Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.2613t&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #26.13; Bulletin of the American Astronomical Society, V
Other
Scientific paper
We obtained infrared spectroscopy between 1.5552 and 1.5600 microns, of six metal poor red giant stars in NGC 2019, a globular cluster in the LMC, with the Phoenix high-resolution spectrograph at the 8.1-m Gemini South telescope. Current [Fe/H] estimates, based on medium-resolution Ca-triplet spectroscopy and CMD-fitting, disagree by 0.6 dex. In addition, studies of the LMC's globular cluster system performed with the Hubble Space Telescope suggest that the LMC and Milky Way globular clusters have ages within 1 Gyr of each other. Spectral synthesis was carried out in order to calculate accurate oxygen and iron abundances. We used V and I photometry in conjunction with Padova stellar isochrones to calculate the stellar effective temperatures, bolometric corrections, gravities, and luminosities. We were not able to independently measure the microturbulent velocities, and so they were estimated using stellar luminosities and gravities. Preliminary analysis shows a mean [O/Fe] of 0.35 ± .10 for NGC 2019, which is similar to values found in old globular clusters of the Milky Way.
Blum Ben
Olsen Knut A.
Tucker Bradley E.
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