The central stars
The central stars
The central stars
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ALMA and the circumstellar structureClump optical depths and flux densities:τ d,cl ≈ 0.1[Mcl10 −6 ] [ 1013r clS d,cl ≈ 0.006[ ] [ ] [ ] [ ]Mcl Td ν 321 kpc10 −6 mJy1000 230 D] 2 [ ν230]τ CO,cl ≈ 100[Mcl10 −6 ] [ 1013] 2 [ ] 2 10002 → 1 liner cl T xS CO,cl ≈ 0.03[Mcl10 −6 ] [ 1000T x] [ ] 2 1 kpcmJy 2 → 1 lineDNote that S masers >> S CO,cl