ON THE DISTANCE TO M1-67.
518 - 520.
The interstellar Na I D2 absorption spectrum of 209 BAC, the WN 8 central star of M 1-67, shows a total velocity extent of 60 km s-1. This is consistent with the spread of gas velocities expected from galactic rotation, provided 209 BAC is at a distance of 4-5 kpc, implying that it is a massive Population I WN 8 star surrounded by a stellar ejecta nebula. If M 1-67 was a planetary nebula at a distance of only 0.5-1 kpc, the velocity extent of the Na I absorption line should be 5-6 times smaller than that observed. We suggest that similar observations should be obtained of We 21, recently discovered by Duerbeck & Reipurth to be a WN 8 star in a ring-like nebula.
|Title:||ON THE DISTANCE TO M1-67|
|Keywords:||INTERSTELLAR MEDIUM, BUBBLES, SHELLS, SPECTROSCOPY, PLANETARY NEBULAE, GENERAL, STARS, WOLF-RAYET, WOLF-RAYET STARS, NEBULAE|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy|
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