The ultimate lines of rubidium have been detected in the sunspot spectrum,[328] but they are not found in the spectra of the sun or stars.
STRONTIUM (38)
The element strontium is of great astrophysical importance, owing to the use of its enhanced lines in the estimation of absolute magnitudes. The neutral atom is represented in the sun and stars by the ultimate line (
) 4607, which is first clearly seen[329] at
, and increases progressively in strength with advancing type. It varies with absolute magnitude, being weakened in stars of high luminosity later than
. Estimates for the intensity of this line are difficult with small dispersions, as it is blended in cool stars.
IONIZED STRONTIUM