Perhaps the oxygen-poor star M 13 II67 isn't oxygen poor after all

Details Perhaps the oxygen-poor star M 13 II67 isn't oxygen poor after all Perhaps the oxygen-poor star M 13 II67 isn't oxygen poor after all

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103..177l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, Feb. 1991, p. 177-184.

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20

Giant Stars, Globular Clusters, M Stars, Oxygen, Absorption Spectra, Abundance, Emission Spectra, Peculiar Stars, Spectral Line Width, Stellar Atmospheres

Scientific paper

The paper explores the possibility that the forbidden O I 6300-A absorption lines are abnormally weak in the spectra of some brigth globular-cluster giants (like M 13 II67) because they are 'filled in' by forbidden O I emission from an extensive, cool, slowly expanding outer envelope. The results are promising. A very simple one-zone model shows that an H I region with a radius of about 30 AU can provide the supposed emission. The model leads to a mass-loss rate about five times larger than the Reimers 1975 formula predicts and suggests why the average observed value of O/Fe drops near the tip of the giant branch. Absorption in the putative expanding atmosphere qualitatively accounts for the blueshifted Na D line cores that have been observed in the spectra of M 13 II67 and some other bright cluster giants.

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