Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200...41s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 200, July 1982, p. 41-47. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astronomy
18
M Stars, Photosphere, Stellar Atmospheres, Stellar Luminosity, Stellar Models, Stellar Spectra, Atmospheric Models, Hertzsprung-Russell Diagram, Stellar Temperature, Titanium Oxides
Scientific paper
A three-dimensional classification scheme for middle to late M stars having normal surface compositions can be defined by means of such conventional classification criteria as continuous fluxes, metal ion lines, and TiO bands. In addition to measuring effective temperature and surface gravity, this classification measures geometric extension as a third fundamental photospheric parameter. The dependence of the TiO bands on photospheric extension is demonstrated by a TiO color index that is constructed as a function of the photospheric extension at effective temperatures of 3000 and 2750 K.
Scholz Marek
Wehrse Rainer
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