On the occurrence of alkaline earth and rare earth oxides in sunspots and cool stars

Details On the occurrence of alkaline earth and rare earth oxides in sunspots and cool stars On the occurrence of alkaline earth and rare earth oxides in sunspots and cool stars

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....68..381d&link_type=abstract

Astronomy and Astrophysics, vol. 68, no. 3, Aug. 1978, p. 381-387.

Astronomy and Astrophysics

Astrophysics

4

Alkaline Earth Metals, Cool Stars, Metal Oxides, Rare Earth Elements, Stellar Atmospheres, Sunspots, Abundance, Dissociation, Spectral Line Width, Stellar Temperature

Scientific paper

Since only 12 metal oxides have been identified with certainty in cool stellar atmospheres and sunspots, the failure to detect more is explained on the basis of metal abundances, equilibrium constants, and dissociation energies. Recently determined experimental dissociation energies are used for these considerations. It is shown that only in stars with a reversing-layer temperature of no more than 3000 K the spectra of some of the metal oxides considered can be detected in the visible at an equivalent width of more than 1 mA.

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