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On the distance to M1-67

CRAWFORD, IA; BARLOW, MJ; (1991) On the distance to M1-67. Astronomy & Astrophysics , 249 (2) pp. 518-520. Green open access

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Abstract

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.

Type: Article
Title: On the distance to M1-67
Open access status: An open access version is available from UCL Discovery
Publisher version: https://ui.adsabs.harvard.edu/abs/1991A%26A...249....
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Distance; Gas Dynamics; Interstellar Gas; Planetary Nebulae; Wolf-Rayet Stars; Absorption Spectra; Galactic Rotation; Radial Velocity; Stellar Mass Ejection; Astrophysics
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10096208
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