Chemical enrichment and physical conditions in I Zw 18

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Table 9

Mass estimates of elements locked in dust.

Element	m_g(X)^a	Δm^b
	(M_⊙)	(M_⊙)


C		357−776
N		59−86
O_S		0−2100
Al		46−56
Si		210−450
P		0.4−3.4
S		33−95
Cl	<4.7	<4.4
Fe		0−275

Notes.

^(a)

Mass of element in the gas phase of the H i region (observed).

^(b)

Mass required in dust to reach the H ii region abundance, i.e., δ_H i(X) = 0. For Al, P, and Cl, for which there is no H ii region reference, we provide the mass required to reach the metallicity calculated from O, [X/H] = −1.64.

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