Other
Scientific paper
May 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230..156s&link_type=abstract
Astrophysical Journal, Part 1, vol. 230, May 15, 1979, p. 156-161.
Other
15
B Stars, Photosphere, Stellar Atmospheres, Stellar Mass Ejection, Stellar Winds, Ultraviolet Spectra, Chromosphere, Convective Heat Transfer, Flow Velocity, Frequency Shift, Hot Stars, Line Spectra, Mass Transfer, Oao 3, Radial Velocity, Stellar Coronas
Scientific paper
From analysis of weak, unblended, ultraviolet lines observed in Tau Scorpii by Copernicus, the same line widths and the same slightly blue-depressed wings as found in the upper photospheric lines of the visual region are found. In addition, a radial-velocity discrepancy of about 6 km/s between weak and strong lines in the 1000-1300-A region is found. These results are in quantitative agreement with one another and with the results of the visual region. They imply that a flow of material is present even in the deep photosphere of this star. However, one cannot yet specify the geometry of the flow (outward-radial versus temperature-weighted convection columns). At the least, this flow alters the expected radiation-driven flow solution close to the photosphere. At the most, it could provide the heating of a chromosphere or a corona just outside the photosphere, as required by the imperfect flow model.
Karp Alan H.
Smith Matthew A.
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