Mass Loss from Red Giants in Second-Parameter Globular Clusters

Details Mass Loss from Red Giants in Second-Parameter Globular Clusters Mass Loss from Red Giants in Second-Parameter Globular Clusters

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003noao.prop..186a&link_type=abstract

NOAO Proposal ID #2003A-0186

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Scientific paper

We have made the first measurements of the mass-loss rates of red giants in "second parameter" globular clusters (GCs), M3 and M13, using Keck/LWS. These clusters have nearly identical metallicities, but different horizontal branch colors. A comparison of the N-band (10 micron) fluxes of the stars in these GCs will establish whether mass loss is the second parameter. To improve experimental statistics, we propose to observe red giants in M10 and M12, both of which are similar to M13. Repeat measurements from Keck/LWS and Gemini/Michelle will provide a check on possible instrumental systematic error and improve photometric accuracy for a subset of stars. Observations of standard stars are necessary. If mass loss is ruled-out, GC age will be left as the most viable candidate second parameter where this has implications for the formation of the Galaxy.

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