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RR Lyrae Stars in NGC 6388 and NGC 6441: A New Oosterhoff Group?
Barton Pritzl, Horace A. Smith, Marcio Catelan +1
NGC 6388 and NGC 6441 are anomalies among Galactic globular clusters in that they cannot be readily place into either Oosterhoff group I or Oosterhoff group II despite their signif…
Horizontal-Branch Models and the Second-Parameter Effect. III. The Impact of Mass Loss on the Red Giant Branch, and the Case of M5 and Palomar 4/Eridanus
M. Catelan
Deep HST photometry has recently been presented for the outer-halo globular clusters Palomar 4 and Eridanus. The new high-precision color-magnitude diagrams obtained for these glob…
Blue Horizontal--Branch Stars: The "Jump" in Stromgren u, Low Gravities, and Radiative Levitation of Metals
F. Grundahl, M. Catelan, W. B. Landsman +3
We study the ``jump'' in the blue horizontal--branch (BHB) distribution first detected by Grundahl et al. (1998) in the Galactic globular cluster (GC) M13. On the basis of Stromgre…
The Second-Parameter Effect in Metal-Rich Globular Clusters
Allen V. Sweigart
Recent Hubble Space Telescope (HST) observations by Rich et al. (1997) have shown that the metal-rich globular clusters (GCs) NGC 6388 and NGC 6441 exhibit a pronounced 2nd paramet…
Mass Loss on the Red Giant Branch and the Second-Parameter Phenomenon
M. Catelan
The "second-parameter effect" is characterized by the existence of globular clusters (GCs) with similar metallicity [Fe/H] (the "first parameter") but different horizontal-branch (…
Blue horizontal branch stars in metal-rich globular clusters. I. NGC 6388 and NGC 6441
S. Moehler, A. V. Sweigart, M. Catelan
We report the first results of an ongoing spectroscopic survey of blue horizontal branch stars in the metal-rich ([Fe/H] ~ -0.5) globular clusters NGC 6388 and NGC 6441. Based on d…