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A Superwind from Early Post-Red Giant Stars?
Noam Soker, Marcio Catelan, Robert T. Rood +1
We suggest that the gap observed at 20,000 K in the horizontal branches of several Galactic globular clusters is caused by a small amount of extra mass loss which occurs when stars…
Age as the Second Parameter in NGC 288 / NGC 362? I. Turnoff Ages: a Purely Differential Comparison
M. Bellazzini, F. Fusi Pecci, F. R. Ferraro +3
We present deep V,I photometry of the globular clusters NGC 288, NGC 362 and NGC 1851 obtained during a single observational run under strictly homogeneous conditions. We use the b…
Age as the Second Parameter in NGC 288/NGC 362? II. The Horizontal Branch Revisited
M. Catelan, M. Bellazzini, W. B. Landsman +3
We revisit the "second parameter" pair of globular clusters NGC 288/NGC 362 on the basis of theoretical models for red giant branch (RGB) and horizontal branch (HB) stars. The resu…
Variable Stars in the Unusual, Metal-Rich Globular Cluster NGC 6441
Barton J. Pritzl, Horace A. Smith, Marcio Catelan +1
We have undertaken a search for variable stars in the metal-rich globular cluster NGC 6441 using time-series BV photometry. The total number of variables found near NGC 6441 has be…
Horizontal-Branch Models and the Second-Parameter Effect. IV. The Case of M3 and Palomar 3
M. Catelan, F. R. Ferraro, R. T. Rood
We present a detailed analysis of the "second-parameter pair" of globular clusters M3 (NGC 5272) and Palomar 3. Our main results can be summarized as follows: i) The horizontal-bra…
Second Parameter Effects in and between M3 and Palomar 3
M. Catelan, R. T. Rood, F. R. Ferraro
We study the globular clusters M3 and Palomar 3 as a "second parameter (2ndP) pair," showing that: i) M3 has a surprisingly strong *internal* 2ndP; ii) The dispersion in mass on th…