Hostname: page-component-848d4c4894-hfldf Total loading time: 0 Render date: 2024-05-14T11:04:45.451Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

Cranmer, S. R., Owocki, S. P. 1996, ApJ 462, 469 CrossRefGoogle Scholar
Ebbets, D. 1982, ApJS 48, 399 Google Scholar
Fullerton, A. W., Gies, D. R., Bolton, C. T. 1996, ApJS 103, 475 Google Scholar
Kaper, L., et al. 1997, A&A 327, 281 Google Scholar