Wind Variability in Intermediate Luminosity B Supergiants

Details Wind Variability in Intermediate Luminosity B Supergiants Wind Variability in Intermediate Luminosity B Supergiants

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996arc..rept.....m&link_type=abstract

Technical Report, Applied Research Corp. Landover, MD United States

Physics

Supergiant Stars, Stellar Winds, Wind Profiles, Time Series Analysis, Photosphere, B Stars, Stellar Luminosity, Variability, Ionization, Iue, Stellar Rotation, Spectroscopy, Abundance, Ultraviolet Spectra, Optical Thickness, Silicon, Spectroscopic Analysis

Scientific paper

This study used the unique spectroscopic diagnostics of intermediate luminosity B supergiants to determine the ubiquity and nature of wind variability. Specifically, (1) A detailed analysis of HD 64760 demonstrated massive ejections into its wind, provided the first clear demonstration of a 'photospheric connection' and ionization shifts in a stellar wind; (2) The international 'IUE MEGA campaign' obtained unprecedented temporal coverage of wind variability in rapidly rotating stars and demonstrated regularly repeating wind features originating in the photosphere; (3) A detailed analysis of wind variability in the rapidly rotating B1 Ib, gamma Ara demonstrated a two component wind with distinctly different mean states at different epochs; (4) A follow-on campaign to the MEGA project to study slowly rotating stars was organized and deemed a key project by ESA/NASA, and will obtain 30 days of IUE observations in May-June 1996; and (5) A global survey of archival IUE time series identified recurring spectroscopic signatures, identified with different physical phenomena. Items 4 and 5 above are still in progress and will be completed this summer in collaboration with Raman Prinja at University College, London.

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