A pilot search for mm-wavelength recombination lines from emerging ionized winds in pre-planetary nebulae candidates

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Table 2

Line parameters from Gaussian profile fitting for RRL detections.

Line^a	Frequency	^∫T_LdÆ	V _LSR	FWHM	T _L	rms^b
	(GHz)	(K km s^-1)	(km s^-1)	(km s^-1)	(mK)	(mK)

CRL 618
H41α	92.03443	9.02±0.12	−24.3±0.3	47.6±0.8	178	4
H39α	106.73736	11.90±0.05	−24.0±0.1	46.5±0.2	240	2
H31α	210.50177	16.4±0.2	−23.6±0.2	38.3±0.6	403	12
H30α	231.90093	20.2±0.1	−22.9±0.1	37.1±0.2	512	5
H51β	93.60732	1.7±0.1	−22.9±1.7	60±3	27	4
H49β	105.30186	2.17±0.04	−22.6±0.5	59.4±1.2	34	2
H48β	111.88507	2.26±0.06	−23.4±0.6	53.2±1.5	40	4
H55γ	109.53600	0.31±0.12	−23±4	23±14	12	6
He41α	92.07194	0.76±0.07	−25.0±1.8	42±5	17	4
He39α^*	106.78085	1.10±0.04	−24.0±0.0	46.5±0.0	22	2
He30α	231.99543	2.08±0.13	−23.5±1.2	42±4	46	5
M 2-9
H41α	92.03443	............	............	............	............	7
H39α	106.73736	0.32±0.02	75.5±1.5	40.9±3.1	7	1
H31α	210.50177	............	............	............	............	27
H30α	231.90093	0.79±0.07	73.7±1.6	34.7±4.1	21	5
H51β	93.60732	............	............	............	............	6
H49β	105.30186	............	............	............	............	2
H48β	111.88507	............	............	............	............	3
H55γ	109.53600	............	............	............	............	2
MWC 922
H41α	92.03443	0.69±0.18	29±5	40±13	16	8
H39α	106.73736	0.89±0.03	32.3±0.5	32.5±1.2	26	2
H31α-blue^**	210.50177	3.0±0.5	19.2±1.2	15±3	190	40
H31α-red^**	210.50177	2.8±0.5	45.1±1.6	18±4	150	40
H30α-blue^**	231.90093	2.85±0.09	19.1±0.3	17.9±0.7	150	6
H30α-red^**	231.90093	3.0±0.1	46.2±0.3	20.7±0.8	134	6
H51β	93.60732	............	............	............	............	8
H49β	105.30186	0.12±0.02	38±3	29±7	4	2
H48β	111.88507	0.22±0.04	37±3	36±7	6	3
H55γ	109.53600	............	............	............	............	3

Notes. Continuum-subtracted line fluxes, T_L, are in units of antenna temperature.

^(a)

Standard line notation, i.e., n + Δn → n level transitions with Δn = 1, 2, or 3 for α, β, and γ lines, respectively.

^(b)

Formal rms noise for a ΔÆ ~ 3 km s^-1 resolution, as in Figs. 3–5. Baseline subtraction or absolute calibration uncertainties are not included.

^(*)

Uncertain due to line blending; line center and width fixed to match the corresponding H39α values.

^(**)

The blue and read intensity peaks of the two-horned profile of the H30α and H31α lines in MWC 922 were fitted using two Gaussians.

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