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Terminal Velocities for a Large Sample of O Stars, B Supergiants, and Wolf-Rayet Stars

PRINJA, RK; BARLOW, MJ; HOWARTH, ID; (1990) Terminal Velocities for a Large Sample of O Stars, B Supergiants, and Wolf-Rayet Stars. Astrophysical Journal , 361 pp. 607-620. 10.1086/169224. Green open access

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Abstract

It is argued that easily measured, reliable estimates of terminal velocities for early-type stars are provided by the central velocity asymptotically approached by narrow absorption features and by the violet limit of zero residual intensity in saturated P Cygni profiles. These estimators are used to determine terminal velocities, v(infinity), for 181 O stars, 70 early B supergiants, and 35 Wolf-Rayet stars. For OB stars, the values are typically 15-20 percent smaller than the extreme violet edge velocities, v(edge), while for WR stars v(infinity) = 0.76 v(edge) on average. New mass-loss rates for WR stars which are thermal radio emitters are given, taking into account the new terminal velocities and recent revisions to estimates of distances and to the mean nuclear mass per electron. The relationships between v(infinity), the surface escape velocities, and effective temperatures are examined.

Type: Article
Title: Terminal Velocities for a Large Sample of O Stars, B Supergiants, and Wolf-Rayet Stars
Open access status: An open access version is available from UCL Discovery
DOI: 10.1086/169224
Publisher version: https://doi.org/10.1086/169224
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: Science & Technology, Physical Sciences, Astronomy & Astrophysics
UCL classification: UCL
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/10096215
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