Neutral oxygen spectral line formation revisited with new collisional data: large departures from LTE at low metallicity

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Volume 500 / No 3 (June IV 2009)

A&A, 500 3 (2009) 1221-1238

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Table 1:

Results (for the strongest triplet line at 777.2 nm) obtained using our 54-level atomic model. The non-LTE and LTE equivalent widths are given to show the sensitivity to various mechanisms.
	$W_{\rm non-LTE}$	$W_{\rm LTE}$
	[mÅ]	[mÅ]
$S_{\rm H}={\bf0}$
standard case	14.2	2.9
[Fe/H] =-3.5	10.9	1.0
$\log~\epsilon_{\rm O}=6.0$	6.3	1.0
$S_{\rm H}={\bf 1}$
standard case	6.7	2.9
[Fe/H] =-3.5	4.2	1.0
$\log~\epsilon_{\rm O}=6.0$	2.9	1.0
no 130 nm O I lines	3.9	2.9
no 130 nm, no 136 nm O I lines	3.6	2.9
3s-3s Barklem e^-	7.2	2.9
all Barklem e^- but 3s-3s	6.5	2.9
no 3s-3s coupling	5.2	2.9
old e^- collisions	6.2	2.9
old e^- collisions, 3s-3s Barklem e^-	6.4	2.9
old e^- collisions, no O+H 3s-3s	5.0	2.9
no UV background line opacity	7.8	2.9
no H Ly- $\beta$ opacity	6.8	2.9
Si*0.1	9.4	2.9

Source LaTeX | All tables | In the text

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