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CN Bimodality at Low Metallicity: The Globular Cluster M53
Sarah L. Martell, Graeme H. Smith, Michael M. Briley
We present low resolution UV-blue spectroscopic observations of red giant stars in the globular cluster M53 ([Fe/H]=-1.84), obtained to study primordial abundance variations and de…
The Unusual Spectrum of Comet 96P/Machholz
Laura E. Langland-Shula, Graeme H. Smith
We report spectra from 3000-5900 A for comet 96P/Machholz, obtained on 2007 Apr 27 UT with the 3-m Shane telescope at Lick Observatory. The spectra are extremely carbon poor, and s…
Integrated Colours of Milky Way Globular Clusters and Horizontal Branch Morphology
Graeme H. Smith, Jay Strader
Broadband colours are often used as metallicity proxies in the study of extragalactic globular clusters. A common concern is the effect of variations in horizontal branch (HB) morp…