THE DISTANCE TO THE WN8 STAR WE21.
A high-resolution spectrum of the interstellar Na D lines towards We 21 shows a total velocity extent of about 95 km s-1, extending from -65 to +30 km s-1 in the LSR velocity frame. In this line-of-sight the positive velocities can only arise from beyond the solar circle, and this suggests that We 21 lies in the far part of the Carina spiral arm, at a distance of about 11.5 kpc. Contrary to the conclusions of Duerbeck & Reipurth (1990), We 21 appears to be a massive Population I WN8 star surrounded by a stellar ejecta bubble, and not a PN central star.
|Title:||THE DISTANCE TO THE WN8 STAR WE21|
|Keywords:||INTERSTELLAR MEDIUM, SPECTROSCOPY, PLANETARY NEBULAE, GENERAL, STARS, WOLF-RAYET, WOLF-RAYET STARS, MOLECULAR CLOUDS, CARINA ARM, MILKY-WAY, COALSACK, NEBULAE|
|UCL classification:||UCL > School of BEAMS > Faculty of Maths and Physical Sciences
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy
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