Water deuterium fractionation in the low-mass protostar NGC1333-IRAS2A

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Table 3

Comparison of HDO fractional abundance between NGC 1333-IRAS2A and IRAS 16293–2422.

Source	Best fit		Confidence interval (3σ)				^b	^b

					Inner	outer (3σ)	–	–

IRAS2A^a	8 × 10^-8	7 × 10^-10	6.6 × 10^-8–1.0 × 10^-7	9 × 10^-11–1.8 × 10^-9	≥0.01^c	0.07	0.17	0.62
IRAS 16293^d	1 × 10^-7	1.5 × 10^-10	7 × 10^-8–1.3 × 10^-7	≤1.0 × 10^-9	0.03	≤0.002	0.15 ± 0.07	0.37

Orion KL	...	...	...	...	0.02^e		0.14^f	0.04^g

Notes.

^(a)

The HDO fractional abundance was derived with M = 0.07 M_⊙.

^(b)

Parise et al. (2006).

^(c)

The fractional abundances of water taken here are 1 × 10^-5 and , as constrained by Visser et al. in prep. from the 1₁₁−0₀₀, 202−111, and 2₁₁−2₀₂ HO lines and the upper-limit on the 1₁₁−0₀₀ HO line presented in Kristensen et al. (2010).

^(d)

Parise et al. (2005a).

^(e)

Bergin et al. (2010).

^(f)

Turner (1990).

^(g)

Jacq et al. (1993).

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