Extended static stellar atmospheres. V - Photospheres of luminous M stars

Details Extended static stellar atmospheres. V - Photospheres of luminous M stars Extended static stellar atmospheres. V - Photospheres of luminous M stars

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.194..383s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 194, Feb. 1981, p. 383-396. Deutsche Forschungsgemeinschaft

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39

M Stars, Photosphere, Stellar Atmospheres, Stellar Luminosity, Late Stars, Stellar Models, Stellar Temperature, Supergiant Stars

Scientific paper

Model photospheres with parameters typical of late M giants and supergiants have noticeably lower surface temperatures if they are computed as extended instead of plane-stratified. The behavior of temperature, gas pressure, partial pressures of important molecules, and selected spectral features are discussed. Due to the strong temperature dependence of molecule formation, the extension effects are hardly predictable without detailed computations. The photospheres of M stars with masses near 1 solar mass and luminosities of the order of 1000 or more solar luminosities must definitely be treated as extended. The large uncertainties inherent in the present state of M star model construction are discussed.

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