Nitrogen line spectroscopy in O-stars - III. The earliest O-stars

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Volume 543 (July 2012)

A&A, 543 (2012) A95

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Table 6

Observed and predicted line-strength ratios for N iv/N iii and N v/N iv, for the O2-O4 stars analyzed within this work.

Star	#	SpT	T_eff							Comments
			(kK)	obs		model	obs		model

BI253	1	O2 V((f^∗))	54.8	0.67	± 0.15	1.85	0.53	± 0.23	0.43	N iiiλ4640 and N ivλ4058 underpredicted^a
BI237	2	O2 V((f^∗))	53.2	0.59	± 0.14	1.58	0.36	± 0.14	0.21	N iiiλ4640 underpredicted^a
N11-060	3	O3 V((f^∗))	48.0	0.08	± 0.02	−0.03	−0.07	± 0.03	−0.30	N ivλ4058 and N vλ4603 underpredicted^a^b
AV 435	4	O3 V((f^∗))	46.0	0.01	± 0.18	−0.03	< − 0.30	( + 0.10)	−0.46	N vλ4603 diluted in noise
LH 81:W28-23	5	O3.5 V((f+))	47.0	−0.16	± 0.04	0.09	−0.01	± 0.05	−0.18	N iiiλ4640 underpredicted
LH 101:W3-24	6	O3.5 V((f+))	47.0	< − 0.20	( + 0.12)	−0.12	<−0.28	(+0.14)	−0.38	N iiiλ4640 underpredicted
LH 81:W28-5	7	O4 V((f+))	44.0	−0.66	± 0.10	−0.55	−0.53	± 0.13	−0.60	Satisfactory fits
AV 177	8	O4 V((f))	44.0	<−0.26	(+0.13)	−0.34	<−0.36	( + 0.09)	−0.57	Only N iiiλ4640 and N ivλ6380 visible
NGC 346-355	9	ON2 III(f^∗)	53.0	0.91	± 0.09	1.33	0.19	± 0.04	0.21	N iiiλ4640, N ivλ4058, N vλ4603 underpred.^c
N11-026	10	O2 III(f^∗)	49.0	0.54	± 0.06	0.73	0.14	± 0.02	−0.08	N iiiλ4640, N ivλ4058, N vλ4603 underpred.^a,b
R136-018	11	O3 III(f^∗)	47.0	>+0.22	(−0.21)	−0.18	>−0.20	(−0.13)	−0.32	N iiiλ4640 and N ivλ4058 underpredicted
LH 90:ST 2-22	12	O3.5 III(f+)	44.0	−0.18	± 0.06	−0.13	−0.20	± 0.04	−0.39	Satisfactory fits
Sk–67° 22	13	O2 If^∗/WN5	46.0	0.87	± 0.14	1.04	0.35	± 0.03	0.31	N vλ4603 under, N ivλ4058 overpredicted
LH 101:W3-19	14	O2 If^∗	44.0	0.40	± 0.07	0.41	0.05	± 0.14	0.00	N vλ4603 overpredicted
Sk–65° 47	15	O4 If	40.5	−0.19	±0.12	0.23	<−0.38	(+0.08)	−0.52	N ivλ4058 overpredicted

Notes. Errors in brackets provide uncertainties of lower or upper limits. Predicted line ratios (“model”) drawn from best-fitting synthetic spectra. N11-031 and R136-040 discarded, see text. Observed ratios (or limits) inclusive errors. Numbers refer to Figs. 13 and 14.

^(a)

For fits, see Paper II, Appendix C;

^(b)

Compromise solution, see Paper II;

^(c)

“Average” solution.

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