Constraints on the multiplicity of the most massive stars known: R136 a1, a2, a3, and c

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Table 1

Binary status of R 136 al, a2, a3, and c.

Object	Condition	N IV 4058	N V 4603,4621	He II 4686	Ν V 4945
al	Eq.(1)	No	No	Yes ^(a)	No
al	Eq.(2)	No	No	No	No
al	Binary?	No	No	No	No

a2	Eq.(1)	No	No	Yes ^(a)	No
a2	Eq.(2)	No	No	No	No
a2	Binary?	No	No	No	No

a3	Eq.(1)	No	No	No	No
a3	Eq.(2)	No	No	No	No
a3	Binary?	No	No	No	No

с	Eq.(1)	No	No	Yes	No
с	Eq.(2)	Yes	Yes	Yes	Yes
с	Binary?	No	No	Yes	No

Notes. ^(a)This resuit should be taken with caution, since contamination between al and a2 in the streng He II λ4686 line is possible due to blending of the PSFs.

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