Other
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223l..37s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 223, July 1, 1978, p. L37-L39.
Other
71
Giant Stars, Late Stars, Stellar Atmospheres, Stellar Evolution, Stellar Mass Ejection, Stellar Spectra, Calcium, G Stars, Histograms, K Stars, Line Spectra, Stellar Luminosity, Supergiant Stars
Scientific paper
High-dispersion coude spectrograms of 181 MK standards of types early F through late M, including luminosity classes Ia, Ib, II, and III, are analyzed. It is shown that the brightness ratio of the V and R self-reversed emission peaks (denoted V/R) in the center of the Ca II K line is correlated with spectral type as well as with certain other spectral-type and luminosity-sensitive parameters, including indicators of mass loss and the H-K wing emission lines. The observations indicate that V/R varies smoothly from less than unity in late K and M giants to greater than unity for G giants. This trend appears to be true for bright giants as well but not necessarily for supergiants and seems to hold for the average V/R for a given star, although short-term variations in V/R occur. It is suggested that the V/R values, which can be interpreted in terms of atmospheric motions, may indirectly relate to effects of evolutionary changes in stellar structure and that V/R among late-type stars could be useful as an indicator of both chromospheric activity and the state of stellar evolution.
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