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Some Remarks on Supergiant Photospheres

C. De Jager
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences
Vol. 279, No. 1289, A Discussion on Astronomy in the Ultraviolet (Jul. 31, 1975), pp. 421-427
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/74391
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Some Remarks on Supergiant Photospheres
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Abstract

Some characteristic aspects of near ultraviolet spectra of supergiant stars, observed with the Utrecht ultraviolet stellar spectrometer S59 aboard E.S.R.O.'s TD1A satellite are described. A comparison of the observed maximum brightness of supergiants with theoretical computation shows that in the brightest early-type supergiants the outward driving forces due to radiation pressure and to the turbulent pressure gradient must be about equal.

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