[en] In 2000-2001 we performed long-term spectroscopic monitoring of a sample of bright OB-supergiants aimed at establishing the incidence of co-rotating, large-scale wind structures. In the optical, this can be achieved by detecting rotationally modulated variability in Hα . Practically all the surveyed stars show dramatic line-profile variations operating on a daily (and in some cases on a hourly) timescale. Here we discuss the case of HD 14134 (B3 Ia) where a periodic modulation seen in the optical continuum (stellar surface, P=12.825d) triggers spectacular variations in the Hα emission line (stellar wind).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Morel, Thierry ; Osservatorio Astronomico di Palermo G. S. Vaiana, Istituto Nazionale di Astrofisica
Marchenko, S. V.; Western Kentucky University
Pati, A. K.; Indian Institute of Astrophysics (IIAP), Bangalore, India
Kuppuswamy, K.; Vainu Bappu Observatory, Indian Institute of Astrophysics (IIAP), India
Carini, M. T.; Western Kentucky University
Wood, E.; Western Kentucky University
Zimmerman, R.; Western Kentucky University
Language :
English
Title :
Large-Scale Structures in OB Supergiants: from an Inhomogeneous Surface to a Structured Wind
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