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Fig. 1


ALMA AlO, AlOH, and AlCl data extracted for an aperture size of 320 mas (300 mas) and 800 mas (1000 mas) for IK Tau (R Dor). The frequency range is shifted to rest frequency using a local standard of rest velocity, vLSR, of 35 km s-1 for IK Tau and of 7 km s-1 for R Dor. Close to the AlOH emission, NS J = 15/2–13/2 transition is detected in IK Tau (at rest frequency 346.2201 GHz) and two unidentified lines (“U”) in R Dor at a rest frequencies of 346.123 GHz and 346.196 GHz.

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