The distance to the WN8 star We 21

Details The distance to the WN8 star We 21 The distance to the WN8 star We 21

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251l..39c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. L39-L42.

Astronomy and Astrophysics

Astrophysics

12

Astronomical Spectroscopy, Interstellar Matter, Planetary Nebulae, Wolf-Rayet Stars, Distance, Line Spectra, Radial Velocity, Stellar Spectra

Scientific paper

A high-resolution spectrum of the interstellar Na D lines toward We 21 shows a total velocity extent of about 95 km/s, extending from -65 to +30 km/s in the LSR velocity frame. In this line-of-sight the positive velocities can arise only 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 and 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.

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