08:57	0.299	HR-K	Br $\gamma$	82	7500	L Car	2500	2.70^c

^a Uniform disk (UD) diameter estimated using the method described by Dyck et al. (1996). ^b UD diameter taken from the CHARM2 catalog (Richichi et al. 2005). ^c UD diameter of L Car at the time of the AMBER high-resolution observations derived from the limb-darkened diameter $d_{\rm LD}=2.80~$ mas at the L Car pulsation phase $\phi=0.0$ (Kervella et al. 2006,2004b) and $d_{\rm UD}/d_{\rm LD}=0.966$ (Kervella et al. 2004a). ^d Detector integration time per interferogram. ^e The orbital phase was computed assuming a zero point at JD 2 450 800.0 and a period of 2024 days (Corcoran 2005). ^f Number of $\eta$ Car interferograms. ^g Number of calibrator interferograms.

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