Wind and nebula of the M 33 variable GR 290 (WR/LBV)

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Table 6.

Heliocentric radial velocities of nebular lines (km s⁻¹), August spectrum.

Position:	1	2	3
Line	GR 290	M 33-back	OB89
[S II] 6716.44	…	−208	−223
[S II] 6730.82	…	…	−226
[N II] 6548.01	−188	−147:	−180:^a
[N II] 6583.45	−189	−233	−211
Hα 6562.83	−179	−194	−200
[O III] 4958.90	−206	…	…
[O III] 5006.84	−201^b	…	…

Notes.

^(a)

The [N II] 6548 Å line is significantly weaker than [N II] 6583 and is partially blended with the Hα emission line. For this reason, we consider this measurement to have a larger uncertainty in RV than the rest, which is indicated with a colon (:) in the table;

^(b)

[O III] 5007 was measured on the one-dimensional spectrum with a three-Gaussian fit to correct for the presence of the neighbouring He I 5015 Å line whose P Cyg absorption component overlaps its red wing.

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