Long term variability of B supergiant winds

Details Long term variability of B supergiant winds Long term variability of B supergiant winds

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995arcl.rept.....m&link_type=abstract

Final Report Applied Research Corp., Landover, MD.

Computer Science

B Stars, Binary Stars, Stellar Spectra, Stellar Winds, Wind Variations, Cygnus Constellation, Interstellar Matter, Optical Polarization, Pre-Main Sequence Stars, Stellar Envelopes

Scientific paper

The object of this observing proposal was to sample wind variability in B supergiants on a daily basis over a period of several days in order to determine the time scale with which density variability occurs in their winds. Three stars were selected for this project: 69 Cyg (B0 Ib), HD 164402 (B0 Ib), and HD 47240 (B1 Ib). Three grey scale representations of the Si IV lambda lambda 1400 doublet in each star are attached. In these figures, time (in days) increases upward, and the wavelength (in terms of velocity relative to the rest wavelength of the violet component of the doublet) is the abscissa. The spectra are normalized by a minimum absorption (maximum flux) template, so that all changes appear as absorptions. As a result of these observations, we can now state with some certainty that typical B supergiants develop significant wind inhomogeneities with recurrence times of a few days, and that some of these events show signs of strong temporal coherence.

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