Some aspects of the spectroscopic behavior of the stars of highest luminosity in the region of the Hertzsprung gap

Details Some aspects of the spectroscopic behavior of the stars of highest luminosity in the region of the Hertzsprung gap Some aspects of the spectroscopic behavior of the stars of highest luminosity in the region of the Hertzsprung gap

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243..894m&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Feb. 1, 1981, p. 894-899. NSF-supported research.

Mathematics

Logic

9

Hertzsprung-Russell Diagram, Stellar Spectra, Supergiant Stars, Classifications, Stellar Spectrophotometry

Scientific paper

The classification of the stars of highest luminosity in the spectral range GO-KO is discussed. The method of pattern recognition is applied to certain configurations of lines and blends in the region λλ4100-48O0. One of the most sensitive of these patterns makes possible the separation of the two brightest luminosity classes (zero, 0-Ia) from the general category of Ia stars in the range G8-K0; this pattern should be usable on objective prism plates.
The two brightest luminosity classes (zero, 0-Ia) comprise stars probably undergoing the most intense mass loss in the spectral interval F8-K0, and those showing the most marked irregular spectral variations; this latter characteristic makes difficult the assignment of accurate MK spectral types. The most trustworthy morphological information seems to be derivable from the approach in which spectrograms of several of the super-supergiants are confronted with the F8-K2 fundamental Ib standards. From such a confrontation, valid statements can be made concerning the differential classification of members of the super-supergiant group as well as their relationship to the Ib sequence.

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