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20. The violet and ultra-violet regions of the spectra of The N-type stars
Published online by Cambridge University Press: 02 August 2017
Extract
The violet and ultra-violet regions of the spectra of the cool carbon stars are notoriously difficult to photograph. This is so particularly for the late N-type stars with which the present paper deals. The spectra of R-type and early N-type stars can be photographed down to ƛ3500 by exposures several times as long as for M-type stars of comparable class. However, the later N-type spectra fall so rapidly in intensity from ƛ4400 and so even more extremely from ƛ4100 to shorter wave-lengths that the spectra of the brightest stars have not been recorded below ƛ3900.
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- Part IV Symposia
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- Copyright © Cambridge University Press 1954