CA II emission from old red giants in the globular cluster M15

Details CA II emission from old red giants in the globular cluster M15 CA II emission from old red giants in the globular cluster M15

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.354..284d&link_type=abstract

Nature (ISSN 0028-0836), vol. 354, Nov. 28, 1991, p. 284-286.

Physics

4

Calcium, Emission Spectra, Globular Clusters, Red Giant Stars, Spectral Line Width, Binary Stars, Chromosphere, H Alpha Line, Stellar Spectra

Scientific paper

Murphy et al. (1991) observed characteristic emission of Ca II from the globular cluster M15 and argued that this emission came from a population of primordial binary stars. It is argued here, however, that the Ca II K-line emission in various types of hard binary systems differs in strength and width from the M15 spectra, and it is demonstrated that the M15 emission closely resembles that from metal-deficient red giants of the halo population in the Galaxy. Chromospheric activity, indicated by emission in Ca II, H-alpha, and Mg II, occurs in red giants in both globular clusters and halo-population field giants. A simple detection of Ca II emission is thus not a unique signature of binaries, and in the case of M15 it is argued that red giants are the more likely cause.

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