The circumstellar environment of HD 50138 revealed by VLTI/AMBER at high angular resolution

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Table 2

Log of the VLTI/AMBER observations of HD 50138 and calibrator HR 2552.

Object name	Observation Date	Time		UT^a array	Baseline range (m)	PA (°)	Spectral mode^b	Wavelength (μm)	DIT^c (s)	UD diameter^d (mas)
		Start	End
HD 50138	23 December 2015	05:54	06:25	UT1-UT3-UT4	100/60/130	216/112/63	MR-K	2.12–2.47	0.2
HR 2552	23 December 2015	06:25	06:30	UT1-UT3-UT4	100/60/130	216/112/63	MR-K	2.12–2.47	0.2	0.65 ± 0.04

Notes.

^(a)

Unit telescope,

^(b)

medium spectral resolution in K band without using the fringe tracker FINITO,

^(c)

detector integration time per interferogram,

^(d)

uniform-disc diameter derived from the software package SearchCal from Jean-Marie Mariotti Center (JMMC).

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