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Towards an Understanding of the Of?p star HD 191612: Optical Spectroscopy
Howarth, I. D.; Walborn, N. R.; Lennon, D. J. et al.
2008In Revista Mexicana de Astronomia y Astrofisica Conference Series
 

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Keywords :
HII regions; ISM: jets and outflows; stars: pre-main sequence; stars: mass loss
Abstract :
[en] We have acquired extensive optical spectroscopy of the early-type magnetic star HD 191612 (O6.5f?pe-O8fp). The Balmer and HeI lines show strongly variable emission which is extremely reproducible on a well-determined 538-d period. Metal lines and HeII absorptions (including many selective emission lines, but excluding HeII lambda 4686 Å emission) are nearly constant in line strength, but are variable in velocity. The radial-velocity variations establish a double-lined binary orbit with P_{orb} = 1542d, e = 0.44; by elimination, rotational modulation of a magnetically constrained plasma is left as by far the most likely `clock' underlying the 538-d changes. The implied rotation period shows that slow rotators can easily be hidden in the O-star population, with gaussian-like `turbulence' dominating the line widths.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Howarth, I. D.;  Dept. Physics & Astronomy, University College London, Gower St., London WC1E 6BT, UK (idh@star.ucl.ac.uk).
Walborn, N. R.
Lennon, D. J.
Puls, J.
Nazé, Yaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Sciences spatiales
Language :
English
Title :
Towards an Understanding of the Of?p star HD 191612: Optical Spectroscopy
Publication date :
01 August 2008
Audience :
International
Main work title :
Revista Mexicana de Astronomia y Astrofisica Conference Series
Pages :
120-120
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