On the binarity of the classical Cepheid X Sagittarii from interferometric observations

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Table 2

Parameters of X Sgr companion, and LD diameters.

Δx [mas]	Δy [mas]	r₂ [mas]	f

8.00 ± 0.02 E	7.15 ± 0.04 S	<0.5	(6 ± 1) × 10^-3

Phase^a	Date	θ_LD [mas]

0.83	2011 May 03	1.47 ± 0.01 ± 0.04
0.54	2011 Apr. 24	1.36 ± 0.09 ± 0.04
0.35	2012 Mar. 31^b	1.59 ± 0.08 ± 0.04

Notes. Random errors (first ones) and systematics (second ones) are distinguished.

^(a)

The pulsation phase was estimated using the formula provided by Szabados (1989) for constraining the pulsation period and the epoch of maximum of the different data sets.

^(b)

For the 2012 Mar. 31 night a pure LD model is adopted, given the undetermined binary parameters.

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