The effects of spherical extension upon the photospheric structure and spectrum of red giants - Comparison of M and C stars

Details The effects of spherical extension upon the photospheric structure and spectrum of red giants - Comparison of M and C stars The effects of spherical extension upon the photospheric structure and spectrum of red giants - Comparison of M and C stars

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...130...11s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 130, no. 1, Jan. 1984, p. 11-18. Sponsorship: Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

45

Carbon Stars, M Stars, Photosphere, Red Giant Stars, Stellar Atmospheres, Stellar Structure, Opacity, Stellar Models, Stellar Spectra

Scientific paper

Since carbon stars tend to be cooler and more luminous than M giant stars (Tsuji, 1981), they are expected to manifest stronger sphericity effects than M stars of similar masses. However, the investigation presented here shows that there is an opposite surface opacity effect, increasing with decreasing effective temperature; this makes sphericities and sphericity effects smaller for cool C stars than for M stars with the same parameters (L, M, effective T). At present, it is not clear whether this surface opacity effect survives if polyatomic molecule absorption in the upper layers of C type photospheres is taken into account more completely than in the study here. It is stressed that absorption line depths are especially sensitive to the surface temperature decrease caused by sphericity; their interpretation through compact model photospheres must therefore be regarded with caution for stars with unknown luminosities and masses.

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