Multilayer modeling of porous grain surface chemistry - I. The GRAINOBLE model

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Table 5

Mantle abundances of CO and CH₃OH with respect to water along with the relative CH₃OH/CO abundance ratio, as observed towards low – (LM), intermediate – (IM), and high-mass (HM) protostars.

Source	X(CO)	X(CH₃OH)	X(CH₃OH)
	% wrt H₂O	% wrt H₂O	% wrt to CO

Low-Mass
L1448 IRS 1	45.5^a^b^c^d^e	<14.9^d	<32.7
L1455 SMM 1	5.6^a^b^c^d^e	<13.5^d	<241.1
RNO 15	13.6^a^b^c^d^e	<5.0^d	<36.8
IRAS 03254	13.6^a^b^c^d^e	<4.6^d	<33.8
IRAS 03271	8.2^a^b^c^d^e	<5.6^d	<68.3
B1-a	13^a^b^c^d^e	<1.9^d	<14.6
B1-c	28.6^a^b^c^d^e	<7.1^d	<24.8
L1489	15.2^a^b^c^d^e	4.9^d	32.3
DG Tau B	20.5^a^b^c^d^e	<5.7^d	<27.8
IRAS 12553	12.6^a^b^c^d^e	<3.0^d	<23.8
IRAS 13546	22.7^a^b^c^d^e	<3.9^d	<17.2
IRAS 15398	40.3^a^b^c^d^e	10.3^d	25.6
CRBR 2422.8-3423	11.2^a^b^c^d^e	<9.3^d	<83.0
RNO 91	19.0^a^b^c^d^e	<5.6^d	<29.5
IRAS 23238	4.0^a^b^c^d^e	<3.6^d	90.0

Intermediate-Mass
AFGL989	19.0^b	1.7^b	8.9
SMM4	30.0^c	28.0^c	93.3

High-Mass
W33A	7.4^a^b^c^d^e	14.7 ^d	198.6
GL 2136	10.2^a^b^c^d^e	8.5^d	83.3
S140	16.6^a^b^c^d^e	<3.0^d	<18.1
NGC 7538 IRS 9	16.5^a^b^c^d^e	7.5^d	45.5
AFGL2136	5.0^b	5.0 ^b	100.0
AFGL7009	16.0^b	33.0^b	206.3

References.

^(a)

Pontoppidan et al. (2003);

^(b)

Gibb et al. (2004);

^(c)

Pontoppidan et al. (2004);

^(d)

Boogert et al. (2008);

^(e)

Pontoppidan et al. (2008).

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