Simulating the circumstellar H2CO and CH3OH chemistry of young stellar objects using a spherical physical-chemical model

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Table 5

Results of robustness test for object age using an age variation ±30% to estimate column density uncertainties for H₂CO and CH₃OH.

Molecule/	N(X)_total	(X)	(X)
source		(r_start − r_end)	(θ_mb = 25′′)
	[10⁴⁷ #]	[10¹³ cm⁻²]	[10¹³ cm⁻²]
H₂CO
R CrA-IRS 5A	5.4	4.4	6.1

NGC 1333-IRAS 2A	77	18	24

L1551-IRS 5	13	4.5	5.9

L1544	21	4.6	6.8

CH₃OH
R CrA-IRS 5A	3.5	2.8	3.7

NGC 1333-IRAS 2A	210	50	60

L1551-IRS 5	9.9	3.4	3.9

L1544	8.8_(−6.7)	2.0_(−1.5)	2.9_(−2.2)

Notes. Setting B has been used; see Table 2 for details. The calculations are based on a gradient density and temperature distribution;see Table 3. The given uncertainties are based on the assumption that the true age can vary by ±30% of the given age listed in Table 1.

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