The HD 98800 quadruple pre-main sequence system - Towards full orbital characterisation using long-baseline infrared interferometry

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Volume 655 (November 2021)

A&A, 655 (2021) A15

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Table 1.

Relative astrometric position of the secondary component, flux ratio, and resolved flux from PIONIER observations.

MJD	Δα	Δδ	σ_PA	σ_maj	σ_min	f₂/f₁	f_res^(a)	Baselines	Seeing	τ₀
	(mas)	(mas)	(°)	(mas)	(mas)	(%)	(%)		(arcsec)	(ms)
AaAb

58601.100162	12.38	−18.35	−13.68	0.02	0.01	15.2 ± 0.2	8.6 ± 0.5	D0-G2-J3-K0	1.05	4.98
58615.047718	15.21	−16.68	−75.72	0.07	0.01	15.3 ± 0.2	8.9 ± 0.5	A0-B2-C1-D0	1.08	5.50
58882.282610	15.80	−16.10	68.64	0.04	0.02	15.4 ± 0.1	9.1 ± 0.9	A0-B2-C1-D0	0.93	4.05
58899.329997	18.34	−13.19	53.01	0.02	0.01	14.6 ± 0.3	7.2 ± 1.1	D0-G2-J3-K0	0.73	6.23
58931.293872	20.32	−5.61	−6.01	0.03	0.02	13.8 ± 0.2	6.7 ± 0.3	D0-G2-J3-K0	0.58	10.01
59282.347290	6.26	14.37	−4.01	0.01	0.01	14.5 ± 0.2	9.3 ± 0.7	D0-G2-J3-K0	0.92	6.19
59292.225719	2.72	14.33	21.17	0.01	0.01	15.3 ± 0.3	8.7 ± 0.6	D0-G2-J3-K0	0.45	5.14
59295.208560	1.50	14.08	66.67	0.01	0.01	13.8 ± 0.3	8.8 ± 0.7	D0-G2-J3-K0	0.81	5.13

BaBb

58601.106553	16.90	−1.44	−50.59	0.01	0.01	70 ± 1	12 ± 1	D0-G2-J3-K0	1.05	4.98
58615.013389	17.62	−3.40	33.15	0.03	0.01	65 ± 1	13 ± 1	A0-B2-C1-D0	1.08	5.50

Notes.

^(a)

Parameter to take the background cross-contamination into account (non-coherent light), parametrised in CANDID as a resolved flux. The last two columns correspond to the atmospheric conditions for each epoch: the seeing and coherence time (τ₀), measured by the seeing monitor.

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