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Long term variability of B supergiant windsThe 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.
Document ID
19950016981
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Massa, Derck L. (Applied Research Corp. Landover, MD, United States)
Date Acquired
September 6, 2013
Publication Date
January 18, 1995
Subject Category
Astronomy
Report/Patent Number
NAS 1.26:197925
ARC-R-95-229
NASA-CR-197925
Accession Number
95N23401
Funding Number(s)
CONTRACT_GRANT: NASA ORDER S-14634-F
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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