Abstract
It is now generally agreed that the atmospheres of luminous M stars have geometrical extensions (defined by d=R (τ=10=-4) /R (τ=1) -1) which are no longer negligible compared to the stellar radius. It has also been shown that the actual degree of extension depends strongly on the composition (Wehrse, 1981).
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Reference
Wehrse, R., 1981, Mon. Not. R. astr. Soc. 195, 553
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© 1985 D. Reidel Publishing Company, Dordrecht, Holland
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Wehrse, R. (1985). Model Atmospheres for M (Super-) Giants with Different Abundances of the Heavy Metals and the CNO Group. In: Jaschek, M., Keenan, P.C. (eds) Cool Stars with Excesses of Heavy Elements. Astrophysics and Space Science Library, vol 114. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5325-3_37
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DOI: https://doi.org/10.1007/978-94-009-5325-3_37
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