Study of the aluminium content in AGB winds using ALMA - Indications for the presence of gas-phase (Al2O3)n clusters

L. Decin; A. M. S. Richards; L. B. F. M.  Waters; T. Danilovich; D. Gobrecht; T. Khouri; W. Homan; J. M. Bakker; M. Van de Sande; J. A. Nuth; E. De Beck

doi:10.1051/0004-6361/201730782

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Volume 608 (December 2017)

A&A, 608 (2017) A55

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Table 1

ALMA observation parameters for the Al-compounds in IK Tau and R Dor.

Species	Chan^a	Vel^b	Beam	σ _rms
	(MHz)	(km s^-1)	(mas × mas, PA)^c	(mJy)

	IK Tau

Continuum	15.2 × 10³		180 × 160, 27°	0.047
AlCl	1.95	1.7	160 × 130, 43°	1.6
AlCl	5.9	5	200 × 160, 42°	1.4
AlOH	1.95	1.7	150 × 140, −22°	5.0
AlOH	5.9	5	190 × 170, −1°	2.4
AlO	1.95	1.7	160 × 130, −15°	5.0
AlO	5.9	5	190 × 170, −20°	2.6

	R Dor

Continuum	11.6 × 10³		150 × 140, –5°	0.047
AlCl	0.97	0.9	150 × 130, 20°	2.7
AlCl	2.5	2.2	180 × 180, 10°	1.4
AlOH	0.97	0.9	170 × 120, −48°	3.8
AlOH	2.5	2.2	200 × 160, −48°	2.4
AlO	0.97	0.9	160 × 130, −26°	4.0
AlO	2.5	2.2	190 × 160, −30°	1.8

Notes.

^(a)

“Chan” is the channel width for the line cubes, or the total line-free bandwidth (spread between 335–362 GHz) for the continuum.

^(b)

“Vel” is the spectral resolution of the image cube.

^(c)

PA is the position angle measured from north to east.

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