Other
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..581f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 15, 1985, p. 581-585.
Other
12
Abundance, Globular Clusters, Infrared Spectra, Red Giant Stars, Stellar Spectrophotometry, Variable Stars, Carbon Monoxide, Color-Magnitude Diagram, Helium, Stellar Luminosity
Scientific paper
New infrared photometry is presented for 15 red giants, including five variables, in the metal-rich globular cluster NGC 6712. From infrared color-magnitude diagrams a value of [Fe/H]IR = -0.92 is derived, identical to that for NGC 6171 and in close agreement with optical determinations of the abundance. Nonetheless, the CO indices of the NGC 6712 giants are quite strong - about 0.04 mag greater than for stars in 47 Tucanae. The long-period variable V7 is the only star in the cluster with a luminosity greater than that predicted for the location of core He flash. Two variables - V2 and V8 - are identified as being members of a class of variables characterized by blue colors and high temperatures relative to other giants of the same luminosity.
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