Observations of red variable stars in globular clusters

Details Observations of red variable stars in globular clusters Observations of red variable stars in globular clusters

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.204..961e&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 204, Sept. 1983, p. 961-973.

Astronomy and Astrophysics

Astronomy

22

Emission Spectra, Globular Clusters, H Lines, Red Giant Stars, Stellar Spectrophotometry, Variable Stars, Absorption Spectra, Abundance, Mira Variables, Ultraviolet Spectra

Scientific paper

Although variable stars often exhibit H emission lines, extensive observations of line strengths in the spectra of variable and constant stars in globular clusters indicate that the H lines in variables of small amplitude often show stronger absorption than typical nonvariable stars. Strong H emission is also found in the Mira variables of the more metal-deficient clusters, and is often accompanied by such variables' weakening of strong neutral metal lines. The periods of Mira variables in globular clusters are well correlated with the traditional abundance criteria, but not with the abundances derived from high dispersion spectra.

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