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A Search for Rotationally Modulated Hα Variability in OB Supergiants

Published online by Cambridge University Press:  26 May 2016

T. Morel ,
S. V. Marchenko ,
A. K. Pati ,
K. Kuppuswamy ,
M. T. Carini ,
E. Wood  and
R. Zimmerman
T. Morel
Affiliation:
Osservatorio Astronomico di Palermo, Italy Inter-University Centre for Astronomy and Astrophysics, Pune, India
S. V. Marchenko
Affiliation:
Western Kentucky University, Bowling Green, USA
A. K. Pati
Affiliation:
Indian Institute of Astrophysics (IIAP), Bangalore, India
K. Kuppuswamy
Affiliation:
Indian Institute of Astrophysics (IIAP), Bangalore, India
M. T. Carini
Affiliation:
Western Kentucky University, Bowling Green, USA
E. Wood
Affiliation:
Western Kentucky University, Bowling Green, USA
R. Zimmerman
Affiliation:
Western Kentucky University, Bowling Green, USA

Abstract

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We present preliminary results of a long-term spectroscopic monitoring of a magnitude-limited (V < 7.5) sample of OB-supergiants (07.5-B9) 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. Dramatic line-profile variations operating on a daily (and in some cases on a hourly) timescale are observed. Firm conclusions regarding the origin of the variability must, however, await a detailed period analysis. There is no clear evidence for a causal link between photospheric and wind activities.

Type
Session 1 Observations of Rotating Stars
Information
Symposium - International Astronomical Union , Volume 215: Stellar Rotation , 2004 , pp. 45 - 46
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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