On the distance to M1 - 67

Details On the distance to M1 - 67 On the distance to M1 - 67

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..518c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. 518-520.

Astronomy and Astrophysics

Astrophysics

25

Distance, Gas Dynamics, Interstellar Gas, Planetary Nebulae, Wolf-Rayet Stars, Absorption Spectra, Galactic Rotation, Radial Velocity, Stellar Mass Ejection

Scientific paper

The interstellar Na I D2 absorption spectrum of 209 BAC, the WN 8 central star of M1 - 67, shows a total velocity extent of 60 km/s. 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 M1 - 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. It is suggested that similar observations should be obtained of We 21, recently discovered by Duerbeck and Reipurth (1990) to be a WN 8 star in a ringlike nebula.

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